海上稠油边底水油田氮气泡沫驱技术试验研究与应用

The Bohai offshore heavy oil and bottom water oilfield indoor experimental research and application of nitrogen foam flooding technology

目前渤海海上稠油边底水油田经过长期注水开发,指进现象严重,窜流通道导致注入水低效循环的现状,油田的主要矛盾及对策:由于地层非均质性、油水黏度差异导致主力层注水水窜,波及体积小,油藏采出程度低,注水调驱(扩大水驱波及体积)势在必行。本文通过对秦皇岛32-6油田的油藏研究,结合氮气泡沫调驱筛选原则,通过针对性的研究,建立了适合秦皇岛32-6油田氮气泡沫调驱的氮气泡沫体系,同时应用物理模拟和数值模拟结果,结合秦皇岛32-6油田油藏地质特点,进行氮气泡沫调驱工艺方案研究与优化,开展了氮气泡沫控水技术的室内研究和矿场先导试验。结果表明:氮气泡沫控水技术能够有效封堵稠油边底水油田开发中后期疏松砂岩形成的大孔道,改变液流方向,提高注入水利用率,扩大注入水波及体积,达到稳油控水的目的,能够显著改善水驱开发效果。

The Bohai offshore heavy oilfield after a long period of water injection development, edge-bottom water fingering phenomenon is serious,channeling circulation way lead to the present situation of the injected water inefficient circulation, oilfield the main contradic- tions and countermeasures,because the formation heterogeneity,oil/water viscosity differences lead to main layer water injection water channeling,swept volume is small, low degree of reservoir,water flooding displacement （enlarge sweep volume water drive） is imperative.This article through to research of Qinhuangdao 32-6 oilfield reservoir,and combining with nitro- gen foam displacement selection principle, through targeted research,Qinhuangdao 32-6 oil field has been established nitrogen foam fooding of nitrogen foam system,application of physical simulation and numerical simulation results at the same time,the combination of Qinhuangdao 32-6 oilfield reservoir geological characteristics, for nitrogen foam flooding pro- cess research and optimization,a technique of nitrogen foam water control indoor research and field pilot test.Results show that the nitrogen bubble water control technology can effectively block edge of heavy oil development of loose sand formation in the second half of the bottom water oilfield development macroscopic throats,change flow direction,to improve the utilization rate of injected water, sweep volume expansion of injected water, and achieve the goal of sta- bilizing oil water control,can significantly improve water flooding development effect.