Practice of drilling and completion technology of heat exchange well in western slope area of Songliao Basin
The rational development and utilization of geothermal resources is of great significance in promoting the transfor-mation of energy structure,advancing the development of green and clean energy and realizing the goal of"double carbon"in the new era.The Da'an region in the western slope area of Songliao Basin is rich in medium-deep geothermal resources,but the medium-deep heat exchange wells have not been constructed in the region,and there is a lack of mature drilling and completion technology experience.Based on the geological data obtained from exploration-and production-combined wells,we summarize the formation lithology characteristics and drilling difficulties in this area,analyze the depth,aperture,structure of heat exchange wells and the geometric distribution of well groups,and determine the heat exchange well scheme suitable for vertical and directional wells in this region.According to the difference of formation lithology characteristics,the drilling technology of soft mudstone formation in the second section and granite formation in the third section is summarized,which can greatly shorten the completion period.In light of the drilling structure,the specification of the center pipe is designed and the flow stabilizer is set at the bottom to ensure the full heat exchange at the bottom of the well and the steady water flow in the well.The study can provide a reference for the development and utilization of dry heat medium and deep geothermal energy in the region.
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