基于现代产量递减分析的延川南煤层气田剩余气分布数值模拟研究

doi:10.13809/j.cnki.cn32-1825/te.2020.04.004

Abstract

Abstract:

Large difference in productivity and unbalanced development of OGIP（original gas in place） are common issues during CBM production. Based on the production history of south Yanchuan coalbed methane reservoir and A-PDA（advanced production data analysis） method, numerical simulation is employed to study the depressuring degree and the distribution of residual gas as well as the development potential considering the sorption and matrix shrinkage effects. The results show that the 300 m×350 m rectangular well pattern cannot effectively utilize the reserves of CBM, and there is a great difference in the recovery degree of OGIP horizontally. The recovery degree in the northwest is low, and the average drainage radius is only 78 m, which is lower than that in the southeast. Through the mathematical model analysis, the residual gas in place in the northwest parts with the area of 2.8 km ² reached 2.53×10 ⁸ m ³, but the recovery degree is only 4.2 %. From the perspective of influencing factors, the typical remaining gas in the study area are mainly undeveloped well control type and imperfect well pattern type. Infilling well pattern or repeated fracturing can be used for undeveloped well control type, the former can make a raise in recovery degree by 9.6 % according to the numerical model, while for the latter, the well pattern needs to be further improved to promote area pressure reduction. The research provides a guild-line for adjustment disposition and measures.

Key words: CBM（coalbed methane）, residual gas distribution, A-PDA（advanced production data analysis）, numerical simulation, development potential

CLC Number:

TE328

XIAO Cui,WANG Wei,LI Xin,YANG Xiaolong. Numerical simulation of residual gas distribution in CBM gas field of south Yanchuan based on advanced production data analysis[J].Reservoir Evaluation and Development, 2020, 10(4): 25-31.

Figures/Tables 12

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References 22

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参数	取值
初始气藏压力/MPa	9.4 ~ 10.6
煤层厚度/m	4.5 ~ 5.5
孔隙度/%	2 ~ 6
煤层渗透率/10^-3 μm²	0.01 ~ 1.4
气藏温度/℃	42
含气饱和度/%	70
兰氏体积/（m³·t^-1）	37.31
兰氏压力/MPa	4.5
气体综合压缩系数/MPa^-1	0.111
裂缝系统孔隙压缩系数/MPa^-1	1.03×10^-3
煤岩密度/（g·m^-3）	1.4
气体粘度/（mPa·s）	0.014 3
杨氏模量/MPa	3 068
泊松比	0.35

井号	日产气/m³	井底流压/MPa	A-G			Blasingame			NPI			Transient			平均
井号	日产气/m³	井底流压/MPa	渗透率/ 10^-3μm²	有效半缝长/m	泄流面积/10⁴m²	渗透率/10^-3μm²	有效半缝长/m	泄流面积/10⁴m²	渗透率/10^-3μm²	有效半缝长/m	泄流面积/10⁴m²	渗透率/10^-3μm²	有效半缝长/m	泄流面积/10⁴m²	渗透率/10^-3μm²	有效半缝长/m	泄流面积/10⁴m²
A-1	1 104	2.2	0.16	53	4.5	0.23	58	4.8	0.33	55	4.4	0.25	60	4.2	0.24	56.6	4.5
A-2	3 759	1.1	0.32	82	6.0	0.31	91	5.9	0.30	87	5.8	0.30	86	5.6	0.31	86.5	5.8
A-3	930	1.2	0.21	51	3.5	0.12	53	3.7	0.19	57	3.9	0.22	56	3.8	0.19	54.3	3.7
A-4	2 278	1.2	0.20	75	5.2	0.23	72	5.0	0.40	81	5.5	0.14	84	4.8	0.24	78.0	5.1
A-5	3 243	1.2	0.20	65	4.2	0.13	72	4.0	0.30	65	3.9	0.10	64	3.8	0.18	66.5	4.0
A-6	2 937	1.2	0.29	63	7.0	0.20	58	6.5	0.17	62	6.8	0.30	61	6.5	0.24	61.0	6.7
A-7	2 842	1.1	0.12	55	3.5	0.06	56	3.6	0.20	49	3.2	0.16	51	3.8	0.14	52.8	3.5
A-8	2 122	1.2	0.35	77	6.1	0.34	84	6.5	0.29	73	6.0	0.40	86	5.9	0.35	80.0	6.1
A-9	305	1.1	0.10	57	3.0	0.13	50	2.8	0.08	56	2.5	0.06	55	3.0	0.09	54.5	2.8
A-10	201	1.0	0.03	36	1.8	0.03	38	2.0	0.04	32	1.6	0.02	34	1.7	0.03	35.0	1.8

Numerical simulation of residual gas distribution in CBM gas field of south Yanchuan based on advanced production data analysis

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