The Study On Supplementary Technology For Da Zhangtuo Gas-condensate Reservoir Underground Ggs Store

The study on supplementary technology fOr DaZhangtuo gas -- condensate reservoir underground Gas storeABSTRACTAs an important compositional part of large -- scale gather -- delivery engineeringof natural gas f The underground Gas store play some unable substitute role fOr opti-mizing functions of gather -- de1ivery system and cutting down investment cost and ad-justing the difference between peak and valley to consuming -- gas market in winterand summer and ensuring demand of users. from the first underground Gas store wasbuilt in Canada in 1915 to the end of 1999, have built various underground Gas store,total amount to 542 sets, work gas volume have amounted to 2418 hundred millionscub meter in the Whole word.Along With the vigOrous develOPment of economic situation in Beijing and Tianjinareas, Building up the large -- scale underground Gas store is more necessary and im-perative. This paper investigated on supplementary technique of building up the largescale underground Gas store 0 the Gas store of Da Zhangtuo gas reservoir that adjust-ing 0 peak gas volume per day is over 5 millions as to satisfy the demand in Beijingand Tianjin areas l the main contents are included as fOllows.1. By usng the suPper technique of well Log binding -- inversbo and reservoirtransverse forecasting etc., and by means of the comprehensive study on a vastamount of information which are based upon Two -- Dimensional and Three -- Dimen-sional seism and well Log and drilling and indoor experiment etc., Make sure that thegas pool is a nose -- shape structure which is a litho -- fault composite trap that wasfOrmed from fault sealing and sandstone pinch -- out, and the fault and caprock aretensely sealed, the sandstone connection is very perfect.2. By analyzing the dynamic recovery information and indoor experiment data fOrthe fluids, summarized the hydrocarbon characteristics of high -- saturation and high -content of oil and high inverse ?condensation, analyzed the possibility of exiting oil ring, determined the abandonment pressure of the gas pool is lOMpa.3.By using volume method and mass ?equilibrium and pressure falloff test method, comprehensively calculated and evaluated, and determined the Da Zhangtuo condensate reservoir reserves is about 15. 5 X 108m3.4.By utilizing these special technology such as mass ?equilibrium and numerical simulation etc., performed optimizing research and design for gas pool characteristic parameters such as the volume capacity of gas pool and work gas volume etc.5.By using the analysis method of nodal point, conducted optimizing design for the injection ?production capability of injecting ?gas wells and producing ?gas wells.6.According to the quota demand of 50 millions every day, designed the seasonal adjusting ?peak of gas pool, the periods of producing ?gas and injecting ?gas respectively are 120 days and 220 days, product first and inject afterwards. the pressure of gas pool is keep with 15 to 29 MPa, the gas pool is running under the quota of 3. 5 millions every day for single production gas well and 4 millions every day for single in~j eetion gas well.7.By using numerical simulation method, designed the practicing project of eight injecting ?ga~ wells and sixteen producing ?gas Wells, and injecting ?gas wells must be allocated in the medium 0 and heavy height location of the geological structure.8.Depending on the characteristics of the underground Gas store, worked out thecontents of monitoring the reservoir for construction and operation of gas store at every stage.9.Designed the project geologically for 12 injection ?production wells. DaZhangTuo underground Gas store reached the high ?grade levels that the success possibility of drilling is 100 percent. And the accordance ratio of the capability of injection ?production of single well and operation indexes of gas store all are 100 percent. This project is first one designed for large ?scale underground Gas store.