致密火山岩气藏产能方程修正方法研究与应用

doi:10.13809/j.cnki.cn32-1825/te.2024.02.004

Abstract

Abstract:

The binomial productivity equation is a pivotal tool for analyzing data in gas reservoir development, typically resolved using well test data. However, in tight volcanic gas reservoirs, the pressure remains stable and changes slowly, which can lead to challenges during productivity well tests. Specifically, the indication curve generated from measured data may have an intercept less than 0, rendering the equation unsolvable in its standard form, thereby necessitating a correction to the formula. Taking the Well-C2 of tight volcanic gas reservoir as an example, the reason of abnormal indication curve is analyzed. By reviewing and adapting existing equation correction methods, the bottom hole flowing pressure data from the productivity test well is adjusted, leading to the derivation of a new corrected binomial productivity equation. It is applied to the tight volcanic gas well, and the result is more stable than the result of single-point method. It can fully leverage the well test data and provide the basis for the calculation of open flow capacity and the formulation of subsequent development and production plan.

Key words: tight volcanic gas reservoir, binomial equation, productivity equation correction, abnormal indicator curve, open flow capacity

CLC Number:

TE33

QIU Yixin. Research and application of productivity equation correction method for tight volcanic gas reservoirs[J].Petroleum Reservoir Evaluation and Development, 2024, 14(2): 190-196.

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p_D	q_AOF/10⁴ m³
0.35	8.14
0.66	7.27
0.87	7.62
0.92	6.68

流压/MPa	末点流压变化量/（MPa/d）	稳定趋势
61.39	1.64	未稳定
52.30	1.18	未稳定
40.89	1.37	未稳定
36.81	0.83	未稳定

q_sc/10⁴ m³	C_w_i	(p_e²-p_wf²-C_w)/q_sc
4.40	-475.12	317.40
5.72	-402.40	412.34
7.05	-311.12	472.15
6.35	-278.48	569.07

阶段	起点井口压力/MPa	末点井口压力/MPa	井口压降速率/（MPa/d）	平均日产气量/10⁴ m³
1	46.66	36.95	0.759	6.98
2	53.00	15.05	0.904	5.12
3	14.15	6.20	0.101	2.65
4	6.17	1.60	0.019	1.36

井号	井底流压/MPa	产量/10⁴ m³
C23井	42.1	2.5
	31.6	3.6
	22.7	4.5

Research and application of productivity equation correction method for tight volcanic gas reservoirs

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q_sc/10⁴ m³	p_wf/MPa	C_w_i	(p_e²-p_wf²-C_w_i)/q_sc
2.50	42.10	-242.69	245.51
3.60	31.60	-179.93	360.38
4.50	22.70	-126.74	383.88

阶段	起点井口压力/MPa	末点井口压力/MPa	井口压降速率/（MPa/d）	平均日产气量/10⁴ m³
1	32.6	28.0	0.52	5.28
2	28.0	27.1	0.38	5.30
3	28.1	25.6	0.25	4.46
4	25.6	2.4	0.21	3.35
5	2.0	0.8	0.01	1.53

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