一袋化多功能钻井液的研究与应用

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6.5mL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。 

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

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.