Wellbore plug structure and method for pressure testing a wellbore

a wellbore and plug technology, applied in the direction of wellbore/well accessories, sealing/packing, construction, etc., can solve the problems of premature opening of the sleeve, invalidating the initial pressure test, and preventing the sleeve from opening

Inactive Publication Date: 2018-02-15
JANUS TECH SERVICES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent is about a wellbore plug structure that allows for a full pressure test of the casing without the need for a toe sleeve. The plug structure also prevents the pressure test from being performed against an atmospheric chamber. The technical effect is the ability to perform a more efficient and reliable pressure test without the need for additional equipment or procedures.

Problems solved by technology

However, after the pressure test, a flow path must be formed through the toe sleeve by using a pressure in excess of the test pressure, thereby invalidating the initial pressure test.
The applied pressure may allow fluid to move past the O-ring and into the atmospheric chamber, which would either prematurely open the sleeve or prevent the sleeve from opening after the pressure test.

Method used

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  • Wellbore plug structure and method for pressure testing a wellbore
  • Wellbore plug structure and method for pressure testing a wellbore
  • Wellbore plug structure and method for pressure testing a wellbore

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Embodiment Construction

[0028]The present disclosure is directed to wellbore plug structures and methods of pressure testing a wellbore, e.g., methods utilizing wellbore plug structures having the relevant operational characteristics of the wellbore plug structures disclosed herein.

[0029]Generally, a wellbore plug structure according to certain embodiments of the present disclosure includes a tubular member, a wiping member disposed around the tubular member, and a piston member that is at least partially disposed in the tubular member. The piston member is configured to prevent a fluid from contacting a dissolvable component of the wellbore plug structure until the piston member is moved under the force of pressure to create a fluid pathway to the dissolvable component. In one embodiment, a temporary fluid stopper includes a dissolvable fluid obstructing portion, and the piston member releases (e.g., moves downward) to expose the dissolvable fluid obstructing portion to a fluid. In this regard, the tubula...

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Abstract

A wellbore plug structure and a method for pressure testing a wellbore using the plug structure. The plug structure advantageously allows pressure testing of the wellbore casing without the use of a toe sleeve and without requiring the application of a pressure in excess of the wellbore pressure test after testing is completed. The wellbore plug structure includes a piston member that can be released at any time after placement of the structure in the wellbore casing to expose a dissolvable element to a pressurizing fluid. A pressure test may then be conducted before the fluid completely dissolves the dissolvable element. Once the dissolvable element is dissolved, a fluid pathway through the wellbore plug structure is created that many enable the placement of tooling through the plug structure.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority benefit of U.S. Provisional Patent Application No. 62 / 375,203, filed on Aug. 15, 2016, the disclosure of which is incorporated herein by reference in its entirety.FIELD[0002]This disclosure relates to the field of wellbore plugs, such as wellbore plugs that are used for the construction and / or use of a wellbore for the extraction of natural resources from the earth, such as oil, gas, water and the like.BACKGROUND[0003]In the downhole drilling industry, e.g., for oil and gas extraction, it is common practice to drill a borehole and install a casing in the borehole to form a well. The casing is commonly cemented into the borehole, which may include pumping a wiper plug down the casing to force the cement through a port located at a distal end of a casing string. After completion of the cementing operation, it is often necessary to conduct an integrity test on the casing before fracturing operations to en...

Claims

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Application Information

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IPC IPC(8): E21B33/12E21B37/10
CPCE21B33/12E21B37/10E21B47/1025E21B33/134E21B34/063E21B47/117
InventorLARISEY, MICHAEL SHANE
OwnerJANUS TECH SERVICES LLC