Preparation method of shale inhibitor with filtrate reduction property

Abstract

The invention discloses a preparation method of a shale inhibitor with a filtrate reduction property. The method comprises the following steps: (1) adding an inorganic base to an n-amine solution, and uniformly mixing and stirring the inorganic base and the n-amine solution, wherein n is an integer larger than 1, the dosage of the inorganic base is 0.05-3% of the mass of the n-amine, preferably 0.5-1%; (2) adding an etherifying agent to the mixed fluid of the step (1), carrying out a reaction under 60-100 DEG C for 6-10 hours, preferably under 80-100 DEG C for 8-10 hours, the molar ratio of the etherifying agent to the n-amine is larger than 1.0, preferably 2.0-4.0; (3) reducing the temperature to indoor temperature after the reaction in the step (2) is over, and regulating the pH value of the solution to the neutral value so as to obtain the shale inhibitor with the filtrate reduction property. The preparation method is simple in preparation process and low in cost, the prepared shale inhibitor has good performance of shale inhibition and good filtrate reduction property at the same time, requirements for the performances of the shale inhibitor and a filtrate reducer which are used for a drilling fluid can be satisfied at the same time, one agent integrates multiple functions, and therefore, the actual problems of hydration, dispersion and swelling of clay shales, the collapse of a borehole wall, and the like can be solved.

Description

technical field [0001] The invention relates to a preparation method of a shale inhibitor with fluid loss control performance, in particular to a preparation method of an amine-based shale inhibitor with fluid loss control performance. Background technique [0002] In drilling engineering, 75% of the formations encountered are mud shale formations, and about 90% of wellbore instability problems occur in mud shale well sections. It can be seen from this that shale suppression is important for drilling engineering. The currently used shale inhibitors are mainly low-molecular polyetheramines, polyetheramine derivatives or their mixtures, among which amine-terminated polyethers, such as D230 and D400, have been successfully used in drilling fluid systems. The experimental results show that the drilling fluid system prepared by amino-terminated polyether can effectively inhibit the hydration, dispersion and expansion of active shale, provide good wellbore stability; coat cuttings...

AI Technical Summary

Problems solved by technology

The method not only has a simple preparation process and low cost, but also the prepared shale inhibitor has good shale inhibition performance and fluid loss control performance, and can meet the performance requirements of shale inhibitor and fluid loss control agent for drilling fluid at the same time. One agent with multiple functions can solve practical problems such as mud shale hydration, dispersion, expansion, and well wall collapse