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Temporary plugging agent for drilling fluid and preparation method of temporary plugging agent

A drilling fluid and temporary plugging agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor temperature resistance of temporary plugging agents, limited plugging effect, unfavorable reservoir protection, etc., and achieve easy acidification The effect of removing plugging, improving production capacity and protecting reservoir

Inactive Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a temporary plugging agent for drilling fluid in order to overcome the defects of the existing temporary plugging agent such as poor temperature resistance, limited plugging effect, fluorescence interference and unfavorable reservoir protection

Method used

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  • Temporary plugging agent for drilling fluid and preparation method of temporary plugging agent

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Embodiment 1

[0019] Mix 17.11g of 2-acrylamide-2-methylpropanesulfonic acid, 8.68g of acrylic acid, and 28.45g of acrylamide to form reaction mixture A, completely dissolve in water, adjust the pH value to 9.0 with sodium hydroxide solution, and prepare the total mass concentration 30% reaction mixture aqueous solution B; then add 3ml aqueous solution containing 0.0027g N,N-methylenebisacrylamide and 5ml aqueous solution containing 1.95g crystalline aluminum chloride, stir to dissolve and then add 13.56g treated seawater Paoolite solid powder, and then adjust the pH value to 9.0 with sodium hydroxide solution to obtain a stable white suspension; after 30min vacuum adsorption process, mix evenly, white suspension, 5ml 0.2349g potassium persulfate aqueous solution and 3ml 0.0905 Put the aqueous solution of sodium bisulfite together in a water bath to raise the temperature to 38°C, and then initiate polymerization under slow stirring. After 3 hours of reaction, the resulting product is cut int...

Embodiment 2

[0021] Mix 17.11g of 2-acrylamide-2-methylpropanesulfonic acid, 8.68g of acrylic acid, and 28.45g of acrylamide to form reaction mixture A, completely dissolve in water, adjust the pH value to 8.0 with sodium hydroxide solution, and prepare the total mass concentration 30% reaction mixture aqueous solution B; then add 3ml aqueous solution containing 0.0027g N, N-methylenebisacrylamide and 5ml aqueous solution containing 1.95g crystalline aluminum chloride respectively, stir to dissolve and then add 5.42g treated seawater Paoolite solid powder, and then adjust the pH value to 8.0 with sodium hydroxide solution to obtain a stable white suspension; after 80min vacuum adsorption process, mix evenly, white suspension, 5ml 0.2349g potassium persulfate aqueous solution and 3ml 0.0905 Put the aqueous solution of sodium bisulfite together in a water bath to raise the temperature to 38°C, and then initiate polymerization under slow stirring. After 3 hours of reaction, the resulting produ...

Embodiment 3

[0023] Mix 21.50g of 2-acrylamide-2-methylpropanesulfonic acid, 13.02g of acrylic acid, and 32.83g of acrylamide to form reaction mixture A, completely dissolve in water, adjust the pH value to 10.0 with sodium hydroxide solution, and prepare the total mass concentration 20% reaction mixture aqueous solution B; then add 3ml aqueous solution containing 0.0034g N, N-methylenebisacrylamide and 5ml aqueous solution containing 2.42g crystalline aluminum sulfate, stir and dissolve, then add 6.73g treated zeolite solid powder, and then adjust the pH value to 10.0 with sodium hydroxide solution to obtain a stable white suspension; after 30min vacuum adsorption process, mix evenly, mix the white suspension, 5ml 0.3890g potassium persulfate aqueous solution and 3ml 0.1498g sulfurous acid The sodium hydrogen aqueous solution is placed together in a water bath and the temperature is raised to 50°C, and then the polymerization is initiated under slow stirring. After 5 hours of reaction, the...

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Abstract

The invention relates to a temporary plugging agent for drilling fluid and a preparation method of the temporary plugging agent, which belong to the technical field of chemical drilling fluid treatment agents for oil fields. The temporary plugging agent for the drilling fluid is prepared by crosslinking polymerization reaction of 2-acrylamide-2-methyl propanesulfonic acid, acrylic acid, acrylamide, an inorganic material, an inorganic aluminium salt crosslinking agent, an N,N-methylene-bis-acrylamide organic crosslinking agent and an initiator under alkaline conditions. The inorganic material is introduced and the organic crosslinking agent and inorganic crosslinking agent are mixed for the crosslinking polymerization reaction; raw materials of the temporary plugging agent are rich and cheap, the temporary plugging agent is easy to produce industrially, has better high-temperature resistance (up to 150 DEG C), can effectively plug a well wall throat, reduces filtrate invasion to a reservoir, contributes to the well wall stabilization and has the effect of adjusting a flow pattern of the drilling fluid; and in addition, fluorescence interference does not exist, acidification and unplugging are easy, the stratum permeability can be recovered effectively, the productive capacity of a hydrocarbon reservoir is improved, and the reservoir can be protected.

Description

technical field [0001] The invention relates to a temporary plugging agent for drilling fluid and a preparation method thereof, belonging to the technical field of chemical drilling fluid treatment agents for oilfields. Background technique [0002] During the exploration and development of oil and gas reservoirs, the main causes of reservoir damage are two aspects: solid phase and liquid phase invasion. To reduce reservoir damage, it is necessary to reduce the entry of various solid and liquid phases into the reservoir. Adding temporary plugging agent to drilling fluid is one of the commonly used technical measures in actual production. With the continuous development of reservoir protection technology, there are many types of temporary plugging agents with different mechanisms of action and different scopes of application, but they all have limitations, mainly in: poor temperature and salt resistance, affecting drilling fluid performance, fluorescence interference , The ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/502C08F220/58C08F220/06C08F220/56
Inventor 甄剑武张麒麟孟丽艳张希红赵虎雷祖猛
Owner CHINA PETROLEUM & CHEM CORP
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