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Drilling fluid

A technology of drilling fluid and alkyl glycoside, applied in the field of drilling fluid, can solve the problems of loss, unachievable performance, unfavorable drilling operations, etc., and achieve the effect of low cost and good inhibition.

Inactive Publication Date: 2018-05-04
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] In the process of oil and gas drilling, when drilling into highly water-sensitive shale with high clay mineral content and easily collapsed formations such as shale containing shale, ordinary water-based drilling fluids have better anti-collapse effects, low cost, and green It is environmentally friendly, but it cannot effectively inhibit the hydration expansion and dispersion of strong water-sensitive formations, and its performance cannot reach the level comparable to that of oil-based drilling fluids. Therefore, oil-based drilling fluids are the first choice when drilling in highly active and easily collapsed formations
However, oil-based drilling fluids have problems such as high preparation costs, unfavorable drilling operations, serious losses during lost circulation, and high pressure for post-treatment of cuttings. These shortcomings limit the large-scale application of oil-based drilling fluids

Method used

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preparation example Construction

[0045] In the present invention, the preparation method of the cationic alkyl glycoside having the structure of formula I preferably comprises the following steps:

[0046] (A1) Under the action of a catalyst, hydrolyze the chlorinated alkyl epoxide and water to obtain a hydrolyzate;

[0047] (A2) reacting the hydrolyzate with an alkyl glycoside to obtain a chlorohydrin glycoside;

[0048] (A3) reacting the chlorohydrin glycoside with a tertiary amine to obtain a cationic alkyl glycoside.

[0049] In the present invention, the catalyst is preferably an acidic catalyst, which may be one or more of organic acids and inorganic acids. In the present invention, the organic acid is preferably a sulfonic acid compound, more preferably toluenesulfonic acid, dodecylbenzenesulfonic acid or sulfamic acid. In the present invention, the inorganic acid is preferably sulfuric acid, nitric acid or phosphoric acid. The present invention has no special limitation on the specific type of the ...

Embodiment 1

[0107] Add 0.2 mol of epichlorohydrin, 2.4 mol of distilled water and 0.004 mol of p-toluenesulfonic acid into a high-pressure reactor equipped with a thermometer, condenser, and stirrer, and react under normal pressure at 60°C for 3 hours to obtain 3-chloro - 1-2-propanediol aqueous solution;

[0108] Cool the 3-chloro-1-2-propanediol aqueous solution to normal temperature, add 0.4 mol of methyl glucoside to it, and react at normal pressure 80°C for 0.5 hours to obtain a chlorohydrin glycoside solution;

[0109] The chlorohydrin glucoside solution was neutralized with a saturated aqueous sodium hydroxide solution to a pH value of 7, and then 0.04 moL of a 33.3% trimethylamine aqueous solution was added to the bottom of the chlorohydrin glycoside solution, and the addition was completed within 1 hour , reacted at 40° C. for 3 hours to obtain cationic methyl glucoside, and the yield of the product was 95.25%.

[0110] The cationic methyl glucoside prepared in Example 1 of the ...

Embodiment 2

[0112] Add 0.2 mol of epichlorohydrin, 3.2 mol of distilled water and 0.014 mol of p-sulfamic acid into a high-pressure reactor equipped with a thermometer, condenser, and stirrer, and react under normal pressure at 80°C for 6 hours to obtain 3-chlorohydrin - 1-2-propanediol aqueous solution;

[0113] Cool the 3-chloro-1-2-propanediol aqueous solution to normal temperature, add 0.22 moL ethyl glucoside to it, and react at normal pressure 90°C for 3 hours to obtain a chlorohydrin glycoside solution;

[0114] The chlorohydrin glycoside solution was neutralized with saturated potassium hydroxide aqueous solution to a pH value of 7, and then 0.2 moL trimethylamine aqueous solution was added to the bottom of the chlorohydrin glycoside solution, and the addition was completed within 1 hour. After reacting for 7 hours, cationic ethyl glucoside was obtained, and the yield of the product was 93.57%.

[0115] The cationic ethyl glucoside prepared in Example 2 of the present invention i...

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Abstract

The invention provides a drilling fluid. The drilling fluid is prepared from cationic alkyl glucoside, polyether amino alkyl glucoside, a treating agent and water, wherein the cationic alkyl glucosideis of a structure shown as formula I; the polyether amino alkyl glucoside is of a structure shown as formula II. Compared with the prior art, the drilling fluid adopts the cationic alkyl glucoside and the polyether amino alkyl glucoside with specific structures as main components, so that the obtained drilling fluid has better inhibition performance, lubricity, heat resistance and reservoir protectiveness under joint action of the cationic alkyl glucoside and the polyether amino alkyl glucoside, and the drilling fluid is not only applicable to horizontal drilling of sloughing formations suchas shale, mudstone and the like as well as shale gas, but also applicable to drilling of formations with higher requirements for reservoir protectiveness. The drilling fluid is a water-based drillingfluid, is lower in cost, safe and environmentally friendly and can be directly discharged and applied to formations with higher environmental requirements.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a drilling fluid. Background technique [0002] In the process of oil and gas drilling, when drilling into highly water-sensitive shale with high clay mineral content and easily collapsed formations such as shale containing shale, ordinary water-based drilling fluids have better anti-collapse effects, low cost, and green It is environmentally friendly, but it cannot effectively inhibit the hydration expansion and dispersion of strong water-sensitive formations, and its performance cannot reach the level comparable to that of oil-based drilling fluids. Therefore, oil-based drilling fluids are the first choice when drilling in highly active and easily collapsed formations. However, oil-based drilling fluids have problems such as high preparation costs, unfavorable drilling operations, serious losses during lost circulation, and high pressure for post-treatment of cuttings. These s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12C07H15/04
CPCC07H15/04C09K8/12
Inventor 司西强王中华樊好福吕跃滨雷祖猛谢俊
Owner 中石化石油工程技术服务有限公司
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