地质钻探用白色型环保防塌剂GHF制备及性能评价

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

摘要:

随着环保法规要求日益严格，黑色外观、环保性能不足等缺点，是限制冲洗液防塌材料应用的关键问题。为此，通过合成小分子聚丙烯酸钠，再与黏性树脂等材料捏合反应，制备出一种冲洗液用白色型环保防塌剂GHF。研究发现，0.5% GHF加入LBM、环保双聚、环保成膜等常用冲洗液体系中，不会影响冲洗液流变性能，且还有一定降滤失效果。1% GHF具备良好的封堵降滤失作用，其30 min内渗透滤失量仅7 mL，侵入砂床深度为1.5 cm，结果表明其对于低渗透地层具有良好的封堵作用。与清水相比，1%GHF水溶液页岩膨胀降低率为55.6%，表明GHF能够防止孔壁坍塌等复杂事故。

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.