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Title:
CEMENT SLURRY SUPPLYING METHOD, AND BOREHOLE EXCAVATION METHOD AND CEMENTING METHOD USING SAID SUPPLYING METHOD
Document Type and Number:
WIPO Patent Application WO/2020/245882
Kind Code:
A1
Abstract:
The present invention uses a simple method to prevent cement slurry and a hardening accelerator from coming into contact with each other within a cementing tool. This cement slurry supplying method comprises: adding capsules C filled with a cement slurry hardening accelerator to cement slurry; and supplying the cement slurry added with the capsules C into a borehole through a cementing tool 105 installed in the borehole. The capsules C become dissolved or disintegrated after elapse of a predetermined time that is longer than an efflux time starting from the addition of the capsules C to the cement slurry and ending when the cement slurry pours out of the cementing tool 105.

Inventors:
YOSHIOKA MASATO (JP)
Application Number:
PCT/JP2019/022012
Publication Date:
December 10, 2020
Filing Date:
June 03, 2019
Export Citation:
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Assignee:
KANTO NATURAL GAS DEV CO LTD (JP)
International Classes:
E21B33/13; E21B33/14
Domestic Patent References:
WO2016175261A12016-11-03
Foreign References:
JP2017511850A2017-04-27
JP2001348257A2001-12-18
JPS6314957A1988-01-22
JP2008247650A2008-10-16
JPS63210390A1988-09-01
JP2013204356A2013-10-07
JP2014020034A2014-02-03
JPH0642281A1994-02-15
JPH1192188A1999-04-06
JPS63233031A1988-09-28
JPH0658071A1994-03-01
JPS61237792A1986-10-23
Attorney, Agent or Firm:
MIYAZAKI Teruo et al. (JP)
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