复杂煤层气井修井原因分析及检杆工艺试验

井筒复杂、深度超过1 100 m 的煤层气定向井在生产过程中修井频繁，而常规检泵修井工艺难以满足实际生产需要。针对这一问题，对C 区块50 口煤层气井的修井原因进行了对比分析，结果表明油管漏失、泵故障、抽油杆断脱是导致频繁修井的主要原因，而机械磨损和腐蚀严重是修井的主要影响因素。在此基础上针对性地提出了检杆修井这种新的作业方式，即通过修井井史分析，预测井下设备运行状态，在躺井前不动油管柱，只提出抽油杆柱进行优化。检杆作业由井下设备服役状态预测、配套工艺、施工运行构成一套工艺措施，具有工艺简单、施工时间短、投入产出比高的特点。现场应用效果表明检杆工艺是一种适合复杂煤层气井的经济有效的修井技术。

Analysis on the workover reasons for complex CBM well and test on rod checking technology

Workover is carried out frequently when complex coalbed methane (CBM) directional wells of over 1 100 m deep are in operation. However, the conventional workover technologies by pump inspection can not deal with this purpose effectively. Under this background, the reasons for the workover of 50 CBM wells in Block C were analyzed and compared. It is shown that tubing leakage,pump failure and sucker rod dropout are the main reasons for frequent workover, and mechanical wear and serious corrosion are the dominant influential factors of workover. Then, a new operation mode which is about rod testing workover, was proposed. The rod testing operation is a suite of technical measures, including downhole equipment service state prediction, supporting techniques and construction and operation. It is characterized by simple process, short construction period and high input/output ratio. Field applications have demonstrated that the rod testing is an economical and effective workover technology suitable for complex CBM wells.