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Method for improving oil recovery ratio by water injection with small pressure difference at multiple distribution points

A technology of recovery factor and pressure difference, applied in the field of improving the recovery rate of thick fault block reservoirs by using secondary bottom water, can solve the problems of improvement, unbalanced injection-production streamline, unbalanced water flooding and other problems

Inactive Publication Date: 2018-08-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After development and adjustment in recent years and combing of layers, 5 integrated fault blocks including He 31 and He 50 and 7 complex fault blocks including He 90 and He 76 have established a relatively complete injection-production well pattern, however, due to the well pattern, Influenced by factors such as interlayer and plane heterogeneity and pressure distribution differences, problems such as unbalanced injection-production streamlines, unbalanced water flooding sweep, and uncoordinated injection-production relationship are unfavorable for further improvement of recovery

Method used

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  • Method for improving oil recovery ratio by water injection with small pressure difference at multiple distribution points
  • Method for improving oil recovery ratio by water injection with small pressure difference at multiple distribution points
  • Method for improving oil recovery ratio by water injection with small pressure difference at multiple distribution points

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Effect test

Embodiment 1

[0211] There are 1 water well and 3 oil wells in the He 50-Xie 16 well group. The water wells are generally injected with water, and the vertical water absorption is uneven. The layer with a relatively high water absorption corresponds to a higher oil well fluid volume of 168 tons / day, a water cut of up to 99.1%, and a relatively low water absorption. The layer corresponds to a low well fluid volume (37.1 tons / day), and a dynamic fluid level of 977 meters. Aiming at the above problems, a water injection test with small pressure difference at multiple distribution points was carried out. Increase the frequency of unstable adjustments, and gradually refine the betting into a pattern of 150-100-50-20 squares. After the implementation, corresponding to 3 oil wells, the comprehensive water cut decreased by 1.1 percentage points, the daily oil increase was 2.9 tons / day, and the formation energy remained stable. Such as image 3 shown.

Embodiment 2

[0213] There are 4 oil wells and 4 water wells in the He 3-Sideline 19 well group. This well group belongs to the north block of He 3. Due to the influence of formation dip angle and physical properties, water flooding and water channeling have occurred many times in history. To solve this problem, we For the joint allocation of water wells in the well group, the allocation is gradually reduced according to the energy recovery of the oil wells. For oil wells with better energy recovery, adjust ginseng to extract fluid; for water wells with poor energy recovery, reduce ginseng to control fluid. According to the production situation of the oil well, the injection and production parameters of the oil and water wells are periodically adjusted. After the implementation, the daily oil increase of the well group is 3.3 tons / day, the water cut is reduced by 2 percentage points, and the validity period is 4 months. Such as Figure 4 shown.

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Abstract

The invention provides a method for improving the oil recovery rate by water injection with small pressure difference at multiple distribution points. The method for improving the oil recovery rate bythe water injection with the small pressure difference at the multiple distribution points comprises the steps that 1, an injection-production well group is selected; 2, the conceptual model of one-injection-two-recovery is established by numerical simulation, a P1 well and a P2 well are included, and quantitative research and analysis are carried out on production and injection proration; 3, inthe case of fixed water injection rate of the wells, the reasonable fluid amount of before water breakthrough is optimized; 4, the optimized fluid amount after the water breakthrough is calculated; 5,the water injection rate of the wells is reset, and the reasonable fluid production rate of the P1 well and the P2 well is optimized. According to the method for improving the oil recovery rate by the water injection with the small pressure difference at the multiple distribution points, effective displacement is expanded, every water injection interval exerts maximum potential, at the same time,the formation energy can be reasonably replenished, broad prospects in application popularization are achieved, and significant economic and social benefits can be obtained.

Description

technical field [0001] The invention relates to the field of enhanced oil recovery of thick-bed fault block oil reservoirs, in particular to a method for improving the recovery rate of thick-layer fault block oil reservoirs by using secondary bottom water. Background technique [0002] Fault-block reservoirs have entered the late stage of high water-cut development, and the overall performance is severe water flooding, high production degree, increasing natural decline, and weak foundation for stable production. After development and adjustment in recent years and combing of layers, 5 integrated fault blocks including He 31 and He 50 and 7 complex fault blocks including He 90 and He 76 have established a relatively complete injection-production well pattern, however, due to the well pattern, Influenced by factors such as interlayer and plane heterogeneity and pressure distribution differences, problems such as unbalanced injection-production streamlines, unbalanced water flo...

Claims

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Application Information

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IPC IPC(8): E21B43/20
CPCE21B43/20
Inventor 焦红岩屈春艳张戈刘中伟金亮宇刘文强鲁轩秦健飞王晓妮李秀华
Owner CHINA PETROLEUM & CHEM CORP
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