Technical strategies for effective development and gas recovery enhancement of a large tight gas field: A case study of Sulige gas field, Ordos Basin, NW China

Ji, Guang; Jia, Ailin; Meng, Dewei; Guo, Zhi; Wang, Guoting; Cheng, Lu; Zhao, Xin

doi:10.1016/s1876-3804(19)60043-1

Cited by 50 publications

(11 citation statements)

References 6 publications

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“…where q is the flow rate, m 3 ·s −1 ; A is the cross-sectional area of core, m 2 ; K a is the apparent permeability of core, µm 2 ; K is the permeability of core, µm 2 ; µ is the viscosity of gas, mPa·s; Z is the deviation coefficient of gas, the gas is considered as an ideal gas, and the value of Z is 1 in this experiment; λ is the TPG of gas, MPa·m −1 ; L is the length of core, m; p 1 and p 2 are the pressures at the inlet and outlet of the core, respectively, MPa. Therefore, according to the experimental data, the apparent permeabilities (K a ) under different experimental conditions could be calculated using Equation (1). Then, the relationship Energies 2019, 12, 4578 5 of 13 curves between K a and 1/(p 1 − p 2 ) could be plotted according to Equation (2), the linear fitting could be carried out for these curves, and the TPGs were obtained according to the slopes of the fitted lines.…”

Section: Tpg Calculation Methodsmentioning

confidence: 99%

“…Energies 2019, 12, x FOR PEER REVIEW 5 of 13 of the core, respectively, MPa. Therefore, according to the experimental data, the apparent permeabilities (Ka) under different experimental conditions could be calculated using Equation (1). Then, the relationship curves between Ka and 1/(p1 − p2) could be plotted according to Equation (2), the linear fitting could be carried out for these curves, and the TPGs were obtained according to the slopes of the fitted lines.…”

Section: Mineral Compositionsmentioning

confidence: 99%

“…Tight gas reservoirs have been the highest potential exploration and development field of natural gas in China [1,2]. The resources of tight gas reservoirs are abundant in China, and mainly distributed in Sichuan, Ordos, Songliao, Qaidam, Bohai Bay, Tarim and Junggar basins [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Threshold Pore Pressure Gradients in Water-Bearing Tight Sandstone Gas Reservoirs

et al. 2019

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Tight gas reservoirs commonly occur in clastic formations having a complex pore structure and a high water saturation, which results in a threshold pressure gradient (TPG) for gas seepage. The micropore characteristics of a tight sandstone gas reservoir (Tuha oilfield, Xinjiang, China) were studied, based on X-ray diffraction, scanning electron microscopy and high pressure mercury testing. The TPG of gas in cores of the tight gas reservoir was investigated under various water saturation conditions, paying special attention to core permeability and water saturation impact on the TPG. A mathematical TPG model applied a multiple linear regression method to evaluate the influence of core permeability and water saturation. The results show that the tight sandstone gas reservoir has a high content of clay minerals, and especially a large proportion of illite-smectite mixed layers. The pore diameter is distributed below 1 micron, comprising mesopores and micropores. With a decrease of reservoir permeability, the number of micropores increases sharply. Saturated water tight cores show an obvious non-linear seepage characteristic, and the TPG of gas increases with a decrease of core permeability or an increase of water saturation. The TPG model has a high prediction accuracy and shows that permeability has a greater impact on TPG at high water saturation, while water saturation has a greater impact on TPG at low permeability.Energies 2019, 12, 4578 2 of 13 nanometer, which strongly affects the seepage ability of gas in tight gas reservoirs [6]. In addition, it also has a characteristic of high water saturation in tight gas reservoirs, the influence of water saturation on gas seepage is very significant, and a complex relationship between water and gas will be formed [7]. The water in the pores of tight gas reservoirs forms a thin hydration film at the small pore throats, or small water droplets gather and block at the throats to produce the Jamin effect of gas seepage, which will increase the seepage resistance of gas [8][9][10]. These make gas seepage show a characteristic of non-linear seepage and a threshold pressure gradient (TPG) phenomenon in water-bearing tight gas reservoirs [11,12]. Therefore, on the basis of recognizing their micropore structures, it is necessary to study the TPG characteristic of gas in water-bearing tight gas reservoirs.The TPG of gas in water-bearing tight gas reservoirs has been accepted by most scholars, and a lot of researches have been carried out. Wojnarowski et al. [13] performed lots of liquid and gas permeability measurements on rock samples, contrasted the values of water and corrected-gas permeability, and found that water permeability was overestimated by Klinkenberg permeability, with difference in range of 11-24%. Tanikawa et al. [14] studied intrinsic permeability of sedimentary rocks using nitrogen gas and distilled water, found that gas permeability was greater than water permeability, increasing with an increase of pore pressure. Song et al. [15] investigated the influences ...

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Section: Tpg Calculation Methodsmentioning

confidence: 99%

Section: Mineral Compositionsmentioning

confidence: 99%

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Threshold Pore Pressure Gradients in Water-Bearing Tight Sandstone Gas Reservoirs

et al. 2019

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“…14,26 Based on the tectonic morphology and evolutionary history of the basin, it can be divided into six primary tectonic units: the Yimeng Uplift, the Yishan Slope, the Tianhuan Depression, the Weibei Slope, the Jinxi Flexural Belt, and the Western Margin Thrusting Belt. 27−31 Sulige gas field, located in the northwest of Yishan Slope, is a gentle west-dipping monocline 32,33 (Figure 1a). It is divided into four parts: the eastern district, western district, southern district, and central district during exploration and development.…”

Section: Geological Settingmentioning

confidence: 99%

Distribution and Main Controlling Factors of Gas and Water in Tight Sandstone Gas Fields: A Case Study of Sudong 41-33 Block in Sulige Gas Field, Ordos Basin, China

Xu,

Jia,

Huang

et al. 2024

ACS Omega

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Studying the gas−water distribution characteristics is essential in guiding the efficient development of gas fields. The relationship between gas and water in the Sudong 41-33 Block is complicated and has not been adequately researched. In recent years, gas wells have suffered from increased water/gas ratios and significant liquid loadings, which greatly affect the development of the block. A comprehensive analysis of formation water, log interpretation, and production data was conducted to determine the gas−water distribution characteristics and main controlling factors in the Sudong 41-33 Block. The findings indicate the following. (1) The formation water in the study area consists mainly of CaCl 2 brine with high total dissolved solids (TDS) (with an average value of 36.06 g/L). The hydrochemical characteristics indicate that the formation water is typical sedimentary buried water under well-sealing conditions, which is markedly different from shallow river water and seawater. (2) The formation water can be categorized into three types: edge−bottom water under the gas layer (Type I), stagnant water in tight sandstone (Type II), and isolated lenticular water (Type III). The water layer distribution in the plane is mainly concentrated in the northwest region, whereas it is dispersed in other regions. On the vertical, the water layer mainly appears in P 2 x 8−1 , P 2 x 8−2 , and P 1 s 2 Members. (3) The physical properties of the reservoir, hydrocarbon generation intensity (HGI), source rock−reservoir relationship, and mini-structure are the main factors affecting the gas−water distribution in the study area. Based on the clarification of the characteristics of gas and water distribution and its main controlling factors, it is of great importance to accurately identify the water layer, avoid the direct development of the water layer, adopt the proper production pressure differential, and carry out drainage gas production measures in time to ensure the effective development of the gas field.

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“…China has large amount of unconventional oil and gas resources represented by tight gas, shale oil and gas reservoirs. In recent years, with the continuously in-depth oil & gas exploration and development, the unconventional resources have become increasingly important in China's petroleum industry system (Tong et al, 2018;Zou et al, 2018;Li et al, 2019a;Ji et al, 2019;Jiao, 2019;Li et al, 2020). After the successful development of marine reef and shoal facies reservoirs in Yuanba area of northeastern Sichuan, the tight sandstone gas reservoirs of the upper triassic Xujiahe formation also showed a great potential of resource (Zhang et al, 2016;Long et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

The investigation of microporous structure and fluid distribution mechanism in tight sandstone gas reservoirs: A case study on the second member of Xujiahe gas reservoirs in Yuanba area

Guo

Fu²,

Li³

et al. 2022

Front. Energy Res.

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Tight sandstone reservoir is characterized by ultra-low porosity, complex microporous structure and water residues, which shows different gas storage and transport mechanism from conventional reservoirs. Therefore, effective development of tight sandstone gas reservoirs is faced with technical challenges. Microporous structures, distribution mechanism of fluid is a basic issue in gas reservoir evaluation. In this work, we take gas reservoir in the 2nd member of Xujiahe Formation in Yuanba area as an example to analyze the microscopic feature of pore structure and fluid distribution. The three-dimensional digital core has been applied to represent the real microporous structure. Specifically, a digital core reconstruction method based on SEM and casting slice images has been proposed. Ultimately, the mechanism of distribution, mode of occurrence of water residues in tight sandstone reservoirs has been simulated and quantitatively analyzed. The results show that the water residues could been visualized and categorized into three modes, water mass in corner, water film on surface, and water column in throat. The water residues could cause dramatic influence on pore structures, active pore size could be decreased with rising residual water saturation, the magnitude falls by over 50%. In addition, grain size would affect the distribution of water residues, which shows different percentage in medium and fine sand. Pore connectivity is another characteristic factor to describe the microporous structures. In this study, cluster marking algorithm has been applied to obtain the pore connectivity in tight sandstone with different grain size. In medium sand, the pore connectivity is dramatically decreased with rising water saturation, the downward trend become slower when water saturation reaches to 60%. Compared to fine sand, the tendency variation appears when water saturation reaches to 40%. This paper provides an applicable method to reveal the micro-scale reservoir properties and fluid distribution mechanisms in tight sandstone gas reservoirs.

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Technical strategies for effective development and gas recovery enhancement of a large tight gas field: A case study of Sulige gas field, Ordos Basin, NW China

Cited by 50 publications

References 6 publications

Threshold Pore Pressure Gradients in Water-Bearing Tight Sandstone Gas Reservoirs

Threshold Pore Pressure Gradients in Water-Bearing Tight Sandstone Gas Reservoirs

Distribution and Main Controlling Factors of Gas and Water in Tight Sandstone Gas Fields: A Case Study of Sudong 41-33 Block in Sulige Gas Field, Ordos Basin, China

The investigation of microporous structure and fluid distribution mechanism in tight sandstone gas reservoirs: A case study on the second member of Xujiahe gas reservoirs in Yuanba area

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