A well kill plugging slurry and plugging method for well completion and oil testing

A plugging method and a technology of plugging slurry, which are applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc., and can solve the problem of low plugging success rate of thin bridge plugs and plugging agents while drilling, and downhole problems. Problems such as plugging of the perforation test string and failure of the packer to be unsealed smoothly, to avoid plugging and jamming accidents, improve pressure bearing capacity, and improve retention

Active Publication Date: 2021-08-13
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) When lost circulation occurs at a large leakage rate, the thicker bridge plugging agent particles can easily lead to blockage of the downhole perforation test string, failure of the packer to be unsealed smoothly, or perforation gun jamming, such as Turkmen Hok -21 Well, Aga-24 Well, and Tag-21 Well's downhole complex are all such reasons that lead to long-term accidents and complicated handling;
[0006] (2) In the case of lost circulation with low leakage rate, the success rate of thin bridge plug and LWD plugging agent is not high, and the loss of lost circulation is huge and threatens the safety of well control, such as Well Jor-21 and Well Hojg-22 in Turkmenistan , Aga-22 well and other plugging construction

Method used

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  • A well kill plugging slurry and plugging method for well completion and oil testing

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Experimental program
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Effect test

Embodiment 1

[0043] The invention discloses a well-killing plugging slurry for well completion testing. Based on conventional well-completion well-killing fluids, the following components are added in terms of the mass percentage of conventional well-completion well-killing fluids:

[0044] A. LWD plugging agent SDL: 4.5%;

[0045] B. Temporary plugging agent PCC for drilling fluid: 4.0%;

[0046] C. Composite plugging agent FDJ-Ⅰ: 3.0%;

[0047] D. Flexible mesh fiber plugging agent AT-FB: 0.2%;

[0048] The processing length of the flexible mesh fiber lost circulation agent AT-FB is 19mm, and the equivalent diameter is <100um.

[0049] The plugging agent SDL while drilling is an existing technology, and its implementation standard refers to the enterprise standard Q / 77982897-8.1-2017 of Sichuan Hengyi Technology Co., Ltd.

[0050] The processing length of the flexible mesh fiber lost circulation agent AT-FB is 12-19mm, and the equivalent diameter is <100um. The fiber has strong suspe...

Embodiment 2

[0057] The invention discloses a well-killing and plugging slurry for well completion testing. Based on conventional well-completion well-killing fluids, the following components are added in terms of the mass percentage of conventional well-completion well-killing fluids:

[0058] A. LWD plugging agent SDL: 5%;

[0059] B. Temporary plugging agent PCC for drilling fluid: 5%;

[0060] C. Composite plugging agent FDJ-I: 5.5%;

[0061] D. Flexible mesh fiber plugging agent AT-FB: 0.5%;

[0062] The processing length of the flexible network fiber lost circulation agent AT-FB is 12mm, and the equivalent diameter is <100um.

Embodiment 3

[0064] The invention discloses a well-killing and plugging slurry for well completion testing. Based on conventional well-completion well-killing fluids, the following components are added in terms of the mass percentage of conventional well-completion well-killing fluids:

[0065] A. Plugging agent SDL while drilling: 5.0%;

[0066] B. Temporary plugging agent PCC for drilling fluid: 5.0%;

[0067] C. Composite plugging agent FDJ-I: 5%;

[0068] D. Flexible mesh fiber plugging agent AT-FB: 0.4%;

[0069] The processing length of the flexible mesh fiber lost circulation agent AT-FB is 15mm, and the equivalent diameter is <100um.

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Abstract

The invention discloses a well kill plugging slurry used for well completion testing and a plugging method thereof, and relates to the technical field of oil and gas well completion testing engineering. Completion and killing fluid mass percentage meter, add the following components: A. Lost circulation plugging agent SDL while drilling: 4.5% to 5.0%; B. Temporary plugging agent PCC for drilling fluid: 4.0% to 5.0%; C. Composite plugging agent Agent FDJ‑Ⅰ: 3.0%~5.5%; D, flexible network fiber plugging agent AT‑FB: 0.2%‑0.5%; adjust the density of plugging slurry to 1.85 g / cm 3 -1.93g / cm 3 , with a concentration of 15.4%‑16.4%, injected into the unpacked packer in positive circulation for plugging. The use of this plugging slurry can not only prevent the gap between the packer and the casing from being blocked, resulting in failure to set or unseal smoothly, but also prevent the jamming of the perforation test string caused by the blockage of the gap between the detonation impact rod of the perforating gun and the tubing ACCIDENT.

Description

technical field [0001] The invention relates to the technical field of oil and gas well completion testing engineering, in particular to a well killing and plugging slurry suitable for well completion and oil testing operations and a plugging method thereof. Background technique [0002] The reservoir lithology of the Amu Darya gas field in Turkmenistan is mostly carbonate rock with well-developed fractures, with high pressure coefficient and uneven distribution, many formation fault zones and well-developed fractures. In the process of well completion and oil testing, due to the high test output and strong sprinting destructive power, the test string needs to undertake multiple tasks such as perforation, acid squeezing, liquid drainage, testing, well testing, well killing, etc. In addition, due to formation reasons, lost circulation occurs frequently , The plugging construction is difficult and the risk of well control is high, especially after the acidizing operation, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42E21B33/13
CPCC09K8/426C09K2208/08C09K2208/32E21B33/13
Inventor 吉永忠高利华杨刚陈华赵渝
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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