Research On Drainage And Gas Production Technology Of Horizontal Wells In Western Sichuan

since 1994,chuanxi gas field enters the scale exploration and development, We discovered and proven in a number of small and medium gas fields which consists mainly of shallow gas reservoirs, It has become an important production base of natural gas to Sinopec.Gas reservoirs are mostly closed elastic water drive gas reservoir,After developing for some time,Gas well will appear in varying degrees liquid loading,Even producing the phenomenon of flooding and stoping production. But, Chuanxi gas Field exists universally the phenomenon of low pressure,low permeability and low yielding, Thus increasing well productivity and reservoir recovery which because a priority. Horizontal well technology can increase the contact area between the wellbore and gas reservoirs,improve the degree of use of tight gas reservoirs,horizontal wells has become the main development mode in the shallow gas reservoirs of chuanxi gas field. While horizontal wells can improve well production, but its fracturing size is larger than the vertical wells and make the amount of fluid into the ground, while brings about the bottom of well remains more the fracturing fluid, if can not discharge fluid,it will affect the fracturing effect, At the same time,as the extension of mining time,gas pressure and productivity decline, reducing horizontal well with liquid gas capacity, will produce fluid downhole to accelerate gas production and even shut down flooded, greatly reduce the gas reservoir recovery. Quickly and efficiently draining] and resuming production is key of maintaining gas production capacity and efficient developing gas fields.In this thesis, by analysising the law of produced water and liquid carrying western to horizontal wells in in shallow of chuanxi gas field, againsting yield and pressure diminish fast in the production process and the serious problems of downhole fluid to select a suitable drainage gas recovery technology and instances of computing. In this paper, by shallow horizontal wells in western Sichuan water characteristics and liquid carrying law analysis, as well as to carry out horizontal wells drainage gas recovery technology adaptability, shallow horizontal wells in western Sichuan for the production process yield pressure decreasing fast, the bottom product was a serious problem preferably suitable drainage gas technology and examples of calculations.