低压高含水致密气藏气-水相渗特征及生产动态响应

doi:10.13809/j.cnki.cn32-1825/te.2024.01.019

Abstract

Abstract:

The gas-water relative permeability curve reflects the comprehensive physical properties of the reservoir. Clarifying the relationship between the gas-water relative permeability behavior of tight sandstone and the production performance of gas wells is conducive to the efficient development of tight gas reservoirs. Taking the typical tight sandstone gas reservoirs in the eastern margin of Ordos Basin as the research object, the reservoirs are divided into three types and gas-water relative permeability experiments are carried out. Combined with core analysis methods such as X-ray diffraction, scanning electron microscopy and nuclear magnetic resonance, the relationship between gas-water relative permeability and gas well production performance curve is revealed. The results show that: ① The two-phase transition zone of relative permeability curve I is wide, the pore type of which is mainly intergranular pores. The two-phase transition zone of relative permeability curve Ⅱ is narrow, the pore types of which are mainly intergranular pores and intergranular pores. The two-phase transition zone of relative permeability curve Ⅲ is extremely narrow, and the pore type is mainly dominated by intergranular pores; ② The clay mineral content is high. kaolinite and chlorite are conducive to gas-water phase flow. Illite is not conducive to gas-water phase flow; ③ The pore and throat of in the reservoir have large differences and can be roughly divided into three categories: large pores（greater than 1.0 μm）, mesopores（0.1~1.0 μm） and small pores（less than 0.1 μm）. The large pores in the reservoir of class I, Ⅱ and Ⅲ account for about 40%, 10%, and 4%, respectively; ④ The gas wells can be divided into three types, the production performance of which are consistent with the predicted results of the relative permeability curves. The main production layer of the well of class I responds to the reservoir of class I. The effective layer thickness is about 7 m. The average daily production is about 2×10⁴ m³ with a long stable production period. The main production layer of the well of class Ⅱ responds to the reservoir of class Ⅱ. The effective layer thickness is about 5 m. The average daily production is about 1×10⁴ m³. The main production layer of the well of class Ⅲ responds to the reservoir of class Ⅲ. The effective layer thickness is about 6 m. The average daily production is about 0.5×10⁴ m³ with a very short stable production period. By analyzing the gas-water relative permeability characteristics to predict gas well production dynamics, the impact of pore structure and clay minerals on gas-water flow behavior is revealed. This can provide theoretical support for developing measures to reduce resistance and enhance efficiency in the development process of low-pressure, high-water-content tight gas fields.

Key words: tight sandstone, gas-water relative permeability, pore structure, clay mineral, production performance

CLC Number:

TE312

GUO Zhidong, KANG Yili, WANG Yubin, GU Linjiao, YOU Lijun, CHEN Mingjun, YAN Maoling. Gas-water relative permeability characteristics and production dynamic response of low pressure and high water cut tight gas reservoirs[J].Petroleum Reservoir Evaluation and Development, 2024, 14(1): 138-150.

Figures/Tables 17

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类型	孔隙度/%	渗透率/10^-3 μm²	中值半径/μm	排驱压力/MPa	最大孔喉半径/μm	分选系数
Ⅰ类	>12	>1.0	>0.20	<0.5	>1.5	<1.5
Ⅱ类	6~12	0.1~1.0	0.05~0.20	0.5~1.5	0.5~1.5	1.5~2.5
Ⅲ类	<6	<0.1	<0.05	>1.5	<0.5	>2.5

样号	长度/cm	直径/cm	孔隙度/%	渗透率/10^-3 μm²	类型
DJ-1	5.12	2.51	8.39	9.65	Ⅰ
DJ-2	4.94	2.52	9.90	1.40
DJ-3	5.12	2.51	11.73	1.87
DJ-4	5.13	2.53	15.90	0.33	Ⅱ
DJ-5	4.88	2.51	8.69	0.45
DJ-6	5.06	2.51	8.07	0.45
DJ-7	4.94	2.51	7.56	0.15	Ⅲ
DJ-8	5.04	2.52	5.81	0.19
DJ-9	5.11	2.51	5.80	0.15

样号	孔隙度/ %	渗透率/ 10^-3 μm²	束缚水饱和度/%	束缚水气相相对渗透率
DJ-1	8.39	9.52	33.30	0.67
DJ-2	9.90	1.38	40.46	0.57
DJ-3	11.73	1.85	39.26	0.52
DJ-4	15.90	0.33	57.32	0.21
DJ-5	8.69	0.44	58.11	0.18
DJ-6	8.07	0.45	69.65	0.28
DJ-7	7.56	0.15	78.01	0.10
DJ-8	5.81	0.19	69.65	0.28
DJ-9	5.80	0.15	70.17	0.04

类别	S_wi/%	K_rg（S_wi）	S_x/%	K_x（S_x）	S_gi/%	K_rw（S_gi）
Ⅰ	33.56	0.551	58.78	0.121	0	1.000
Ⅱ	59.35	0.110	68.25	0.023	20.32	0.176
Ⅲ	73.23	0.114	78.93	0.028	18.74	0.065

类别	井号	孔隙度/ %	渗透率/ 10^-3μm²	平均日产气量/m³	平均日产水量/m³	主力层厚/m
Ⅰ	DJ-A	12.66	1.32	10 450.18	6.98	7.22
Ⅱ	DJ-B	10.92	0.31	7 792.74	4.27	5.01
Ⅲ	DJ-C	6.11	0.12	5 874.51	1.21	5.98

Gas-water relative permeability characteristics and production dynamic response of low pressure and high water cut tight gas reservoirs

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