油藏自流注水开发机理及影响因素分析  

Development mechanisms and influencing factors of dump flooding

作　　者：苏海洋[1] 穆龙新[1] 韩海英[1] 刘永革[2] 李波[1] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油大学(华东)

出　　处：《石油勘探与开发》2015年第5期632-637,共6页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司重大科技专项"中东地区碳酸盐岩油藏整体优化部署及提高采收率技术研究与应用"(2011E-2501)

摘　　要：针对自流注水开发现有理论还不够成熟的问题,研究了自流注水需要满足的油藏条件,定义了"自流注水门限压力"的概念,并根据流体力学和油藏工程的基本原理建立了其表达式,提出了自流注水过程中注水量、产油量、水层压力、油层压力、累计注水量和累计产油量等参数的计算方法。根据提出的计算方法编制了相应的计算程序,并运用程序进行了自流注水实例计算和影响因素分析,结果表明,提出的自流注水计算方法原理简单,计算结果合理,能够用于自流注水参数计算;在水油储量比小于60时,自流注水稳产期随水油储量比的增大而延长,采收率随水油储量比的增大而增大,但在水油储量比超过60后,水油储量比的影响不明显;自流注水时机对油田开发稳产期和采收率有重要影响,自流注水时机越晚,地层能量的利用越充分,稳产期越长,采收率也越高。Aiming at the problem that the theory of dump flooding is not mature, this study examined the suitable reservoir conditions for dump flooding, defined the concept of ＂dump flooding threshold pressure＂ and its expression based on fluid mechanics and reservoir engineering fundamentals, and proposed the computing method of water injection rate, producing rate, water layer pressure, oil layer pressure, cumulative injection and cumulative production. It gave the corresponding computing program according to the proposed computing method, and made a case study and analyzed the factors affecting dump flooding using the program. The dump flooding computing methods are reasonable and applicable; when water reserve-oil reserve ratio is less than 60, production plateau extends with and oil recovery increases with the increase of water reserve-oil reserve ratio, when water reserve-oil reserve ratio is more than 60, the effect of the ratio of water reserve to oil reserve is negligible; the timing of dump flooding has a significant effect on production plateau and oil recovery, the later the dump flooding injection timing, the more completely the formation energy will be used, the longer the production plateau and the higher the recovery will be.

关 键 词：自流注水 开发机理 门限压力 稳产期 采收率 注水时机 

分 类 号：TE341[石油与天然气工程—油气田开发工程]