Drilling fluid filtrate reducer with natural gas hydrate inhibiting effect

A technology of fluid loss control agent and inhibition effect, which is applied in the field of copolymers of N-alkenyl caprolactam and N-substituted acrylamide, which can solve the problems of complex treatment agents and achieve the effect of reducing costs

Inactive Publication Date: 2015-03-25
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of gas hydrate inhibitors is the most simple and easy way, but the treatment agents in drilling fluid are complex, and the addition of new treatment agents may change the properties or efficacy of one or more of the treatment agents

Method used

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  • Drilling fluid filtrate reducer with natural gas hydrate inhibiting effect
  • Drilling fluid filtrate reducer with natural gas hydrate inhibiting effect

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Experimental program
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Effect test

preparation example Construction

[0012] The preparation of the copolymer used in the present invention follows the traditional chemical method: adding activated carbon to the monomers respectively, utilizing its adsorption to remove the polymerization inhibitor, and then filtering to obtain pure monomers. Add the two monomers, the initiator ammonium persulfate and solvent water into a four-necked bottle, seal it, replace the air with nitrogen, heat to 60°C, and keep it under nitrogen protection during the reaction for 3 hours. A viscous product is obtained, which is vacuum-dried and pulverized to obtain a copolymer powder.

[0013] The test of the hydrate inhibition performance of fluid loss control agent mainly includes reaction kettle, constant temperature air bath, magnetic coupling stirring and pressure and temperature measurement system, vacuum pump, data acquisition system, etc. The reaction kettle is a stainless steel kettle with a volume of 1.02 liters, and the maximum working pressure can reach 35MPa...

Embodiment 1

[0016] Both R and R1 are H, and the copolymer is synthesized according to n:m=1, and the weight average molecular weight is controlled at 1,000,000. The copolymer is configured into a 200g aqueous solution according to a mass concentration of 0.5%, and it is loaded into a reactor with stirring, and the experiment starts The pressure is 8.5MPa, the experimental gas is the mixed gas provided by Foshan Gas Plant (91.86% methane, 5.04% ethane and 3.1% propane), the reaction temperature is maintained at 4.0°C, and no hydrate is formed within 4000 minutes. With this concentration of copolymer drilling fluid, the test fluid loss is 8ml.

Embodiment 2

[0018] R is a methyl group, R1 is a methyl group, and the copolymer is synthesized according to n:m=0.5, and the weight average molecular weight is controlled at 400,000. The copolymer is configured into a 200g aqueous solution according to a mass concentration of 1%, and is loaded into a stirred reactor. The initial pressure of the experiment was 10MPa, the experimental gas was the mixed gas provided by Foshan Gas Plant (91.86% methane, 5.04% ethane and 3.1% propane), the reaction temperature was maintained at 4.0°C, and no hydrate was formed within 5000 minutes. The tested fluid loss of the copolymer drilling fluid containing this concentration is 5ml.

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Abstract

The invention relates to a copolymer of N-substituted acrylamide and N-vinyl caprolactam serving as a drilling fluid filtrate reducer with hydrate inhibition performance. The copolymer is made from vinyl acrylamide and N-alkyl caprolactam and is applied to a hydrate inhibitor and a filtrate reducer in the drilling fluid. The copolymer has the average molecular weight of 10000-2000000, the polymerization unit ratio is 0.1-10, the use mass concentration is 0.5-3 percent, and the use pressure is between 1MPa and 30MPa. According to the novel treatment agent disclosed by the invention, a natural gas hydrate inhibitor is combined with a filtrate reducer in a drilling fluid treatment agent, two functions are realized by virtue of one treatment agent, the cost of the drilling fluid is reduced, and the stability of the drilling fluid is guaranteed under the condition that the hydrate inhibition performance and filtrate loss reduction performance are improved.

Description

technical field [0001] The invention relates to a fluid loss control agent for drilling fluid with hydrate inhibiting performance, specifically a copolymer of N-alkenyl caprolactam and N-substituted acrylamide is used as a fluid loss reducer for drilling fluid with hydrate inhibiting performance . Background technique [0002] Drilling fluid is one of the important means of serving drilling engineering. From the late 1990s, the main function has changed from maintaining wellbore stability and ensuring safe drilling to how to use drilling fluid as a means to achieve the purpose of protecting oil and gas layers and producing more oil. The successful completion of a well and its cost depend in part on the type and properties of the drilling fluid. Therefore, it is very necessary to properly select the drilling fluid and the drilling fluid treatment agent to maintain the proper performance of the drilling fluid. [0003] During the drilling process, due to the pressure differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F220/56C08F220/54C08F226/06
CPCC09K8/035C08F220/54C08F220/56C08F226/06
Inventor 唐翠萍梁德青何勇赵翔涌李栋梁
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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