Research On Optimizing Tubing Technology Of Dewatering Method In Fractured Gas Reservoir

It is well known that a water driving gas reservoir will happen to water producing in most of area along with it being exploited deeply.The output of gas well is affected badly and the ultimate gas reservoir recovery ratio will be declined greatly. So to increase the outputs of gas wells and gas fields,it is urgent to take projects of drainage gas recovery.Optimizing tubing technology is just applied in the gas wells that produce a little water and this technology can prolong the flowing and throughputing water time of gas wells.This paper described the discontinuous filtering flow phenomenon of gas and water phases in the fractured gas reservoirs, explained the reason why the gas wells in fractured reservoirs unsteady produce water and gas. It established the gas and water inflow performance relationship of vertical well in the fractured gas reservoirs. On the basis of predecessor's fruit, this paper researched the coherent calculating method of pressure and temperature distribution in the gas well. It transformed the charts of Hagedorn-Brown method to functions in order to programming the software. It described the reason and mechanism of engendering gas hydrate and established the statistic thermodynamic model which can predict the engendering pressure or temperature of gas hydrate.In order to calculating these, it researched the method of calculating the component fugacity. Through combining critical gas flow rate for gas wells unloading and nodal system analysis, it developed a method that can be used for optimizing the tubing and predicting the reservoir pressure of undewatering. Because water will be break to fluid drop of different diameter, the gas well can also remove part of water. On the basis of this principle, this paper established the model of gas well dynamic liquid loading process. It established the mechanical model which can be used for calculating the axial force, friction and contact force of coiled tubing according to wellbore track. On the basis of all the above, an optimizing tubing technology of dewatering method software has been accomplished.