Preparation process of drilling fluid based on control of addition of rigid blocking agent

Abstract

The invention discloses a preparation process of a drilling fluid based on control of addition of a rigid blocking agent. The preparation process comprises the following steps: (a) preparing sodium bentonite for later use; (b) adding a tackifier PAC-HV and completely dissolving the tackifier; (c) adding a filtrate reducer SMP-2; (d) adding KCl and NaCl; (e) adding a deformation blocking agent FT-1 and 1.8-2.0% of rigid blocking agent CaCO3; (f) adding SPNH and PSC-1; (g) adding TRH-2 and acting the TRH-2 adequately; and (h) heating the system to obtain the product. According to the preparation process provided by the invention, not only can high temperature resistant high-density drilling fluid be prepared successfully, but also the preparation process is simple and easy to operate by controlling the addition of the rigid blocking agent in the preparation process. The preparation cost of the drilling fluid is lowered, and the drilling fluid system prepared is high in plastic viscosity and stability, so that the demands for drilling engineering and reservoir protection are satisfied.

Description

technical field [0001] The invention relates to a preparation process, in particular to a drilling fluid preparation process based on controlling the dosage of rigid plugging agent. Background technique [0002] With the continuous development of the world's petroleum industry, oil and gas drilling and development areas continue to expand, drilling and development is gradually developing from shallow to deep, geological structures are becoming more and more complex, and drilling depth is increasing, which puts forward higher requirements for the required drilling fluid To meet the increasing development of the petroleum industry. [0003] At present, in China's oil and gas exploration and development, deep wells will be the focus of future exploration and development. Drilling operations in the Bashituo area of ​​Xinjiang are difficult, time-efficient and costly due to the relatively deep burial of reservoirs, large changes in formation pressure, and complex and changeable ...

AI Technical Summary

Problems solved by technology

All of these conditions will impair the rheology of high-density water-based drilling fluid systems

[0013] In addition, if the solid phase content in the drilling fluid system is high, the treatment agent itself has poor resistance to temperature, salt, and calcium, and the treatment agent will lose its effectiveness. As a result, the rheology of high-density water-based drilling fluid cannot be controlled.

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