Research On Adjustment Of Development Plan In Gas Pool Of Fixianguan Formation,tie Shan Gas Field

Tieshan gas field is divided into two regions,south and north,Feixianguan formation is the main production layer of the gas field.After years of development,there arises four obvious problems.There are large differences between the static and dynamic reserves,so there still has greater potential for development and adjustment in the southern and northern Tieshan.Northern Tieshan has already produced water,but the characteristics of the water and the influence the water may cause are still uncertain.The distribution of residual reserves is still unclear.And in the late stage of gas field development,the pressure of the formation is low.Therefore,to develop the gas reservoir reasonably and efficiently so as to rise the gas reservoir recovery,it is necessary to study the adjustment of the exploitation plan of this gas reservoir.This paper is based on the static and dynamic data of Feixianguan formation in the Tieshan gas field,adopting gas reservoir engineering method combined with numerical simulation method for studying.Conducting the research on geological characteristics of gas field,dynamic evaluation of gas exploitation,numerical simulation and distribution of residual gas reserves.They provide reliable basis for designing adjusting plan of reservoir exploitation.Firstly,the dynamic characteristics of gas reservoir development are studied on the basis of seepage flow mechanics.Establishing an evaluation model of gas reservoir deliverability,analyzing the law of declining gas reservoir,verifing the dynamic reserves of gas field and recognizing water invasion characteristics of gas reservoir to evaluate the development effect of gas reservoir.Secondly,the distribution characteristics of residual reserves in gas reservoirs are studied by establishing a numerical simulation model.Finding out the pressure distribution characteristics of gas reservoir and quantifying the residual gas to ascertain potential of exploration and development.Then,designing adjusting plan of reservoir exploitation to optimize the best predictor.The innovation points and main achievements obtained through research are as follows:1.The geological reserves of Southern Tieshan are identified as 60.09(10~8m~3),The geological reserves of Northern Tieshan are identified as 46.70(10~8m~3).Among them,the total dynamic reserve of Southern Tieshan is 54.13(10~8m~3),the total dynamic reserve of Northern Tieshan is 34.98(10~8m~3).2.The water yield situation in Northern Tieshan is recognized as sealed formation water,but no obvious water invasion occurred.3.The distribution law of residual reserves of gas reservoirs was determined.in Feixianguan Formation,Tieshan Field.It is mainly distributed in the TS1 and TS6 well-block,Northern Tieshan.The remaining reserves is 38.19(10~8m~3).4.Formulating scientific plan for gas reservoir exploitation to expect the recovery percentage of Southern Tieshan is up by 1%,the recovery percentage of Northern Tieshan is up by 13.68%15 years later.The development effect of gas reservoir has been improved.