Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (6): 148-153.doi: 10.3969/j.issn.1673-8926.2017.06.019

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Pseudo-steady state deliverability for gas wells in thick gas reservoirs

HUANG Quanhua1, TONG Kai1, CHEN Chong2, LU Yun1, FU Yunhui1   

  1. 1. College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China;
    2. No.2 Oil Production Plant, Sinopec Henan Oilfield Company, Nanyang 473000, Henan, China
  • Received:2017-08-11 Revised:2017-10-12 Online:2017-11-21 Published:2017-11-21

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Abstract: The deliverability evaluation is one of the main contents of natural gas engineering,which is crucial to the reasonable and efficient development of the gas reservoirs. The plane radial flow deliverability equation and semi-spherical flow deliverability equation are commonly used to evaluate the deliverability of gas wells. For the gas reservoirs with great thickness and high deliverability,the two methods are not so applicable. To derive a new method to evaluate the deliverability of gas well in thick reservoir,the model was improved,in which the layer was made up of perforated interval and unperforated interval. According to the percolation mechanics,pseudo-steady state deliverability equation of gas wells in semi-spherical flow model was deduced. Then the pseudosteady state deliverability equations of the two intervals and the whole gas layer were derived. A calculation example of a producing gas well in thick reservoirs was performed. The results show that the factors of perforating degree, skin effect and effect of non-Darcy flow can't be ignored and the pseudo-steady state deliverability equation based on the improved model is more accordant with the actual production. This study could provide a practicable method for the productivity evaluation for gas wells in thick gas reservoirs.

Key words: Sonic Scanner, fracture effectiveness, dispersion, anisotropy, fast and slow shear wave, Sinian, Sichuan Basin

CLC Number: 

  • TE37
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