Study On Performance Analysis And Productivity Evaluation Technique In Tight Sandstone Gas Reservoir

The natural resources of tight sandstone gas reservoir is rich in our country, it has wide distribution in Ordos Basin, western Sichuan,Daqing deep zone, Tarim deep zone, Bohai Bay area and Qaidam Basin. According to the 3rd National Resource Evaluation Results, There are 0.3 × l012 m3 conventional oil and gas potential resources in our country, and the amounts of recoverable resources are 12.1×l012 m3, it accounted for over 40% of the total number. In recent years, technology innovation, China National Petroleum Corporation has made great breakthroughs in the development of natural gas, and the annual growth rate is over 15%.Ordos basin is a large sedimentary basin which has the feature of weak structural deformation, multi-cycle superimposed basin and more sedimentary types, the acreage is approximately 25×104km2. Since the early Paleozoic, the Ordos basin had uplifted by the Caledonian movement which lead most of the area missing Ordovician, Silurian, Devonian and Lower Carboniferous, the basin began to settle until the beginning of the Late Carboniferous. Qilian sea invaded from the west, Huabei sea invaded from the east by the influence of the central paleo-uplift. Sea water intrusion increasing expanded, the seas link together by crossing the central paleo-uplift, forming a short-lived marine deposits. Then the sea exited the basin, and formed lakes and river-dominated deltas. The basin has rich natural resources, there are two gas reservoirs in the basin, the upper Paleozoic gas reservoir and lower Paleozoic gas reservoir.Sulige gas field is a fluvial sedimentary system under alluvial background, the feature of the reservoir is deeply buried, poor physical property, strong heterogeneity, poor continuity. It made the small controlled reserve, low production, fast pressure decrease and poor Stable production ability of the well, It increases the risk of developing. Su-53 block is located in the north-west Sulige gas field, the regional structure belongs to the middle of North-piedmont of Yishan slope, for the purpose of improving development efficiency in the Su-53 block development process, Great Wall company had carried out key science and technology program, transformed the mode of the transform, and achieved good results by the use of horizontal well overall development.The thesis grope gas production characteristics by classified management of gas. Then use gas reservoir engineering method to evaluate the production capacity and analyze dynamic production data from the aspect of well spacing adaptability, single well reasonable productivity, dynamic reserve of the well, influencing factors of horizontal well productivity.Provide a scientific basis for the Su-53 blocks to achieve sustained and stable objectives.