Preparation and performance evaluation of an environmentally friendly white anti-collapse agent GHF for geological drilling

Abstract:

As the environmental regulations become increasingly stringent， drawbacks such as the dark appearance and inadequate environmental performance of conventional materials have emerged as the key issues restricting the application of anti-collapse agents in drilling fluids. To address this challenge， as an environmentally friendly white anti-collapse agent， GHF was developed by synthesizing low-molecular-weight sodium polyacrylate and subsequently subjecting it to a kneading reaction with materials such as viscous resin. Research indicates that the addition of 0.5% GHF to commonly used drilling fluids， including LBM， environmentally friendly dual-polymer， and environmentally friendly film-forming， exerts no adverse effect on the rheological properties of the drilling fluids， while also providing a certain degree of filtration loss reduction. At a concentration of 1%， GHF exhibits favorable plugging and filtration-control performance， with a filtration loss of only 7 mL within 30 min and a penetration depth of 1.5 cm into the formation， demonstrating its excellent plugging capability for low-permeability formations. Furthermore， compared with clean water， the aqueous solution containing 1% GHF achieves a shale swelling reduction rate of 55.6%， indicating that this environmentally friendly anti-collapse agent can effectively prevent complex downhole incidents such as borehole wall collapse.