SYSTEM FOR COMPLETING WATER INJECTOR WELLS
A system for completing water injection wells includes an injector well completion system. In an embodiment, an injector well completion system in a formation has a casing string disposed in a wellbore having an annulus. The casing string includes a casing and a perforating gun. The casing string is run into the wellbore and cemented to provide a cemented casing string having the perforating gun. The tubing is run into the wellbore inside the cemented casing string.
This application is a non-provisional of U.S. Application Ser. No. 60/972,886 filed on Sep. 17, 2007, which is incorporated by reference herein in its entirety.
BACKGROUNDWater injector wells involve injecting water into the formation. The water may be injected in the formation for purposes such as voidage replacement to maintain pressure, constrain gas cap, optimize well count, and maximize oil rate acceleration through producers. Various completion techniques have been developed in the industry for completion of water injector wells. For instance, conventional completion techniques include use of frac packs, open hole gravel packs, and stand alone screen completions. Drawbacks to conventional completion techniques include that large inner diameters may not be available, which may be required for completing wells with flow control valves used for proper water injection volume distribution in various zones. Drawbacks related to frac packs include their complexity and high expense. In addition, drawbacks related to open hole gravel packs include the typical high expense in achieving high differential pressure zonal isolation, which is often needed for intelligent completion. Drawbacks to stand along screen completions may include insufficient sand control completions.
Compliance and non-compliance expandable screens have been developed to overcome problems with conventional completion techniques. However, drawbacks to compliance and non-compliance expandable screens may include un-reliability of the expandable screens over long periods. Further drawbacks include that the collapse rating of the compliance expandable screens may be low.
Consequently, there is a need for zonal isolation in water injector well completions. Further needs include a completion system for completing a water injector well that provides an inner diameter sufficient for the deployment of flow control valves and the like. Additional needs include a completion system that provides functionality of a cased hole for zonal isolation. In addition, needs include a more efficient system for water injector well completions that prevents cross flow between zones and prevents solids production.
BRIEF SUMMARY OF SOME OF THE PREFERRED EMBODIMENTSThese and other needs in the art are addressed in one embodiment by an injector well completion system in a formation. The system includes a casing string disposed in a wellbore having an annulus. The casing string has casing and a perforating gun. In addition, the casing string is run into the wellbore and cemented to provide a cemented casing string including the perforating gun. The system further includes running tubing into the wellbore inside the cemented casing string.
In another embodiment, these and other needs in the art are addressed by a method of completing an injector well. The method includes running a casing string in a wellbore having an annulus. The casing string includes a casing and a perforating gun. The method further includes cementing the casing string to provide a cemented casing string that includes the perforating gun. In addition, the method includes running tubing into the wellbore inside the cemented casing string.
The foregoing has outlined rather broadly features and technical advantages of embodiments in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter that form the subject of the claims. It should be appreciated by those skilled in the art that the conception and the specific embodiments disclosed may be readily utilized as a basis for modifying or designing other embodiments for carrying out the same purposes. It should also be realized by those skilled in the art that such equivalent embodiments do not depart from the spirit and scope of the invention as set forth in the appended claims.
For a detailed description of the preferred embodiments, reference will now be made to the accompanying drawings in which:
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Without limitation, embodiments of injector well completion system 5 prevent cross-flow between zones (i.e., zones 80, 85, and 87). For instance, as shown in
It is to be understood that injector well completion system 5 is not limited to injection but may also be applied for production of hydrocarbons from formation 75. In an embodiment, after perforating guns 110 are actuated and fractures 95 are created, pressure in annulus 120 may be reduced to a sufficient pressure at which the hydrocarbons flow from formation 75 through fractures 95 to annulus 120 and flow up annulus 120 for production. Pressure in annulus 120 may be reduced by any suitable method. In an embodiment as illustrated in
Although the embodiments and advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims
1. An injector well completion system in a formation, comprising:
- a casing string disposed in a wellbore comprising an annulus, wherein the casing string comprises a casing and a perforating gun, and wherein the casing string is run into the wellbore and cemented to provide a cemented casing string comprising the perforating gun; and
- wherein tubing is run into the wellbore inside the cemented casing string.
2. The injector well completion system of claim 1, further comprising a flow control valve, wherein the flow control valve controls pressure communication from the annulus to the perforating gun.
3. The injector well completion system of claim 2 wherein the flow control valve is retrievable.
4. The injector well completion system of claim 2, further comprising a control line that controls operation of the flow control valve.
5. The injector well completion system of claim 4, wherein the pressure in the control line selects a choke for the flow control valve.
6. The injector well completion system of claim 4, wherein the pressure in the control line is controlled from the surface.
7. The injector well completion system of claim 4, wherein the pressure in the control line is controlled by annulus pressure.
8. The injector well completion system of claim 1, further comprising a fixed choke inflow control valve, wherein the fixed choke inflow control valve controls pressure communication from the annulus to the perforating gun.
9. The injector well completion system of claim 8 wherein the fixed choke inflow control valve is retrievable.
10. The injector well completion system of claim 8, further comprising a back flow check valve.
11. The injector well completion system of claim 1, further comprising a sensor bridle and a sensor.
12. The injector well completion system of claim 1, further comprising more than one perforating gun.
13. The injector well completion system of claim 1, further comprising packers and at least one flow control valve, wherein the packers, the at least one flow control valve, and the tubing isolate each perforating gun from cross-flow from other perforating guns.
14. The injector well completion system of claim 1, further comprising more than one perforating gun, wherein each perforating gun has a back flow check valve that controls liquid flow from the annulus to the each perforating gun.
15. The injector well completion system of claim 12, further comprising packers, wherein the packers, the more than one fixed choke inflow control valve, and the tubing isolate each perforating gun from cross-flow from other perforating guns.
16. The injector well completion system of claim 1, wherein pressure communication from the annulus actuates the perforating gun to create perforations in the cement and casing.
17. The injector well completion system of claim 1, wherein a reduction in annulus pressure allows hydrocarbons to flow from the formation to the annulus.
18. A method of completing an injector well, comprising:
- (A) running a casing string in a wellbore comprising an annulus, wherein the casing string comprises a casing and a perforating gun;
- (B) cementing the casing string to provide a cemented casing string comprising the perforating gun; and
- (C) running at least one flow control valve or fixed choke inflow control device into the wellbore inside the cemented casing string.
19. The method of claim 18, further comprising actuating the perforating gun.
20. The method of claim 18, wherein the casing string comprises more than one perforating gun, and wherein the method further comprises isolating each perforating gun from cross-flow from other perforating guns.
21. The method of claim 20, further comprising actuating the more than one perforating gun sequentially.
22. The method of claim 18 wherein the at least one flow control valve or fixed choke inflow control device is retrievable.
Type: Application
Filed: Sep 17, 2008
Publication Date: Mar 19, 2009
Inventor: Dinesh R. Patel (Sugar Land, TX)
Application Number: 12/211,851
International Classification: E21B 43/112 (20060101); E21B 33/13 (20060101);