一种低渗储层凝析气藏气井产能评价方法研究

doi:10.13809/j.cnki.cn32-1825/te.2021.05.009

摘要/Abstract

摘要：

采用常规二项式产能方程对渤海某高含凝析油的低渗厚层凝析气藏气井进行产能分析,得到负的产能方程系数B,校正压力后产能方程系数B仍为负,因此,该产能方程不能用于气井产能分析。为得到气井合理产能方程,首先采用高速非达西渗流判定准则和产能方程系数B理论计算,证实本气井高速非达西可忽略不计,且地层压力和井底流压也需校正;然后基于不存在高速非达西的产能方程进行回归,得到了修正的产能方程;最后采用指数式产能方程进行验证,由其计算的无阻流量（Q_AOF）与修正产能方程计算的Q_AOF基本一致。将该方法应用在实际低渗凝析气田气井,能得到合理的气井产能方程,表明了修正产能方程的有效性。

关键词: 低渗, 凝析气藏, 校正, 高速非达西, 产能方程

Abstract:

When the conventional binomial productivity equation is used to analyze the deliverability of the gas wells in a low permeability thick layer condensate gas reservoir with high condensate content in Bohai Sea, the negative deliverability equation coefficient B can be obtained, which is still negative after pressure correction. Therefore, this equation is not suitable for the gas well productivity analysis. In order to obtain the reasonable productivity equation of the gas well, the following measures are taken. Firstly, the judgment criterion of high-speed non Darcy seepage and the theoretical calculation of productivity equation coefficient B are used to confirm that the high-speed non Darcy of the gas well is negligible, and the formation pressure and bottom hole flow pressure also need to be corrected. Then, the modified productivity equation is obtained without high-speed non Darcy productivity equation. Finally, the exponential productivity equation is used for verification, and the calculated Q_AOF（open flow, the same below） is basically consistent with the Q_AOF the modified productivity equation. When this new method is applied to the actual gas wells in low permeability condensate gas fields, a reasonable gas well productivity equation can be obtained, which shows the effectiveness of the modified productivity equation.

Key words: low permeability, condensate gas reservoir, correction, high speed non-Darcy, deliverability equation

中图分类号:

TE37

谭先红,梁斌,王帅等. 一种低渗储层凝析气藏气井产能评价方法研究[J]. 油气藏评价与开发, 2021, 11(5): 724-729.

Xianhong TAN,Bin LIANG,Shuai WANG, et al. A productivity evaluation method of gas wells in condensate gas reservoirs with low permeability[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(5): 724-729.

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测试号	厚度（m）	油嘴（mm）	产量（m³/d）		压力（MPa）
测试号	厚度（m）	油嘴（mm）	油	气	井底流压	地层压力	生产压差
1	66	6.35	85.86	117 800	40.01	45.9	5.88
		7.94	127.98	168 100	36.91		8.99
		9.53	155.34	218 000	33.92		11.98
		11.11	191.22	271 700	31.43		14.47

油嘴（mm）	产量（m³/d）		压力（MPa）
油嘴（mm）	油	气	井底流压	校正流压	反凝析压降
6.35	85.86	117 800	40.01	40.12	0.11
7.94	127.98	168 100	36.91	37.03	0.12
9.53	155.34	218 000	33.92	34.05	0.13
11.11	191.22	271 700	31.43	31.57	0.14

油嘴（mm）	时间（h）	产量（m³/d）		压力（MPa）
油嘴（mm）	时间（h）	油	气	井底流压	校正流压	反凝析压降
6.11	14	111.47	100 000	38.46	38.85	0.39
8.61	13	185.24	150 000	37.51	37.92	0.41
10.28	16	213.13	200 000	36.41	36.83	0.42
12.38	23	272.84	250 000	34.41	34.85	0.43
14.29	26	294.22	300 000	33.36	33.82	0.46