高3块气顶稠油油藏天然气采收率研究

气顶稠油油藏中稠油和天然气的流动性能相差悬殊，在采油过程中不可避免地会发生油井气窜。由于气窜气量难以准确劈分，目前国内该类油藏气采收率大多以类比法确定，其结果误差相对较大。该文通过对高３块油井气窜气量的准确劈分，把气顶稠油油藏中天然气分解为气顶和稠油溶解气两部分研究。并通过总结在开发过程中气顶总压降与累积产气量关系，得出了高３块稠油气顶气藏的开采特征类似弹性定容气驱气藏的结论，进而应用压降法、物质平衡法、产量统计规律法分别对高３块气顶气和稠油溶解气采收率进行了计算。经多种方法验证，结果较为准确。为今后制定开发技术政策提供了依据。

Gas recovery from heavy oil reservoir with gas cap of Block Gao 3.

The flowing properties of heavy oil and natural gas in heavy oil reservoir with gas cap are distinct.so gas channeling inevitably occurs during oil production. It is difficult to classify the gas volume in the gas cap,so the gas recovery from this kind of oil reservoir is usually determined by analogy method in China.Based on the accurate classification of the volume of gas channeling through oil wells,the natural gas production is studied,by dividing it into cap gas and heavy oil solution gas.According to the relationship between the total pressure drawdown of the gas cap and cumulative gas production during gas production,it follows that the gas production performances in the heavy oil reservoir with gas cap of block Gao 3 are similar with that of elastic gasdrive gas reservoirs with definite volume.The gas recovery from the cap gas and solution gas is calculated by using pressure drawdown method, material balancemethod and production statistics method.The calculation results are proved to be fairly accurate by various methods,providing basis for the determination of development technique in the future.