The Study Of Development Plan Of CO₂ Gas Reservoir In The First Member Yingcheng Formation In Fangshen 9th Block

The first member of Yingcheng formation is main reservoir of Fangshen 9th block layer.Lithology is usually with argillaceous siltstone,mottled glutenite clip volcanic rock.Reservoir is volcanic.This block is lack of the second and third period of formation.The volcanic clastic rock in the forth stage of Yingcheng formation can be used as a local cap rocks in this area.According to the gas steady flow energy equation.We considered deviation coefficient and the fluid temperature as a variable.Considering the influences of kinetic energy change is established calculation model of temperature distribution in wellbore pressure.Using visual basic and VisualFortran we established carbon dioxide wellbore temperature and pressure distribution calculation program,with the basis for the flow calculation to theoretical dynamic curve.Theoretical model was used to calculate dynamic pressure gas well and dynamic temperature.Bottom hole pressure and temperature are calculated through wellhead pressure and temperature.In this paper,the established calculation model has higher precision.More importantly,when gas well depth is over 3000 m,compared with the average temperature and average deviation coefficient calculation method,the calculation precision of the calculation model is reliability and outstanding.It indicates that the calculation model for deep wellbore pressure distribution of CO₂ gas well and the calculation of wellbore temperature distribution is completely feasible.It can reflect the flow law of gas well and dynamic.According to the information in 3 Wells,analysising CO₂ gas reservoir development engineering,we determine the gas well capacity and the law of diminishing,reasonable production proration,gas recovery rate and stable life.We analysised the water energy and distribution,in order to achieve the overall water conservancy,provide accurate basis for next production process modification,optimization of efficient development of gas reservoir.Although the reservoir prediction method and the technology is feasible.But as a result of volcanic rock reservoir heterogeneity and fast lateral change.For the spatial distribution of reservoir,especially the change of physical properties should be studied further in the process of development and evaluation.According to the result of development and control of well drilling deepening understanding,we will study the changing rule of the exploration of volcanic rock reservoirs in the area.