Method for determining reasonable injection-production ratio of ultra-low permeability reservoir
A technology for determining method and injection-production ratio, applied in special data processing applications, mining fluids, earthwork drilling and mining, etc., can solve the problems of high cost and low accuracy, and achieve the effect of low cost and simplified determination process
Pending Publication Date: 2021-01-26
YANCHANG OIL FIELD
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[0003] The purpose of the present invention is to provide a reasonable injection-production ratio determination method for ultra-low permeability reservoirs, which solves the problems of low accuracy and high cost of existing prediction methods
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Embodiment
[0026] Taking the Chang 6 oil reservoir in the 236 oil area of the ywm oilfield as an example, there are 15 water injection well groups in this oil area, corresponding to 46 oil wells. The output is steadily increased in the well group to determine the reasonable injection-production ratio of the block, specifically:
[0027] Step 1, collect the dynamic analysis data table of the y-1 well group, see Table 1 for details, draw the injection-production curve of the y-1 well group, such as figure 1 Shown; sequentially arrange and draw the injection-production curves of the remaining 14 well groups;
[0028] Table 1. Monthly dynamic data table of y-1 well group
[0029]
[0030] Step 2, according to the water injection effect of each well group in the block, it is found that there are 10 well groups in the block that are stable production well groups, and the relationship curve between injection-production ratio and production and water cut of the y-1 production stable water ...
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The invention discloses a method for determining a reasonable injection-production ratio of an ultra-low permeability reservoir, which is specifically implemented according to the following steps of:1, collecting and arranging a well group dynamic analysis data table in a block, and drawing a well group injection-production curve; 2, according to the well group injection-production curve drawn inthe step 1, analyzing the water injection effective condition of each well group in the block, finding out a yield stable-rising well group, and drawing a relation curve of the injection-production ratio of the yield stable-rising well group and the yield and water content; 3, analyzing the injection-production ratio and yield and water content relation curve of the yield stable-rising well groupdrawn in the step 2, and determining the reasonable injection-production ratio of each well group; and 4, determining the reasonable injection-production ratio of the block according to the reasonable injection-production ratio of each well group determined in the step 3 by adopting a weighted average method. The method solves the problems that an existing prediction method is low in accuracy andhigh in cost.
Description
technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to a method for determining a reasonable injection-production ratio of an ultra-low permeability reservoir. Background technique [0002] The injection-production ratio is the ratio of the underground volume of the injected water to the underground volume of the produced fluid. It is a comprehensive indicator that characterizes the balance of injection and production during the water injection development process of an oilfield and reflects the relationship between liquid production, oil production and formation pressure. It is an important basis for designing oilfield injection ratio. A reasonable injection-production ratio is an injection-production ratio that can maintain a certain formation pressure in the oilfield and maintain a stable production increase without causing the water cut in the oil well to rise too fast. At present, the design methods of injection-pr...
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IPC IPC(8): G06F30/20E21B43/20G06Q50/02
CPCG06F30/20E21B43/20G06Q50/02
Inventor 黄红兵杨勇曾召庆欧阳华劲许金良张军连杨彩玲
Owner YANCHANG OIL FIELD