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Preparation method of multielement silicon water based well drilling liquid

A drilling fluid and silicon water-based technology, applied to drilling equipment, etc., can solve problems such as high interface permeability, poor cementing quality, and poor hydrophilicity, so as to improve cementation strength, channeling resistance, and mud cake strength Effect

Inactive Publication Date: 2003-04-16
DAQING PETROLEUM ADMINISTRATION
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of the existing drilling fluid and the two interfaces, such as poor hydrophilicity, high interface permeability, low strength, and poor cementing quality, the present invention provides a method for preparing a multi-component silicon water-based drilling fluid. The method is to use the drilling fluid The chemical properties of the two interfaces can be used to improve the bonding strength of the two interfaces, which can greatly improve the cementing quality

Method used

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Experimental program
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preparation example Construction

[0008] The preparation method of the multi-silicon water-based drilling fluid is as follows: the base slurry formed by 4.5-5.5 parts of bentonite, 0.15-0.25 parts of anhydrous sodium carbonate and 94.75-94.85 parts of clear water is prepared by adding 2-7 parts of silanol binder 1-6 parts of carboxymethyl cellulose and 2-5 parts of film-forming agent to make multi-silicon solution, add 1.0-2.0 parts of multi-silicon solution to 100 parts of base slurry, and then add organic silicon humic acid 0.5-1.0 parts of potassium and 0.5-1.0 parts of sulfonated tannin extract, just stir evenly; and the molecular formula of the silanol binder is Na 2 O nSiO 2 +3K 2 O mSiO 2 , wherein n=1.5-2.5, m=1.5-3.5; the molecular formula of carboxymethylcellulose is (C 6 h 9 o 4 ·OCH 2 COOH) n , where n=230-260; the molecular formula of the film-forming agent is CH 3 Si(OH)OHa. The specific preparation scheme of polysilicon solution is as follows:

[0009] Add 1.0-2.0 parts of the above ...

Embodiment 1

[0012] Example 1. During the construction of Well Xing 1-320-18 in Daqing, the multi-component silicon drilling fluid prepared in Scheme 1 in the above table was used. The secondary sound change was reduced by 1.20% compared with the primary sound change. The rheological property was reasonable and the inhibition was strong. The well diameter is regular, 98.1% of the well intervals are completely cemented at the first and second interfaces, the construction process is simple, the cost is low, the drilling fluid mud cake is thin, and the cementation strength of the second interface is high.

Embodiment 2

[0013] Example 2. During the construction of Well Xing 1-332-22 in Daqing, the multi-silicon drilling fluid prepared in Scheme 2 of the above table was used, and the secondary sound change decreased by 0.77% compared with the primary sound change. It is not because the content of multi-silicon is more The more the better, but in this program is the best, the cementing quality is in the best state.

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Abstract

A water-base polysilicon drilling liquid for oil field is prepared through mixing silanol adhesive, carboxymethyl cellulose and filming agent to obtain polybasic silicon solution, adding it to basic slurry, adding organosilicon potassium humate and sulfonated tannin extract, and stirring to uniformity. Its advantages are high well-concretion quality, low cost and high adhesion between interfaces.

Description

Technical field: [0001] The invention relates to a method for preparing drilling fluid used in oilfield drilling and cementing technology, and belongs to a method for preparing multi-component silicon water-based drilling fluid. Background technique: [0002] After drilling in the oil field, cementing operations need to be carried out at the first and second interfaces, and the quality of cementing and sealing directly affects the completion effect. The first interface cementing technology is relatively mature; the second interface of cementing mainly refers to the interface between the cement sheath outside the casing and the formation, which is mainly composed of the well wall, mud cake, cement sheath and their interfaces; the surrounding rock of the well wall is generally It is composed of mudstone and sandstone, and the mudstone and sandstone contain a certain amount of montmorillonite, illite, and kaolinite. Montmorillonite is unstable, while illite and kaolinite are st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 谢凤臣韩玉华孙晓宏
Owner DAQING PETROLEUM ADMINISTRATION
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