Natural Gas Exploration and Development

Establishment of “one point method” productivity evaluation formula for overpressured gas reservoirs

CAI Junjun, LIU Wei, ZHOU Fangfang, CHEN Chunzhu

Natural Gas Exploration and Development, 2025, 48(2): 58-68. DOI: 10.12055/gaskk.issn.1673-3177.2025.02.006

气田/气藏	埋深/m	地层压力/MPa	地层温度/℃	压力系数	相对密度
铁山坡	5 400	49.28	87.75	1.34	0.69
八角场	2 987	54.25	87.00	1.79	0.61
高峰场	3 980	64.53	88.87	1.66	0.66
磨溪	3 100	69.05	97.40	2.24	0.53
克拉2^[13]	3 750	74.20	100.00	2.04	0.58
安岳龙王庙组	4 648	76.00	142.15	1.67	0.58
安岳栖霞组	4 200	78.53	133.13	1.88	0.60
大北^[13]	5 576	89.15	127.40	1.68	0.59
双鱼石栖霞组	>7 000	96.00	154.00	1.37	0.56
迪那2^[13]	5 000	106.00	132.00	2.11	0.63
克深2^[13]	6 700	116.42	167.00	1.72	0.57
九龙山	6 021	127.99	144.48	2.19	0.57
克拉苏	6 000~8 000	150.00	190.00	1.72	0.54
Reservior 33^[16]	4 341	79.29	143.33	1.83	0.60
Reservior 70^[16]	4 572	69.84	134.44	1.54	0.69
Reservior 268^[16]	4 145	62.74	116.67	1.52	0.62
Anderson “L”^[17]	3 404	65.55	130.00	1.73	0.67

Table 1 Burial depth and PVT data of typical overpressured gas fields (reservoirs)

Other figure/table from this article

Fig. 1 Relation curves of μZ vs. p and$\frac{p}{\mu Z}$vs. p for typical overpressured gas fields (reservoirs)
Table 2 Multi-point testing data for 44 gas wells
Fig. 2 Pressure-squared binomial relation of Well MX8
Fig. 3 Pressure binomial relation of Well MX8
Table 3 Fitting results of binomial productivity equations in pressure-squared and pressure forms for 44 gas wells
Fig. 4 Fitting relations in pressure form between q_D and p_Dof 44 gas wells
Fig. 5 Fitting relations in pressure-squared form between q_D and p_Dof 44 gas wells
Table 4 Comparison of errors in productivity evaluation
Fig. 6 Comparison of errors in productivity calculation for gas wells with small drawdown pressure