**1-H*复杂井“正注、反挤、中间分流”固井技术

**1-H*井二开穿越新近系库车组N2k、康村组N1-2k及吉迪克组N1j上段泥岩、砂泥岩和砂砾岩互层及吉迪克组N 1j层下段泥岩、砂岩、膏泥岩互层，于古近系E2-3s泥岩顶完钻固井，为三开低压层钻进创造条件。该开次5065～5360.53 m井段有多套高压盐水层，钻井液密度为1.51 g/cm3，静止状态出现水侵溢流，5318～5324.51 m井段为漏失层，开泵出现失返性漏失，井底仅有2.47 m泥岩隔板层，溢流层与漏层共存，形成又漏又溢的井下复杂状况，在不断压井、堵漏中完成钻进和电测作业，中途完钻井深为5363 m，下入φ244.5 mm套管。采用抗侵防窜、防漏、高韧性、三凝双密度抗盐水泥浆体系和“正注、反挤、中间分流”的注水泥技术完成固井作业，封固质量合格。

Normal Injection,Reverse Squeeze and Intermediate Diversion: A Technology for Cementing the Complex Well **1-H*

The second interval of the well **1-H* penetrated the Neogene N2k, N1-2k, the upper N1j (claystone, interbeds of sand shale and sandy conglomerate) and the lower N1j (claystone, sandstone and interbeds of gypsum and claystone), and was drilled to the top of the Paleogene E2-3s formation (claystone), providing conditions for drilling the third interval. Several high pressure water zones are found between 5065 m and 5360.53 m of the second interval, with overflow of well at static condition when mud weight was 1.51 g/cm3. Mud loss was encountered at pumping between 5318 m and 532,51 m, and there was only 2.47 m of claystone worked as a baffle layer. The drilling process of this interval and wireline logging were accompanied by the continual well killing and mud loss control because of the coexistence of mud loss and overflow in the same interval. This interval was drilled to 5363 m and was cased with φ244.5 mm casing string. A cement slurry with anti-channeling agents for invasion resistance, LCM, enhanced toughness, three setting points, double densities and salt resistance was used in the well cementing job. Normal injection, reverse squeeze and intermediate diversion were taken to ensure the success of the well cementing job. The quality of the well cementing job met the designed requirements.