Development Of Dynamic Analysis And Program Adjustment Of Shinan-21Well Block J₂t₂Reservoir

It is defined that permeability range from0.1×10^-3μm to50×10^-3μm as low-permeability reservoirs. China is rich for reserves of low-permeability reservoirs, butdifficult to develop universally. Because low permeability natural reservoir, whichenergy is small, production decline fast, the complex system of underground cracks,conventional development is often difficult to get good benefits. With the continuousimprovement of the exploration and development, the old area hold stable productionis more and more difficult, to develop the use of low permeability, and very lowpermeability reservoir is the only way for Chinese oil industry to increase reserves andproduction.Shinan-21District J₂t₂reservoir, which average porosity is14.3%, and averagepermeability is9.18×10^-3μm, is a typical low porosity and low permeabilityreservoirs. On the basis of understanding of the geological development of dynamicanalysis and numerical simulation methods to the remaining oil distribution in theprediction of adjustment programs, made the following main points of understanding:（1）.Through the geological understanding, found Shinan-21District J₂t₂reservoirlocal area has some of the micro-structure,3the sand J₂t₂¹, J₂t₂², J₂t₂³top-down widenthe range of connectivity, the thickness increase each sand layer in the flat and verticalwith a strong heterogeneity.（2）.Through the dynamic analysis of development to derive prediction recovery of35%,12.467million tons of recoverable reserves, reservoir water cut is increased in areasonable range within Note mining layer corresponds to the situation.（3）.By numerical simulation, analyzed that the remaining reserves of2988104t,mainly distributed in the vertical the J₂t₂², J₂t₂³layer of which J₂t₂³the greatestpotential is the main potential layer.（4）.Through research of the exploitation of technology policy demonstration, come to the reservoir well density, the formation pressure to maintain the level ofinjection pressure system boundaries. Through reasonable injection and reasonable oilproduction rate of injection-production ratio and the oil production rate is high.（5）.Establish a variety of adjustment programs, and use numerical simulationtechniques to simulate forecast nine o’clock water injection in the existing wellnetwork on the basis of anti-adjusted five-point injection through the program of thecomprehensive analysis of economic indicators, and extract production, can improveeconomic efficiency.