Well re-fracturing method

a well and refracturing technology, applied in the direction of fluid removal, borehole/well accessories, survey, etc., can solve the problems of refracturing a well and the success of refracturing treatment, and achieve the effect of reducing the displacement rate of the tool

US20160333680A1Inactive Publication Date: 2016-11-17SCHLUMBERGER TECH CORP
10 Cites 43 Cited by

Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
Publication Date
2016-11-17
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A method of re-treating a well with pre-existing fractures which includes: displacing a tool in a well, leaking off motive fluid to an open fracture zone passed by the tool to diminish the rate of displacement, and locating the open fracture zone above the tool.
Need to check novelty before this filing date? Find Prior Art

Description

CROSS REFERENCE TO RELATED APPLICATION(S)

[0001] None.BACKGROUND

[0002] Re-fracturing a well is a challenging operation, the success of which is in part dictated by the often unknown state of the well and associated formation at the start of the re-fracturing treatment. Often, the initial or previous fracturing treatment(s) has been designed to place several fractures along the wellbore. In the time between the fracturing treatment and the subsequent re-fracturing treatment, many parameters of the well may have changed, and / or parameters at the time of the fracturing may be otherwise unavailable, resulting in a number of unknown parameters which may impact the success of the re-fracturing treatment.

[0003] Examples of typical unknown parameters that affect the design and execution of a re-fracturing treatment may include the number and location of open fractures along the wellbore at the start of the re-fracturing treatment, pore pressure and its distribution profile, and stress variation...

Examples

Embodiment Construction

[0041]In some embodiments the disclosure herein relates to a method of re-fracturing a well with pre-existing fractures, comprising: deploying into the well a tool connected to surface by a cable; pumping a motive fluid into the well at a flow rate effective to displace the tool in the well past one or more open fracture zones; leaking off the motive fluid into the one or more open fracture zones passed by the tool, to diminish a rate of displacement of the tool relative to a rate of the pumping the motive fluid into the well, and locate the one or more open fracture zones above the tool; and treating at least one of the one or more open fracture zones located above the tool. In some embodiments, the treating comprises re-fracturing at least one of the pre-existing fractures.

[0042]In some embodiments the method further comprises tensioning the cable to selectively leak off the motive fluid into the one or more open fractures passed by the tool. In some embodiments the cable comprise...