ARRANGEMENT AND METHOD FOR SENDING AND/OR SEALING CEMENT AT A LINER HANGER
An apparatus for verifying cement arrival at a target location including a liner and a sensory structure radially outwardly disposed of the liner at a target arrival location of cement from a cementing operation; the sensory structure capable of sensing arrival of cement. A method for verifying completion of a cementing operation. A method for addressing micro annulus formation in a downhole cementing operation
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Liner hangers in the hydrocarbon recovery industry are often cemented into a casing string or into an open hole both to keep them in place and to seal annularly around the liner hanger. While this is often effective for its intended purpose, it is known in the industry that cracks may sometimes form in the cement immediately adjacent the liner or liner hanger. These cracks form what is known as a “micro annulus” through which it is possible for gas or other fluid to migrate to a place in the well where such fluid is undesirable, or even to the surface. In general, the cracks are due to cementing procedure or composition that is inappropriate for the conditions where the cement will be installed. This may be due to operator error or to a change in conditions in the well or a lack of knowledge about the conditions in the well.
Having a micro annulus is undesirable as generally they reduce productivity of the well by contaminating the production stream or creating other problems requiring additional procedures. This causes delay; and delay, it is known, costs money. The art would therefore well receive additional apparatuses and methods that effectively address the foregoing issues.
SUMMARYAn apparatus for verifying cement arrival at a target location including a liner and a sensory structure radially outwardly disposed of the liner at a target arrival location of cement from a cementing operation; the sensory structure capable of sensing arrival of cement.
A method for verifying completion of a cementing operation comprising cementing a liner in a borehole and sensing an arrival of the cement at a target location.
A method for addressing micro annulus formation in a downhole cementing operation including cementing a liner in a borehole, sensing an arrival of the cement at a target location, and deploying a seal into contact with the cement.
Referring now to the drawings wherein like elements are numbered alike in the several Figures:
Referring to
In one embodiment, a sensor is included that is capable of sensing the presence of cement. This can be done in a number of ways, for example, but not limited to, density measurement, alkalinity measurement, optic measurement, electrical impedance measurement across a pair of electrodes, etc. All of these and others are capable of recognizing the difference between borehole fluids and the cement 26 and therefore will provide a signal that is accurate with respect to the arrival of the cement. The sensor should be positioned proximate a planned end of cement movement. Pumping and arrival of the cement at its destination is schematically illustrated in
Referring to
In one embodiment, the deployment of the seal 30 is made automatic upon the sensing of cement at the target location. In this embodiment, intervention from the surface is not necessary. In another embodiment, a signal is sent to the surface where a decision on further action can be made. In yet another embodiment, a downhole controller whether remote from or adjacent to the configuration 24 can be programmed to take certain actions under certain inputs from the configuration 24.
Referring to
While preferred embodiments have been shown and described, modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustrations and not limitation.
Claims
1. An apparatus for verifying cement arrival at a target location comprising:
- a liner;
- a sensory structure radially outwardly disposed of the liner at a target arrival location of cement from a cementing operation, the sensory structure capable of sensing arrival of cement.
2. The apparatus as claimed in claim 1 further comprising a communication conduit in operable communication with the sensory structure.
3. The apparatus as claimed in claim 2 wherein the communication conduit is a wire.
4. The apparatus as claimed in claim 1 wherein the sensory structure is a pair of electrodes.
5. The apparatus as claimed in claim 1 wherein the sensory structure is a magnetostrictive element.
6. The apparatus as claimed in claim 1 wherein the sensory structure is a Hall effect sensor.
7. The apparatus as claimed in claim 1 wherein the sensory structure is a density sensor.
8. The apparatus as claimed in claim 1 wherein the sensory structure is an alkalinity sensor.
9. The apparatus as claimed in claim 1 further comprising a seal configuration.
10. The apparatus as claimed in claim 9 wherein the seal configuration is located relative to the sensory structure such that in use the seal will be upstream of the sensory structure relative to a direction of cement movement.
11. The apparatus as claimed in claim 1 wherein the sensory structure is configured to communicate with a controller.
12. The apparatus as claimed in claim 11 wherein the controller is an operator at surface.
13. The apparatus as claimed in claim 11 wherein the controller is located in the downhole environment.
14. The apparatus as claimed in claim 11 wherein the controller is at the sensory structure.
15. The apparatus as claimed in claim 11 wherein the controller is programmer to automatically deploy a seal after receiving a signal from the sensory structure.
16. The apparatus as claimed in claim 1 further comprising a seal.
17. A method for verifying completion of a cementing operation comprising:
- cementing a liner in a borehole;
- sensing an arrival of the cement at a target location.
18. The method as claimed in claim 17 further comprising communicating the sensed arrival of the cement to a controller.
19. A method for addressing micro annulus formation in a downhole cementing operation comprising:
- cementing a liner in a borehole;
- sensing an arrival of the cement at a target location;
- deploying a seal into contact with the cement.
20. The method as claimed in claim 19 wherein the deploying is automatic.
21. The method as claimed in claim 19 wherein the deploying is selective.
Type: Application
Filed: Aug 20, 2008
Publication Date: Feb 25, 2010
Applicant: BAKER HUGHES INCORPORATED (Houston, TX)
Inventors: Gerald D. Lynde (Houston, TX), Douglas J. Murray (Magnolia, TX)
Application Number: 12/195,074
International Classification: E21B 43/00 (20060101); E21B 47/00 (20060101);