无建槽直井的定向中靶作业

Oriented Target-hitting Operation for Vertical Well without Cavity Building

摘要:

传统的施工水平对接井的连通工艺多采用造腔溶通或压力式连通，由于其施工周期长、成本高等缺点正在被以精确连通仪器引导连通工艺所取代。以江苏淮安SY4井组为例，介绍了采用具有自主知识产权的“慧磁”钻进中靶导向系统，与一口没有建槽的直井进行定向中靶作业。由于存在直井井斜数据误差大、钻具磁化、溶腔半径极小等困难，进行了3次中靶作业后最终成功连通。

Abstract:

Conventionally the intersection between horizontal well and vertical is processed by cavity building or hydropressurizing procedures, which consumes much construction time and costs. Nowadays, the newly developed ranging instrument “Smartmag” can accurately guide the drilling to the target well without need of the cavity building. With the case of well SY4 in Jiansu, the paper introduces “Smartmag” drilling guidance system of the independent intellectual property, which was used in a vertical well without cavity building. Due to the deviation data errors of the vertical wellbore, the drilling tool magnetization and the extremely small cavity, the intersection of the well pair is very difficult and finally achieved by 3 times’ ranging operations.