Grafted starch thickening agent copolymerization association compound and preparation method thereof

A technology of grafted starch and associated compounds, which is applied in the field of drilling fluid polymers and its preparation, can solve the problem of no obvious improvement in salt and calcium resistance, and achieve high temperature and salt resistance
CN106608975AActive Publication Date: 2017-05-03CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2017-05-03

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Abstract

The invention discloses a grafted starch thickening agent copolymerization association compound and a preparation method thereof. The copolymerization association compound contains a structural unit A, a structural unit B, a structural unit C and a structural unit D, the structural unit A is acrylamide, the structural unit B is an amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate (DMAPS), the structural unit C is an ion association body of the structural unit B and cationic polyamine, and the structural unit D is starch; and based on the total amount of the copolymerization association compound, the content of the acrylamide is 6-45wt%, the total content of the amphoteric monomer methacryloyloxyethyl-N,N-dimethylpropanesulfonate is 5-35wt%, the content of the cationic polyamine is 2-30wt%, and the content of the starch is 5-35wt%. Temperature resistance of the thickening agent prepared by the method can reach 150 DEG C, anti-NaCl concentration is saturated, and anti-CaCl2 concentration reaches 20%; and meanwhile, excellent shale inhibition performance and filtrate loss controllability are furthermore achieved.
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Description

technical field

[0001] The invention relates to a polymer used in drilling fluid in the oil drilling process and a preparation method thereof, in particular to a high-temperature-resistant and calcium-resistant grafted starch tackifier for drilling fluid and a preparation method thereof. Background technique

[0002] During the drilling process, in order to ensure that the drilling fluid has a high viscosity and good rheology under low solid phase, it is usually necessary to add a viscosifier to increase the viscosity of the drilling fluid. Drilling fluid viscosifiers are all water-soluble high molecular polymers with long molecular chains. In addition to the viscosifying effect, viscosifiers often also serve as shale inhibitors (coating agents), fluid loss reducers and flow control agents. type improver, etc. Therefore, the use of viscosifiers is often beneficial to improving the rheological properties of drilling fluids, and is also beneficial to the stability of wellbore...

Claims

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