| WuLingshan Carboniferous gas reservoir in May 12,1995 in the Seven Mile 25 well put into operation,the initial production 40.0×104m3/d,in 1997 the preparation of the development plan.According to the January 1998 gas reservoir development plan put into development,with production of 35.0×104m3/d,continuous and stable flowing production.In September 21,1998 25,seven wells in the beginning of the production of water,the gradual pressure of small output to 35.0×104m3/d,25.0×104m3/d,20.0×104m3/d,15.0×104m3/d,drainage gas recovery.During the period due to water without a way out or water flooded many times.In 2007 began to carry out the pressure mining,to achieve continuous normal production.In 2007 production November 13,seven in 025-X1 well is breath water producing wells,due to a large amount of water production,not flowing production,at present as Wulingshan Carboniferous gas reservoir drainage wells,gas lift drainage and batch production.Based on a large number of domestic and foreign literature research,combined with the development of WuLingshan,dynamic information,etc.By carrying out the dynamic characteristics of gas reservoir production,water activity,water intrusion intensity evaluation and numerical simulation of gas reservoir,The development potential of gas reservoir has been further recognized,and the adaptability of the drainage gas recovery process in this area has been evaluated,A new method of drainage gas recovery is put forward in order to achieve the scientific and efficient development and utilization of the gas reservoir,and realize the stable production and sustainable development of natural gas,and provide reference for the development of similar gas reservoirs.This paper mainly completes the work and the main conclusions obtained:(1)The dynamic characteristics and water invasion of five Lingshan gas reservoir were studied;It is considered that the gas reservoir is connected with the whole gas reservoir,and the water recovery is short,and the output of the gas wells is decreased rapidly,and the water consumption is higher than that of the water,Active water,shut measures cannot control water invasion,gas well after shut production difficulties.(2)Numerical simulation of gas reservoir is carried out.According to previous geological modeling data,the static and dynamic data of the block are carried out by numerical modeling of gas reservoir,and the production history fitting is finished;Deadline to December 2014 emboldened the Tibetan year cumulative gas production 8.43×108m3 and the degree of recovery 36.20%,residual volumetric method reserves 14.86 billion m3,gas reservoir remaining reserves are larger.(3)The analysis of the five wells in seven wells and seven wells in the well and the 25 mile 025-X1 well,and to optimize the implementation of the Seven Mile 25 to carry out the measures,Fish,to avoid the pressure of the production layer,under the pressure of the gas lift valve to the top of the production line,through the flow of the flow pattern fitting,adaptability evaluation,oil pipe friction and loss analysis,It is recommended that the size of the oil pipe is chosen to be 88.9mm,which is more advantageous to the drainage,and in the same injection volume and drainage condition,it is more advantageous to reduce friction and slippage loss.Carry out the seven 025-X1 wells production design. |
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