抗返吐堵漏剂的研制及现场应用

Development and Field Application of Anti-returning and Plugging Agent

曾光 高德伟 曾家新 万秀梅 严俊涛

ZENG Guan GAO Dewei ZENG Jiaxin WAN Xiumei YAN Juntao

针对川渝区块页岩气堵漏高承压、易返吐的特点，以高软化点树脂为主体，研制了抗返吐堵漏剂（ARP）。 室内评价了ARP堵剂在现场油基钻井液中的分散性、与现场堵漏剂的胶结强度，并测试了其胶结固化后的承压 能力和抗返吐能力。结果表明，ARP 堵剂的最优配方为环氧树脂（软化点90 ℃）、铁矿粉、20%二乙基甲苯二 胺。当堵剂密度为1.8 g/cm3、粒径为0.5～2.0 mm时，其在现场油基钻井液中的分散性较好。ARP堵剂具有变形 和胶结固化能力，与桥堵颗粒复配使用时，可在地层裂缝中与其他普通堵漏颗粒胶结固化，从而提高整体封堵段 塞的承压能力和抗返吐能力。将ARP堵剂与现场堵漏剂复配使用时，ARP适宜的占比为15%～25%，复合堵剂 的胶结强度可达2.7～7.8 MPa。将ARP配制的堵漏浆用于封堵2～3 mm裂缝，正向承压可达8 MPa，抗返吐承 压能力可达3.3 MPa。根据材料特点，在四川长宁某井设计现场施工该工艺并应用，取得了较好的堵漏效果。

In view of the characteristics of shale gas plugging in Sichuan and Chongqing block，such as high pressure and easy backflow，the anti-backflow plugging agent（ARP）was developed with high softening point resin as the main body. The dispersion of ARP plugging agent in the field oil-based drilling fluid and the bonding strength with the field plugging agent were evaluated in the laboratory. Its pressure-bearing capacity and anti-backflow capacity after cementing and solidification were tested. The results showed that the best formula of ARP plugging agent was obtained as follows：epoxy resin（softening point 90 ℃），iron ore powder，20% diethyl toluene diamine. When the density of the plugging agent was 1.8 g/cm3 and the particle size was 0.5—2.0mm，it had good dispersion in the field oil-based drilling fluid. ARP plugging agent had the ability of deformation，cementation and solidification. When ARP plugging agent was used in combination with bridge plugging particle，it could cement and solidify with other ordinary plugging particles in formation fractures，thus improving the pressure bearing capacity and anti-backflow ability of the overall plugging slug. When ARP plugging agent was combined with field plugging agent，the appropriate proportion of ARP was 15%—25%. Meanwhile，the cementing strength of the composite plugging agent could reach 2.7—7.8 MPa. When the lost circulation slurry prepared by ARP was used to seal fractures with 2—3 mm width，the positive pressure bearing capacity could reach 8 MPa，while the anti-backflow pressure bearing capacity could reach 3.3 MPa. According to the characteristics of materials， the site construction technology was designed and applied in a well in Changning，Sichuan. A good plugging effect was achieved.

10.19346/j.cnki.1000-4092.2023.01.005