Study On The Development Geological Characteristics Of Xinggu 7 Buried Hill Reservoir And The Experiment Of Injecting Non-hydrocarbon Gases

Xinggu 7,with a structural area of 6km2,is located in bohai bay basin and is located in the western depression of liaohe depression.Xinglong station high buried hill south,west,north to sub-sag down big fault,up to the overlying the Mesozoic,three the archean erathem buried hills from the sand,the sand four thick dark mudstone contact,eventually form xinglong station high buried hill oil supply "window".This paper studies the microreservoir characteristics of xinggu 7 buried hill reservoir.Found the xingu 7 double medium metamorphic rock reservoir show that the fracture system of waterflood development mode can no longer meet the needs of oilfield production,therefore,non hydrocarbon gas injection development become a new research target.The transformation development needs to establish the corresponding indoor test method.Including core displacement test,indoor recombination and PVT analysis test method.The effects of porosity and permeability on gas injection test were investigated.The main indexes of gas injection effect of three non-hydrocarbon gases were measured.And analyze the suitable non-hydrocarbon gases.For the xingu 7 such double medium buried hill reservoirs of metamorphic rock reservoir using conventional water injection mode mining may not appropriate,because of the stable water injection can only be relatively large cracks within the oil out,and it is hard to relatively small gap within the oil out.If the gas injection development can be adopted,the development and promotion of good rock pore throat capillary permeability.Dissolution is likely to greatly improve its development effect and oil displacement efficiency.Then the core displacement test was carried out to understand the influence of porosity and permeability on gas injection test.The physical parameters of the real core and the core after the fracture are compared and analyzed(permeability,porosity),and the starting pressure of the core under different seam widths.The core gas injection method is obtained and the different characteristics and adaptability of different gases are analyzed.Establish the corresponding test method.Including: The analysis shows that the CO2 injection test is the best,with significant dissolution displacement and viscosity reduction.The effect of air injection is better than that of nitrogen injection,because the low temperature oxidation will occur in the oil layer,improving the quality of oil products.