Site construction preparation method for coal bed methane fuzzy-ball drilling fluid

Abstract

The invention relates to a site construction preparation method for a coal bed methane fuzzy-ball drilling fluid. The site construction preparation method comprises the following steps: sequentially adding 5-8 parts by weight of a ball-fuzzy agent, 2-5 parts by weight of a ball mass agent and 1-2 parts of a ball containing agent into 400 parts by weight of clear water, and continually performing stirring for at least 30 min to obtain a fuzzy-ball drilling fluid; utilizing a liquid densimeter to measure the density value of the fuzzy-ball drilling fluid, and utilizing a six-speed rotary viscometer to measure the fuzzy-ball drilling fluid so as to obtain the apparent viscosity, the plastic viscosity, the yield value and the dynamic shear force ratio and to obtain the coal bed methane fuzzy-ball drilling fluid. The invention aims to provide the site construction preparation method for the coal bed methane fuzzy-ball drilling fluid, which is simple in site construction, low in formation damage, good in coal bed well wall stabilizing effect and strong in leakage prevention and control capability and can effectively solve the problems of severe coal bed collapse, much loss of the drilling fluid and the like in the coal bed gas drilling operation process.

Description

technical field [0001] The invention relates to the field of coalbed methane drilling, in particular to a preparation method for on-site construction of coalbed methane velvet drilling fluid. Background technique [0002] Coalbed methane velvet drilling fluid is a kind of anti-slump and control drilling fluid system developed for the serious leakage and collapse of coal seam, sandstone layer and mudstone layer during the drilling and completion of coalbed methane wells. It can solve the problems of vertical wells, directional wells, water Difficulties in controlling formation collapse and leakage in different types of wells such as flat wells, U-shaped wells, and multi-branch wells. [0003] Coalbed methane velvet drilling fluid is a gas-liquid two-phase fluid without solid phase. Through the distribution of velvet structures with different diameters in the fluid, conventional drilling fluid can lubricate the well wall and carry cuttings, and at the same time ensure good ant...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method with simple on-site construction, low reservoir damage, good coal seam well wall stabilization effect, strong leakage prevention and control ability, which can effectively solve the problem of serious coal seam collapse and large drilling fluid loss during coalbed methane drilling operations. On-site construction preparation method of coalbed methane velvet drilling fluid