基于同井双目的层地热勘探井井身结构设计与实践

Geothermal exploration well structure design and drilling for two geothermal reservoirs

河南WR-1地热勘探井设计有新近系馆陶组和奥陶系2个勘探目的层,需要各自进行成井和测试工作,馆陶组成井测试完成后需要继续钻进完成奥陶系成井。在井身结构设计时,从套管设计、固井结构等方面进行优化改进,解决了馆陶组成井管柱固井、钻孔与套管级配以及过滤器参数设计等问题,并通过实钻验证。本文主要介绍了该地热勘探井井身结构设计过程中需要考虑的重点要素、设计过程等,并结合实钻过程,对井身结构的设计进行了调整和优化,使其更具现场操作性,为其它类似同井双目的层地热勘探井工程提供理论和实践参考。

The WR-1 geothermal exploration well in Henan province is designed for two exploration target zones,the Neogene Guantao Formation and the Ordovician,which is necessary to be completed and tested separately.After the completion of the Guantao Formation well test,it is necessary to continue drilling to complete the Ordovician section.In the design of the wellbore structure,optimization and improvement were conducted on various aspects,including casing design,cementing structure,to address completion tubing string cementing,matching of the wellbore and casing sizes and filter parameter design for the Guantao Formation section,and verified with actual drilling.This paper mainly introduces the key elements that need to be considered and the design process in the design of the geothermal exploration well structure.The design of the well structure was adjusted and optimized in regard to the actual drilling works,so that it will be operable on site and provide theoretical and practical guidance for other similar two geothermal reservoirs exploration wells.