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Abstract

The present invention relates to the technical field of petroleum drilling. An intermediate product of a reservoir protecting agent, a reservoir protecting agent, a preparing method and use thereof, a drilling fluid and use thereof are disclosed. The intermediate product of a reservoir protecting agent is made of raw materials comprising acrylamide, a cationic monomer, a cross-linking agent, an initiator, a toughening material and water, and based on the raw materials of 100 parts by weight, the use amounts of the acrylamide, the cationic monomer, the cross-linking agent, the initiator and the toughening material are respectively 8-30, 1-10, 0.01-0.5, 0.01-0.1, 5-25 parts by weight. The reservoir protecting agent includes the intermediate product of the present invention, base, salt, and water, and based on the reservoir protecting agent of 100 parts by weight, the use amounts of the intermediate product, base, and salt are respectively 5-40, 1-10, and 1-12 parts by weight. The reservoir protecting agent of the present invention has a good blocking effect and can improve the capability of the drilling fluid to protect the reservoir, enhance the capability of the drilling fluid to stabilize well walls.

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First Claim