Study On Geological Characteristics And Stable Production Techniques Of Yan 9 Reservoir In Shaanxi 92 Area Of ??Jingan Oilfield, Ordos Basin

Located in the middle of northern shaanxi slope of the ordos basin,Launched in December 1993,Only Shan 92 Wells have experienced in the pre-exploration stage:In 1993,drilled in Shan 92 well,which showed a poor oil and gas display,with a delay of Y9 and cumulative oil recovery about 2.65×104t.Evaluation stage:In 2005-2009,the water flooding well in the reservoir of the Jurassic reservoir was carried out in the Pgl C6 reservoirs,which the initial single well was 3.85t/d,and the cumulative oil recovery was 5.35×104t,Scale construction stage:From 2010 to 2012,the sustainable scale of production,crude oil nissan breakthrough 400t/d.At present,there are 126 oil wells and 49 water injection wells in the area,Nissan oil level for 397t/d,single well nissan 3.15t/d,comprehensive water content 60.6%,single water injection well inject as 31.1m3/d,The area has experienced years of development,water flooding prime mover has decreased,the water content has increased gradually,the oil field has been decreasing,and the control of water stabilization has become the core of the future production,This paper takes the core observation as the entry point,carries on the small layer division contrast,the reservoir geological characteristic understanding,With reservoir engineering analysis method,the influence of reservoir characteristics on reservoir development was analyzed,the development law of reservoir was summarized,and the technical policy of reservoir development was evaluated.In view of the contradictions existing in the development process,a more reasonable development technical policy is developed.The main achievements of this thesis are as follows:1?In combination with the sedimentary cycle and the core and well logging curve,the subdivision of the Shan92 Y9 oil reservoir was divided into three small layers:Y91,Y92and Y93.2?The main reservoir of Y9 reservoir is the reticulated river.The microfacies of sedimentary microfacies mainly have the microfacies of natural dikes,microfacies and flood plain.3?The pore type of sandstone reservoir in Shan 92 area is the feldspar solution hole,intergranular pore,intergranular pore and cutting-cutting-hole.4?There is the strongest non-homogeneity in the Y92 reservoir,There are class ? and class ? classes in the general level of Y91 reservoir.In general,the reservoir of Y92 and Y93 is mainly class ? and class ?.5?The reasonable pressure maintenance level is 8.21 MPa at present,and the reasonable recovery intensity is 0.75-0.8m3/m.d.The reasonable injection ratio is about 1.25,and the reasonable water injection is 32.6m3/d.