海上油田防砂管柱打捞关键技术

Key technology for sand control tubing fishing in offshore oilfields

高永华 胡晋阳 丁鹏飞 许清海

GAO Yonghua HU Jinyang DING Pengfei XU Qinghai

中海石油(中国)有限公司天津分公司 中海油能源发展股份有限公司工程技术分公司

CNOOC Limited Tianjin Branch, Tianjin 300452, China CNOOC Energy Technology & Services Limited, Drilling & Production Co., Ltd., Tianjin 300452, China

现有的防砂管柱打捞技术对割点位置、井斜和钻具组合对切割作业的影响考虑较少。从打捞防砂管柱的关键环节切割和套铣入手，确定了水力机械切割点位置，对切割时刀片受力进行了计算，并对切割影响因素进行了分析，阐明了套铣防砂管柱的关键技术。研究表明：井斜小于12°，应适当增加钻铤数量来提高钻具旋转稳定性；井斜在12°~55°之间，应减小切割压力、增加钻铤数量、延长切割时间来保障切割作业；井斜大于55°，选择减小切割压力、减少钻铤数量、增加扶正器或者减扭器来提高切割成功率。应用该技术在渤海油田辽东、渤南、渤西区块共进行60余井次防砂管柱打捞作业，大幅度提高了防砂管柱打捞效率和大修作业时效。

The current sand control tubing fishing technology has less consideration for the effects of the cutting position, well inclination and bottomhole assembly on the cutting operation. This research focused on two key points of fishing sand control tubing—cutting and milling and identified the cutting positions of the hydraulic mechanical cutting tool. The force on cutters during cutting was calculated, the factors affecting cutting were investigated, and the key technology for milling of sand control tubing was clarified. The research showed that with well inclination less than 12°, extra drill collars are required to improve the BHA rotation stability; with well inclination of 12°−55°, the reduction of cutting pressure, increase of drill collars, and prolonged cutting time should be adopted; with well inclination above 55°, it is required to reduce the cutting pressure, decrease drill collars, and place extra centralizers or torque reducers to improve the cutting power. Over 60 sand control tubing fishing operations using the presented technology were performed in the Liaodong, Bonan, and Boxi blocks of the Bohai Bay oilfield, which greatly enhances the fishing efficiency of sand control tubing and well intervention time-efficiency.

10.13639/j.odpt.2022.06.015