Productivity Prediction And Product System Optimization Design Of Horizontal Gas-Condensate Well

Compared with vertical wells, horizontal wells has been developing in Gas-condensate reservoir as its low drawdown pressure,helping to maintain the formation pressure and controlling of anti-condensate. Therefore study on the productivity prediction model and product system of horizontal gas-condensate well is of important significance. On the basis of relevant research, condensate reservoir dew point pressure is matched using LHSS equation of state according to theroy of phase balance. Fluid component and flow pattern at different pressure are received through gas and liquid balance calculating at reservoir temperature. For the subject system of formation, flowing of oil-gas-condensate form boundary to horizontal well consists of three regions: a region containing single phase reservoir gas, a region of condensate buildup where only gas flowing and an inner near-well region where both gas and oil flow simultaneously. The boundary pressure for each resign is determined by saturation and flowing ability of condensate. A horizontal gas-condensate productivity model is built which takes into account phase balance,the relevant parameters for calculating are given in the model. And the inflow performance influencing factors are analyzed. Considering gas- condensate reservoir fluid phase change at different well-bore temperature and pressure, the horizontal well-bore, vertical well-bore as well as the gas flow of mouth have been researched and the pressure drop calculation model are set up. Taking whole product system as study object and using the method of dynamic nodal analysis. Theory and method of horizontal gas-condensate well's product system optimization design is determined. And calculating software is programed. The main effects of tube and choke size on product system of horizontal gas-condensate well are analyzed to determine horizontal gas-condensate well's reasonably develop gas-condensate reservoir.