平衡压差解卡法在渤海油田井下作业中的应用

Application of the Balanced Differential Pressure Method in the Downhole Operation of Bohai Oilfield

吴子南 司念亭 龙江桥 唐兵 陈钦伟 石张泽

WU Zinan SI Nianting LONG Jiangqiao TANG Bing CHEN Qinwei SHI Zhangze

中海石油(中国)有限公司天津分公司, 天津 300459

Tianjin Branch of CNOOC Ltd., Tianjin 300459, China

井下作业中，起管柱提不动时一般采用对防砂段以上管柱进行切割，起出切割点以上管柱后再打捞防砂段生产管柱，因打捞的不确定性，导致修井工期延长而增加了费用。此文通过对井下状况的分析，认为生产层封隔器上下的压差产生的吸附力是主要的原因，通过打开井筒与地层通道，解除地层对井筒管柱的吸附压差，成功打捞，节省了工期和费用，为以后类似解卡的井下作业提供了借鉴。

When a fishing operation is needed for a well in which the production string is stuck, the first step is cutting the string above the sticking point and then fishing the left production string in the screen. Due to the uncertainty in fishing operation, the increase in working duration will result in the increase in the cost for a well. Based on the analysis of the down-hole condition, the authors speculated the main cause was the absorption force produced by the differential pressure above and below the production packer. The fishing was successfully completed in a short time by opening the wellhole with the reservoir and releasing the differential pressure between the formation and the string, which reduced the working duration and cost and provides the valuable reference for the similar down-hole operation in the future.

https://doi.org/10.3969/j.issn.1008-2336.2017.01.054