水平分支井在海上稠油开发中的应用

Application of horizontal multilateral wells in offshore heavy oil development

针对海上油田开发要求单井累产高的特点,渤海稠油油田创新应用水平分支井整体开发,油井初期产能达到普通定向井多层合采的3倍以上,大幅度地提高了油井产能。结合实际效果,对水平分支井产能与分支数目、边底水距离、原油黏度等因素关系进行了深入分析。研究发现:原油黏度越大,水平分支井与定向井的产能倍数越大;增加分支个数,可以增加油井产量;与边底水距离越近,初期产能越高等认识,同时深入分析其开发规律,指出开发中面临的问题,可有效指导相似油田开发。

Aiming at the characteristic that development of offshore oilfield require high single well cumulative production, Bohai heavy oilfield innovatively applied horizontal multilateral wells for the whole development. At the early stage, the oil well productiv-ity could be above 3 times of that of multi-layer production of common directional wells, which substantially improved the well pro-ductivity. Combined with the actual results, relation of productivity, branch amount, distance between edge water and bottom water, and oil viscosity of horizontal multilateral wells was deeply analyzed. The study found that the high the oil viscosity is, the larger the productivity multiples of horizontal multilateral wells and directional wells is. The increasing of branch amount can increase the oil capacity. The closer the distance to the edge water and bottom water is, the higher the initial productivity is. Meanwhile, that the development law was also deeply analyzed and the problems existed in the development were pointed out could effectively guide the development of similar oilfields.