Study on One-Point Productivity Model of Horizontal Well in Dongsheng Tight Low Permeability Water Production Gas Reservoir
In order to further improve the accuracy of gas reservoir productivity prediction, a horizontal well produc-tivity model was studied for the Jin 30 well area of Dongsheng gas field. Based on the derivation process of the pro-ductivity equation for oil reservoirs horizontal wells proposed by Giger, Joshi, Borisov, and Chen Yuanqian and a productivity formula for gas reservoir horizontal wells was established following the law of seepage; Based on the fit-ting relationship between gas permeability and water content, the influence of water to gas ratio on the inflow per-formance curve of gas wells was analyzed. It was found that the dimentionless inflow dynamic curves under different water to gas ratios overlapped and were straight lines, but the unobstructed flow rate was greatly affected by the wa-ter to gas ratio; A new concept of dimensionless and unobstructed flow rate for water and gas wells was proposed, and a relationship between dimensionless and unobstructed flow rate and water to gas ratio was established. Based on this, the one-point productivity prediction model was derived.
Dongsheng gas fieldtight low permeability gas reservoirhorizontal wellinflow dynamicsone-point productivitywater to gas ratio
万方数据
维普
