准噶尔盆地车排子火山岩地层防漏堵漏技术

Leakage Prevention and Plugging Technology of Chepaizi Volcanic Rock Formation in Junggar Basin

徐生江 鲁铁梅 戎克生 姚旭洋 叶成

XU Shengjiang，LU Tiemei，RONG Kesheng，YAO Xuyang，YE Cheng

准噶尔盆地车排子区块的裂缝形态复杂，石炭系地层较为发育的裂缝造成地层易塌易漏，一次性堵漏成功率较低。在充分考虑车排子火山岩地层工程地质特征的基础上，开展防漏堵漏体系的研究。室内将广覆盖高效防漏堵漏剂（Heseal）、粒状纤维（FiBall）和复合纳米材料（Namaterial）加入现场钻井液中制得堵漏浆，研究了堵漏浆对砂床和裂缝的封堵效果，采用模拟转向和返吐的方式评价堵漏浆在不规则地层裂缝中的转向封堵能力和返吐趋势。结果表明，Heseal、FiBall 和Namaterial 的最佳复配比为6∶3∶1。3 种堵漏材料对现场钻井液流变性和滤失性的影响较小。堵漏浆对砂床与裂缝的封堵效果及转向性能较好，防漏堵漏效果良好，满足车排子地区复杂裂缝形态下的防漏堵漏要求。

Fractures in the Chepaizi block of Junggar Basin are complex. The relatively developed fractures in Carboniferous strata cause the formation to collapse and leak easily，and the success rate of one-time plugging is low. On the basis of full consideration of the engineering geological characteristics of Chepaizi volcanic rock formation，the study of leakage prevention and plugging system was carried out. A wide-coverage high-efficiency leak-proof plugging agent （Heseal），granular fiber （FiBall） and composite nano-material（Namaterial）were added to the on-site drilling fluid and a plugging slurry was prepared. The plugging effect of plugging slurry on sand bed and fractures was studied. The turning plugging ability and vomiting trend of plugging slurry in irregular formation fracture were evaluated by the method of simulating turning and vomiting. The results showed that the best combination ratio of Heseal，FiBall and Namaterial was 6∶3∶1. The three plugging materials had little effect on the rheology and fluid loss of drilling fluid. The plugging slurry had good steering performance，sealing effect on sand bed and fracture，and leak protection effects，which could meet the requirements of leakage prevention and plugging under complex fracture patterns in Chepaizi block.

10.19346/j.cnki.1000-4092.2022.02.005