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High-temperature ebonite recyclable foam drilling fluid and preparation method thereof

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

Active Publication Date: 2021-07-16
中石化石油工程技术服务有限公司 +2
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  • Summary
  • 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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  • High-temperature ebonite recyclable foam drilling fluid and preparation method thereof
  • High-temperature ebonite recyclable foam drilling fluid and preparation method thereof
  • High-temperature ebonite 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 glue recyclable foam drilling fluid includes:

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

[0060] (2) Weigh 0-3 parts of temperature-resistant sodium bentonite, 0-0.1 parts of alkaline regulator, 0.1-0.5 parts of high-temperature polymer fluid loss reducer, 0.3-0.5 parts of high-temperature foaming agent, and high-temperature and salt-resistant fluid loss reducer Mix 1-3 parts of the lost agent evenly, add it into the temperature-res...

Embodiment 1

[0062] Take 100 parts of clear water, add 0.3 parts of low molecular weight anti-high temperature foam stabilizer TFS to it, stir with a low-speed stirrer for 2 hours; 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 gum base liquid. Accurately weigh 2 parts of temperature-resistant 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 dodecylbenzenesulfonate, nitrile silicon reducer Mix 2 parts of fluid loss agent and 1 part of polyoxyethylene-based fluid loss reducer evenly, add the above-mentioned temperature-resistant hard rubber base solution while stirring, and stir with a low-speed strong stirrer at 900r / min for 6h.

Embodiment 2

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

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Abstract

The invention discloses a high-temperature ebonite recyclable foam drilling fluid and a preparation method thereof. The preparation method comprises the following steps: pre-preparing a high-temperature-resistant ebonite base solution from 0.2-0.8 part of a low-molecular-weight high-temperature-resistant foam stabilizer, 1-2 parts of a bubble film density lightening agent and 0.1-0.2 part of a high-temperature wetting agent in clear water; and uniformly mixing 0-3 parts of temperature-resistant sodium bentonite, 0-0.1 part of an alkaline regulator, 0.3-0.5 part of a high-temperature foaming agent, 0.1-0.5 part of a high-temperature-resistant salt-resistant filtrate reducer and 1-3 parts of a high-temperature-resistant resin filtrate reducer, adding the mixture into the high-temperature-resistant base solution while stirring, and conducting stirring for 5-7 hours by using a low-speed strong stirrer. The solid phase content is low, and the membrane structure is strong; and the foam stabilizing effect is excellent in a high-temperature environment, the cycle index of the completion fluid after the micro-foam drilling fluid is increased, the leaking stoppage effect under high temperature and high pressure is improved, the safe and high effect of the recyclable micro-foam drilling and completion fluid is used for exploiting medium-high-temperature low-pressure easily-leaking oil and gas resources, geothermal wells or salt-gypsum layers and the like, and the drilling requirements of deep wells and ultra-deep wells are met.

Description

technical field [0001] The invention relates to the technical field of leakage prevention and plugging in drilling engineering, in particular to a foam drilling fluid that is resistant to high temperature, has a strong membrane structure, and can be recycled on the ground and in a wellbore and a preparation method thereof. Background technique [0002] Foam drilling fluid is a low-density key drilling fluid technology for formations with low pressure and malignant loss. It has the characteristics of strong leakage prevention and plugging, low filtration loss, low reservoir damage, and strong rock-carrying ability. The main developments are aerated foam drilling fluid technology and recyclable foam drilling fluid technology. [0003] The aerated 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, the liquid, gas and solid are separated by physical degassin...

Claims

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Application Information

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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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