| The development effectiveness evaluation of gas reservoir is an important approach to improve the level of gas field management,discover the existing problems in the development process,and realize the efficient and reasonable development of gas reservoirs.It is an extremely effective method for improving gas reservoir recovery.Currently,the effective driving energy of Block A Gas Reservoir of Carboniferous in eastern Sichuan Province tends to be depleted.Even turbo-charged mining applied in 2010,the production still continued to decline,which means liquid loading has gradually influenced production.Therefore,this paper uses gas reservoir dynamic analysis and numerical simulation to study systematically the structure,reservoir,reserves and percolation characteristics,and puts forward some suggestions for further development.The main conclusions are as follows:(1)Suimmarizing the main problems currently faced in Block A Gas Reservoir of Carboniferous:the production of wells water gas ratio increased gradually,leading some wells have difficulty with unloading liqiud;some gas wells have unproper production allocation seriously,which promote the water invasion zone reserves difficult,production scale has not reached the scale adjustment plan.(2)Gas reservoir dynamic reserves calculation and numerical simulation confirmes that SPC Gas Reservoir and PJP High Spot have the dynamic reserves with 243.62×108m3 and the residual dynamic reserves with 55.60×108m3.The calculated dynamic reserves and residual dynamic storage quantity by water flooding material balance method of Well 001-1 in XM High Hoint are respectively 3.49×108m3 and 1.68×108m3.(3)The numerical simulation shows that:The Fault S31 and S32 are unconnected completely,which can effectively block edge water invasion;Fault S33 isn't broken completely in the line along the east wing between Well TD 90 and Well TD 88 well,which provides a channel.The residual gas reserve is mainly distributed between Well TD 86-26 area and Well TD 30,030-1 area.(4)Gas reservoir pressure drop profile analysis shows that:the pressure of Well TD 90(32.23MPa)is high,the pressure between Well TD 31 andWell TD 92 is the lowest,it's about 7.5MPa.Therefore,there is high risk for water invision.(5)Gas pressure recovery curve interpretation characteristics analysis shows that:skin factors of every well is less than zero,which means those wells are unpolluted;the middle area has better permeability,the south area has the worst permeability;the bilogarithmic of Well TD 30,Well TD88 and Well 96 is upwarp in the late days,we can conclude that those 3 wells may be peripheral edge water advancing.(6)Gas reservoir connectivity evaluation showed that the SPC and PJP for the same pressure system,each well is generally connected with SPC main body is not high;Xinmin connectivity,TD94 wells and SPC high connectivity,newly drilled wells TD090-1 and TD90 wells water connected East 001-H2 wells and East 001-1 inter well connectivity.(7)The analysis of the effect of gas reservoir development shows that:the distribution of well pattern in the main area of the gas reservoir is reasonable,and the calculation of the flow resistance of each well in the gas reservoir is about 375.93×104m3/d,and the reasonable allocation of gas reservoir is about 125.6×104m3/d.(8)Putting forward the measures of development in Block A Gas Reservoir of Carboniferous:adjusting the allocation of each well,reducing the rate of decline;Well TD84,Well TD29,Well TD82 and Well TD91 are recommended to change small tubing,the production type of Well TD030-1 are recommended to change to production in tube,Well East 001-H2 and Well TD81 are recommended to implement gas lift drainage technology;improving the drainage scale of Well TD90 to 300m3/d and closely monitoring the formation water activity.The research achievement of the paper is gradually implemented,which has achieved good performance and provides an important theoretical basis for the efficient development of this reservoir and improve the ultimate recovery.Further more,the research has significance of reference to the development of similar gas reservoir. |
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