Novel method for measuring and calculating well pattern thickening potential

Abstract

The invention provides a novel method for measuring and calculating well pattern thickening potential comprising following steps: 1. determining oil well single well economic limit recoverable reserves; 2. determining the relationship between the average single well increased recoverable reserves of a close-spaced well and the well density; 3. determining the density of the economic limit well pattern; 4. calculating the drilling well workload of well pattern thickening; 5. calculating the potential of well pattern thickening for increasing recovery efficiency. The novel method for measuring and calculating well pattern thickening potential can satisfy the demand of calculating technical economical policy limit such as economic limit well pattern density and limit thickening potential of extra high water reservoir, and can be more objective in evaluating the exploitation potential of oil reservoirs and guiding the oil field development production practice.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a method for evaluating the development potential of an old oil field, that is, the measurement and calculation of the well pattern intensification adjustment workload of the old oil field and the prediction of the enhanced recovery rate. Background technique [0002] At present, the current well pattern intensification potential in oilfields and mines is generally calculated by using the "well pattern density and recovery rate relationship formula". The unit is the empirical formula derived from the regression of the sample point, that is, [0003] E R = E D × E V = ( 0.742 + 0.19 lg K e μ o ) · ...

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Problems solved by technology

[0009] This method has a good guiding effect on the infill adjustment of oilfields in the medium-low water-cut development period, but after entering the high-water-cut development period, the contradiction between this method and the actual development becomes more and more serious, which is mainly reflected in two aspects: first, from the formula In itself, with the increase of well pattern density, only the swept volume will be increased, but the oil displacement efficiency will not be changed. Field practice has proved that the displacement pressure difference between wells can be increased by infilling, thereby improving the oil displacement efficiency, and with With the increase of well pattern density, the impact on oil displacement efficiency becomes more and more obvious, this factor cannot be reflected in the original formula; second, the calculation method of economic limit well pattern density deviates from the actual situation, and some oil in the ultra-high water cut period Although the well pattern density of the reservoir has exceeded the economic limit well pattern density, it still has development benefits

It can be seen that the traditional method is no longer suitable for the characteristics of oilfield development in the ultra-high water-cut period

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