塔河河道砂油藏水驱特征及改善水驱技术研究

RESEARCH ON WATER FLOODING CHARACTERISTICS OF CHANNEL SAND RESERVOIR IN TAHE OILFIELD AND IMPROVEMENT OF WATER FLOODING TECHNOLOGY

塔河油田碎屑岩河道砂油藏目前共有10个,采出程度12%,综合含水58.4%,标定采收率27%。目前该类油藏在开发过程中暴露出地层能量不足、部分注采井组动态响应不明确及部分注水井组水窜等问题,整体注水开发效果逐渐变差,且同一河道砂油藏中注水井组间水驱效果差异也较大,亟需针对河道砂油藏开展以井组为研究目标的注水水驱特征和关键影响因素研究,同时针对问题和认识,探索改善河道砂岩油藏注水水驱技术,为下步河道砂油藏改善注水效率提供技术支撑。在地质研究的基础上,选择河道砂油藏典型区块分析注水开发状况,开展注水水驱特征研究;结合油藏地质特征,分析河道砂油藏注水水驱效果影响关键因素;并通过针对影响水驱效果因素,利用油藏数值模拟方法开展河道砂油藏改善水驱技术研究。

There are currently 10 sedimentary sand reservoirs in the Tahe Oilfield, with a recovery rate of 12%,comprehensive water content of 58.4%, and a standard recovery of 27%. At present, the development of this type of reservoir exposes problems such as insufficient formation energy, unclear dynamic response in some injection and production wells, and water flooding in some water injection wells. The overall water injection development effect gradually deteriorates, and the same channel sand reservoir contains. There are also great differences in the water flooding effect between well groups. It is necessary to study the water flooding characteristics and key influencing factors for the study of well sandstone reservoirs for riverbank sand reservoirs. At the same time, aiming at problems and understanding, explore and improve the water injection of sandstone reservoirs in river channels. The flooding technology provides technical support for the improvement of water injection efficiency in the next step sand reservoir. Based on the geological research, this paper selected the typical block of river sand reservoirs to analyze the status of water-flooding development and study the characteristics of water-flooding. Combined with the geological characteristics of the reservoir, this paper analyzed the key factors affecting the waterflooding effect of riverside sand reservoirs and through the use of reservoir numerical simulation methods to improve water-flooding technology for riverbank sand reservoirs in response to factors affecting water-flood effectiveness.