丹凤场气田致密砂岩气水渗流特征及影响因素

doi:10.13809/j.cnki.cn32-1825/te.2022.02.011

Abstract

Abstract:

In order to understand the influence of displacement pressure on the gas flow capacity for different types of reservoirs and clarify the reasonable production pressures of different types of reservoirs, the tight sandstones of the main reservoir type Ⅱ and Ⅲ in the Xujiahe Formation of Danfengchang Gas Field are taken as the research object. And with the help of the NMR technology, the gas-flooding experiments of the tight rock samples of the two types of reservoirs under different displacement pressures are carried out to analyze the effect of displacement pressure on the gas flow capacity. The results show that the the pore structure and the displacement pressure difference have different effects on the gas flow characteristics of the rock samples in type Ⅱ and type Ⅲ reservoir. The gas flow characteristics of the rock samples in type Ⅱ reservoir are mainly affected by the displacement pressure difference. The greater the displacement pressure difference, the stronger the gas flow ability. And it mainly affects the flow ability in the small pore throat. While the pore structure and displacement pressure difference of type Ⅲ reservoir rock samples affect the gas flow characteristics together. When the capillary pressures of the layers are close to each other, the gas flow capacity is the best. Therefore, for tight sandstones in different types of reservoirs in Danfengchang Gas Field, the best production pressure should be used to achieve the best gas flow capacity during production.

Key words: gas-water two-phase flow, NMR（nuclear magnetic resonance）, microscopic pore structure, tight gas reservoir, Xujiahe Formation

CLC Number:

TE311

YANG Yubin,XIAO Wenlian,HAN Jian,GOU Ling,LI Min,ZHOU Keming,OUYANG Mukun,CHEN Li. Gas-water flow characteristics and influencing factors of tight sandstone in Danfengchang Gas Field[J].Reservoir Evaluation and Development, 2022, 12(2): 356-364.

Figures/Tables 10

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References 23

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岩样编号	岩样长度（cm）	岩样直径（cm）	渗透率（10^-3μm²）	孔隙度（%）	储层类型	参考驱替压差（MPa）	实验驱替压差（MPa）
DQ001-1-12	5.84	2.55	0.795	9.30	Ⅱ	1.30	0.70
DQ001-1-13	5.50	2.48	0.784	9.72		1.34	1.30
DQ001-1-14	5.76	2.46	0.759	8.89		1.30	2.00
DQ001-1-22	5.62	2.53	0.254	8.82	Ⅲ	2.24	1.20
DQ001-1-26	5.78	2.55	0.261	8.73		2.20	2.20
DQ001-1-27	5.68	2.53	0.259	8.71		2.20	3.10

储层类型	岩样编号	驱替压差Δp	残余水下气相相对渗透率	残余水饱和度（%）	等渗点处相对渗透率	等渗点饱和度（%）
Ⅱ类储层	DQ001-1-12	小于p_c	0.40	48.84	0.013	71.02
	DQ001-1-13	趋向于p_c	0.65	34.21	0.013	69.00
	DQ001-1-14	大于p_c	0.99	30.34	0.014	66.07
Ⅲ类储层	DQ001-1-22	小于p_c	0.13	67.35	0.008	85.00
	DQ001-1-26	趋向于p_c	0.48	40.31	0.009	70.11
	DQ001-1-27	大于p_c	0.16	47.45	0.003	74.00

储层类型	岩样编号	最小可动流体横向弛豫时间
储层类型	岩样编号	下限（ms）	上限（ms）
Ⅱ类储层	DQ001-1-12	0.28	102.00
	DQ001-1-13	0.17	105.00
	DQ001-1-14	0.10	101.00
Ⅲ类储层	DQ001-1-22	0.16	98.00
	DQ001-1-26	0.10	46.42
	DQ001-1-27	0.07	56.94

Gas-water flow characteristics and influencing factors of tight sandstone in Danfengchang Gas Field

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