钻井高风险区域试用三级井身结构水平井的构想

Conception of a threetier horizontal well for highrisk areas

摘要:

针对2017年锦58井区钻井高风险区域漏塌复杂严重及前期油气田使用4 in裸眼预置管柱完井后期治理存在困难等问题，通过室内研究、国内外致密气钻完井技术现状调研及已钻井施工经验总结分析，认为：（1）锦58井区存在窄负安全密度窗口，改变井身结构，实现漏塌分治是现有技术装备条件下经济提速的有效方法；（2）采用悬挂5 in尾管不固井完井，利于气田后期综合治理、储层保护及水平井产能的有效释放。基于以上认识结合环保监测井的客观情况，提出适合锦58井区的井身结构及完井方式，并给出了配套的优快钻完井方案，该构想对推进杭锦旗快速效益上产具有一定的意义。

Abstract:

In view of the complicated and serious leakage and collapse in the highrisk drilling zone in the Jin58 well field in 2017 and the difficulties in the following treatment of oil and gas fields where open holes were completed with preset 4in casing strings in the early period, and with the inhouse research, the survey of tight gas drilling and completion technology status at home and abroad, and the analysis of previous drilling experiences, it is concluded that: (1)there is a narrow negative safety density window at the Jin58 area; therefore the effective method for economic acceleration of ROP is to change the well structure for separate treatment of leakage and collapse under the existing technical and equipment condition; (2)the well is completed with 5in liner hanging down hole without cementing for comprehensive gas field management, reservoir protection and effective release of horizontal well productivity. According to the above conclusions and the actual condition of the environmental monitoring well, the suitable structure and completion method for the Jin58 area are proposed together with the optimal fast drilling and completion plan, which will be of some significance to rapid production in this area.