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Preparation method of drilling fluid diluent compound methyl silicate

A technology of composite methyl silicate and methyl silicate, applied in the field of diluent, can solve the problems of unsatisfactory diluent effect, small application range, short action time, etc., and achieve low cost, good dilution effect and stable long time effect

Active Publication Date: 2013-04-24
DAQING HEZHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These diluents have certain limitations, such as chemical tannin extract, JN-A viscosity reducer, and sulfomethyl lignite are dispersed diluents, which are not suitable for use in polymer drilling fluids; sodium polyacrylate, XY27, etc. Substance diluent is suitable for polymer drilling fluid, but it is not resistant to high temperature, and the cost is high; SF260 is a high temperature resistant diluent, but its effect is relatively low when added in large amounts
The effects of these diluents are not ideal, and there are problems of low temperature resistance, short action time, high cost, and limited scope of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In a 1000ml reactor, add 400g of water, and then add 40g of sodium hydroxide. After the sodium hydroxide dissolves, the temperature rises to 70°C. The dissolution rate of silicic acid reaches over 95%, and the amount of water is properly replenished during the period to keep the content of sodium methyl silicate in the reactant at 18-20%, and the reaction generates sodium methyl silicate; transfer the reaction solution to a 2000ml reactor, Add 260g content 40-50% sodium water glass and 200g content 40% low molecular weight sodium polyacrylate in the 520g sodium methyl silicate that generates, add 1.5g dibutyltin dilaurate after fully stirring, at 100 ℃ reaction for 4 hours to obtain a finished liquid diluent product compound sodium methyl silicate with an active substance content of 30%.

Embodiment 2

[0019] In a 1000ml reactor, add 400g of water, and then add 120g of sodium hydroxide. After the sodium hydroxide dissolves, the temperature rises to 90°C. Add 240g of methyl silicic acid (calculated as 100%), and continue to heat up at 105°C. The dissolution rate of silicic acid reaches more than 95%. During this period, the amount of water should be supplemented appropriately to keep the content of sodium methyl silicate in the reactant up to 40%, and the reaction will generate sodium methyl silicate; transfer the reaction solution to a 2000ml reactor to generate Add 160g of 40-50% sodium water glass and 760g of 30% low-molecular-weight sodium polyacrylate to 760g of sodium methyl silicate, stir well, add 2g of dibutyltin dilaurate, and react at 105°C for 5 hours to obtain The active substance content is 35%. The finished liquid diluent product is compound sodium methyl silicate.

[0020] Material water glass can be sodium water glass or potassium water glass, also can use th...

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Abstract

The invention relates to a preparation method of a drilling fluid diluent compound methyl silicate. The method comprises the following steps: (1) preparing methyl silicate: adding water in a reactor, then adding alkali, heating to 70-90 DEG C after the alkali is dissolved, adding methyl silicic acid, continuing heating to 90-110 DEG C, and reacting to generate methyl silicate, wherein the weight ratio of water to methyl silicic acid to alkali is 1: 0.1-0.3: 0.2-0.6; and (2) preparing compound methyl silicate: adding sodium silicate and low molecular weight polyacrylate in generated methyl silicate, uniformly stirring sufficiently, adding an organic tin catalyst, and reacting for 3-5 hours at 90-120 DEG C to obtain a liquid diluent product compound methyl silicate with effective substance content of 25-40%. The drilling fluid diluent methyl silicate has the advantages of good diluting effect, low cost, wide application range, and long stabilization time, and can resist high temperature of more than 150 DEG C.

Description

technical field [0001] The invention relates to a diluent in the technical field of petroleum drilling, in particular to a method for preparing a drilling fluid diluent composite methyl silicate. Background technique [0002] During the drilling process, the drilled cuttings need to be carried out of the wellbore in order to continue the drilling process and avoid engineering accidents such as drill sticking. Drilling fluid is an essential working fluid for carrying cuttings, lubricating and cooling drilling tools, preventing borehole wall collapse, and balancing formation pressure. The performance of the drilling fluid directly affects the quality of drilling construction. The viscosity and shear force of the drilling fluid are one of the important indicators whether the drilling fluid can meet the drilling requirements. Therefore, the viscosity and shear force of the drilling fluid need to be controlled and made stable, which requires the use of drilling fluid thinners. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/14
Inventor 刘志文高玉华
Owner DAQING HEZHENG CHEM
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