Process for preparing drilling fluid based on weighting material

Abstract

The invention discloses a process for preparing a drilling fluid based on a weighting material. 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 a viscosity reducer PSC-1; (g) adding TRH-2 so that TRH-2 thoroughly acts; and (h) heating the system and then adding the weighing material barite, thereby obtaining the product. The process is characterized in that the weighing material in the preparation process is rationally selected so that the total solid phase content of the drilling fluid is reduced and the rheological property of the drilling fluid is guaranteed to be well controlled.

Description

technical field [0001] The invention relates to a preparation process, in particular to a drilling fluid preparation process based on weighted materials. Background technique [0002] With the continuous development of the world's petroleum industry, the oil and gas drilling and development area is constantly expanding, and the drilling and development are gradually developing from shallow to deep. Requirements 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 lithology. The specific manifestations are: deep wells have high downhole temperature and pressure, complex formations, and sometimes ultra-high pressure brine ...

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.