摘要
井漏是影响顺北油田安全、快速、高效钻井的重大技术难题之一。通过对现场漏失资料的统计分析,明确了顺北油田二叠系地层具有非均质性强、多尺度裂缝发育和裂缝易扩展的特点,且整体上北部漏失程度较轻,南部漏失程度较严重;二叠系漏失机理为压差性漏失和裂缝扩展性漏失,并以压差性漏失为主。优选了高效随钻封堵剂SMGF-1,钻井液中加入3%的SMGF-1,可使得0.45~0.90 mm砂床承压达8.5 MPa,具备良好的防漏效果;研发了高效承压堵漏剂SMKZD-1,1~3 mm裂缝承压均大于5.0 MPa,具有良好的广谱封堵效果。现场应用表明,该防漏堵漏技术可以提高二叠系火成岩地层的防漏与堵漏效果。
Lost circulation is one of the main technical roadblocks to safe, fast and effcient drilling in Shunbei oilfeld. Analysis of the feld operation data concerning lost circulation showed that the Permian system in Shunbei oilfeld is highly heterogeneous and full of fractures of different sizes and that are easy to propagate. Generally speaking, lost circulation in the north of the feld is not as serious as that in the south of the oilfeld. The mechanisms of the lost circulation are mainly caused by pressure differential in the Permian system. Fracture propagation, on the other hand, is a minor cause of lost circulation. A highly effcient plugging agent, SMGF-1, an LCM used while drilling is going on, was selected and added into the drilling fuid by 3%. Laboratory test with this LCM drilling fuid sample showed that the pressure bearing capacity of a sand-bed with 0.45-0.90 mm artifcial fractures was 8.5 MPa, indicating that SMGF-1 is effective in controlling mud losses. Another high effciency lost circulation material, SMKZD-1, an LCM used for controlling mud losses under pressure, was tested on a sand-bed with fractures of 1-3 mm, and the pressure bearing capacity was greater than 5 MPa, indicating that SMKZD-1 is a broad-spectrum high performance LCM. Field operations showed that the use of the two lost circulation materials improves the job quality of preventing and controlling mud losses into the Permian igneous rocks.
作者
潘军
李大奇
PAN Jun;LI Daqi(Sinopec Oilfeld Business Division,Beijing 100728;Sinopec Research Institute of Petroleum Engineering,Beijing 100101)
出处
《钻井液与完井液》
CAS
北大核心
2018年第3期42-47,共6页
Drilling Fluid & Completion Fluid
基金
国家科技重大专项(2017ZX05005-005)
国家自然科学基金重大项目资助(51490650)
关键词
火成岩
漏失机理
裂缝扩展
承压堵漏
顺北油田
Igneous rock
Mechanism of lost circulation
Fracture propagation
Mud loss control under pressure
Shunbei oilfeld
