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Appl. Sci. 2017, 7(7), 697;

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

School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, Hebei, China
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
Author to whom correspondence should be addressed.
Received: 6 June 2017 / Revised: 27 June 2017 / Accepted: 29 June 2017 / Published: 7 July 2017
(This article belongs to the Special Issue Clean Energy and Fuel (Hydrogen) Storage)
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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. View Full-Text
Keywords: carbonate gas reservoirs; water invasion; recovery factor; aquifer size; production rate carbonate gas reservoirs; water invasion; recovery factor; aquifer size; production rate

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Fang, F.; Shen, W.; Gao, S.; Liu, H.; Wang, Q.; Li, Y. Experimental Study on the Physical Simulation of Water Invasion in Carbonate Gas Reservoirs. Appl. Sci. 2017, 7, 697.

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