在油田井下作业中,由于管内蜡卡、抽油杆断脱等原因造成的抽油杆落井打捞井较多,打捞作业时,多采用在油管内打捞或起出油管在套管内打捞方式进行。目前的套管内打捞工具,由于抽油杆断脱位置不同,在现场打捞中常常需要根据起出的抽油杆判断井下落鱼状态,并根据现场情况更换打捞工具。存在现场等停时间长,作业效率低等方面的问题。对此,研究设计了组合式打捞筒,实现了快速高效的打捞,提高了作业效率。

Due to the wear and fatigue of the sucker rod,sucker rod broken,especially in oil well pumping,fishing operation was frequently carried out.At present,fishing tool was suit for solid sucker rod,while fishing hollow sucker rod,two problems exited with low success rate.The paper Introduces structure and operating principle of the side open type hinge overshot of hollow sucker rod.This tool has adopted direct fishing in the tubing,can fish various specifications of the sucker rod and the locking device,and has the advantages of simple operation and high efficiency.

Fracturing in slim hole and casing deformation wells is different from the fracturing in general holes. It needs to be equipped with the downhole tools of minor diameters and wellhead devices resistant to high pressure,reauires a lot on the carrying capacity,anti-shear performance,and the performance of reducing friction. In order to solve the difficulties in fracturing in slim hole and casing deformation wells,according to the specialty of slim hole and casing deformation wells and the reality of minor diameter downhole tools,the Y341-70 packer and K341-98 packer are developed and the design of downhole technique string is accomplished for Ф89 mm and Ф127 mm casing slim hole wells and Ф139.7 mm casing deformation wells. The fracturing fluid and fracturing operation are optimized. The technology is successfully accomplished on more than 40 wells and achieves good effect.