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Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.277 SNIP: 0.52 CiteScore™: 1.3

ISSN Imprimir: 2151-4798
ISSN En Línea: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/SpecialTopicsRevPorousMedia.2019029810
pages 475-484

A NEW MODEL PREDICTING WATER BREAKTHROUGH TIME IN BOTTOM-WATER DRIVE GAS RESERVOIR BASED ON CAPILLARY PRESSURE AND BUCKLEY-LEVERETT EQUATION

Wende Yan
Chongqing Key Laboratory of Complex Oil & Gas Fields Exploration and Development, Chongqing University of Science & Technology, Shapingba, Chongqing, China
Yingzhong Yuan
Chongqing Key Laboratory of Complex Oil & Gas Fields Exploration and Development, Chongqing University of Science & Technology, Shapingba, Chongqing, China
Jun Liu
PetroChina Southwest Oil and Gas Field Company, Chengdu, China
Zhilin Qi
Department of Petroleum Engineering, Chongqing Key Laboratory of Complex Oil & Gas Fields Exploration and Development, Chongqing University of Science & Technology, Chongqing, P.R. China, 401331
Jiqiang Li
Chongqing Key Laboratory of Complex Oil & Gas Fields Exploration and Development, Chongqing University of Science & Technology, Chongqing, P.R. China, 401331
Qianhua Xiao
Department of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

SINOPSIS

To develop a bottom-water drive gas reservoir, it is very important to predict bottom-water advancement, calculate water breakthrough time, and provide mitigation for early water invasion. Existing methods often deal with activities after a certain amount of water invasion or water breakthrough in a gas well, and it is difficult to accurately predict the water breakthrough time. In this paper, we calculated the water saturation front in a bottom-water-invaded region using the Buckley-Leverett (BL) equation, in which multiple factors were considered such as the gas-water velocity difference in the water-invaded region, non-piston advancement of bottom water, seepage pattern changes in both perforated and non-perforated intervals, as well as gas and water flow rates in the bottom-water-invaded region based on the capillary pressure. Integration of a capillary pressure model, the BL equation, and a coning model of the bottom-water gas reservoir yielded a new method for calculating the water breakthrough time in a bottom-water gas reservoir and its corresponding analytical equation. The results from the analytical and numerical simulation methods were close to the actual water breakthrough time of a bottom-water gas reservoir. Our model provides a theoretical basis for predicting the water breakthrough time of a bottom-water gas reservoir.

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