Low Permeability Reservoir Recoverable Reserves Calculation Method Research

We ofen see the words which are generally called "Recoverable Reserves" in the english literaturese. Recoverable Reserves refers to the reliable reserves which have the economic benefits, with permission the existing technology and economic conditions. they usually is the material basis of oilfield development, construction, and the measure the level of the oilfield development indexes. Because of recoverable reserves of oil field is the direct embodiment of the economic value, so accurate estimates oilfield recoverable reserves for the development of oil fields is great significance.Domestic oil recovery and recoverable reserves more mature calculation method is applicable to many high permeability reservoirs, generally does not apply to low permeability reservoirs. The peripheral oil fields in Jilin oil can be summarized "Three low", low permeability, low abundance, low yield; It belongs to low permeability reservoir, and its evaluation method and principle of evaluation and the high permeability reservoirs reserves evaluation have a large difference.There are so many calculation methods of recoverable reserves, mostly from the Angle of oilfield development with dynamic material as the research object, such as experience formula method, engraving method, waterflooding characteristic curve method, decreasing curve method, the analogy method and numerical simulation methods. This kind of method is based on the characteristics of mathematical statistics as the means, in the reservoir engineering based on the theory of field data based on established relationship, in different conditions are predicted. Based on the collection of a lot of basic parameters from the25Jilin oil development units, using multiple regression theory after repeatedly fitting get relevant experience formula, the application of the return of jilin low permeable oilfield experience formula. Jilin oil to the development of low permeability oil field calculation, confirmed the results of the validation of the recovery and the actual calculating dynamic calibration recovery difference, the results show that the new formula for calculation of the return of Jilin low permeable oilfield recovery is reliable, accurate.In order to improve the recoverable reserves on the reliability of the calibration results, reflects the oil field development adjustment measures effect, through to the oilfield in Jilin oil reserves of calibration and validation and made sure the new experience formula satisfy Jilin oil low permeability reservoir recoverable reserves of calibration, the results are true and effective.