海上复杂轨迹井压差卡钻解卡工艺

南海东部地区海上调整井多为水平井，钻井作业过程中极易发生压差卡钻，发生卡钻后，解卡力无法有效传递，解卡困难。为了提高解卡成功率，此文通过从地层性质、井眼轨迹、钻井液性能、操作工艺等方面对海上陆丰13-1油田A井下?177.8 mm套管过程中发生的压差卡钻原因进行分析，采取了机械解卡、浸泡解卡液、海水冲刷的解卡思路和方法，并对其解卡效果进行了评价，最终成功解卡。陆丰13-1油田A井处理压差卡钻的解卡工艺技术，对于其他同类井可以提供很好的施工经验和借鉴。

Stuck Releasing Technology for Differential Pressure Sticking in Offshore Wells with Complex Trajectories

Most of the offshore adjustment wells in the eastern parts of South China Sea are horizontal wells that are prone to differential pressure sticking during drilling operations. In case of sticking, it is difficult to unstuck because forces for stuck releasing cannot be transferred effectively. To improve the success rate of stuck releasing, this paper analyzes the causes of the differential pressure sticking from the aspects of formation properties, the borehole trajectory, the drilling fluid performance and the operation process of well A in the offshore Lufeng 13-1 oilfield while running ?177.8 mm casing. The guidelines and techniques of stuck releasing through mechanical releasing, soaking solution and seawater washing were adopted and their application effects were evaluated in this paper, and it was finally stuck releasing successfully. Stuck releasing technology for differential pressure sticking of well A in the Lufeng 13-1 oilfield can provide good construction experience and reference for wells with similar conditions.