Thermosensitive resin inhibition plugging agent for drilling fluid and preparation method thereof

Abstract

The invention discloses a thermosensitive resin inhibition plugging agent for drilling fluid and a preparation method thereof. The method comprises the steps of: performing modification treatment fororganic siloxane, and mixing treated bentonite to obtain an inhibition plugging agent for drilling fluid. The obtained inhibition plugging agent is high in sensitivity, good in temperature resistanceand high in strength, the affinity of the resin system is changed under the action of heat, the distance between fine liquid drops in the drilling fluid system and other oil-soluble dispersant particles is increased, the plastic viscosity of the drilling fluid is reduced, hydration expansion of clay is inhibited, the low-temperature low-pressure closed filtration loss and the high-temperature high-pressure permeation filtration loss are low, and the inhibition and plugging performance of the drilling fluid is improved.

Description

technical field

[0001] The invention belongs to the technical field of drilling fluid plugging agents, and in particular relates to a heat-sensitive resin inhibiting plugging agent for drilling fluids and a preparation method thereof. Background technique

[0002] The increasingly complex geological conditions in the process of oil and gas exploration and development put forward higher requirements for the stability of the well wall. During the drilling process, the drilling fluid filtrate easily enters the formation through tiny pores under the action of the pressure difference. The transfer effect in the micro-fractures causes the development of fractures, which makes the stability of the wellbore wall worse, and in severe cases, it leads to drilling accidents such as wellbore collapse.

[0003] Borehole wall instability is a major engineering problem that has plagued the drilling industry for many years and has yet to be solved. Well wall instability will lead to a serie...