Methods for preparing a wellbore casing for stimulation operations comprise the steps of cementing a wellbore casing in a wellbore, the wellbore casing having a downhole tool comprising a valve and an apparatus for restricting fluid flow through the valve, such as a ball seat, disposed above the valve. Actuation of the valve opens the valve to establish fluid communication between the wellbore casing and the formation. A plug element is disposed on a seat of the ball seat and a casing pressure test is performed. The plug element then dissolves or disintegrates over time increasing fluid communication between the wellbore casing and the formation, thereby preparing the wellbore casing for stimulation operations without additional wellbore intervention after the casing pressure test. In certain embodiments, during or after dissolution of the plug element, clean-out of the bore of the valve is performed by the plug element.

Patent
   RE46793
Priority
Feb 03 2012
Filed
Nov 09 2015
Issued
Apr 17 2018
Expiry
Feb 03 2032
Assg.orig
Entity
Large
0
205
currently ok
0. 14. A method of stimulating a wellbore environment, the method comprising:
opening a valve disposed below a fluid restriction apparatus of a cemented wellbore casing within a wellbore, the valve in direct contact with the fluid restriction apparatus, the fluid restriction apparatus comprising a tubular member having a seat disposed within a bore of the tubular member and a plug element for landing on the seat, wherein opening the valve places the wellbore casing in fluid communication with a wellbore environment;
landing the plug element on the seat to restrict fluid communication between the wellbore casing and the wellbore environment;
forcing the plug element through the seat after dissolving a portion of the plug element and thereby causing an increase in fluid communication between the wellbore casing and the wellbore environment; and
performing a stimulation operation in the wellbore environment.
1. A method of stimulating a wellbore environment, the method comprising:
(a) cementing a wellbore casing within a wellbore, the wellbore casing comprising a valve disposed below a fluid restriction apparatus, the valve in direct contact with the fluid restriction apparatus, the fluid restriction apparatus comprising a tubular member having a seat disposed within a bore of the tubular member and a plug element for landing on the seat;
(b) opening the valve to place the wellbore casing in fluid communication with a wellbore environment;
(c) landing the plug element on the seat to restrict fluid communication between the wellbore casing and the wellbore environment;
(d) without additional wellbore intervention, removing a portion of the plug element dissolving a portion of the plug element before forcing the plug element through the seat and thereby causing an increase in fluid communication between the wellbore casing and the wellbore environment; and
(e) performing a stimulation operation in the wellbore environment.
8. A method of stimulating a wellbore environment, the method comprising:
(a) cementing a wellbore casing within a wellbore, the wellbore casing comprising a single downhole tool including a valve and a fluid restriction apparatus, the valve disposed below the fluid restriction apparatus, the fluid restriction apparatus comprising a tubular member having a seat disposed within a bore of the tubular member and a plug element for landing on the seat, the plug element comprising a dissolvable material;
(b) opening the valve to place the wellbore casing in fluid communication with a wellbore environment;
(c) landing the plug element on the seat to restrict fluid communication between the wellbore casing and the wellbore environment;
(d) dissolving a portion of the plug element before forcing the plug element through the seat, and thereby causing an increase in fluid communication between the wellbore casing and the wellbore environment; and
(e) performing a stimulation operation in the wellbore environment.
2. The method of claim 1, wherein during step (d), the plug element is forced down through the seat and through a bore of the valve causing debris to be removed from the bore of the valve.
3. The method of claim 2, wherein during removal of the portion of the plug element, the plug element is dissolved from a first shape to a second shape, the second shape being defined by a non-dissolvable material.
4. The method of claim 3, wherein the second shape comprises a wiper member.
5. The method of claim 1, wherein the valve is opened during step (b) by fluid pressure actuating the valve.
6. The method of claim 1, wherein additional wellbore intervention includes step (d) is performed without using tubing conveyed perforations.
7. The method of claim 1, further comprising performing a pressure test of the wellbore casing.
9. The method of claim 8, wherein during step (d), the plug element is forced down through the seat and through a bore of the valve causing debris to be removed from the bore of the valve.
10. The method of claim 9, wherein during step (d), the plug element is dissolved from a first shape to a second shape, the second shape being defined by a non-dissolvable material.
11. The method of claim 10, wherein the second shape comprises a wiper member.
12. The method of claim 8, wherein the valve is opened during step (b) by fluid pressure actuating the valve.
13. The method of claim 8, further comprising performing a pressure test of the wellbore casing.
0. 15. The method of claim 14, wherein during removal of the portion of the plug element, the plug element is forced through a bore of the valve causing debris to be removed from the bore of the valve.
0. 16. The method of claim 15, wherein the plug element is dissolved from a first shape to a second shape, the second shape being defined by a non-dissolvable material.
0. 17. The method of claim 16, wherein the second shape comprises a wiper member.
0. 18. The method of claim 14, wherein the valve is opened by fluid pressure actuating the valve.
0. 19. The method of claim 14, wherein causing an increase in fluid communication between the wellbore casing and the wellbore environment is performed without using tubing conveyed perforations.
0. 20. The method of claim 14, further comprising performing a pressure test of the wellbore casing.

1. Field of Invention

The present invention is directed to methods of preparing a cased wellbore for stimulation operations and, in particular, to interventionless methods for preparing the cased wellbore for stimulation operations using pressure actuated sleeves and apparatuses for temporarily restricting fluid flow through the wellbore casing to prepare the wellbore casing for stimulation operations as opposed to using additional wellbore intervention methods such as tubing conveyed perforation.

2. Description of Art

Ball seats are generally known in the art. For example, typical ball seats have a bore or passageway that is restricted by a seat. The ball or plug element is disposed on the seat, preventing or restricting fluid from flowing through the bore of the ball seat and, thus, isolating the tubing or conduit section in which the ball seat is disposed. As force is applied to the ball or plug element, the conduit can be pressurized for tubing testing or tool actuation or manipulation, such as in setting a packer. Ball seats are used in cased hole completions, liner hangers, flow diverters, fracturing systems, acid-stimulation systems, and flow control equipment and other systems.

Although the terms “ball seat” and “ball” are used herein, it is to be understood that a drop plug or other shaped plugging device or element may be used with the “ball seats” disclosed and discussed herein. For simplicity it is to be understood that the terms “ball” and “plug element” include and encompass all shapes and sizes of plugs, balls, darts, or drop plugs unless the specific shape or design of the “ball” is expressly discussed.

Stimulating, which as used herein includes fracturing or “fracing,” a wellbore using stimulation systems or tools also are known in the art. In general, stimulating systems or tools are used in oil and gas wells for completing and increasing the production rate from the well. In deviated wellbores, particularly those having longer lengths, fluid, such as acid or fracturing fluids, can be expected to be introduced into the linear, or horizontal, end portion of the well to stimulate the production zone to open up production fissures and pores therethrough. For example, hydraulic fracturing is a method of using pump rate and hydraulic pressure created by fracturing fluids to fracture or crack a subterranean formation, or the wellbore environment.

Prior to stimulating a wellbore, a stimulation tool is cemented into the wellbore. Thereafter, a pressure test of the wellbore casing containing the stimulation tool is performed. To perform this step, the pathway through the stimulation tool must be closed off. After the casing test establishes the integrity of the wellbore casing, fluid communication of the pathway through the stimulation tool is reestablished so that the stimulation fluid can be pumped down through the stimulation tool and into the formation. Currently, the steps involved in reestablishing fluid flow through the stimulation tool require additional wellbore intervention such as by using tubing conveyed perforation.

Broadly, the methods for preparing a wellbore for stimulation operations disclosed herein comprise the steps of cementing into a wellbore casing a downhole tool comprising a valve having an apparatus for restricting fluid flow through the valve, such as a ball seat, disposed above the valve. The valve is actuated to its opened position to establish fluid flow between the casing bore and the formation or wellbore environment. Thereafter, a plug element is disposed on the seat of the ball seat and a casing pressure test is performed. The plug element then dissolves or disintegrates over time thereby increasing fluid communication between the formation and the wellbore casing through the valve, thereby placing the wellbore casing in condition for stimulation operations without additional wellbore intervention after the casing test.

In one specific embodiment, the plug element also functions as a wiper member to facilitate additional clean-up of the bore of the valve after the pressure test has been performed. The plug element dissolves into a predetermined shape that, when pushed through the seat and the bore of the valve, the plug element wipes away debris within the bore of the valve.

FIG. 1 is a cross-sectional view of one specific embodiment of the downhole tool disclosed herein showing an exemplary valve in its closed position.

FIG. 2 is a cross-sectional view of the downhole tool of FIG. 1 showing the valve in one of its opened positions.

FIG. 3 is a cross-sectional view of the downhole tool of FIG. 1 showing a plug element landed on a seat above the valve so that a casing test can be performed.

FIG. 4 is a cross-sectional view of the downhole tool of FIG. 1 showing the downhole tool in position for stimulation operations after the pressure test has been performed and the plug element shown in FIG. 3 dissolved.

FIG. 5 is a cross-sectional view of a specific embodiment of a plug element as disclosed herein.

FIG. 6 is a side view of the wiper member shown in FIG. 5.

While the invention will be described in connection with the preferred embodiments, it will be understood that it is not intended to limit the invention to that embodiment. On the contrary, it is intended to cover all alternatives, modifications, and equivalents, as may be included within the spirit and scope of the invention as defined by the appended claims.

Referring now to FIGS. 1-4, in one specific embodiment, downhole tool 30 comprises valve 40 and bore restriction apparatus 70, shown as a ball seat in FIGS. 1-4. FIG. 1 shows valve 40 in a closed position, and FIGS. 2-4 show valve 40 actuated to an open position.

Valve 40 includes lower ported housing 44 having fluid communication ports 46, and upper body 48. Pressure integrity of valve 40 is maintained by body seals 41. Body set screws 47 keep the body connection threads 43 from backing out during installation. Captured between lower ported housing 44 and upper body 48 is inner shifting sleeve 50. Inner shifting sleeve 50 has several diameters that create piston areas that generate shifting forces to open valve 40. Port isolation seals 45 located on the lower end of inner shifting sleeve 50 and lower internal bore piston seals 65 above fluid communication ports 46 both act to isolate the inside of valve 40 during and after cementation. Port isolation seals 45 and lower internal bore piston seals 65 operate within their respective polished bores 55, 57 within lower ported housing 44. The larger intermediate internal bore piston seals 52 are used to drive up inner shifting sleeve 50 along the upper internal polished bore 53 within lower ported housing 44 after burst disc 42 is ruptured.

Upper external rod piston seals 59 located within upper body 48 act to prevent cement from entering upper atmospheric chamber 62 and wipe the outside diameter of upper sleeve polished bore 61 during opening of valve 40. Inner shifting sleeve 50 also has shoulder 54 that shears shear screw 56 during the opening shift of inner shifting sleeve 50. External sleeve lock ring retention groove 63 is located between internal bore seals 52 and upper sleeve polished bore 61 diameter. Lock ring retention groove 63 accepts sleeve lock ring 69 that is retained by lock ring retainer 67 after valve 40 has been fully opened. Thus, sleeve lock ring 69 prevents inner shifting sleeve 50 from closing after valve 40 has been opened (FIGS. 2-4).

Located between lower internal bore piston seals 65 and intermediate bore piston seals 52 is lower atmospheric chamber 58 which contains air that can be independently tested through lower pressure test port 60. Located between intermediate internal bore piston seals 52 and upper external rod piston seals 59 is upper atmospheric chamber 62 which also contains air that can be independently tested through upper pressure testing port 64. A rupture or burst disc 42 is held in place within a port located on the outside of inner shifting sleeve 50 by load ring 66 and load nut 68. Burst disc load nut 68 is sized to allow significant torque and load to be transferred into burst disc 42 prior to installation of inner shifting sleeve 50 within valve 40.

Those skilled in the art will appreciate that the use of the rupture disc for piston access is simply the preferred way and generally more accurate than relying exclusively on shearing a shear pin. A pressure regulation valve can also be used for such selective access as well as a chemically responsive barrier that goes away in the presence of a predetermined substance or energy field, temperature downhole or other well condition for example, to move the sleeve. Burst or rupture discs 42 also can be replaced by any other pressure control plug known in the art such as those disclosed and taught in U.S. patent application Ser. No. 13/286,775, filed Nov. 1, 2011, entitled “Frangible Pressure Control Plug, Actuatable Tool, Including Plug, and Method Thereof” which is hereby incorporated by reference in its entirety.

After burst disc 42 is ruptured, lower chamber 58 is under absolute downhole pressure so wall flexure at that location is minimized. Even before burst disc 42 breaks, the size of lower chamber 58 is sufficiently small to avoid sleeve wall flexing in that region. The use of a large boss to support intermediate internal bore piston seals 52 also strengthens inner shifting sleeve 50 immediately below upper chamber 62, thus at least reducing flexing or bending that could put inner shifting sleeve 50 in a bind before it is fully shifted. The slightly larger dimension of external rod piston seals 59 as compared to port isolation seals 45 that hold inner shifting sleeve 50 closed initially also allows a greater wall thickness for inner shifting sleeve 50 near the upper chamber 62 to further at least reducing flexing or bending to allow inner shifting sleeve 50 to fully shift without getting into a bind.

The intermediate internal bore piston seals 52 can be integral to inner shifting sleeve 50 or a separate structure. Upper chamber 62 has an initial pressure of atmospheric or a predetermined value less than the anticipated hydrostatic pressure within inner shifting sleeve 50. The volume of upper chamber 62 decreases and its internal pressure rises as inner shifting sleeve 50 moves to open ports 46.

Ball seat 70 is secured to the upper end of valve 40 through any known device or method in the art, such as a threaded connection. Ball seat 70 comprises upper end 71, lower end 72 which is secured to valve 40, and inner wall surface 73 defining bore 74. Seat 75 is disposed along inner wall surface 73 for receiving a plug element such as ball 80 shown in FIG. 3.

In operation, downhole tool 30 is connected to casing at its upper and lower ends and run in open-hole cementable completions just above float equipment. After being disposed within the wellbore at the desired location, downhole tool 30 is cemented into place within the well.

After cementation, a clean-out operation is performed to remove debris from the flow path through valve 40. The clean-out operation can be performed by pumping fluid through downhole tool 30 to clean up any debris remaining from the cementing operations. In addition, or alternatively, a wiper plug can be transported down the bore of the casing, past seat 75 to and through the bore of valve 40 to wipe away and debris, including residual cement.

After the cement has set on the outside of valve 40, it is ready to be opened with a combination of high hydrostatic and applied pressure. Upon reaching the critical pressure, burst disc 42 is fractured and opens lower atmospheric chamber 58 to the absolute downhole pressure. This pressure acts on the piston area created by lower internal bore piston seals 65 and the larger internal bore piston seals 52 and drives inner shifting sleeve 50 upward compressing the air within upper atmospheric chamber 62 and opening fluid communication ports 46 on the ported housing 44. Thus, the volume of upper chamber 62 decreases and its internal pressure rises as inner shifting sleeve 50 moves to open ports 46.

After inner shifting sleeve 50 is completely shifted and in contact with the downward facing shoulder on lock ring retainer 67, sleeve lock ring 69 falls into sleeve lock retention groove 63 on inner shifting sleeve 50 preventing valve 40 from subsequently closing.

After burst disc 42 is fractured, absolute downhole pressure acts on piston seals 52 and piston seals 65 continuously pushing sleeve 50 upward acting as a redundant locking feature preventing valve 40 from subsequently closing.

Upon opening valve 40, fluid communication between the bore of downhole tool 30 and, thus, the wellbore casing string, and the wellbore formation or wellbore environment is established. Thereafter, a pressure test of the casing can be performed. To do so, plug element 80 is transported down the casing string and landed on seat 75 of ball seat 70 (FIG. 3). Afterwards, a pressure test is performed. Presuming the pressure test is successful, then the wellbore is capable of having stimulation operations performed. However, the plug element 80 remains on seat 75. Plug element 80 is removed from seat 75 over time due to the dissolution of at least a portion of plug element 80. After plug element 80 sufficiently dissolves such that fluid pressure acting downward on plug element 80 can push plug element 80 through seat 75 and through the bore of valve 40, fluid communication between the casing string and the formation is increased so that stimulation operations can be performed. Thus, after landing plug element 80 on seat 75 and the pressure test is performed, no additional wellbore intervention is required to place the casing string in condition for stimulation operations.

In certain embodiments, plug element 80 completely dissolves. In other embodiments, plug element 80 partially dissolves before passing through seat 75 and through the bore of valve 40. In still other embodiments, a portion of plug element 80 is formed from a material that is not dissolvable. Dissolution of a portion, or all of plug element 80, can be accomplished by having plug element 80 formed at least in part by a dissolvable material. “Dissolvable” means that the material is capable of dissolution in a fluid or solvent disposed within the wellbore casing. “Dissolvable” is understood to encompass the terms degradable and disintegrable. Likewise, the terms “dissolved” and “dissolution” also are interpreted to include “degraded” and “disintegrated,” and “degradation” and “disintegration,” respectively. The dissolvable material may be any material known to persons of ordinary skill in the art that can be dissolved, degraded, or disintegrated over an amount of time by a temperature or fluid such as water-based drilling fluids, hydrocarbon-based drilling fluids, or natural gas, and that can be calibrated such that the amount of time necessary for the dissolvable material to dissolve is known or easily determinable without undue experimentation. Suitable dissolvable materials include controlled electrolytic metallic nano-structured materials such as those disclosed in U.S. patent application Ser. No. 12/633,682, filed Dec. 8, 2009 (U.S. Patent Publication No. 2011/0132143), U.S. patent application Ser. No. 12/633,686, filed Dec. 8, 2009 (U.S. Patent Publication No. 2011/0135953), U.S. patent application Ser. No. 12/633,678, filed Dec. 8, 2009 (U.S. Patent Publication No. 2011/0136707), U.S. patent application Ser. No. 12/633,683, filed Dec. 8, 2009 (U.S. Patent Publication No. 2011/0132612), U.S. patent application Ser. No. 12/633,668, filed Dec. 8, 2009 (U.S. Patent Publication No. 2011/0132620), U.S. patent application Ser. No. 12/633,677, filed Dec. 8, 2009 (U.S. Patent Publication No. 2011/0132621), and U.S. patent application Ser. No. 12/633,662, filed Dec. 8, 2009 (U.S. Patent Publication No. 2011/0132619), all of which are hereby incorporated by reference in their entirety.

Additional suitable dissolvable materials include polymers and biodegradable polymers, for example, polyvinyl-alcohol based polymers such as the polymer HYDROCENE™ available from Idroplax, S.r.l. located in Altopascia, Italy, polylactide (“PLA”) polymer 4060D from Nature-Works™, a division of Cargill Dow LLC; TLF-6267 polyglycolic acid (“PGA”) from DuPont Specialty Chemicals; polycaprolactams and mixtures of PLA and PGA; solid acids, such as sulfamic acid, trichloroacetic acid, and citric acid, held together with a wax or other suitable binder material; polyethylene homopolymers and paraffin waxes; polyalkylene oxides, such as polyethylene oxides, and polyalkylene glycols, such as polyethylene glycols. These polymers may be preferred in water-based drilling fluids because they are slowly soluble in water.

In calibrating the rate of dissolution of dissolvable material, generally the rate is dependent on the molecular weight of the polymers. Acceptable dissolution rates can be achieved with a molecular weight range of 100,000 to 7,000,000. Thus, dissolution rates for a temperature range of 50° C. to 250° C. can be designed with the appropriate molecular weight or mixture of molecular weights.

Referring now to FIGS. 5-6, in an alternative embodiment, plug element 180 comprises an initial shape (FIG. 5) that is capable of landing on seat 75 to restrict fluid flow through seat 75, and a new or second shape (FIG. 6) that is sufficient to act as a wiper member as it passes through seat 75 and/or through the bore of valve 40 and/or the bore of inner shifting sleeve 50 upon partial or complete dissolution of the dissolvable material 181 of plug element 180. In this embodiment, plug element 180 includes wiper member 190 encapsulated by dissolvable material 181. Wiper member 190 can be formed out of a material 191 that can be a non-dissolvable material or a second dissolvable material that dissolves at a slower rate compared to dissolvable material 181. Upon sufficient dissolution of dissolvable material 181, wiper member 190 is capable of being pushed through seat 75 and/or through the bore of valve 40 and/or the bore of inner shifting sleeve 50. In so doing, wiper member 190 wipes or cleans away debris disposed along these surfaces. Thus, a mechanical clean-out of the valve can be performed after the pressure test without additional wellbore intervention.

As discussed above, plug elements 80, 180 can be formed completely out of one or more dissolvable materials or plug elements 80, 180 can be formed partially out of one or more dissolvable materials. In the former embodiment, plug elements 80, 180 will completely dissolve and fluid flow through valve 40 in the wellbore environment will be increased. In the latter embodiment, upon dissolution, plug elements 80, 180 can have a new or second shape that is different from the initial shape of plug element 80 that provided restriction of fluid flow through seat 75. The new shape of plug element 80 can either fall through valve 40 as debris, or it can facilitate wiping or cleaning of the bore of valve 40 by the remaining portion(s) of plug elements 80, 180. Thus, plug elements 80, 180 can remove debris disposed within the valve bore as fluid communication between the wellbore casing and the wellbore environment is increased. In these embodiments, both increase of fluid communication between the wellbore casing and the wellbore environment after removal of plug elements 80, 180, and mechanical clean-out of the valve bore, occur without further wellbore intervention.

It is to be understood that the invention is not limited to the exact details of construction, operation, exact materials, or embodiments shown and described, as modifications and equivalents will be apparent to one skilled in the art. For example, the wiper member can have any shape desired or necessary to pass through the valve to remove debris disposed within the bore of the valve and/or inner shifting sleeve. In addition, the wiper can be formed out of a non-dissolvable material or another dissolvable material. Moreover, the valve is not required to have the structures disclosed herein, nor is the valve required to operate as disclosed herein. Further, the ball seats disclosed herein can be modified as desired or necessary to restrict fluid flow through the wellbore casing. Additionally, dissolvable materials not disclosed herein can be used in place of those that are disclosed herein. Accordingly, the invention is therefore to be limited only by the scope of the appended claims.

Johnson, Charles C., Kellner, Justin C., Madero, Paul

Patent Priority Assignee Title
Patent Priority Assignee Title
1883071,
2117534,
2117539,
2769454,
2822757,
2829719,
2857972,
2973006,
3007527,
3013612,
3043903,
3090442,
3211232,
3220481,
3220491,
3503445,
3510103,
3566964,
3667505,
3727635,
3776258,
3901315,
4114694, May 16 1977 HUGHES TOOL COMPANY A CORP OF DE No-shock pressure plug apparatus
4160478, Apr 25 1977 Halliburton Company Well tools
4194566, Oct 26 1978 Union Oil Company of California Method of increasing the permeability of subterranean reservoirs
4291722, Nov 05 1979 Halliburton Company Drill string safety and kill valve
4292988, Jun 06 1979 HUGHES TOOL COMPANY A CORP OF DE Soft shock pressure plug
4311163, Feb 02 1979 Commissariat a l'Energie Atomique Disassemblable device for fitting a device between the opposite ends of two pipes
4314608, Jun 12 1980 RICHARDSON, CHARLES Method and apparatus for well treating
4374543, Jun 12 1980 RICHARDSON, CHARLES Apparatus for well treating
4390065, Jun 12 1980 RICHARDSON, CHARLES Apparatus for well treating
4448216, Mar 15 1982 Halliburton Company Subsurface safety valve
4478279, Oct 12 1982 Hydril Company Retrievable inside blowout preventer valve apparatus
4510994, Apr 06 1984 Camco, Incorporated Pump out sub
4520870, Dec 27 1983 Camco, Incorporated Well flow control device
4537255, Jun 22 1983 Halliburton Company Back-off tool
4537383, Oct 02 1984 Halliburton Company Valve
4576234, Sep 17 1982 Schlumberger Technology Corporation Full bore sampler valve
4583593, Feb 20 1985 Halliburton Company Hydraulically activated liner setting device
4669538, Jan 16 1986 Halliburton Company Double-grip thermal expansion screen hanger and running tool
4729432, Apr 29 1987 HALLIBURTON COMPANY, A CORP OF DE Activation mechanism for differential fill floating equipment
4823882, Jun 08 1988 TAM INTERNATIONAL, INC.; TAM INTERNATIONAL, A TEXAS CORP Multiple-set packer and method
4826135, Feb 12 1987 Scandot System AB Arrangement for a valve assembly for a liquid jet printer
4828037, May 09 1988 SMITH INTERNATIONAL, INC A DELAWARE CORPORATION Liner hanger with retrievable ball valve seat
4848691, Dec 25 1986 Tokyo Automatic Machinery Works, Ltd.; Japan Tobacco Inc. Apparatus for splicing a replacement web to a moving web
4862966, May 16 1988 SMITH INTERNATIONAL, INC A DELAWARE CORPORATION Liner hanger with collapsible ball valve seat
4893678, Jun 08 1988 Tam International Multiple-set downhole tool and method
4915172, Mar 23 1988 Baker Hughes Incorporated Method for completing a non-vertical portion of a subterranean well bore
4949788, Nov 08 1989 HALLIBURTON COMPANY, A CORP OF DE Well completions using casing valves
4991654, Nov 08 1989 HALLIBURTON COMPANY, A CORP OF DE Casing valve
5056599, Apr 24 1989 Walter B., Comeaux, III Method for treatment of wells
5146992, Aug 08 1991 Baker Hughes Incorporated Pump-through pressure seat for use in a wellbore
5156220, Aug 27 1990 Baker Hughes Incorporated Well tool with sealing means
5244044, Jun 08 1992 Halliburton Company Catcher sub
5246203, Jun 29 1992 MCKNIGHT, DEVEREUX J Oilfield valve
5297580, Feb 03 1993 High pressure ball and seat valve with soft seal
5309995, Mar 05 1991 ExxonMobil Upstream Research Company Well treatment using ball sealers
5316084, Aug 27 1990 Baker Hughes Incorporated Well tool with sealing means
5333689, Feb 26 1993 Mobil Oil Corporation Gravel packing of wells with fluid-loss control
5335727, Nov 04 1992 Atlantic Richfield Company Fluid loss control system for gravel pack assembly
5413180, Aug 12 1991 HALLIBURTON COMAPNY One trip backwash/sand control system with extendable washpipe isolation
5479986, May 02 1994 Halliburton Company Temporary plug system
5501276, Sep 15 1994 Halliburton Company Drilling fluid and filter cake removal methods and compositions
5558153, Oct 20 1994 Baker Hughes Incorporated Method & apparatus for actuating a downhole tool
5577560, Nov 25 1991 Baker Hughes Incorporated Fluid-actuated wellbore tool system
5607017, Jul 03 1995 Halliburton Energy Services, Inc Dissolvable well plug
5623993, Aug 07 1992 Baker Hughes Incorporated Method and apparatus for sealing and transfering force in a wellbore
5685372, May 02 1994 Halliburton Company Temporary plug system
5704393, Jun 02 1995 Halliburton Company Coiled tubing apparatus
5709269, Dec 14 1994 Dissolvable grip or seal arrangement
5762142, Jun 02 1995 Halliburton Company Coiled tubing apparatus
5765641, Nov 22 1995 Halliburton Company Bidirectional disappearing plug
5813483, Dec 16 1996 Safety device for use on drilling rigs and process of running large diameter pipe into a well
5960881, Apr 22 1997 Allamon Interests Downhole surge pressure reduction system and method of use
5992289, Feb 17 1998 Halliburton Energy Services, Inc Firing head with metered delay
6003607, Sep 12 1996 Halliburton Company Wellbore equipment positioning apparatus and associated methods of completing wells
6026903, May 02 1994 Halliburton Energy Services, Inc. Bidirectional disappearing plug
6050340, Mar 27 1998 WEATHERFORD TECHNOLOGY HOLDINGS, LLC Downhole pump installation/removal system and method
6053248, Sep 12 1996 Halliburton Energy Services, Inc. Methods of completing wells utilizing wellbore equipment positioning apparatus
6053250, Feb 22 1996 Halliburton Energy Services, Inc. Gravel pack apparatus
6062310, Mar 10 1997 OWEN OIL TOOLS, INC Full bore gun system
6076600, Feb 27 1998 Halliburton Energy Services, Inc Plug apparatus having a dispersible plug member and a fluid barrier
6079496, Dec 04 1997 Baker Hughes Incorporated Reduced-shock landing collar
6102060, Feb 04 1997 Specialised Petroleum Services Group Limited Detachable locking device for a control valve and method
6155350, May 03 1999 Baker Hughes Incorporated Ball seat with controlled releasing pressure and method setting a downhole tool ball seat with controlled releasing pressure and method setting a downholed tool
6161622, Nov 02 1998 Halliburton Energy Services, Inc Remote actuated plug method
6189618, Apr 20 1998 WEATHERFORD TECHNOLOGY HOLDINGS, LLC Wellbore wash nozzle system
6220350, Dec 01 1998 Halliburton Energy Services, Inc High strength water soluble plug
6279656, Nov 03 1999 National City Bank Downhole chemical delivery system for oil and gas wells
6289991, Feb 21 1996 Baker Hughes Incorporated Downhole apparatus
6293517, Feb 28 2000 John D., McKnight; Brent H., McKnight Ball valve having convex seat
6382234, Oct 08 1996 Weatherford/Lamb, Inc. One shot valve for operating down-hole well working and sub-sea devices and tools
6397950, Nov 21 1997 Halliburton Energy Services, Inc Apparatus and method for removing a frangible rupture disc or other frangible device from a wellbore casing
6431276, Nov 02 1998 Halliburton Energy Services, Inc. Remote actuated plug apparatus
6457517, Jan 29 2001 Baker Hughes Incorporated Composite landing collar for cementing operation
6467546, Feb 04 2000 FRANK S INTERNATIONAL, LLC Drop ball sub and system of use
6530574, Oct 06 2000 Method and apparatus for expansion sealing concentric tubular structures
6547007, Apr 17 2001 Halliburton Energy Services, Inc PDF valve
6634428, May 03 2001 BAKER HUGHES OILFIELD OPERATIONS LLC Delayed opening ball seat
6666273, May 10 2002 Weatherford Lamb, Inc Valve assembly for use in a wellbore
6668933, Oct 23 2000 ABB Vetco Gray Inc. Ball valve seat and support
6708946, Sep 15 1998 Expro North Sea Limited Ball valve
6763892, Sep 24 2001 Sliding sleeve valve and method for assembly
6779600, Jul 27 2001 Baker Hughes Incorporated Labyrinth lock seal for hydrostatically set packer
6834726, May 29 2002 Wells Fargo Bank, National Association Method and apparatus to reduce downhole surge pressure using hydrostatic valve
6848511, Dec 06 2002 WEATHERFORD TECHNOLOGY HOLDINGS, LLC Plug and ball seat assembly
6866100, Aug 23 2002 Wells Fargo Bank, National Association Mechanically opened ball seat and expandable ball seat
6896049, Jul 07 2000 Zeroth Technology Limited Deformable member
6926086, May 09 2003 Halliburton Energy Services, Inc Method for removing a tool from a well
6966368, Jun 24 2003 BAKER HUGHES OILFIELD OPERATIONS LLC Plug and expel flow control device
7021389, Feb 24 2003 BAKER HUGHES, A GE COMPANY, LLC Bi-directional ball seat system and method
7093664, Mar 18 2004 HALLIBURTON EENRGY SERVICES, INC One-time use composite tool formed of fibers and a biodegradable resin
7150326, Feb 24 2003 Baker Hughes Incorporated Bi-directional ball seat system and method
7311118, Mar 30 2004 Parker Intangibles LLC Floating ball check valve
7316274, Mar 05 2004 Baker Hughes Incorporated One trip perforating, cementing, and sand management apparatus and method
7322417, Dec 14 2004 Schlumberger Technology Corporation Technique and apparatus for completing multiple zones
7325617, Mar 24 2006 BAKER HUGHES HOLDINGS LLC Frac system without intervention
7350582, Dec 21 2004 Wells Fargo Bank, National Association Wellbore tool with disintegratable components and method of controlling flow
7353879, Mar 18 2004 Halliburton Energy Services, Inc Biodegradable downhole tools
7395856, Mar 24 2006 BAKER HUGHES HOLDINGS LLC Disappearing plug
7416029, Apr 01 2003 SCHLUMBERGER OILFIELD UK LIMITED Downhole tool
7464764, Sep 18 2006 BAKER HUGHES HOLDINGS LLC Retractable ball seat having a time delay material
7469744, Mar 09 2007 BAKER HUGHES HOLDINGS LLC Deformable ball seat and method
7503392, Aug 13 2007 BAKER HUGHES HOLDINGS LLC Deformable ball seat
7625846, May 15 2003 ENERPOL, LLC Application of degradable polymers in well fluids
7628210, Aug 13 2007 BAKER HUGHES HOLDINGS LLC Ball seat having ball support member
7640991, Sep 20 2005 Schlumberger Technology Corporation Downhole tool actuation apparatus and method
7644772, Aug 13 2007 BAKER HUGHES HOLDINGS LLC Ball seat having segmented arcuate ball support member
7866402, Oct 11 2007 Halliburton Energy Services, Inc. Circulation control valve and associated method
8276675, Aug 11 2009 Halliburton Energy Services Inc. System and method for servicing a wellbore
8657015, May 26 2010 Schlumberger Technology Corporation Intelligent completion system for extended reach drilling wells
20020162661,
20030037921,
20030141064,
20030168214,
20040108109,
20050061372,
20050092363,
20050092484,
20050126638,
20050161224,
20050205264,
20050205265,
20050205266,
20050281968,
20060021748,
20060124312,
20060131031,
20060175092,
20060207764,
20060213670,
20060243455,
20060266518,
20070023087,
20070029080,
20070062706,
20070074873,
20070169935,
20070181224,
20070251698,
20070295507,
20080017375,
20080066923,
20080066924,
20080217025,
20090025927,
20090044946,
20090044948,
20090044949,
20090044955,
20090107684,
20100032151,
20100132954,
20100252280,
20110017458,
20110132143,
20110132612,
20110132619,
20110132620,
20110132621,
20110135530,
20110135953,
20110136707,
20110187062,
20110192607,
20110247833,
20110315390,
20120012771,
20120048556,
20120181032,
20120199341,
20120227980,
20120261115,
20120261140,
20120305236,
20120312557,
20130025872,
20130105175,
20130140479,
20130146144,
20130175052,
CA2460712,
EP518371,
WO2068793,
WO3006787,
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Mar 07 2012KELLNER, JUSTIN C Baker Hughes IncorporatedASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0369940288 pdf
Mar 13 2012JOHNSON, CHARLES C Baker Hughes IncorporatedASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0369940288 pdf
Mar 29 2012MADERO, PAULBaker Hughes IncorporatedASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0369940288 pdf
Nov 09 2015BAKER HUGHES, A GE COMPANY, LLC(assignment on the face of the patent)
Jul 03 2017Baker Hughes IncorporatedBAKER HUGHES, A GE COMPANY, LLCCHANGE OF NAME SEE DOCUMENT FOR DETAILS 0449350099 pdf
Apr 13 2020BAKER HUGHES, A GE COMPANY, LLCBAKER HUGHES HOLDINGS LLCCHANGE OF NAME SEE DOCUMENT FOR DETAILS 0594980728 pdf
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