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

Abstract

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

CLC Number:

TE37

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.

Figures/Tables 9

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References 20

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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

A productivity evaluation method of gas wells in condensate gas reservoirs with low permeability

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