双水平井斜井段导向钻井快速磁测距计算方法

A fast magnetic-ranging calculation method for steerable drilling in bulid-up section of twin parallel horizontal wells

关键词:  蒸汽辅助重力泄油  双水平井  斜井段  邻井距离  磁导向

Key words:  SAGD  twin parallel horizontal wells  build-up section  adjacent well distance  magnetic-ranging

摘要:

双水平井是高效开发重油、油砂和天然气水合物等非常规油气资源的先进井型,具有广阔的应用前景。双水平井斜井段的邻井距离精确测量和精细控制,有助于提高应用蒸汽辅助重力泄油技术开发非常规油气资源的效果。根据TSP-RMRS(two sensor packages-rotating magnet ranging system)的工作原理,以适用于双水平井水平井段的TSP-RMRS测距算法为基础,提出考虑会聚角和异面夹角影响的TSP-RMRS测距算法。通过模拟试验,分析磁短节到两组传感器的轴向距离、会聚角和异面夹角对计算结果的影响。结果表明:当磁短节到两组传感器的轴向距离同时小于等于两组传感器的间距时,磁短节不需要随钻头钻进一定距离,应用TSP-RMRS就可以快速实现双水平井斜井段邻井距离的精确测量。

Abstract:

The pattern of twin parallel horizontal wells is an advanced well type for the efficient development of unconventional oil and gas resources such as heavy oil, oil sands and natural gas hydrates, and has broad application prospective. Accurate measurement and fine control of the adjacent well distance of the twin parallel horizontal wells are essential for the effective application of the steam-assisted gravity drainage (SAGD) technique to develop unconventional oil and gas resources. In this study, based on the principle of the two sensor packages-rotating magnet-ranging system (TSP-RMRS), a TSP-RMRS ranging algorithm considering the influence of convergence angle and off-angle angle was proposed, and the influence of the axial distance, the convergence angle and the angle of the different faces on the calculation results of the well distance was analyzed. The results show that, when the axial distances between the magnetic sub and the two sensor packages are less than or equal to the distance between the two sensor packages and the magnetic sub does not drill a certain distance with the drill bit, accurate measurements of adjacent well distance in the build-up sections of the SAGD wells can be achieved quickly by using the TSP-RMRS calculation method.