The gas recovery of water-drive gas reservoirs

被引:7
|
作者
Li Min [1 ]
Li Tao [1 ]
Jiang Qiong [1 ]
Yang Hai [1 ]
Liu Shi-chang [1 ]
机构
[1] Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Peoples R China
基金
中国国家自然科学基金;
关键词
water-drive gas reservoirs; degree of reserve recovery; water influx coefficient; evaluation table; demarcation charts;
D O I
10.1016/S1001-6058(15)60513-3
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
This paper proposes a method for determining the gas recovery of water-drive gas reservoirs. First, the water influx coefficient B in the theoretical formula p(r) = (1-R-g)/(1-R-g(B)) is used to determine the influence of the aquifer behavior. According to the theoretical formula, the relationship between the normalized pressure p(r) and the degree of the reserve recovery R-g can be obtained with different values of B, which can be used to determine the activity level of the aquifer behavior. Second, according to p(ra) = (1-R-ga)/(1-aE(va)) (where a = 1-S-gr/S-gi), the relationship between the normalized abandonment pressure p(ra) and the ultimate gas recovery R-ga can be obtained, as the Agarwal end-point line. The intersection of the above two lines represents the value of the estimated ultimate gas recovery and the normalized abandonment pressure p(ra). Finally, an evaluation table and a set of demarcation charts are established, with different values of S-gr/S-gi and E-va as well as the water influx coefficient B, which can be used to determine the gas recovery of water-drive gas reservoirs with different activity levels of the aquifer behavior.
引用
收藏
页码:530 / 541
页数:12
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