卡拉赞巴斯油田浅层调整井防窜固井技术

Anti-channeling cementing technology for shallow adjustment wells in Karazhanbas Oilfield

韦庭丛 郭小阳 程小伟 辜涛 王升正 杨雨佳

WEI Tingcong GUO Xiaoyang CHENG Xiaowei GU Tao WANG Shengzheng YANG Yujia

西南石油大学材料科学与工程学院，四川成都　610500 西南石油大学油气藏地质及开发工程国家重点实验室，四川成都　610500

School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

卡拉赞巴斯油田老区浅层调整井固井后存在声幅测井质量合格率低、环空带压严重的问题，分析其原因是由于前期水泥浆设计指导原则脱离油田实际。针对现场实际要求，通过去掉降滤失剂、减少分散剂使用、选择合理实验温度、优化外掺料配比等措施调整水泥浆配方，调整后的低温早强水泥浆体系稠化时间、终凝时间可分别控制在2 h、4 h 以内，8 h 强度可达3 MPa 以上。对调整后的水泥浆体系进行了8 井次的现场应用，固井合格率由前期的69% 提高到90% 以上，基本上解决了该油田薄油层、薄隔层、活跃水层调整井固井难题，为油田的高效开发创造了良好条件。

After cementing job in the shallow adjustment wells in matured blocks of Karazhanbas Oilfield, there existed some problems like low acoustic amplitude logging pass rate, severe annulus pressure. Analysis shows that the reason for this is that the guidelines for design of previous cement slurry gradually deviated from the actual conditions of the oilfield. In view of the actual field requirements, the cement slurry formulation was adjusted by removing the fluid loss agent, reducing the use of dispersants, choosing reasonable experimental temperature and optimizing the admixture ratio. The thickening time and initial setting time of the adjusted low temperature early strength cement slurry system were controlled within 2 h and 4 h respectively. If controlled within 8 h, its strength may be over 3 MPa. This adjusted cement slurry system was applied for the eight well times, and the cementing qualification rate was up from 69% to over 90%, which has basically solved the difficulty in cementing of adjustment wells with thin oil layers, thin isolating layers, active aquifer, and has created a favorable condition for efficient development of the Oilfield.

10.13639/j.odpt.2015.05.013