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Preparation method for modified polyacrylamide filtrate reducer for drilling fluid

A technology of polyacrylamide and fluid loss reducing agent, which is applied in the directions of drilling compositions, chemical instruments and methods, can solve the problems of low high temperature resistance and large filtration loss, and achieves good high temperature resistance and reduced filtration loss. The effect of small filter loss

Inactive Publication Date: 2016-03-02
宋介珍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned fluid loss control agents have the problems of low high temperature resistance and large filtration loss in actual use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1: Add 50g of acrylamide monomer, 5g of 1,3-butanediol diacrylate, 3g of ethylenethiourea, 3g of hydroxypropyl acrylate, 4g of cardanol, and trimethylolpropane triacrylic acid into the reactor 5g of ester, 3g of maleic anhydride, 2g of polyvinyl butyral, 5g of chain extender 1,4-butanediol, 400g of water, 2g of crosslinking agent acrylonitrile, 5g of sorbitan monopalmitate, Catalyst Dibutyltin dilaurate 5g, mix evenly, add phosphoric acid to adjust the pH value of the system to 4-6, pass helium gas to remove dissolved oxygen in the reaction system;

[0022] In the second step, the temperature of the reaction system obtained in the first step is lowered to 5° C., then 5 g of initiator azobisisobutylamidine hydrochloride is added, and the temperature is raised to 50° C. for polymerization;

[0023] Step 3: Take out the jelly obtained from the reactant obtained in Step 2, granulate, dry, and pulverize to obtain a modified polyacrylamide fluid loss reducer.

Embodiment 2

[0025] Step 1: Add 60g of acrylamide monomer, 10g of 1,3-butanediol diacrylate, 7g of ethylene thiourea, 6g of hydroxypropyl acrylate, 7g of cardanol, and trimethylolpropane triacrylic acid into the reactor 8g of ester, 4g of maleic anhydride, 8g of polyvinyl butyral, 10g of chain extender 1,4-butanediol, 700g of water, 8g of crosslinking agent acrylonitrile, 8g of sorbitan monopalmitate, Catalyst Dibutyltin dilaurate 8g, mix well, add phosphoric acid to adjust the pH value of the system to 4-6, pass helium gas to remove dissolved oxygen in the reaction system;

[0026] In the second step, the temperature of the reaction system obtained in the first step is lowered to 15° C., then 8 g of initiator azobisisobutylamidine hydrochloride is added, and the temperature is raised to 60° C. for polymerization;

[0027] Step 3: Take out the jelly obtained from the reactant obtained in Step 2, granulate, dry, and pulverize to obtain a modified polyacrylamide fluid loss reducer.

Embodiment 3

[0029] Step 1: Add 55g of acrylamide monomer, 7g of 1,3-butanediol diacrylate, 5g of ethylenethiourea, 5g of hydroxypropyl acrylate, 5g of cardanol, and trimethylolpropane triacrylic acid into the reactor 6g of ester, 3g of maleic anhydride, 5g of polyvinyl butyral, 7g of chain extender 1,4-butanediol, 600g of water, 5g of crosslinking agent acrylonitrile, 6g of sorbitan monopalmitate, Catalyst Dibutyltin dilaurate 6g, mix evenly, add phosphoric acid to adjust the pH value of the system to 4-6, and pass helium gas to remove dissolved oxygen in the reaction system;

[0030] In the second step, the temperature of the reaction system obtained in the first step is lowered to 8° C., then 6 g of initiator azobisisobutylamidine hydrochloride is added, and the temperature is raised to 55° C. for polymerization;

[0031] Step 3: Take out the jelly obtained from the reactant obtained in Step 2, granulate, dry, and pulverize to obtain a modified polyacrylamide fluid loss reducer.

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Abstract

The invention relates to a preparation method for a modified polyacrylamide filtrate reducer for drilling fluid, and belongs to the technical field of petroleum drilling oilfield chemistry high-molecular polymers. The preparation method comprises the following steps: adding acrylamide monomer, 1,3-butylene glycol diacrylate, ethylene thiourea, hydroxy-propyl acrylate, cardanol, trimethylol propyl triacrylate, maleic anhydride, polyvinyl butyral, a chain extender, water, a crosslinking agent, a surfactant and a catalyst into a reactor, uniformly mixing, adding the mixture into a phosphoric acid adjusting system to adjust the pH value to 4-6, feeding inert gas to remove dissolved oxygen in the reaction system; cooling the reaction system, adding an initiating agent, and warming up for polymerization reaction; taking out the obtained jelly reactant, and conducting granulation, stoving and smashing so as to obtain the modified polyacrylamide filtrate reducer. The provided modified polyacrylamide filtrate reducer has the advantages of being good in high-temperature resistance and small in filtrate reduction loss.

Description

technical field [0001] The invention relates to a preparation method of a modified polyacrylamide fluid loss reducer used in drilling fluid, and belongs to the technical field of chemical high molecular polymers in petroleum drilling and oilfields. Background technique [0002] In the oil and gas drilling construction process, in order to achieve the purpose of wellbore stability and oil and gas layer protection, adding fluid loss reducer to reduce drilling fluid fluid loss is a must-take measure. Most fluid loss control agents are water-soluble polymer compounds, and commonly used fluid loss control agents include carboxymethyl cellulose, resins, acrylamides, and modified starches. However, while these fluid loss reducers reduce the fluid loss, they often cause the viscosity of the drilling fluid to increase significantly, making the fluidity of the drilling fluid worse, which will increase the number of flushing of the drilling fluid, resulting in waste of the drilling f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F222/14C08F220/28C08F222/06C09K8/035
CPCC08F220/56C09K8/035C08F222/102C08F222/103C08F220/281C08F222/06
Inventor 宋介珍
Owner 宋介珍
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