Salt and high temperature resistant filtrate loss reducer for seawater-based drilling fluid and preparation method thereof

Abstract

Belonging to the technical field of chemical industry, the invention relates to a salt and high temperature resistant filtrate loss reducer for seawater-based drilling fluid and a preparation method thereof. The filtrate loss reducer is prepared from the following raw materials by mass fraction: 30%-60% of a polymer monomer, 0.05%-0.15% of a first initiator, 0.05%-0.15% of a second initiator, andthe balance water. The invention solves the problems that existing filtrate loss reducers cannot meet the requirement of maintaining good temperature resistance in an environment containing salt and calcium and the temperature and salt resistant filtrate loss reducer that can stabilize borehole walls and inhibit shale expansion and meet the drilling requirements of shallow sea areas in Peru is notdeveloped yet. The filtrate loss reducer provided by the invention has strong filtrate loss reducing properties, is suitable for various density conditions, especially for the filtrate loss reductionof high density drilling fluid, also has strong hardness resistance and strong inhibition properties, and can effectively control the filtrate loss reducing properties of drilling fluid under a hightemperature condition, improve the high temperature resistance and drilling efficiency of drilling fluid, and reduce the comprehensive cost of drilling fluid.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a salt-resistant and high-temperature fluid loss reducer for seawater-based drilling fluid and a preparation method thereof. Background technique [0002] The offshore area of ​​Talara in Peru and the adjacent offshore area of ​​Guayaquil in Ecuador are relatively similar in geology and landform, rich in oil and gas reserves, and are currently developing vigorously, but the formation is extremely unstable. Downhole accidents occur frequently. According to statistics of completed drilling data, downhole accidents The rate is as high as 14%, and drill stuck accidents occur from time to time. Usually high-pressure formations develop abnormally high temperature, and the temperature of the target layer is as high as 130°C to 200°C. In order to meet the requirements of safe drilling and consider the importance of marine environment protection, the offshore high-t...

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Problems solved by technology

[0004] The salt-resistant and high-temperature fluid loss reducer for seawater-based drilling fluid provided by the present invention and the preparation method thereof have the purpose of overcoming the problems in the prior art in the offshore area of ​​Talara, Peru and the adjacent offshore area of ​​Guayaquil, Ecuador. Due to the high temperature and the high salinity of formation water in the area, it is difficult for general treatment agents to meet the requirements of temperature resistance, salt resistance and calcium resistance at the same time, which cannot improve the stability of drilling fluid under high temperature conditions and effectively reduce fluid loss in the case of high concentration salt The second purpose is to overcome the problem that the fluid loss reducer in the prior art cannot meet the requirements of salt and calcium in the environment, and can still maintain good temperature resistance. Salt, at the same time can stabilize the borehole wall and inhibit the expansion of shale fluid loss control agent

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