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Grafted starch filtration loss reduction agent used for drilling fluid and preparation method thereof

A technology of grafting starch and fluid loss reducer, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of drilling fluid loss, wellbore collapse, contamination of reservoirs, etc., so as to increase production and protect oil and gas. layer, easily biodegradable effect

Inactive Publication Date: 2017-05-17
北京奥凯立科技发展股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the fluid loss of drilling fluid is too large, it will not only lead to the loss of drilling fluid, but also lead to the collapse of the well wall, pollution of the reservoir and other serious consequences

Method used

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  • Grafted starch filtration loss reduction agent used for drilling fluid and preparation method thereof
  • Grafted starch filtration loss reduction agent used for drilling fluid and preparation method thereof
  • Grafted starch filtration loss reduction agent used for drilling fluid and preparation method thereof

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Embodiment Construction

[0028] In order to clearly illustrate the solutions in the present invention, preferred embodiments are given below in detail.

[0029] The preparation method of grafted starch fluid loss reducer for drilling fluid in this embodiment is as follows:

[0030] (1) Weigh 11g starch, 4g acrylic acid, 8g acrylamide, 2g p-styrene sodium sulfonate and 0.8g ammonium persulfate respectively;

[0031] (2) Dissolve 11g of starch weighed in step (1) in 60g of deionized water, gelatinize at 70-75°C for 60 minutes, then cool down to 50-60°C to obtain gelatinized starch solution ;

[0032] (3) Add 4g of acrylic acid, 8g of acrylamide and 2g of sodium p-styrene sulfonate weighed in step (1) into 26 grams of deionized water and stir evenly and dissolve completely, then add the aqueous solution to the above gelatinized In the starch solution, stir for 10 minutes, then heat up to 65-70°C;

[0033] (4) Dissolve 0.8g of ammonium persulfate weighed in step (1) in 10g of deionized water, and slowl...

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Abstract

The invention discloses a grafted starch filtration loss reduction agent used for drilling fluid and a preparation method thereof. The grafted starch filtration loss reduction agent used for drilling fluid is composed of starch, acrylic acid, acrylamide and sodium p-styrenesulfonate in a mass ratio of (30-50):(10-25):(20-40):(5-15):(2-5). The prepared grafted starch filtration loss reduction agent used for drilling fluid has the advantages that molecular weight is greatly increased, so that the thermal stability and anti-pollution capacity of the grafted starch filtration loss reduction agent are greatly improved; and meanwhile, the grafted starch filtration loss reduction agent used for drilling fluid can enable the rheological property of the drilling fluid to be greatly improved.

Description

technical field [0001] The invention relates to a fluid loss reducer for drilling fluid and a preparation method thereof, in particular to a grafted starch fluid loss reducer for drilling fluid and a preparation method thereof. Background technique [0002] Drilling fluid is one of the most used oilfield chemicals, and fluid loss control agent is a very important additive in drilling fluid. When the fluid loss of drilling fluid is too large, it will not only lead to the loss of drilling fluid, but also lead to the collapse of the well wall and the pollution of the reservoir and other serious consequences. The addition of fluid loss reducer can significantly reduce the fluid loss of drilling fluid, maintain a stable well wall, and ensure fast and safe drilling. With the increase of oil extraction, many large oil fields have entered the period of deep oil extraction, and the difficulty of extraction is becoming more and more difficult; and environmental protection has attract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F251/00C08F220/06C08F220/56C08F212/14
CPCC08F251/00C09K8/035C08F220/06C08F220/56C08F212/14
Inventor 张金龙王欣柴奎徐云鹏杨晓岭张晓坡卢丙朵李国旗李本旭彭辉周文欣
Owner 北京奥凯立科技发展股份有限公司
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