Process for preparing drilling fluid based on control of dosage of viscosity reducer

Abstract

The invention discloses a process for preparing a drilling fluid based on controlling dosage of a viscosity reducer. The process comprises the following steps of: (a) preparing sodium bentonite for future use; (b) adding a tackifier PAC-HV and completely dissolving the tackifier PAC-HV; (c) adding a filtrate reducer SMP-2; (d) adding KCl and NaCl; (e) adding a deformation blocking agent FT-1 and a rigidity blocking agent CaCO3; (f) adding 2-4% of viscosity reducer PSC-1; (g) adding TRH-2 so that TRH-2 acts thoroughly; and (h) heating the system and then adding a weighing agent, thereby obtaining the product. The process is capable of successfully preparing the drilling fluid having high temperature resistance and high density by controlling the dosage of the viscosity reducer PSC-1 in the preparation process, and is simple in preparation procedure and easy to operate; the preparation cost of the drilling fluid is reduced, and the prepared drilling fluid system is excellent in performance, thus the requirements for drilling project and reservoir protection are met.

Description

technical field [0001] The invention relates to a preparation process, in particular to a drilling fluid preparation process based on controlling the addition of a viscosity reducer. 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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