Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (3): 121-126.doi: 10.3969/j.issn.1673-8926.2016.03.016

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Deduction and application of productivity formula for horizontal well with producing water in tightsandstone gas reservoir

Yuan Lin1， Wang Chaoming2， Li Xiaoping 3， Hu Xinjia 1， Zeng Li 1   

  1. 1. Northeastern Sichuan Gas Production Plant，Sinopec Southwest Oil and Gas Field Company，Langzhong 637402，Sichuan，China；2.No.10 Oil Production Plant，PetroChina Changqing OilfieldCompany，Qingyang 745600，Gansu，China；3.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu 610500，China
  • Online:2016-05-20 Published:2016-05-20

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Abstract:

Tight sandstone gas is unconventional natural gas resources with great potential at present, but because of the gas reservoir with low porosity and low permeability and the effect of gas well producing water, the seepage of the fluid in the gas reservoir will no longer meet the traditional Darcy ’ s law. Based on the Joshi ’ s theory on productivity of horizontal well, considering the effect of gas well producing water, stress sensitivity, slip effect and high-speed non-Darcy flow of gas on productivity, this paper defined the generalized pseudo pressure of gas-water two phase, and used the seepage theory of gas-water two phase to deduce a new binomial productivity formula of horizontal well with gas-water two phase in tight sandstone gas reservoir. Case study and correlation shows that the absolute open flow calculated by new formula has a small relative error with that calculated by gas well-testing, just 6.60%, which indicates that the new formula will beof highaccuracy. Sensitivity analysis shows that as the increasing of volume ratio between water and gas and stress sensitivity index, the absolute open flow of horizontal well will decrease, while as the increasing of slip factor,the absolute open flow will become increasing as well.

Key words: salt-resistant polymer, common polymer, hydrodynamic diameter, pore structure

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