钻井液与完井液2025，Vol.42Issue(5)：631-639,9.DOI:10.12358/j.issn.1001-5620.2025.05.009
强封堵油基钻井液在歧北页岩油先导试验井的应用
The Application of an Oil-Based Drilling Fluid with Strong Plugging Capacity in Pilot Test Shale Oil Wells in Qibei Area
摘要
Abstract
The proved undeveloped shale oil reserves in block Qibei of Dagang oilfield are still very high and their burial depths can be 4,500 m or deeper.This oil and gas enrichment area is located in the Shahejie reservoir which has high content of clays as well as developed interlayer pores and microfractures.Past experiences show that borehole wall instability and difficulties in tripping of drill strings have been encountered.To deal with these problems,three pilot test wells were drilled first in this area with oil-based drilling fluids.In laboratory studies an oil-based drilling fluid was formulated with 2%nanolatex,2%sized calcium carbonate and 2%oxidized asphalt.Sizing of the particles rendered the drilling fluid high plugging capacity.In field application,the filtration rate of this drilling fluid through 750 mD sand-disks was reduced to 0.8 mL because the particles in the drilling fluid plugged the formation,minimizing the volume of the filtrates into the formations.In this way the wellbore stability was improved.The well QY6-31-2 was drilled in 40.98 d,refreshing PetroChina's shortest drilling time record of wells with depths raging in 6501-7000 m,and setting 5 records in Dagang oilfield,such as the deepest completed well(6558 m)of horizontal shale oil wells.The use of oil-based drilling fluid has ensured the smooth construction of the pilot test wells.关键词
强封堵/颗粒级配/油基钻井液/深层页岩油Key words
Strongly plug/Particle sizing/Oil-based drilling fluid/Deep shale oil分类
能源科技引用本文复制引用
马红,庄涛,文飞,王磊磊,李晓晨,陈安亮,王禹..强封堵油基钻井液在歧北页岩油先导试验井的应用[J].钻井液与完井液,2025,42(5):631-639,9.基金项目
天津市科技计划项目"非常规和深层油气资源开发钻井液关键技术研究"(19PTSYJC00120). （19PTSYJC00120）
