Study On The Technology Strategies Of Improving Oil Recovery For Xiaermen Oilfield

For the high water-cut oilfields, how to increasing the development benefits and ultimate recovery, improving oil recovery are the main problems of the oilfields development in our country. Xiaermen oilfield has been adjusted many times since it was put into development in 1978. By developed effectively near upon 30 years, it forms a complexion with high well density, high degree of reserve recovery, high integrate water-cut, high reserves utilization degree and complex remaining oil distribution underground. It faces the problem that the baking resource is not adequate, the oil production rate decreases year by year. Therefore, it is essential to adjust its developing scheme, and design the development countermeasure of residual reserves, in order to increasing its economic benefit and enhance its ultimate recovery, improving oil recovery.This paper takes lower-layer system of Xiaermen oilfield as object studied, studies on improving oil recovery of lower-layer system of Xiaermen oilfield. We must fully know the distribution of the residual reserves of lower-layer system of Xiaermen oilfield, in order to develop its residual reserves efficiently, guide designing its development adjustment scheme. Therefore, the paper integrates reservoir engineering methods and reservoir numerical simulation to study the distribution of remaining oil. On this base, the paper considers the economic indicator of most tap production potential methods the current development actuality of lower-layer system of Xiaermen oilfield, design two water flooding well pattern optimization schemes and two crosslinked polymer flooding adjustment schemes by using well pattern optimizing combination technology and crosslinked polymer flooding technology, and predicts the future by using reservoir numerical simulation technique. Finally, based on the result of simulation, we optimize these schemes through evaluating its economic state and the development effect.The main contents of the paper are as follows:1. Study of lower-layer system of Xiaermen oilfield reservoir numerical simulation. The simulation model is built after fully collecting the dynamic and static data, and based on the result of reservoir modeling. Then, using black-oil simulator, history match is performed by adjusting the simulation model and particular disposal in order to keep the geological reserve, cumulative oil production, field water cut of the oilfield, and the oil production, cumulative oil production, water cut of all wells. Through history matching, about 87 percent of wells accord with its real...