Invention Grant
- Patent Title: Removing filter cake with delayed enzymatic breakers
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Application No.: US16732799Application Date: 2020-01-02
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Publication No.: US10995258B1Publication Date: 2021-05-04
- Inventor: Hui Zhou , Jay Paul Deville , William Walter Shumway
- Applicant: Halliburton Energy Services, Inc.
- Applicant Address: US TX Houston
- Assignee: Halliburton Energy Services, Inc.
- Current Assignee: Halliburton Energy Services, Inc.
- Current Assignee Address: US TX Houston
- Agency: Chamberlain Hrdlicka
- Main IPC: E21B21/00
- IPC: E21B21/00 ; C09K8/524 ; E21B37/00

Abstract:
A composition for servicing a borehole in a subterranean formation by removing a filter cake along a wall of the borehole includes a biopolymer, the composition including a carrier fluid effective to act as a transport medium; an enzymatic breaker having activity to degrade the biopolymer in the filter cake upon contact with the filter cake so as to break up the biopolymer for removal; and an enzyme inhibitor effective to slow down the activity of the enzymatic breaker; where the composition may exclude the biopolymer. A method of servicing a borehole includes contacting the filter cake with the composition; degrading the biopolymer with the enzymatic breaker to produce degraded biopolymer; slowing down the degrading activity of the breaker with the enzyme inhibitor sufficiently that the degrading comprises degrading biopolymer along a length of the wall of the borehole; and removing the filter cake from the wall of the borehole.
Information query