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Method for preparing cement slurry thixotropic agent of plugging oil well

A technology of oil well cement slurry and thixotropic agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems affecting the plugging performance of thixotropic agent, the decrease of thixotropic performance, and the increase of water loss, and achieve viscosity Effects of enhancing, reducing water loss, and enhancing viscosity

Inactive Publication Date: 2019-01-11
方建波
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is that the thixotropic performance of the current cement slurry thixotropic agent decreases under high temperature environment, and the water loss increases after the cement slurry is added with the thixotropic agent. The glue process is greatly affected by the high salinity of the cement slurry, which makes the jelly formed by acrylamide in the cement slurry looser and affects the plugging performance of the thixotropic agent. It provides a plugging oil well cement slurry The preparation method of thixotropic agent

Method used

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  • Method for preparing cement slurry thixotropic agent of plugging oil well

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example 1

[0026] Methyl methacrylate and styrene are mixed in a mass ratio of 2:3 to obtain a mixed monomer. In parts by weight, 40 parts of a mixed monomer, 5 parts of a mass fraction of 30% sodium hydroxide solution and 30 Add one part of deionized water into a three-necked flask with a stirrer and a ventilation tube, heat up to 75°C, feed nitrogen, start the agitator, stir at a speed of 200r / min, add 1 part of potassium thiosulfate to the three-necked flask, React for 1.5h to obtain seed emulsion; in parts by weight, after cooling the above-mentioned three-necked flask to 68°C, add 30 parts of butyl acrylate, 20 parts of methyl methacrylate, 2 parts of potassium thiosulfate, 20 parts of Parts of sodium carbonate solution with a mass fraction of 25%, 3 parts of sodium lauryl sulfate, stirred and reacted for 3 hours, heated to 80°C, then incubated for 30 minutes, cooled to room temperature naturally, and discharged to obtain a soap-free emulsion, which is set aside; by weight By counti...

example 2

[0028] Methyl methacrylate and styrene are mixed in a mass ratio of 2:3 to obtain a mixed monomer. In parts by weight, 45 parts of a mixed monomer, 6 parts of a mass fraction of 30% sodium hydroxide solution and 35 Add one part of deionized water into a three-necked flask with a stirrer and a ventilation tube, heat up to 77°C, feed nitrogen, start the agitator, stir at a speed of 225r / min, add 2 parts of potassium thiosulfate to the three-necked flask, React for 1.7h to obtain seed emulsion; in parts by weight, after cooling the above-mentioned three-necked flask to 70°C, add 35 parts of butyl acrylate, 25 parts of methyl methacrylate, 3 parts of potassium thiosulfate, 23 parts of Parts of sodium carbonate solution with a mass fraction of 25%, 4 parts of sodium lauryl sulfate, stirred and reacted for 3 hours, heated to 83°C, then incubated for 35 minutes, cooled to room temperature naturally, and discharged to obtain a soap-free emulsion for subsequent use; parts by weight By ...

example 3

[0030] Methyl methacrylate and styrene are mixed in a mass ratio of 2:3 to obtain a mixed monomer. In parts by weight, 50 parts of a mixed monomer, 7 parts of a mass fraction of 30% sodium hydroxide solution and 40 Add one part of deionized water into a three-necked flask with a stirrer and a ventilation tube, heat up to 78°C, feed nitrogen, start the agitator, stir at a speed of 250r / min, add 3 parts of potassium thiosulfate to the three-necked flask, React for 2.0 hours to obtain seed emulsion; in parts by weight, after cooling the above-mentioned three-necked flask to 72°C, add 40 parts of butyl acrylate, 30 parts of methyl methacrylate, 4 parts of potassium thiosulfate, 25 parts of Parts of sodium carbonate solution with a mass fraction of 25%, 5 parts of sodium lauryl sulfate, stirred and reacted for 4 hours, heated to 85°C, then incubated for 40 minutes, cooled to room temperature naturally, and discharged to obtain a soap-free emulsion, which is set aside; by weight Add...

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Abstract

The invention relates to the technical field of preparation of an oil well cement admixture, and concretely relates to a method for preparing a cement slurry thixotropic agent of a plugging oil well.According to the invention, a soap-free latex film reduces the water loss of a cement slurry and improves the high temperature thixotropic property of the cement slurry, the corn starch is reacted with epichlorohydrin to obtain a graft polymer, coconut oil is reacted with ethylene glycol monobutyl ether under alkaline condition to obtain fatty acid salt, the emulsifying property of the thixotropicagent is increased, so that the plugging performance of the thixotropic agent is increased, the sodium silicate reacts with calcium ions in the cement slurry to form a calcium silicate hydrate C-S-Hcore, and a hydration induction period of the cement slurry is completed in advance, on one hand, a pH value of the polymer is controlled, the hydrolysis rate is reduced, and on the other hand, the physical crosslinking point of a copolymer is formed, the strength of the polymer is enhanced, the flowing resistance of fluid is increased, the anti-gas channeling ability of cement slurry can be increased, and the method has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of preparation of oil well cement admixture, in particular to a preparation method of a thixotropic agent for plugging oil well cement slurry. Background technique [0002] Thixotropic agent is a new type of cement concrete admixture researched and developed in recent years. The purpose of adding this admixture is to increase the cohesion and cohesive force of cement cementitious materials, reduce the separation rate of material components, and improve the uniformity. properties and properties of hardened products. [0003] Thixotropic agent, also known as anti-sagging agent, is an additive that can cause the colloid to produce "thixotropy". Thixotropy is an important property of the liquid phase system, which directly affects the appearance, construction performance and storage stability of the liquid phase system, and different liquid phase systems have different requirements for thixotropic agents. Thix...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F220/56C08F220/58C08F220/18C08F220/14C08F212/08C09K8/467
CPCC08F285/00C09K8/467C08F220/56
Inventor 方建波章红英赵金晶
Owner 方建波
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