石油钻采工艺2026，Vol.48Issue(2)：157-166,10.DOI:10.13639/j.odpt.202507018
鄂尔多斯盆地东部刘家沟组反复井漏机理及治理措施
Study on mechanism and control strategy of repeated lost circulation in Liujiagou formation,Eastern Ordos Basin
摘要
Abstract
In order to address the challenges of repeated lost circulation in network fracture developed-stratum at the bottom of Liujiagou formation in eastern Ordos Basin,the mineralogical natures of rocks were analyzed by using X-ray diffraction and scanning electronic microscope,and flow tests on water sensitivity and velocity sensitivity of rocks were conducted,which revealed that the clay minerals in target stratum reaches as high as 22%to 67%,exhibiting stronger water sensitivity and velocity sensitivity,leading to weakness of the fracture wall strength and increase of the fracture width.The conventional lost circulation materials are prone to corrosion and fail to prop up the fractures,resulting in diminished plugging effect and ultimately repeated lost circulation.Thus,a weak gel-bridge plug composite lost circulation material with high suspension capacity and alkali corrosion resistance was introduced.This kind of material enables to largely invade the lost circulation channels to block the contact between drilling fluid and fracture walls,thereby inhibiting water sensitivity and velocity sensitivity.Laboratory slot tests show that the fluid loss gradually stabilizes with further pressure increases after the pressure climbs to 6 MPa,and the pressure essentially remains unchanged after 50 minutes of shut-in.Field trials in 40 wells reached a primary success ratio of 97.5%without recurrence of lost circulation.This research offers an effective solution for repeated lost circulation in fractured strata with strong water sensitivity and velocity sensitivity,and also points to a direction for the development of novel plugging materials.关键词
鄂尔多斯盆地东部/刘家沟组/网状缝/反复井漏/水敏性/速敏性/弱凝胶-桥塞型复合堵漏材料Key words
Eastern Ordos Basin/Liujiagou Formation/network fracture/repeated lost circulation/water sensitivity/velocity sensitivity/weak gel-bridge plug composite plugging material分类
能源科技引用本文复制引用
赵宏波,李兴宝,费世祥,季伟,韩富波,刘杰,柳小宝,石明亮..鄂尔多斯盆地东部刘家沟组反复井漏机理及治理措施[J].石油钻采工艺,2026,48(2):157-166,10.基金项目
中国石油天然气股份有限公司科技专项"深地煤岩气成藏理论与效益开发技术研究"(编号:2024DKT09) （编号:2024DKT09）
中国石油天然气股份有限公司油气和新能源分公司科研项目"致密砂岩气藏提高采收率关键技术研究"(编号:2023ZZ25) （编号:2023ZZ25）
中国石油勘探与生产分公司攻关项目"致密油气藏提速提效钻完井技术研究"(编号:1902-3-2). （编号:1902-3-2）
