Acrylamide/2-acrylamido-2-methylpropane sulfonic acid sodium/cyclodextrin modified acrylamide (AM/AMPS-Na/MAM) copolymer and preparation method thereof

A technology of copolymer and concentration, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as the gap in the performance and maintenance of drilling fluids, and achieve the effects of simple and feasible preparation methods, mild reaction conditions, and good effects

Inactive Publication Date: 2011-09-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a gap between synthetic polymers and the maintenance of drilling fluid performance under ultra-high temperature conditions

Method used

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  • Acrylamide/2-acrylamido-2-methylpropane sulfonic acid sodium/cyclodextrin modified acrylamide (AM/AMPS-Na/MAM) copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1 The preparation method of AM / AMPS-Na / MAM copolymer fluid loss control agent.

[0011] Add 200 mL of the prepared 0.1 g / L acrylamide AM aqueous solution into a 500 mL three-necked beaker, and then add 10 mL of the cyclodextrin-modified acrylamide MAM aqueous solution with a concentration of 0.4 g / L and 0.5 g / L 2- Acrylamido-2-methylpropanesulfonate sodium AMPS-Na aqueous solution 21mL; then add 1mL disodium edetate chelating agent with a concentration of 0.3g / L and potassium persulfate oxidant with a concentration of 0.5g / L in sequence 1mL and a concentration of 1.0g / L sodium bisulfite reducing agent 0.5mL. After fully stirring and mixing uniformly on a magnetic stirrer, nitrogen protection deoxidizes, and reacts at 40-50° C. for 5-6 hours to obtain a transparent gel-like product AM / AMPS-Na / MAM copolymer.

[0012] Measure the intrinsic viscosity of AM / AMPS-Na / MAM copolymer according to the standard described in GB12005.1-89, then measure the molecular weight o...

Embodiment 2

[0013] Example 2 The fluid loss control effect of AM / AMPS-Na / MAM copolymer.

[0014] In order to evaluate the fluid loss reduction effect of AM / AMPS-Na / MAM copolymer at a higher temperature, the base slurry was prepared according to the national standard GB / T16783-1997. That is, add 2.5 g of anhydrous sodium carbonate and 20 g of bentonite to 500 mL of deionized water, stir at a high speed for 20 min, and then keep it sealed for 24 h to obtain a freshwater base slurry. Similarly, add 4% NaCl to 4% fresh water base slurry, stir at high speed for 20 minutes, and then leave it in a sealed container for 24 hours to obtain a salt water base slurry; Set aside for 24 hours to obtain a saturated brine base slurry; in 500mL deionized water, add 22.5g NaCl, 2.5g anhydrous calcium chloride, 6.5g magnesium chloride hexahydrate, 75g calcium bentonite and 4.5g anhydrous sodium carbonate, stir at high speed for 20min, then seal and statically Set aside for 24 hours to obtain a composite bri...

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Abstract

The invention discloses acrylamide / 2-acrylamido-2-methylpropane sulfonic acid sodium / cyclodextrin modified acrylamide (AM / AMPS-Na / MAM) copolymer serving as a fluid loss reducer for drilling fluid in oilfield, and a preparation method thereof, which can solve the problems of short cement paste thickening time, failure of an additive and high filter loss due to strata pressure and temperature rise. The technical scheme is that: the copolymer is prepared by polymerizing 83 to 85 percent of acrylamide AM, 15 to 16 percent of 2-acrylamido-2-methylpropane sulfonic acid sodium AMPS-Na and 1 to 2 percent of cyclodextrin modified acrylamide MAM. The preparation method comprises the following steps of: adding aqueous solution of the AM, solution of the MAM and solution of the AMPS-Na into a reaction container; adding ethylene diamine tetraacetic acid, potassium peroxydisulfate and sodium hydrogensulfite; and stirring uniformly, and reacting at the temperature of between 40 and 50DEG C for 5 to 6 hours under the protection of nitrogen to obtain the AM / AMPS-Na / MAM copolymer. The AM / AMPS-Na / MAM copolymer serving as a drilling fluid treating agent has high thermal stability, high temperature resistance, and better fluid loss reducing effect; the preparation method is simple and practicable, and the reaction conditions are mild; and the AM / AMPS-Na / MAM copolymer is used as the drilling fluid treating agent in the oilfield.

Description

technical field [0001] The invention relates to an AM / AMPS-Na / MAM copolymer used as a fluid loss reducer in drilling fluids in the oil and gas industry and a preparation method. Background technique [0002] In view of the fact that oil and gas exploration and development are developing to the deep, drilling encounters more and more complex formations, and drilling and completion are facing more and more difficulties, scholars at home and abroad focus on the needs of ultra-high temperature water-based drilling fluids in the field of treatment agents for oilfields. A series of work has been carried out. The focus is on the modification of acrylamide copolymers, introducing new monomers to copolymerize with acrylamide to prepare various fluid loss control agents. However, there is still a gap between the synthetic polymer and the maintenance of drilling fluid performance under ultra-high temperature conditions. For this reason, the present invention adopts monomers such as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08B37/16C09K8/035
Inventor 邹长军葛菊韩佳婷邹慧慧李超成陈小蓉
Owner SOUTHWEST PETROLEUM UNIV
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