长宁页岩气超长水平段水平井钻井完井关键技术

Key Technology for Drilling and Completion of Shale Gas Horizontal Wells with Ultra-Long Horizontal Sections in Changning Block

为了解决长宁区块页岩气超长水平段水平井机械钻速低、钻井周期长和井下安全风险高等技术难点,通过理论分析和软件模拟计算,优化了井眼轨道,优选了钻井设备和套管下入方式,并制定了减振提速、防漏堵漏等降低和消减井下安全风险的技术措施,形成了长宁页岩气超长水平段水平井安全高效钻井完井关键技术。该技术在长宁区块3口超长水平段水平井进行了试验,3口井钻井和完井过程中均未发生井下故障,与未应用该技术的邻井相比,机械钻速提高了2.5%,钻井周期缩短了16.9%。这表明,该技术可以解决长宁区块页岩气超长水平段水平井钻井完井存在的技术难点,满足长宁区块安全高效钻井完井需求,可以在该区块进行推广。

In order to solve the technical difficulties such as low ROP,long drilling cycle and high downhole risks of shale gas horizontal wells with ultra-long horizontal section in the Changning Block,with theoretical analysis and software simulation calculations,the well trajectory was optimized,the proper drilling equipment and casing running methods were selected,and technical measures were taken to reduce downhole risks,such as introducing vibration reduction and acceleration,leak prevention and plugging.These technologies were developed to form a key technology for the safe and efficient drilling and completion of shale gas horizontal wells with ultra-long horizontal sections in Changning Block.The technology had been tested in 3 horizontal wells with ultra-long horizontal section in Changning Block,no downhole failure occurred during drilling and completion,while ROP was increased by 2.5%and drilling cycle was shortened by 16.9%compared with the offset wells.This showed that this technology could solve the challenges in drilling and completion of those shale gas horizontal wells with ultra-long horizontal section in Chang-ning Block,ensure the safe and efficient drilling and completion in Changning Block,and could be popularized in this block.