五里堠井田煤系气合采产气来源及贡献判识

doi:10.13809/j.cnki.cn32-1825/te.2024.06.017

Abstract

Abstract:

Determining the gas source and contribution in coal measure gas commingled production lays the foundation for developing commingled production schemes. Based on coal measure gas exploration and development data from the Wulihu mining area in the Lu’an mining area, carbon and hydrogen isotope tests of CH₄ from the No. 3+4 coal measure strata and the No. 15 coal seam were conducted. Using a binary gas source model, the gas source and proportions of six commingled wells were identified. Additionally, considering factors such as gas content, permeability, and desorption capacity, the production contributions of gas from the No. 3+4 coal measure strata and the No. 15 coal seam in three commingled wells were calculated based on catastrophe theory. The results showed that when isotopic differences in carbon and hydrogen values were observed between multiple gas-producing layers, these differences could be used to determine the source and proportion of gas from each layer. When the No. 3+4 coal measure strata consistently produced gas while the No. 15 coal seam did not desorb gas, the produced gas entirely originated from the No. 3+4 coal measure strata. When both the No. 3+4 coal measure strata and the No. 15 coal seam stably produced gas, the gas productions were 42%-45% and 55%-58%, respectively. The production split coefficients calculated based on catastrophe theory closely matched experimental results, confirming the feasibility of this method. This study provides a method and reference for accurately identifying gas sources and contributions in coal measure gas commingled production for this mining area.

Key words: coal measure gas commingled well, gas source, gas production contribution, carbon and hydrogen isotopes, catastrophe theory

CLC Number:

TE32

NI Xiaoming,FENG Dong,HAO Shaowei, et al. Gas source and contribution identification for coal measure gas commingled production in Wulihou mining area[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(6): 952-958.

Figures/Tables 12

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Fig. 2

Table 1

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Table 2

Fig. 4

Table 3

Table 4

Common elementary catastrophe theory potential functions"

类型	状态变量	控制变量	势函数	归一化公式
折迭型	1	1	F（x）=x³+W₁x	x_W₁= $W 1 12$
尖点型	1	2	F（x）=x⁴+kx²+φx	x_k= $k 12$ ，x_φ= $φ 13$
燕尾型	1	3	F（x）=x⁵+U₁x³+U₂x²+U₃x	x_U₁= $U 1 12$ ，x_U₂= $U 2 13$ ，x_U₃= $U 3 14$

Table 4

Fig. 5

Table 5

Table 6

Table 7

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井号	3号煤层临界解吸压力/MPa	3号煤层井底流压/MPa	3+4号煤层是否解吸	15号煤层临界解吸压力/MPa	15号煤层井底流压/MPa	15号煤层是否解吸
L-01	1.64	1.17	是	1.30	3.15	否
L-02	1.75	1.32	是	1.35	3.20	否
L-03	1.68	1.40	是	1.42	2.76	否
L-04	1.72	-1.67	是	1.28	0.28	是
L-05	1.66	-1.53	是	1.32	0.16	是
L-06	1.53	-1.61	是	1.42	0.24	是

气样来源	δ¹³C/‰	δ D/‰
3号煤层取心	-37.20	-211.70
4号煤层取心	-37.60	-211.30
15号煤层取心	-39.98	-214.80
L-01井取心	-36.30	-211.70
L-02井取心	-37.80	-210.05
L-03井取心	-36.50	-212.90
L-04井取心	-38.80	-214.40
L-05井取心	-38.85	-213.95
L-06井取心	-38.90	-214.80

阶段	典型井	产气来源占比/%
阶段	典型井	砂岩气层、3+4号煤层	15号煤层
砂岩游离气、 3+4号	L-01井	100	0
	L-02井	100	0
	L-03井	100	0
砂岩游离气、 3+4号、15号	L-04井	45	55
	L-05井	43	57
	L-06井	42	58

数值	层位	煤储层含气性			煤储层渗透性		煤储层解吸性
数值	层位	含气量/（m³/t）	含气饱和度	煤层厚度/m	渗透率/10^-3μm²	孔隙度/%	临储比
原始值	3+4号	10.960 0	0.710 0	2.540 0	0.098 0	3.580 0	0.750 0
	15号	11.850 0	0.770 0	9.720 0	0.111 0	3.840 0	0.480 0
	突变面	10.960 0	0.710 0	2.540 0	0.098 0	3.580 0	0.480 0
归一化	3+4号	0.924 9	0.922 1	0.261 3	0.882 9	0.932 3	1.000 0
	15号	1.000 0	1.000 0	1.000 0	1.000 0	1.000 0	0.630 0
	突变面	0.924 9	0.922 1	0.261 3	0.882 9	0.932 3	0.630 0

层位	煤储层含气性	煤储层渗透性	煤储层解吸性	各产层目标值	产量劈分系数/%
3+4号	0.883 3	0.958 3	1.000 0	0.975 3	42.94
15号	1.000 0	1.000 0	0.794 6	0.981 4	57.06
突变面	0.883 3	0.958 3	0.794 6	0.956 6

Gas source and contribution identification for coal measure gas commingled production in Wulihou mining area

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