Quantitative evaluation method for the adaptability of imitation strong edge water flooding technology in complex fault-block reservoirs

Abstract

The present invention provides a method for quantitatively evaluating the adaptability of imitation strong-edge water drive technology for complex fault-block oil reservoirs. Sensitivity studies on the influencing factors of strong edge water flooding reservoirs were carried out to obtain the contribution value of single factor to enhanced oil recovery; step 2, the membership function of each single factor to the effect of simulated strong edge water flooded enhanced oil recovery was established, and the Each reservoir factor of the block is brought into the membership degree function to calculate the membership degree of the single factor; step 3 is to calculate the evaluation result of the adaptability of each single factor; and step 4 is to calculate the quantitative evaluation result of the adaptability of the imitation strong edge water flooding of the fault block. This quantitative evaluation method for the adaptability of imitation strong edge water flooding technology in complex fault block reservoirs provides a set of quantitative calculation methods for judging the applicability of imitation strong edge water flooding in complex fault block reservoirs. For the judgment of the applicability of specific blocks, it is determined by The current qualitative conclusions of applicability or inapplicability have been upgraded to specific quantitative values.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for quantitatively evaluating the adaptability of imitation strong edge water flooding technology in complex fault block oil reservoirs. Background technique [0002] The imitation strong edge water flooding technology is a technology first proposed by Shengli Oilfield in recent years to improve the recovery of complex fault-block reservoirs in the ultra-high water cut period. It has achieved good development results in Shengli Oilfield. This technology is currently The existing block selection criteria were established by the Shengli Oilfield Geological Science Research Institute according to the traditional single index method. The standards are as follows: the fault block is relatively closed; the oil-water viscosity is relatively small (<50), and the water body multiple is small (<100); Larger horizontal permeability is advantageous (200×10 -3 μm...

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Problems solved by technology

There are certain defects in the use of this standard, for example, when screening different types of complex fault blocks in the Xianhe Oilfield, as shown in Table 1 and figure 2 As shown, it is found that only reverse roof weak edge water fault blocks, closed weak edge water fault blocks and extremely complex closed fault blocks are applicable, but it is impossible to judge which of these three types of fault blocks is more applicable

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