首页|Experimental study on the feasibility of nitrogen huff-n-puff in a heavy oil reservoir
Experimental study on the feasibility of nitrogen huff-n-puff in a heavy oil reservoir
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Heavy oil reservoirs are much more challenging to be exploited by water flooding than conventional oil reservoirs because of high viscosity. However, gas injection has advantages such as viscosity reduction, oil swelling, extraction, and interracial tension reduction. Furthermore, it is more economical than thermal recovery methods. Previous pressure depletion testing has proved that nitrogen(N2) can form a foamy oil flow in the solution gas drive stage. In addition, crude oil has sufficient mobility under high-temperature conditions in relatively deep, heavy oil reservoirs. In this study, the feasibility of N2 huff-n-puff in heavy oil reservoirs was determined by observing the flow behavior and oil recovery factor through huff-n-puff tests in a two-dimensional planar model and a real-time, high-pressure visual cell. Stable foamy oil flow can be formed, and the overall recovery can reach 35.73 % when the pressure depletion rate was 16 kPa/min. The advantage of nitrogen huff-n-puff is high early production, and the application of nitrogen huff-n-puff in the early stage is not only low in cost but also highly efficient in production. Nitrogen huff-n-puff forms some large-contact-area gas chambers that can enhance the effect of using other high-cost solvents in the later stage. The results of this study can provide some theoretical basis and technical guidance for the application of nitrogen huff-n-puff in relatively deep, heavy oil reservoirs.
Heavy oilNitrogenHuff-n-puffFoamy oilEnhanced oil recovery
Wanfen Pu、Xiang Zhou、Binyang Zou
展开 >
Sate Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, PR China
NSTL
