Optimization of evaluation method for recoverable reserves of polymer flooding under the condition of optimal economic benefits

Abstract

At present, there are two main methods to calibrate the recoverable reserves of polymer flooding (polymer consumption method and one-time calculation method), both of which have their advantages and disadvantages. Which evaluation method can better reflect the characteristics of polymer development and better economic evaluation effect is a problem to be studied. In this paper, the difference between the two evaluation methods is reflected by the change of the depletion rate of fixed assets in different evaluation methods of recoverable reserves. Through the comparative analysis of the economic evaluation results of the two different evaluation methods, the economic evaluation methods suitable for polymer flooding are selected. The results show that the evaluation results of polymer consumption method are better than that of one-off calculation method in the economic evaluation of fixed oil price and variable oil price. Under the fixed oil price, the difference of internal rate of return between the former and the latter is more than 2%. Under the condition of variable oil price, the polymer consumption method is obviously better than the one-off calculation method because of the high depreciation of initial production and the small depreciation of later production (large depreciation value in the early stage and less net value of oil and gas assets in the later stage). Through comparison, the evaluation method of polymer consumption is more practical, the evaluation result of block economic benefit is better, and more development potential can be released at the same time, which is more conducive to the promotion of polymer flooding technology.