文南油田文88块天然气驱技术可行性研究

针对文南油田高温高压低渗、特低渗油藏开发难度大,水驱动用状况差、单井产能低等特点,选择了文南油田文88块沙三中油藏开展注气混相驱提高采收率研究,从文南油田文88断块的地质条件出发,根据油藏地质特征、采出程度以及驱替类型,将文88块2口井氮气试注作为先导性试验,以注氮气试验所得到的实践数据为依据,对文南油田文88块深层低渗油藏注天然气驱技术的可行性进行研究。结果表明,文南油田有广泛的天然气资源基础,可以为天然气驱提供较为充足的气源;天然气驱是文南油田提高原油采收率的主攻方向,有着很大的应用前景和潜力;对文88块深层低渗透油藏开展注天然气驱提高采收率在技术和经济上是可行的。

Feasibility of Natural Gas Displacement Technique Used in Block Wen 88 of Wennan Oilfield

In consideration of the characteristics of high temperature and high pressure, low permeability, extra-low permeability reservoirs which are hard to be developed, poor water driving production and low productivity in single well in Wennan Oilfield, reservoirs in the middle member of Es_3 in Block Wen 88 of Wennan Oilfield are selected for studying enhanced oil recovery of miscible displacement by gas drive. Two wells in Block Wen 88 are used for a pilot test of nitrogen injection based on the reservoir geologic characters, recovery percent and type of displacement from the aspect of geologic conditions in Block Wen 88. Based on data obtained from the nitrogen test, a feasibility study is conducted on the gas displacement technique used in low permeability reservoirs in the block. The result shows that there exists wide range of gas resources in Wennan Oilfield, by which sufficient gas resources can be provided for gas displacement. It has wide prospects and potential and feasible for enhancing oil recovery in Block Wen 88.