Method for preparing high-temperature resistant and salt resistant shear strength-improving agent for drilling fluid

Abstract

The invention relates to a method for preparing a high-temperature resistant and salt resistant shear strength-improving agent for drilling fluid, which comprises the following: (1) a step of preparing raw materials, in which 18.5 to 19.1 grams of alkali metal, 24.5 to 25 grams of starch, 13.0 to 13.5 grams of organic sodium salt and 0.1 to 0.2 grams of reducing initiator are added according to the addition amount in each 100 milliliters of water; (2) a step of preparing mother solution, in which the alkali metal and water are reacted according to the raw material mixing ratio in the step (1), and the starch is added after the reaction is completed; (3) a step of performing chelation and copolymerization, in which an organic sodium salt is added into the mixture obtained by the step (2) under a stirring condition, the mixture is heated to 70 to 80 DEG C, and a reaction is performed for 1 hour; (4) a step of adding auxiliary material, in which the reducing initiator is added into the mixture obtained by the step (3), the mixture is heated to 120 DEG C and the reaction is performed at a constant temperature for 4 hours; and (5) a step of drying and crushing, in which the mixture obtained by the step (4) is dried at 100 DEG C and crushed. The high-temperature resistant and salt resistant shear strength-improving agent for drilling fluid, which is prepared by the method of the invention, has high high-temperature and salt resistance.

Description

technical field [0001] The invention relates to a shear raising agent for drilling fluid used in petroleum exploration drilling, in particular to a shear raising agent with high temperature resistance, salt resistance and no pollution. Background technique [0002] With the increase of world energy demand and the development of drilling technology, the number of deep wells and ultra-deep wells in my country is also increasing. During drilling, the deeper the wellbore, the higher the temperature inside the wellbore. Because all additives in drilling fluid will be oxidized and decomposed to lose their original structure under high temperature conditions, the rheology of drilling fluid is difficult to control, and the problem of high temperature resistance of drilling fluid is becoming more and more prominent. The anti-high temperature cutting agent is one of the indispensable drilling fluid treatment agents in the drilling process. It can adjust the suspended cuttings in the ...

AI Technical Summary

Problems solved by technology

There are relatively few studies on cutting agents, especially in recent years, the research work in this area has almost stagnated, and there are even fewer examples of successful field applications, and there is a lack of suitable for special bottom conditions (such as high temperature resistance, salt water resistance, etc.) ) cutting agent

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