Adjusting method for oil field injection and extraction system in ultra-high water-containing period

A technology of ultra-high water cut period and adjustment method, which is applied in the field of oil field injection-production system adjustment, and can solve problems such as high water injection pressure, imperfect injection-production well pattern, and water injection capacity that cannot meet the liquid production rate, etc.

Inactive Publication Date: 2008-03-26
DAQING OILFIELD CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the injection-production system adjustment in the existing ultra-high water-cut period is mainly aimed at the large ratio of the number of oil-water wells in the area of ​​the block layer refers to the reverse nine-point method, and the water injection capacity cannot meet the liquid production. In order to meet the needs of high water injection pressure, low formation pressure and flow pressure, oil field casing damage comparison, and imperfect injection-production well pattern in some well areas, an adjustment method for oilfield injection-production system in extra-high water-cut period is provided

Method used

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  • Adjusting method for oil field injection and extraction system in ultra-high water-containing period
  • Adjusting method for oil field injection and extraction system in ultra-high water-containing period

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specific Embodiment approach 1

[0005] Specific implementation mode 1: (see Fig. 1 to Fig. 5) the adjustment method of the oilfield injection-production system in the extra-high water-cut period of this embodiment is realized according to the following steps: 1. Firstly, the injection-production system is optimized and adjusted, and the interval between injection and production is adopted. Injection-production mode in which the side wells of the side wells form a horizontal linear water injection well pattern, or the injection-production mode in which the corner wells are transferred to form a five-point area well pattern, or the injection-production method in which the side wells of the injection-production well row form a vertical linear water injection well pattern, or interval The injection-production method in which corner wells are transferred to form massive water injection units, or the side wells of interval transfer-injection and production wells form two rows of water injection wells sandwiched by t...

specific Embodiment approach 2

[0006] Specific embodiment two: (referring to Fig. 1) this embodiment adopts the injection-production mode that the side wells between the injection and the production rows form a horizontal linear water injection well pattern, and the well spacing (between any two adjacent water injection wells and oil production wells) ) adjusted to an average distance of 175m. In this embodiment, the degree of water flooding control is as high as 94.4%, among which the proportion of multi-directional connection is 55.8%, the improvement range is 23.4%, the ultimate recovery value can reach up to 44.7%, and the connection relationship with the original well pattern is good.

specific Embodiment approach 3

[0007] Specific implementation mode three: (see Figures 1 to 5) This implementation mode is combined with the third infill adjustment, and the well spacing (the original well spacing is 250m) is adjusted to increase the producing degree of thin poor oil layers and outer layers. The number of effective directions increased by 1.0 on average for a single well of three infill wells, and the sandstone thickness was 5.9m and the effective thickness was 1.8m for the three infill adjustment layers. After the adjustment, the production degree of the thin and poor oil layer and the outer layer of the three-time intensification adjustment layer has been significantly improved, from 59.6% and 42.4% before the adjustment to the current 70.9% and 50.4% respectively.

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Abstract

The present invention is method of regulating oil field water injecting and oil producing system in very high water containing stage, and aims at solving the problems of too great ratio between oil producing well number and water injecting well number, too high water injecting pressure, and too low stratum pressure and flow pressure in very high water containing stage. The present invention adopts water injecting and oil producing mode with transverse linear water injecting well net, five point area well net, longitudinal linear water injecting well net, and determinant type water injecting well net. The present invention can raise oil output greatly.

Description

technical field [0001] The invention relates to an adjustment method of an oilfield injection-production system. Background technique [0002] The ultra-high water cut period refers to the period when the comprehensive water cut of the oilfield reaches more than 90%. Large-scale terrigenous sedimentary multi-layer heterogeneous sandstone oilfields are characterized by multiple layers, complex shapes, and serious heterogeneity. After the large heterogeneous sandstone oilfield with multi-reservoir deposits from terrigenous deposits enters the production stage of ultra-high water-cut period, the adjustment of injection-production system is mainly for the block layer system to refer to the reverse nine-point method area well pattern (the reverse nine-point method area well pattern is a kind of injection well pattern). In the production well pattern, there are 8 oil wells around 1 water injection well, and there are 9 wells in each injection-production unit. 3 oil production we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20
Inventor 万新德方庆林立曾雪梅冷延明
Owner DAQING OILFIELD CO LTD
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