海上河流相稠油油田纳米微球多轮次调驱效果评价研究

STUDY ON THE EFFECT EVALUATION OF NANOSCALE MICROSPHERE MULTI-WHEEL DRIVE IN OFFSHORE FLUVIAL HEAVY OIL FIELD

渤海某油田明化镇组具有油层厚度大、平均渗透率高、非均质性较强、原油粘度高的特点。针对稠油油田注水开发容易水窜、含水上升速度快等问题,油田于2009年—2019年开展多轮次纳米微球调驱试验,取得一定的降水增油效果。本文通过建立调驱评价体系,采取注入压力变化、压降曲线和霍尔曲线等方法,对调驱井的注入情况和生产井的见效情况进行评价,井组降水增油效果明显,累积增油11.4×10^(4)m^(3)。该项技术的成功实施,为后期扩大推广提供技术支持。

The Minghua Formation of an oilfield in Bohai Sea has the characteristics of large reservoir thickness,high average permeability,strong heterogeneity and high crude oil viscosity.Aiming at the problems such as easy water channeling and fast rising water cut in heavy oil field in waterflooding development,multi-round adjustment and flooding tests of nano-micro⁃spheres were carried out from 2009 to 2019 to achieve certain effect of precipitation and oil increase.In this paper,through the establishment of the adjustment and flooding evaluation system,the injection pressure change,pressure drop curve and Hall curve were adopted to evaluate the injection situation of the adjustment and flooding well and the effectiveness of the pro⁃duction well.The precipitation and oil increase effect of the well group was obvious,and the cumulative oil increase was 11.4×10^(4)m^(3).The successful implementation of this technology will provide technical support for later expansion and promotion.