Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (4): 154-161.doi: 10.3969/j.issn.1673-8926.2017.04.019

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Productivity calculation method for gas-water two phase fractured horizontal wells in tight gas reservoir

HE Jixiang1, JIANG Ruizhong1, MAO Yu2, YUAN Lin3   

  1. 1. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China;
    2. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    3. Northeastern Sichuan Gas Production Plant, Sinopec Southwest Oil and Gas Company, Langzhong 637402, Sichuan, China
  • Received:2017-01-23 Revised:2017-03-15 Online:2017-07-21 Published:2017-07-21

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Abstract: Tight gas is a potential of unconventional natural gas resources,while duo to the low porosity, low permeability, producing water and production adjusting, unsteady flow model and conventional Darcy law are no longer applicable to predict the production of gas wells. Based on the percolation mechanism of fractured horizontal wells in tight gas reservoir, considered the effects of stress sensitivity in reservoir and fractures, gas slippage and non-Darcy percolation caused by high velocity in fractures on productivity, the gas-water two phase generalized pseudo pressure in reservoir and fractures was defined respectively, and the gas-water two phase productivity calculation model for tight gas reservoir was built. Case study shows that the relative error of absolute open flow calculated by the new model is small compared with that calculated by productivity testing, which proves high accuracy and reliability of the new model. With the increase of fracture number, half-length and conductivity, the absolute open flow of gas well increases, while with the increase of water-gas volume ratio and stress sensitivity index in reservoir and fractures, the absolute open flow of gas well decreases, meanwhile gas slippage has little influence on gas well productivity,which can be neglected. The method could provide a theoretical basis for studying inflow performance relationship(IPR)of fractured horizontal wells and optimizing the fracture parameters in tight gas reservoir.

Key words: hydrocarbon source rock, oil source correlation, Yanchang Formation, Xunyi exploration area, Ordos Basin

CLC Number: 

  • TE34
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