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Five-membered copolymer fluid loss agent and preparation method thereof

A technology of fluid loss reducer and copolymer, applied in chemical instruments and methods, drilling compositions, etc., to achieve the effects of good reproducibility, inhibition of hydration swelling, and enhanced adsorption

Inactive Publication Date: 2010-12-29
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used fluid loss control agents include latex, modified natural polymer fluid loss control agents such as modified cellulose, lignin, lignite, and tannin, non-ionic, polyamine, etc., such as polyvinyl alcohol, polyethylene oxide, and PVP. Cationic, hydrolyzed polyacrylonitrile, hydrolyzed polyacrylic acid, polysulfonate and other anionic fluid loss additives, these fluid loss additives can no longer fully meet the requirements of the current drilling fluid technology

Method used

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  • Five-membered copolymer fluid loss agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0016] A kind of pentapolymer fluid loss reducer and preparation method thereof, it comprises the steps:

[0017] 1) Dissolve 0.041mol of acrylic acid, 0.032mol of 2-acrylamide-2-methylpropanesulfonic acid, and 0.025mol of methacryloyloxyethyltrimethylammonium chloride in 70mL of water, and then use the mass percentage concentration of 20% sodium hydroxide solution adjusts the pH value of the system, the pH value is 7, and the mixed solution G is obtained;

[0018] 2) In the mixed solution G, add 0.208 mol of acrylamide and 0.010 mol of acrylonitrile to obtain a mixed solution H, and the mass percentage concentration of the mixed solution H is 30%;

[0019] 3) Heating the mixed solution H to 50° C., adding the initiator ammonium persulfate and sodium bisulfite successively, the molar ratio is 1:1, the amount of the initiator is 1.6% of the total mass of the monomer, and reacting for 10 minutes under constant stirring, Observe the viscosity, and let it stand in a constant temp...

Embodiment 2

[0023] A kind of pentapolymer fluid loss reducer and preparation method thereof, it comprises the steps:

[0024] 1) Dissolve 0.047mol of acrylic acid, 0.032mol of 2-acrylamide-2-methylpropanesulfonic acid, and 0.025mol of dimethyl diallyl ammonium chloride in 70mL of water, and then use 20% mass percent Sodium hydroxide solution adjusts the pH value of the system, and the pH value is 7 to obtain mixed solution G;

[0025] 2) In the mixed solution G, add 0.199 mol of acrylamide and 0.012 mol of acrylocyanide to obtain a mixed solution H, and the mass percentage concentration of the mixed solution H is 30%;

[0026] 3) Heating the mixed solution H to 50° C., adding the initiator ammonium persulfate and sodium bisulfite successively, the molar ratio is 1:1, the amount of the initiator is 1.6% of the total mass of the monomer, and reacting for 10 minutes under constant stirring, Observe the viscosity, and let it stand in a constant temperature water bath for 3 hours;

[0027] 4...

Embodiment 3

[0030] A kind of pentapolymer fluid loss reducer and preparation method thereof, it comprises the steps:

[0031] 1) Dissolve 0.043mol of acrylic acid, 0.033mol of 2-acrylamide-2-methylpropanesulfonic acid, and 0.026mol of methacryloxyethyltrimethylammonium chloride in 70mL of water, and then use the mass percentage concentration of 20% sodium hydroxide solution adjusted the pH value of the system, the pH value was 8, and mixed solution G was obtained;

[0032] 2) In the mixed solution G, add 0.217 mol of acrylamide and 0.010 mol of acrylonitrile to obtain a mixed solution H, and the mass percentage concentration of the mixed solution H is 30%;

[0033] 3) Heating the mixed solution H to 45° C., adding the initiator ammonium persulfate and sodium bisulfite successively, the molar ratio is 1:1, the amount of the initiator is 1.0% of the total mass of the monomer, and reacting for 10 minutes under constant stirring, Observe the viscosity, and let it stand in a constant temperat...

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Abstract

The invention relates to a five-membered copolymer fluid loss agent and a preparation method thereof, which is used for drilling fluid and completion fluid in the drilling engineering of oil and gas fields. The five-membered copolymer fluid loss agent can improve the high-temperature resistant performance, performance for inhibiting shale expansion, salt tolerant performance and the like for fluid loss agent. The technical scheme is as follows: the raw materials for preparing the fluid loss agent comprise acrylamide A, acrylonitrile B, crylic acid C, 2-acrylamide-2-methylpropanesulfonic acid D and vinyl ammonium salt cation monomer E. Water is served as solvent, NaOH solution is pH value modifier, and (NH4)2S2O8 and NaHSO3 are served as initiators. C, D and E are dissolved in water according to the molar ratio of 13-15:10:8, and NaOH solution is used for regulating pH to 6-8; then, A and B are added at the molar ratio of 66-63:3-4; mixed liquor is heated to 40-55 DEG C; the initiators are added to be stirred for 10min; the obtained mixture stands and reacts at the constant temperature for 3-5h; finally, alcohol is adopted for purifying; and the product is cut, prilled and dried to obtain the five-membered copolymer fluid loss agent. The five-membered copolymer fluid loss agent has good temperature resistant performance and salt tolerant performance. The method has high yield and can be used for drilling fluid and completion fluid.

Description

technical field [0001] The invention relates to a pentapolymer fluid loss reducer used in drilling fluid and completion fluid in oil and gas field drilling engineering and a preparation method thereof. Background technique [0002] With the increasingly complex formations encountered and the increase in the number of deep wells, special wells, ultra-deep wells and complex wells in various countries in the world, higher and higher requirements are placed on drilling fluid technology. Practice shows that the drilling fluid treatment agent is the key to ensure the excellent performance of the drilling fluid. In order to achieve safe and rapid drilling operations and higher comprehensive benefits, the drilling fluid is required to have appropriate fluid loss wall-building properties, rheological properties, stable wellbore walls, and Due to the high temperature and salt resistance functions, fluid loss control agents have become one of the drilling fluid treatment agents with th...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08F220/56
Inventor 马喜平刘健叶红超
Owner SOUTHWEST PETROLEUM UNIV
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