High-temperature hot dry rock flushing fluid and preparation method

Abstract

The invention discloses a high-temperature hot dry rock flushing fluid and a preparation method. The flushing fluid comprises a normal-temperature well section flushing fluid and a high-temperature well section flushing liquid, wherein the normal-temperature well section flushing fluid is prepared from components as follows: bentonite, sodium carbonate (Na2CO3), hydrolyzed polyacrylamide and dry hydrolyzed polyacrylonitrile powder; the high-temperature well section flushing liquid is prepared from the components as follows: bentonite slurry, potassium polyacrylate, a liquid lubricant, sulfonated lignite, sulfonated phenolic resin, a high-temperature anti-salt filtrate reducer, an anti-sloughing lubricant and a viscosity-reducing filtrate reducer. A polymer drilling fluid is added on the basis of the sulfonated drilling fluid, the drilling fluid reserves advantages of the polymer drilling fluid, improves the filter cake quality and rheological property of polymers at the high temperature and under the high pressure and has the temperature resistance up to 200-250 DEG C, the drilling efficiency is improved, and drilling accidents are reduced.

Description

technical field [0001] The invention relates to a flushing fluid and a preparation method, in particular to a high-temperature hot dry rock flushing fluid and a preparation method, and belongs to the technical field of drilling fluid preparation. Background technique [0002] With the development of human society, the demand for energy is increasing. As a clean, environmentally friendly, efficient, cheap and stable new energy - geothermal energy has become the focus of research and development of future available energy in developed countries around the world. With the sustainable growth of my country's economy, geothermal energy is a new energy system, and its research and development has become an important part of my country's new energy system. Hot dry rock refers to geothermal resources stored in hot dry rock mass, and there is no hot water and steam in the heat storage rock mass. Its temperature can reach hundreds of degrees Celsius. According to the geothermal gradie...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a high-temperature hot dry rock flushing fluid and a preparation method, which can effectively solve the problem that due to the characteristics of hot dry rock mass, blowouts are prone to occur after water and heat exchange, and there are a large number of medium and small cracks in the hot dry rock mass and its overlying strata. , prone to leakage defects