Inter-well lateral flooding synergistic method for large-bottom-water oil reservoir

Abstract

The invention provides a large bottom water reservoir inter-well lateral flooding synergistic method which comprises the following steps: S1, establishing a three-dimensional bottom water reservoir physical model device according to the relative thickness of a stratum where a to-be-displaced oil well is located and an oil layer, the inter-well distance and the relative size of bottom water parameters, and calculating the dosage of a plugging agent; s2, designing three water plugging slugs, namely a partition slug, a displacement slug and a displacement slug, and calculating the total injection amount according to the pore volume of the oil reservoir; s3, according to the production pressure gradient, the injection-production ratio and the stratum permeability, the injection pressure values and the injection displacement of the three water plugging slugs are calculated in combination with the plugging agent dosage calculated in the step S1 and the total injection amount calculated according to the oil reservoir pore volume in the step S2; and S4, the three water plugging slugs are injected into the stratum of the oil well to be displaced according to the calculated injection displacement in sequence for displacement construction. By means of the mode that the front partition plate and the lateral displacement technology are combined, efficient displacement of the inter-well remaining oil is achieved, the utilization rate of the inter-well remaining oil is improved, and the later recovery rate is greatly increased.

Description

technical field [0001] The invention relates to the technical field of petroleum development, in particular to a method for increasing the efficiency of lateral flooding between wells in large bottom water reservoirs. Background technique [0002] The Tahe clastic rock reservoir has the characteristics of "one ultra-three high": ultra-deep (burial depth 4200-5100m), high temperature (90-137°C), high salinity (total salinity of formation water 21*10 4 mg / L, calcium and magnesium particle content 1.2*10 4 mg / L), high water-oil system ratio (above 500). With the development of the reservoir, due to the strong heterogeneity of the reservoir, the coning of the bottom water during the development of the clastic rock bottom water reservoir in the Tahe Oilfield caused serious water flooding of the oil well, and the remaining oil was mainly distributed in the low-permeability section around the well and the reservoir. Layer heights and interwells are control areas. In the early st...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem in the prior art that there is no effective control method for the enrichment of remaining oil between wells in bottom water reservoirs in the later stage of recovery, the present invention provides a method for increasing the efficiency of lateral flooding between wells in large bottom water reservoirs. The combination of slab and lateral displacement technology realizes high-efficiency displacement of remaining oil between wells, improves the production of remaining oil between wells, and greatly improves the recovery rate in the later stage

Images