文72块沙三中注天然气提高采收率物理模拟试验

The Physical Simulation Test of Natural Gas Injection into the Third Member of Wen 72 Fault-Block in Wennan Oilfield for Enhanced Oil Recovery

深层低渗透油藏注水采油末期的开发十分困难 ,主要表现为产出油含水率高、由于异常高压而难以注不进水以及地层亏空等现象。研究表明 ,目前采用气驱技术是动用此类油藏难采储量的很有前途的方法之一。为此 ,进行了文南油田先导试验区文 72块沙三中深层低渗透油藏的注天然气物理驱油试验。结果表明 ,与常规的注水采油相比 ,连续注气可显著地提高注入能力 ,使含水率显著下降 ,并将最终采收率提高 2 2 0 8%。

A physical oil displacement test is performed,in which the natural gas is injected into the deep low permeability reservoir,the third member of Wen 72 Block ,which is the pilot area in Wennan Oilfield.The results show that 86.61% of OOIP can be recovered through natural gas drive in the third member of Wen 72 block as things are at the moment.And the recovery is 22.08% of OOIP more than that of 64.53% by water flood.The method of direct gas injection can improve injection capacity remarkably compared with water flooding.It is suggested that the method of direct natural gas injection should be utilized to recover crude oil in the third member of Wen 72 Block in the case of difficult water injection,by which higher oil recovery can be expected.