Discussion on Shale Gas Horizontal Drilling Technology in Southern Sichuan
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摘要: 川南探区存在地层古老、可钻性差、机械钻速慢、钻井成本高及投资收益低等问题，为实现该探区页岩气高效勘探开发，在分析探区工程地质及钻井工程技术难点的基础上，结合页岩气储层改造技术要求，开展了井身结构方案优化、优快钻井技术以及经济成本分析，形成了以ø139.7 mm套管完井的三开钻井技术方案，指导完成了WY1井、YY1井等探井的设计，为川南探区第一轮页岩气勘探提供了技术指导。Abstract: The exploration area in Southern Sichuan is present in ancient strata,where difficulties such as poor drillability,slow penetration rate,high drilling cost and low investment return exist.To achieve an efficient shale gas exploration in this exploration area,we carried out activities including well structure optimization,optimal and fast drilling technology and economic cost analysis on the basis of analyses on drilling technical difficulties in the exploration area and shale gas reservoir stimulation technology requirements.As a result,a drilling program based on three times of spudding and completion with ø139.7 mm casings was developed,which guided the design of WY1 and YY1 exploratory wells successfully and provided technical guidance for the first round shale gas exploration in Southern Sichuan.
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Keywords:
- shale gas /
- horizontal well /
- drilling /
- Southern Sichuan
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