杜229块蒸汽驱窜流调控技术研究与应用

Research and Application of Control Technology in Du 229 Block Steam Flooding and Channeling

杜229块超稠油油藏蒸汽驱试验区井组自转驱以来,部分生产井出现了蒸汽窜流突破,造成油井温度高、产液高、含水高、产油量低等开发矛盾,影响了蒸汽驱开发效果。分析认为主要影响因素为各单井井距大小、转驱前采出程度不同;井组储层物性差异大,非均质性强;地层倾角大、蒸汽超覆作用;井网局部不完善。从提高注汽效率和改善回采效果两方面入手,研究应用了动态调整注汽参数,吞吐引效,控制套压,对生产井调剖、暂关,调整机采工作参数,大修、侧钻、补钻更新井以完善井网,同心双管分注,化学调驱等技术手段进行动态调控。研究达到了改变蒸汽窜流走向,抑制蒸汽突破,使井组区域蒸汽均衡扩展的目的。

In steam flooding test area well group of Du 229 block ultra heavy oil reservoir, steam channeling breakthrough appears in some production wells since rotation drive, which results in such problems in subsequent development as high temperature, high fluid production, high water content and low oil production and affects development efficiency of steam flooding. Analysis results show that such factors have significant effect on development efficiency as each single well spacing, exploitation degree before flooding, well group reservoir physical property difference, anisotropy, dip angle, steam overlap effect and well pattern part imperfection. In order to enhance steam injection efficiency and improve recovery effect, applied are a series of technological means to conduct dynamic control on the well pattern and such purposes are reached finally as steam channeling direction change, steam breakthrough inhabitation and well group area steam balance extension.