Geological characteristics and development strategies for Cambrian Longwangmiao Formation gas reservoir in Anyue gas field, Sichuan Basin, SW China

Li, Xizhe; Guo, Zhenhua; Wan, Yong; Liu, Xiaohua; Man-lang, Zhang; Xie, W.; Su, Yunhe; Hu, Yong; Feng, Jie; Yang, Baofeng; Ma, Sai; Gao, Shusheng

doi:10.1016/s1876-3804(17)30049-6

Cited by 46 publications

(17 citation statements)

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“…The edge and bottom water invades the well bottom with the increasing of water invasion, whereas with a steep increase in the wellbore liquid level and increase of abandonment pressure, a large amount of gas in the reservoirs will be trapped, which results in the lower recovery factor of gas reservoirs. According to previous studies, the recovery factor of water-driven gas reservoirs (20-60%) is significantly lower than that of dry gas reservoirs (80-95%) (Li et al 2010(Li et al , 2017bCheng et al 2017). Moreover, the operations such as draining are required when the gas-phase superficial velocity in the wellbore is too low to provide sufficient energy to remove accumulated liquid from the well bottom, which increases the production costs.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on water invasion mechanism of fractured carbonate gas reservoirs in Longwangmiao Formation, Moxi block, Sichuan Basin

Fang

Shen

et al. 2019

Environ Earth Sci

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Fractured carbonate gas reservoirs feature high heterogeneity and difficulty in development, and the invasion of edge and bottom water intensifies the complexity of exploitation of such gas reservoirs. In this study, reservoir cores with a permeability of 0.001 mD, 0.1 mD, and 10 mD were selected by analyzing the fracture characteristics of the Longwangmiao gas reservoir, and water invasion in fractured carbonate gas reservoirs with edge and bottom water was simulated using an experimental system to investigate the effects of different parameters on gas reservoir exploitation. The results show that the larger the water volume ratio, the more serious the water invasion and the lower the recovery factor. But water aquifer did not strongly affect the recovery factor once the water aquifer exceeded a critical value. The higher the gas production rate, the faster the water invasion and the smaller the recovery factor. The recovery factor peaked when the gas production rate was equivalent to the gas supply capacity of the matrix to the fractures. For gas reservoirs with the overall permeability, the higher the matrix permeability, the higher the recovery factor. Although an appropriate fracturing scale was able to enhance the recovery factor when its matrix permeability was low, an excessive fracturing scale would cause water to flow along the fractures at a rapid rate, which further caused a sharp decline in the recovery factor. With the increase of matrix permeability, fractures exerted a decreasing effect on gas reservoirs. These results can provide insights into a better understanding of water invasion and the effects of reservoir properties so as to optimize gas production in fractured carbonate gas reservoirs.

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Section: Introductionmentioning

confidence: 99%

Experimental study on water invasion mechanism of fractured carbonate gas reservoirs in Longwangmiao Formation, Moxi block, Sichuan Basin

Fang

Shen

et al. 2019

Environ Earth Sci

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“…Therefore, the analysis of the characteristics on the rock microstructure will lay a critical foundation for the study of the micro seepage mechanism of oil and gas. [1][2][3][4] With the rapid development of CT imaging technology, the important information which contains the characteristics of the core microstructure can be reflected by the core CT images, CT image has become an important material to analyze the core microstructure. 5,6 However, the rock skeleton and the pore space in the CT image can be hard to be clearly distinguished due to the existence of imaging noises and the limitation of instrument precision.…”

Section: Introductionmentioning

confidence: 99%

A New Improved Threshold Segmentation Method for Scanning Images of Reservoir Rocks Considering Pore Fractal Characteristics

Lin

Yang

et al. 2018

Fractals

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Based on the basic principle of the porosity method in image segmentation, considering the relationship between the porosity of the rocks and the fractal characteristics of the pore structures, a new improved image segmentation method was proposed, which uses the calculated porosity of the core images as a constraint to obtain the best threshold. The results of comparative analysis show that the porosity method can best segment images theoretically, but the actual segmentation effect is deviated from the real situation. Due to the existence of heterogeneity and isolated pores of cores, the porosity method that takes the experimental porosity of the whole core as the criterion cannot achieve the desired segmentation effect. On the contrary, the new improved method overcomes the shortcomings of the porosity method, and makes a more reasonable binary segmentation for the core grayscale images, which segments images based on the actual porosity of each image by calculated. Moreover, the image segmentation method based on the calculated porosity rather than the measured porosity also greatly saves manpower and material resources, especially for tight rocks.

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“…Experimental core samples were obtained from carbonate gas reservoirs of Anyue gas field, which is located in Sichuan Province, China [25,26]. The reservoirs are characterized by strong heterogeneity, including dissolved vugs, pores and fractures, which are shown in Figure 2a,b, respectively.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…In carbonate gas reservoirs, the pore structure of carbonate rock is more heterogeneous, including dissolved vugs, pores and fractures [26]. The existence of fractures has a strong influence on water and gas flow in gas reservoirs [14].…”

Section: Effect Of Different Fracturesmentioning

confidence: 99%

Experimental Study on the Physical Simulation of Water Invasion in Carbonate Gas Reservoirs

et al. 2017

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Water invasion in carbonate gas reservoirs often results in excessive water production, which limits the economic life of gas wells. This is influenced by reservoir properties and production parameters, such as aquifer, fracture, permeability and production rate. In this study, seven full diameter core samples with dissolved pores and fractures were designed and an experimental system of water invasion in gas reservoirs with edge and bottom aquifers was established to simulate the process of water invasion. Then the effects of the related reservoir properties and production parameters were investigated. The results show that the edge and bottom aquifers supply the energy for gas reservoirs with dissolved pores, which delays the decline of bottom-hole pressure. The high water aquifer defers the decline of water invasion in the early stage while the big gas production rate accelerates water influx in gas reservoirs. The existence of fractures increases the discharge area of gas reservoirs and the small water influx can result in a substantial decline in recovery factor. With the increase of permeability, gas production rate has less influence on recovery factor. These results can provide insights into a better understanding of water invasion and the effects of reservoir properties and production parameters so as to optimize the production in carbonate gas reservoirs.

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Geological characteristics and development strategies for Cambrian Longwangmiao Formation gas reservoir in Anyue gas field, Sichuan Basin, SW China

Cited by 46 publications

References 1 publication

Experimental study on water invasion mechanism of fractured carbonate gas reservoirs in Longwangmiao Formation, Moxi block, Sichuan Basin

Experimental study on water invasion mechanism of fractured carbonate gas reservoirs in Longwangmiao Formation, Moxi block, Sichuan Basin

A New Improved Threshold Segmentation Method for Scanning Images of Reservoir Rocks Considering Pore Fractal Characteristics

Experimental Study on the Physical Simulation of Water Invasion in Carbonate Gas Reservoirs

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