摘要
前置液是固井浆柱结构必不可少的组成部分,主要用于稀释和隔离钻井液,以改善顶替效率和保证固井质量。提高固井质量的关键是有效清除井壁与套管壁上的虚泥饼,替净环空各间隙(尤其是窄间隙处)的钻井液。根据测试分析和数值模拟,建立了前置液合理用量的计算方法:借助六速旋转黏度计法,定量评价前置液对井壁泥饼的冲蚀能力;以流体力学软件数值模拟的方法,研究前置液对水平井段偏心环空内各间隙处钻井液的驱替能力。现场应用和结果对比表明,该方法有效提高了鄂尔多斯盆地定北地区的固井质量。该方法可适用于其他地区、不同井眼状况、不同前置液与钻井液性能下的前置液设计,为保证固井质量提供了一定的参考。
Pad fluid is a necessary part of the cementing slurry column for improving displacement efficiency and guaranteeing cementing quality, mainly by diluting and isolating drilling mud. Removing the mud cake on wellbore or casing wall and displacing drilling mud in different annular gap, especially the narrowest gap, are key requirements. Rational dosage calculation method of pad fluid is proposed based on test analysis and numerical simulation. The erosion capacity of pad fluid can be evaluated by 6-Speed Viscosimeter method. The displacement capacity of pad fluid aiming at drilling mud can be analyzed through numerical simulation by use of CFD software. Field application and result comparison show that this method improves well cementing quality in Dingbei Zone of Ordos Basin.
出处
《断块油气田》
CAS
北大核心
2018年第1期130-132,136,共4页
Fault-Block Oil & Gas Field
基金
中国石化石油工程公司项目"鄂尔多斯工区东胜气田一体化钻完井成套技术"(SG16-24K)
关键词
前置液
冲洗效率
顶替效率
六速旋转黏度计法
数值模拟
pad fluid
flushing efficiency
displacement efficiency
6-Speed Viscosimeter method
numerical simulation
