巴麦地区固井技术难点与针对性措施　　

Technical difficulties and specific measures of cementing in the Bachu-Maigaiti Area

常连玉 高元 许建华 杨广国

CHANG Lianyu GAO Yuan XU Jianhua YANG Guangguo

西南石油大学石油工程学院，四川成都　610500 中国石化石油工程技术研究院，北京　100101

College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China

巴麦地区地质条件复杂，普遍存在低压易漏、异常高压、大段盐膏层和高压盐水层等地层。针对该地区固井技术难点，研制了性能优良的堵漏隔离液体系、密度1.20~1.45 g/cm3的低密度水泥浆体系、密度2.60~3.00 g/cm3的高密度抗盐水泥浆体系，并对该地区低压易漏层固井防漏技术、异常高压层高密度固井技术、盐膏层和高压盐水层固井专封技术等进行了完善与优化，形成了一系列效果良好的技术措施。玛北1、PSB1等井的现场应用结果表明，该技术有效地解决了该区块的固井难题，提高了巴麦地区探井的固井质量。

Since the complicated geological conditions in Bachu-Maigaiti Block, where low-pressure thief layers, abnormal high-pressure formation, long section salt beds and high-pressure brine formations were wildly distributed, and easily led to poor cementing quality. In view of technical difficulties of cementing in this area, excellent performance plugging isolation fluid system, ultra-low density slurry system with density of 1.20~1.45 g/cm3, and 2.60~3.00 g/cm3 ultra-high density salt tolerant slurry system were researched. leak protection technology of low-pressure thief layer cementing, ultra-high density cementing technology of ultra-high pressure zone, and special cementing technology of salt beds and high-pressure brine formations were improved and optimized, which formed series of technical measures and achieved good effects. The field application results in Well Mabei1 and Well PSB1 show that difficult cementing problems of low-pressure thief layers, abnormal high pressure layers and ultra-high pressure salt-water formation were solved effectively, and exploration well cementing quality were improved in Bachu-Maigaiti area.