Potential Evaluation Of Steam Huff-puff In Super-heavy Oil Reservoir

Heavy crude oil is an important part of oil resource. Since the first application of steam injection technology at the end of the 50's last century, the heavy crude production of the world has been increasing rapidly, currently taking an important position in the entire crude oil production. With the increasing demand of global economy on oil and the development of oil production technologies, a lot of research has been studied on the thermal recovery of super-heavy oil reservoirs. As the most basic way to develop super-heavy oil reservoirs, steam huff and puff still hasmany unclear problems, such as the screening criteria of reservoirs suitable for steam huff and puff and how much recovery potential the reservoir will leave. In this paper, the influence of reservoir geological and fluid parameters on the production effect of steam puff and huff has been studied in detail based on the built economic indicators. And a sensitive analysis on various parameters is also investigated. The ranges of geological and fluid parameters of super-heavy oil reservoirs which are suitable to be developed by steam huff and puff are given. For the Xinjiang Jiu7+8 heavy oil block, the adaptability of the well pattern is studied. On basis of the best heating radius and well spacing density, the well array is optimized. The gas injection parameters are optimized to reach the goal of slowing down the reduction of production and displaying the maximum reservoir recovery potential by steam huff and puff. The simulation results of the optimized scheme show that the final recovery of the block can reach to 15.72% which is 3.63% larger than that the original scheme predicts, and also means a good recovery potential and a positive production.