LITHOLOGIC RESERVOIRS ›› 2016, Vol. 28 ›› Issue (4): 88-94.doi: 10.3969/j.issn.1673-8926.2016.04.012

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Productivity calculation method of fractured horizontal wells with gas-water two-phase in low permeability gas reservoirs

Yuan Lin 1，Li Xiaoping 2，Liu Jianjun 3   

  1. （1. Northeastern Sichuan Gas Production Plant，Sinopec Southwest Oil and Gas Field Company，Langzhong 637402，Sichuan，China；2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu 610500，China；3. No.1 Gas Production Plant，PetroChina Changqing Oilfield Company，Yulin 718500，Shaanxi，China）
  • Online:2016-07-20 Published:2016-07-20

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Abstract:

Developing low permeability gas reservoirs with horizontal well technology supported by hydraulic fracturing has become the trend globally, while gas well with water restricted the productivity seriously. Based on the filtration theory of gas-water two?phase in the reservoir and hydraulic fracture, considering stress sensitivity and slippage effect in reservoirs, as well as high velocity non - Darcy flow in the hydraulic fracture, this paper defined the generalized pseudo pressure of gas-water two-phase, and used the theory of potential superimposition to establish a new productivity model of fractured horizontal wells with gas-water two-phase in low permeability gas reservoirs. Case study shows that theoretical inflow performance relationship（IPR）curve is in a good coincidence with the actual test data; moreover,the relative error of absolute open flow calculated by the new model is small compared with that calculated productivity test, just 5.4%, which indicates the high accuracy of the new model. Sensitivity analysis result demonstrates that as the increasing of the number, half length and conductivity of fracture, the absolute open flow increases, but the increasing trend becomes more and more gentle, while as the increasing of water-gas volume ratio, the absolute open flow decreases obviously. This study is helpful for productivity prediction and fracture optimization design of fractured horizontal wells with gas-water two?phase in low permeability gas reservoirs.

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