一袋化多功能钻井液的研究与应用

Study and Application of“All-in-One Bag”Multi-Function Drilling Fluids

采用分散聚合工艺合成了一种新型环保多功能添加剂PF-MFA,其同时兼具增黏提切、包被抑制、滤失控制等多种功能;以其作为唯一核心添加剂,搭配海水基液和加重剂,研发了一套新型一袋化钻井液体系。该钻井液组成简单、性能高效,当PF-MFA加量为1%时,80℃热滚后体系仍具有较高的黏度、切力和较强的抑制性,API滤失量控制在6.5 mL以下,而且抗盐抗钙抗污染能力突出,可抗20%NaCl或15%的污染土,抗钙可达2%CaCl2,另外,体系具有环保可降解的特点。该一袋化钻井液体系在渤海蓬莱PL19-3油田V40井进行了应用并取得了成功,现场应用表明,新型一袋化钻井液体系材料用量少,性能稳定,配制维护简单,能够满足地层相对简单的生产井和调整井钻井作业。

A new environmentally friendly multi-function drilling fluid additive PF-MFA was synthesized through dispersion polymerization.PF-MFA can be used as viscosifier,gelling agent,shale encapsulator,shale inhibitor and filter loss reducer.A new“all-in-one bag”drilling fluid was formulated with PF-MFA as the unique core additive,seawater and weighting agent as the auxiliary additives.This new drilling fluid has simple composition and high performance.A drilling fluid treated with 1%PF-MFA,after hot rolling at 80℃,still had high viscosity,gel strengths and strong inhibitive capacity,the API filter loss was controlled at less than 6.5 mL.The salt,clay and calcium(CaCl2)resistance of this drilling fluid were 20%,15%and 2%,respectively.This drilling fluid is also biodegradable and is thus environmentally friendly.This“all-in-one bag”drilling fluid has been successfully used in the well V40 in the Block PL19-3 in Penglai,Bohai.Field operation showed that less amount of drilling fluid additives was required for the“all-in-one bag”drilling fluid to achieve the same goal.Stable and easy to maintain properties as well as simple composition of the“all-in-one bag”drilling fluid can satisfy the needs of drilling production wells and adjustment wells penetrating relatively easy-going formations.