泛指数产量递减模型在评价美国页岩气田井控可采储量中的应用

doi:10.13809/j.cnki.cn32-1825/te.2021.04.001

Abstract

Abstract:

It is generally known that shale layers are the source rock layers of hydrocarbons. The shale gas is a kind of methane gas which is adsorbed on the surface of shale particles. The weight-volumetric method is used to estimate the geological resources of shale gas. Due to the extremely low permeability of the shale, it is represented by the nano Darcy levels （1 nD=10^-9 D=10^-6 mD）, and the adsorbed gas is in a saturated adsorption state. Therefore, the development of shale adsorbed gas requires horizontal well drilling, multi-stage fracturing, depressurization and desorption before putting into production. Since the horizontal well is an independent closed production unit for the shale gas fields, it is necessary to estimate the well-controlled recoverable reserves firstly, and then to estimate the recoverable reserves of the shale gas field. Based on the normalized production decline curve shifting method proposed by Baihly, the well-controlled recoverable reserves and the reserves of the estimation areas from the three large shale gas fields （Barnett, Woodfort, and Haynesville） in the United States have been effectively predicted using the generic exponential production decline（GEPD） model proposed by Chen Yuanqian in recent years. Furthermore, the production decline rate of shale gas wells is theoretically analyzed, and the results completely accord with the actual production decline characteristics of shale gas wells. It shows that the production of a gas well decreases rapidly in the initial stage, and gradually slows down after another 20 months of production. At the same time, five kinds of decline models are studied and estimated in this paper.

Key words: shale gas field, well-controlled recoverable reserves, estimation model, application

CLC Number:

TE328

Yuanqian CHEN,Liang XU,Lining WANG. Applications of the generic exponential production decline model on estimating well-controlled recoverable reserves of shale gas fields in the United States[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(4): 469-475.

Figures/Tables 12

Fig. 1

Fig. 2

Fig. 3

Table 1

Basic data for Woodfort Shale Gas Field"

参数名	矿场应用数值	换算国际单位
埋深	4 700~12 000 ft	1 432~3 658 m
厚度	50~250 ft	15.24~76.22 m
孔隙度	4 %~8 %
渗透率	1~500 nD	10^-6 mD~0.000 5 mD
压力	2 750~6 500 psia	18.9~44.81 MPa
净毛比（NGR）	100 %
TOC	4 %~14 %（质量分数）
R_o（成熟度）	0.8 %~3.5 %
吸附气含量	80~150 scf/t	2.27~4.25 m³/t
法定井占面积	320~640 acres	1.295~2.59 km²
井控可采储量	2~7 Bcf/well	5 663 $×$ 10⁴~19 821 $×$ 10⁴ m³

Table 1

Fig. 4

Fig. 5

Fig. 6

Table 2

Fig. 7

Fig. 8

Table 3

Fig. 9

References 19

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生产时间,t （mon）	归一化q_B		归一化q_W		归一化q_H
生产时间,t （mon）	Mscf/d	10⁴m³/d	Mscf/d	10⁴m³/d	Mscf/d	10⁴m³/d
12	925	2.62	1250	3.54	3200	9.06
24	687.5	1.95	700	1.98	1900	5.38
36	550	1.56	540	1.53	1350	3.82
48	475	1.34	390	1.10	950	2.69
60	412.5	1.17	350	0.99
72	350	0.99	250	0.71
84	337.5	0.95	230	0.65
96	281.3	0.80
108	260	0.74
120	212.5	0.60
132	200	0.57

气田代号	评价区井数	α	β	R²	q_i	c	ECR_30a （10⁴m³）	G_R （10⁴m³）
B	1 138	1.595 5	0.186 9	0.994 8	4.930 8	5.350 6	7 565	8 610
W	413	2.177 8	0.289 4	0.983 4	9.029 5	3.455 4	6 554	6 577
H	570	3.400 2	0.346 8	0.998 9	29.970 0	2.883 5	15 560	16 211

Applications of the generic exponential production decline model on estimating well-controlled recoverable reserves of shale gas fields in the United States

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