摘要
油田进入开发后期,地下剩余油分布越来越复杂,稳产难度加大。为解决老油田剩余油开发难问题,以大港油田港东开发区二区六断块为研究对象,在精细油藏地质研究的基础上,以沉积岩石学、储集层地质学和测井地质学为理论指导,运用油藏工程和数值模拟等方法开展剩余油分布规律研究,详细描述了该区块高含水率后期剩余油分布特征。根据剩余油分布类型,综合运用渗流力学、数值模拟等手段对开发层系重组、注采井网重建进行了可行性论证,开展针对性的剩余油挖潜研究,提出了在井况差、井网稀疏的部位,通过加密调整动用剩余储量;重塑注采井网,挖掘低渗透带及砂体边部的剩余油,通过改善注水剖面,提高注水波及体积;深化长停井潜力研究,恢复利用停产井,通过转注、恢复注水、大修等进行注采井网的完善等不同的挖潜技术对策。通过针对性实施,提高油层动用程度,增加可采储量,提高最终采收率,进而实现了断块产量保持稳定。
In the late stage of oilfield development,the distribution of underground remaining oil is more and more complex,and the stable production is becoming more and more difficult.In order to solve the problem of developing remaining oil in maturing fields,taking fault block 6 in zone 2 of Gangdong Development Area,Dagang Oilfield as an example,based on the study of fine reservoir geology,and guided by the theory of sedimentary petrology,reservoir geology and logging geology,the remaining oil distribution law was studied by reservoir engineering and numerical simulation,and the distribution characteristics of remaining oil in the later stage of high water cut in this block were described in detail.According to the distribution type of remaining oil,the feasibility of recombination of layer series of development and reconstruction of flood pattern was demonstrated by means of seepage mechanics and numerical simulation.The targeted study on tapping the potential of remaining oil was carried out.In the poor well condition and sparse well pattern,the remaining reserves are produced by infilled adjustment.The remaining oil in low permeability zone and edge of sand body is tapped by remodeling flood pattern.The sweep volume of water injection is increased by improving the profile of water injection.The study on the potential of inactive wells was deepened and shut-down wells were restored and utilized.Flood pattern was perfected by transferring injection,restoring water injection and overhaul,etc.Through the targeted implementation,the production degree of reservoir is improved,the recoverable reserves and ultimate recovery factor are increased,thus achieving stable production of fault blocks.
出处
《录井工程》
2018年第4期83-86,92,103,共6页
Mud Logging Engineering
关键词
剩余油
精细地质研究
开发层系
注采井网
采收率
remaining oil
fine geologic study
layer series of development
flood pattern
recovery factor
