摘要
苏丹地区主要油藏类型为中高孔渗砂岩油藏,投产以来利用天然能量衰竭式高速开发,形成了以"稀井高产、大压差生产、延迟加密和注水、快速回收投资"为特征的天然能量开发技术政策。H油田、FN油田和P油田分别为强底水稀油油田、强底水稠油油田和层状边水高凝油油田,在苏丹地区具有代表性。3个油田的开发特征表现为稀井高产、采油速度高、稳产时间短,含水上升快、产量递减大,大段合采、层间矛盾突出和剩余油分布复杂等。结合实验室研究、现场动态监测和方案研究等手段对开发效果影响因素进行分析。结果表明:高采油速度有利于提高合同期采出程度和采收率;根据原油流度范围部署稀井网,结合合同条款确定加密单井产量下限值有利于实现技术经济优化;利用隔夹层阻隔底水可延缓底水锥进,实现底水油田有效开发;层状高凝油油藏推迟注水不影响合同期采出程度。
Most reservoirs in Sudan are medium to high porosity and permeability sandstone reservoirs, these reservoirs have been developed by natural depletion since put into production, and the development is characterized by sparse wells of high production, big pressure differential, delayed infill drilling and water flooding, and rapid investment recovery. H field, FN field and P field are bottom water drive light oil field, bottom water drive heavy oil field and stratified high pour point oil field respectively, and they are representative fields in Sudan. The production performance of the three oil fields features sparse well spacing and high plateau rate, short stable production period, rapid water cut increase and fast production decline. Commingled production results in poor inter-layer development and complicated residual oil distribution. On the basis of the above analysis, major affecting factors of Sudan sandstone reservoirs natural drive have been identified through lab experiments, field development plan and field monitoring. The high off-take rate is conducive to the increase of the contract period recovery and recovery factor; sparse well spacing based on crude mobility range and determining infill well production cutoff considering contract terms can be helpful for cost-effective development; barriers and inter-layers can be made use of to detain bottom water coning and to enhance the development effect of bottom water oilfields; and delayed water injection in stratified high pour point reservoirs has no effect on recovery factor during contract period.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2015年第3期347-351,共5页
Petroleum Exploration and Development
关键词
砂岩油藏
衰竭式开发
开发特征
开发技术政策
苏丹地区
sandstone reservoir
depletion development
development characteristics
development policy
Sudan
