A kind of upper formation anti-slump drilling fluid and preparation method thereof

Abstract

The invention provides an upper stratum anti-slump drilling fluid, which comprises a plugging and anti-slumping inhibitor, a stabilizer, a viscosifier and water; The granular lost circulation plugging material modified by ammonium chloride and the fibrous lost circulation material are obtained; the granular lost circulation plugging material includes fruit shell. Compared with the prior art, the plugging and anti-slump inhibitor used in the present invention utilizes the unique "cloud point" effect of polyalcohol to form an effective isolation film on the surface of the borehole wall to block the channel for drilling fluid to penetrate into the formation. The shell and fibers form a complex network structure, which reduces the depth of drilling fluid invasion into the formation; at the same time, the reaction between dimethyl dienyl ammonium chloride and polyalcohol produces a synergistic effect to enhance the inhibition and dispersion of the system to achieve effective stability The effect of the borehole wall; combined with stabilizers and viscosifiers, the drilling fluid system has low fluid loss and strong inhibition, which can effectively prevent formation instability. Moreover, the system has a simple formula and is convenient for preparation and maintenance.

Description

A kind of upper formation anti-slump drilling fluid and preparation method thereof technical field The invention belongs to the technical field of coalbed methane exploitation, in particular to a kind of upper formation anti-slump drilling fluid and preparation thereof method. Background technique [0002] Coalbed methane is natural gas stored in the pores of coalbeds in an adsorbed and free state. my country is rich in coal Therefore, the country is currently vigorously carrying out exploration and development of coalbed methane. In the process of mining coalbed methane, drillers Process is the most critical technology. [0003] There are certain differences in the process of coal seam drilling compared with conventional formation drilling. A cap covering the upper part of the coal seam with coal rock The main component is mud shale. After the drilling fluid filtrate invades, the mud shale will produce local hydration, which will lead to The rock at the borehole ...

AI Technical Summary

Problems solved by technology

This system is mostly used in sand-shale interbedded well sections of East China Sea oil and gas fields to deal with the plugging and anti-collapsing of brittle high water-sensitive shale well sections, but the effect is poor in the actual application process, and tripping still occurs in the actual application process on site Occurrence of resistance and holding torque, etc., proves that low free water drilling fluid has poor plugging and inhibition ability.

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