Residual Oil Comprehensive Evaluation Method In High Water Cut Stage

At present, most of China's oil fields after decades of development (including flood development), has entered the high (extra high) water cut development period, and the recovery efficiency has declined markedly. Therefore the main task of oil field development and adjustment in high water cut period is to "look for residual oil and exploit residual oil." Daqing oil field has gone through 50 years of flood development, the cumulative production is currently 1950 million tons of crude oil, and the produced geological reserves is nearly 42%. There are almost 60% of the geological reserves still underground. How to make clear residual oil potential and distribution of all kinds of reservoir underground is an important subject of Daqing Oilfield at later stage of high water cut.For geological problems faced by oil field development, the passage regard the residual oil distribution and quantitative evaluation in high water cut stage as the scope of study and research the residual oil comprehensive evaluation method in high water cut stage. Through the analysis of residual oil distribution rule, distribution control factors and affecting factors of degree of reserve recovery, combined the study of calculation procedure of remaining geological reserves and divided method of input and output rate in a single well layer, optimize the residual oil evaluation parameters and method in high water cut stage. Combined the residual oil comprehensive evaluation software in high water cut stage, achieve the purpose of residual oil comprehensive evaluation and prediction method study in high water cut stage.Study of residual oil is a worldwide priority research topic for the oil-producing countries and has become an eagerly resolved difficult problem of the international oil academics which causes common concern of the worldwide oil-producing countries. Saertu oil field, after more than forty years of flood development, has currently entered the high water cut development period.development phase. With the development of the oil field becoming more deeply, the recovery efficiency decreases markedly and the exploitation of oil and gas becomes more difficult.In order to keep rate maintenance and enhance oil recovery, strengthening the study of residual oil distribution and evaluation in high water cut stage is not only of great theoretical significance, but also of important practical significance for bettering sequel development, recovery stability and enhancement.