A kind of high temperature hard rubber recyclable foam drilling fluid and preparation method thereof

A drilling fluid and high-temperature technology, applied in the field of foam drilling fluid and its preparation, can solve the problems of insufficient service life of recirculating foam drilling fluid, high content of bentonite, short foam half-life, etc., and achieve strong resistance to metal ion pollution and simplify the preparation procedure , Improve the effect of application accuracy

Active Publication Date: 2022-07-29
中石化石油工程技术服务有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the shortcomings of the existing foam drilling fluid such as short half-life of foam after high temperature and high requirements for additional equipment on site, insufficient service life of recirculating foam drilling fluid, few cycles, or high content of bentonite, the present invention provides a high-temperature hard glue recirculating foam drilling Liquid and its preparation method, in order to improve the surface strength of the microfoam system, enhance the film elasticity of the microfoam in the high temperature and pressure environment of the wellbore and the bottom of the well, prolong the half-life of the foam, and increase the cycle times of the microfoam drilling fluid technology

Method used

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  • A kind of high temperature hard rubber recyclable foam drilling fluid and preparation method thereof
  • A kind of high temperature hard rubber recyclable foam drilling fluid and preparation method thereof
  • A kind of high temperature hard rubber recyclable foam drilling fluid and preparation method thereof

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preparation example Construction

[0058] The preparation method of the aforementioned high temperature hard rubber recyclable foam drilling fluid, comprising:

[0059] (1) Take 100 parts of clean water, add 0.2-0.8 part of low-molecular weight anti-high temperature foam stabilizer to it, stir with a low-speed mixer for 1-4 hours; add 0.1-0.2 part of high-temperature wetting agent after uniform dispersion and dissolution, and fully stir for 10- 30min; add 1-2 parts of bubble film density reducing agent, fully stir for 5-10min, and let stand for 2-4h to ensure that it is fully swollen to form a temperature-resistant hard glue base liquid;

[0060] (2) Weigh 0-3 parts of temperature-resistant sodium bentonite, 0-0.1 part of alkaline regulator, 0.1-0.5 part of high-temperature polymer fluid loss reducer, 0.3-0.5 part of high-temperature foaming agent, and high-temperature and salt-resistant filtration reducing agent Mix 1 to 3 parts of the lost agent evenly, add the temperature-resistant hard rubber base fluid (1)...

Embodiment 1

[0062] Take 100 parts of clean water, add 0.3 part of low molecular weight anti-high temperature foam stabilizer TFS to it, stir with a low-speed agitator for 2 hours; add 0.2 part of alkylphenol polyoxyethylene ether after uniform dispersion and dissolution, and fully stir for 15min; add modified hardener 3 parts of shell plant fiber powder, fully stirred for 5 minutes, and left to stand for 2 hours to form a temperature-resistant hard glue base liquid. Accurately weigh 2 parts of anti-temperature sodium bentonite, 0.08 part of sodium carbonate, 0.1 part of sulfonate polymer fluid loss reducer, 0.2 part of sodium α-olefin sulfonate, 0.1 part of sodium dodecylbenzene sulfonate, and nitrile silicon dioxide 2 parts of fluid loss agent and 1 part of polyoxyethylene type fluid loss reducer were mixed evenly, and the above temperature-resistant hard gum base liquid was added while stirring, and stirred with a low-speed strong mixer at 900 r / min for 6 hours.

Embodiment 2

[0064] Take 100 parts of clean water, add 0.3 part of low molecular weight anti-high temperature foam stabilizer TFS to it, stir with a low-speed agitator for 2 hours; after uniform dispersion and dissolution, add 0.1 part of alkylphenol polyoxyethylene ether and sorbitan monooleate respectively. 0.1 part, fully stirred for 15min; added 2 parts of modified hard shell plant fiber powder and 1 part of modified mica fiber powder, fully stirred for 10min, and stood for 2h to form a temperature-resistant hard glue base liquid. Accurately weigh 3 parts of anti-temperature sodium bentonite, 0.1 part of sodium carbonate, 0.3 part of comb polymer fluid loss reducer, 0.2 part of sodium α-olefin sulfonate, 0.1 part of sodium dodecylbenzene sulfonate, nitrile silicon filter 2 parts of agent loss, 1 part of polyoxyethylene type fluid loss reducer, 1 part of sulfonated phenolic resin, mix well, add the above temperature-resistant hard gum base liquid while stirring, and stir with a low-speed...

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Abstract

The invention discloses a high-temperature hard rubber recyclable foam drilling fluid and a preparation method thereof. 0.2~0.8 parts of low molecular weight anti-high temperature foam stabilizer, 1~2 parts of bubble film density reducing agent and 0.1~0.2 parts of high temperature wetting agent are pre-prepared into high temperature resistant hard rubber base liquid in clear water, and then the temperature resistant sodium bentonite is mixed. 0~3 parts of alkaline regulator, 0.3~0.5 parts of high temperature foaming agent, 0.1~0.5 parts of high temperature and salt resistant fluid loss reducer and 1~3 parts of high temperature resin fluid loss reducer and mixed evenly. Add it into the high temperature resistant base liquid while stirring, and stir it with a low-speed strong stirrer for 5 to 7 hours. The invention has low solid phase content, strong membrane structure, excellent foam stabilization effect under high temperature environment, improves the recirculation times of the completion fluid after the micro-foam drilling fluid and the loss-stopping effect under high temperature and high pressure, and makes the recirculatable micro-foam drilling and completion fluid safe. It is efficiently used in the exploitation of medium, high temperature and low pressure oil and gas resources, geothermal wells or salt gypsum layers, etc., to meet the drilling needs of deep and ultra-deep wells.

Description

technical field [0001] The invention relates to the technical field of leakage prevention and plugging of drilling engineering, in particular to a foam drilling fluid with high temperature resistance and strong membrane structure, which can be recycled on the ground and in the wellbore and a preparation method thereof. Background technique [0002] Foam drilling fluid is a low-density key drilling fluid technology for low-pressure and malignant leakage formations. The main development is the inflatable foam drilling fluid technology and the recirculating foam drilling fluid technology. [0003] The inflatable foam drilling fluid cannot be recycled in the well. It enters the well after being foamed by special equipment at the wellhead. After the foam fluid returns to the wellhead, it is separated from liquid, gas and solid by physical degassing or chemical defoaming, and then added to the recovered base fluid. The foaming agent or special treatment agent is re-inflated and f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/38C09K8/035
CPCC09K8/38C09K8/035
Inventor 杨倩云王宝田李炳太袁丽刘均一李秀灵王志
Owner 中石化石油工程技术服务有限公司
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