Waterflooding Development Method for Reservoirs in Ultra-high Water Cut Stage

Abstract

The invention discloses an oil deposit water-driving exploiting method of an ultra-high water-containing period. The oil deposit water-driving exploiting method solves the problem that the existing water-driving exploiting method of the oil field of the ultra-high water-containing period is poor in effect, adopts a 'two and three combined' exploiting method and particularly comprises: fully utilizing a deployed secondary oil-layer polymer flooding infilled well pattern within about three years before tertiary oil recovery of a secondary oil layer, performing flooding infillled adjusting digging on a first set of polymer flooding layer of the secondary oil layer according to a tertiary oil recovery layer by applying fine geological research results, building a new driving system through selective perforating, organically combining flooding secondary oil recovery with tertiary oil recovery, strengthening flooding secondary oil recovery on a structural unit with remaining oil enriched in the thick oil layer, simultaneously performing proper comprehensive adjusting and then turning into the tertiary oil recovery at a proper time. According to verification, the oil deposit water-driving exploiting method of the ultra-high water-containing period achieves the aim of improving flooding exploitation effect, enhancing oil recovery and prolonging validity of flooding exploitation, and can guide the exploitation and adjustment of the ultra-high water-containing period of the oil field.

Description

technical field [0001] The invention relates to an oil reservoir development method and an adjustment technology, belonging to a multi-reservoir heterogeneous sandstone oil field development method and an adjustment technology in an extra-high water-cut period. Background technique [0002] Lamadian Oilfield is a layered sandstone oilfield controlled by structure, and is a typical sandstone oil reservoir. It has the geological characteristics of layered sedimentation and structure control of sandstone oil reservoirs, and is very typical and representative in sandstone oil reservoirs. [0003] Lamadian Oilfield is located at the northernmost tip of Daqing Changyuan, with an oil-bearing area of ​​100km 2 , geological reserves 81472×10 4 t, put into development in 1973, after seven large-scale development adjustments, entered the ultra-high water-cut development stage (water cut > 90%) in 1997. At present, the production degree of oil layers is high (water flooding ratio 9...

AI Technical Summary

Problems solved by technology

However, due to the scattered distribution of injection-production wells for adjustment and treatment, it is difficult to achieve large-scale effects; in addition, all the above-mentioned adjustments and treatment are carried out under the existing 300m injection-production well spacing, and no fundamental changes have been realized (the degree of control is still <70m %), especially the refilling measures, disrupted the original development strata, resulting in intricate injection-production relationships in underground well patterns, which brought greater difficulties to later development and adjustment

[0006] In the ultra-high water-cut development stage, what development method should be adopted so that the conventional adjustment technology and means of water flooding can be used to tap the remaining oil on a large scale in water flooding, so as to slow down the decline of water flooding production, maintain the scale of water flooding production, and increase recoverable reserves , control the rising rate of water cut, and reduce the low-efficiency and invalid injection-production cycle in thick oil layers, there are few reports at home and abroad so far

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