A novel steadystate productivity equation for horizontal wells in bottom water drive gas reservoirs
 Liehui Zhang,
 Yulong Zhao,
 Zhibin Liu
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It is known that there is a discrepancy between field data and the results predicted from the previous equations derived by simplifying threedimensional (3D) flow into twodimensions (2D). This paper presents a new steadystate productivity equation for horizontal wells in bottom water drive gas reservoirs. Firstly, the fundamental solution to the 3D steadystate Laplace equation is derived with the philosophy of source and the Green function for a horizontal well located at the center of the laterally infinite gas reservoir. Then, using the fundamental solution and the Simpson integral formula, the average pseudopressure equation and the steadystate productivity equation are achieved for the horizontal section. Two casestudies are given in the paper, the results calculated from the newlyderived formula are very close to the numerical simulation performed with the Canadian software CMG and the real production data, indicating that the new formula can be used to predict the steadystate productivity of such horizontal gas wells.
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 Title
 A novel steadystate productivity equation for horizontal wells in bottom water drive gas reservoirs
 Journal

Petroleum Science
Volume 8, Issue 1 , pp 6369
 Cover Date
 20110301
 DOI
 10.1007/s1218201101162
 Print ISSN
 16725107
 Online ISSN
 19958226
 Publisher
 China University of Petroleum (Beijing)
 Additional Links
 Topics
 Keywords

 Horizontal well
 pointsource function
 bottom water driver gas reservoir
 steadystate productivity
 Industry Sectors
 Authors

 Liehui Zhang ^{(1)}
 Yulong Zhao ^{(1)}
 Zhibin Liu ^{(2)}
 Author Affiliations

 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
 2. School of Science, Southwest Petroleum University, Chengdu, Sichuan, 610500, China