Water-based viscosity-increasing and shearing agent for drilling fluid and preparation method thereof

A water-based, drilling fluid technology, applied in the field of drilling fluid water-based viscosity-increasing and shearing agent and its preparation, can solve the problems of insufficient temperature resistance stability, insufficient dynamic-plastic ratio, and narrow application range, etc., to achieve excellent growth The effect of sticking and cutting performance and temperature resistance, excellent compatibility

Active Publication Date: 2016-05-18
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the existing drilling fluid viscosity increasing and shearing agent that the kinetic-plastic ratio is not high enough, the application range is narrow and / or the temperature resistance stability is not good enough, and a water-based drilling fluid viscosity increasing and shearing agent is provided. The preparation method and the water-based viscosity-increasing and shear-increasing agent for drilling fluid prepared according to the preparation method, the water-based viscosity-increasing and shear-increasing agent for drilling fluid of the present invention has excellent viscosity-increasing and shearing performance, temperature resistance and system applicability, Its excellent viscosity-increasing and cutting-increasing performance is specifically manifested as: it can make the drilling fluid system obtain a higher dynamic-plastic ratio, optimize the drilling fluid flow pattern, increase the dynamic shear force of the system, and enhance the rock-carrying ability of the system

Method used

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  • Water-based viscosity-increasing and shearing agent for drilling fluid and preparation method thereof
  • Water-based viscosity-increasing and shearing agent for drilling fluid and preparation method thereof

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preparation example Construction

[0017] The invention provides a preparation method of a water-based viscosity-increasing and shearing agent for drilling fluid, the method comprising the following steps:

[0018] (1) Dissolve and mix the anionic monomer, nonionic monomer and cationic monomer in water under stirring;

[0019] (2) Adjust the pH value of the mixed solution obtained in step (1) to 5-10, and continue stirring;

[0020] (3) Add oxidizing agent, reducing agent and azo initiator to the mixture obtained in step (2), and react under stirring.

[0021] In step (1), the inventors of the present invention found that by blending anionic monomers, nonionic monomers and cationic monomers in a certain ratio, the viscosity-increasing performance, temperature resistance performance and system applicability can be obtained better product. The inventors of the present invention have found through a large number of tests that the amount ratio of the anionic monomer, the nonionic monomer and the cationic monomer ...

Embodiment 1

[0035] (1) Mix water, benzenesulfonic acid, acrylamide, and dimethylaminoethyl methacrylate at a mass ratio of 7000:600:500:200 at room temperature, and stir for 25 minutes at a stirring speed of 400 r / min;

[0036] (2) Adjust the pH value of the solution obtained in step (1) to 8, and continue stirring for 40 minutes at a stirring speed of 350 r / min under a water bath condition of 35° C.; then

[0037] (3) Add ammonium persulfate, sodium bisulfite and azobisisobutyronitrile successively in a mass ratio of 2:4:2, and stir and react with a stirring speed of 300r / min for 4 hours, wherein the weight of the azo initiator is 0.5% by weight of the solid raw material gross weight in the step (1);

[0038] (4) Dry the mixture obtained in step (3) at 90° C. for 12 hours, and then grind it into a powder with an average particle size of about 60 mesh, which is the final product.

Embodiment 2

[0040] (1) Mix water, acrylic acid, acrylamide, and dimethyl diallyl ammonium chloride at normal temperature in a mass ratio of 7000:550:550:250, and stir for 20 minutes at a stirring speed of 350 r / min;

[0041] (2) Adjust the pH value of the solution obtained in step (1) to 7, and continue stirring for 30 minutes at a stirring speed of 300 r / min under a water bath condition of 30 ° C; then

[0042] (3) Potassium persulfate, sodium bisulfite and azobisisoheptanonitrile were added successively in a mass ratio of 1:3:1, and stirred and reacted for 3 hours with a stirring speed of 250r / min, wherein the weight of the azo initiator was 0.2% by weight of the solid raw material gross weight in the step (1);

[0043] (4) Dry the mixture obtained in step (3) at 85° C. for 16 hours, and then grind it into a powder with an average particle size of about 80 mesh, which is the final product.

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Abstract

The invention relates to the field of drilling fluids, and discloses a preparation method of a water-based tackifying and shear strength improving agent for drilling fluids. The method comprises the following steps: 1, dissolving an anionic monomer, a nonionic monomer and a cationic monomer in water under stirring, and mixing; 2, adjusting the pH value of a mixed solution obtained in step 1 to 5-10, and continuously stirring; and 3, adding an oxidizing agent, a reducing agent and an azo initiator into a mixture obtained in step 2, and reacting under stirring. The water-based tackifying and shear strength improving agent for drilling fluids has the advantages of excellent tackifying and shear strength improving performances, excellent temperature resistance and excellent system applicability, and the excellent tackifying and shear strength improving performances of the agent allow a drilling fluid system to have a high dynamic plastic ratio, the drilling fluid flow pattern to be well optimized, the dynamic shear force of the system to be improved and the cuttings carrying ability of the system to be enhanced.

Description

technical field [0001] The invention relates to a preparation method of a water-based viscosity-increasing and shear-increasing agent for drilling fluid and a water-based viscosity-increasing and shear-increasing agent for drilling fluid prepared according to the preparation method. Background technique [0002] Extended-reach wells have the advantages of controlling oil-bearing area in a wide range, increasing oil and gas recovery, reducing oilfield development costs, etc., and have significant economic and social benefits. Therefore, extended-reach wells have become one of the most effective means for developing marginal oilfields. In recent years, with the increase in the number of extended-reach wells drilled in highly deviated wells, higher requirements have been placed on the lithology of drilling fluids. [0003] Poor wellbore cleaning effect will increase the drilling torque and friction. Therefore, under the conditions of extended reach well, large well deviation, l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/34C08F220/06C08F226/02C08F220/58C08F222/38
Inventor 蒋官澄张领宇葛庆颖祁由荣邓正强叶龙云史赫
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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