The Research Of Commingled Production Feasibility In P₂ch² And T₁f³ Formation,Jiannan Gas Field

Jiannan gas field,which is located in eastern Sichuan fold belt in the middle of the syncline of the Sichuan Basin,the structure is north to east extension,the western part is Doosan anticline,and the eastern part is Qi Yue Shan anticline.In this paper,we focus on the following problems: the low degree of recovery,the slow gas production rate,and the high cost of well construction and gas production in Changer and Feishan gas reservoir of Jiannan gas field over the years,and we study the feasibility of commingling mining in in Changer and Feishan gas reservoir of Jiannan gas field.The multi-layer commingling mining gas wells are optimized,and the working system of multi-layer commingling mining well is optimized,which provide the technical support for speeding up the gas production rate and reducing the cost of gas production in Jiannan gas field.Mainly according to the comparison of existing data,gas reservoir engineering research,gas well numerical simulation research and analogy analysis etc.,we complete the following research contents in this paper:(1)Collecting the static dynamic data of Changer and Feishan gas reservoir,and contrasting the structural characteristics,reservoir characteristics,fluid properties,current formation pressure of Changer and Feishan gas reservoir,which are laying the foundation of commingling mining research in Changer and Feishan gas reservoir of Jiannan gas field.(2)The evaluation of commingling mining technical limits in Changer and Feishan gas reservoir.According to evaluating the interlayer interference of commingling mining in Changer and Feishan gas reservoir,and under the condition of reservoir physical and seepage characteristics diversity,the comparison of the effect of multi-layer commingling mining and slice mining determines a quantitative range of parameter that is suitable for gas commingling mining.(4)The suitable commingling mining gas well in Changer and Feishan gas reservoir is optimized through commingling mining technical limits research combined with actual production data in field in Changer and Feishan gas reservoir.(5)On the basis of the optimized commingling mining gas well,the commingling mining model is established to determine the reasonable production allocation of selected gas wells.