Predication method for natural decline rate at super-high water-cut later period of water flooding development oil reservoir
A technology of ultra-high water content and prediction method, which is applied in the direction of prediction, data processing application, calculation, etc. It can solve the problems of cumbersome model establishment, inconvenient application of error, unfavorable mine application, etc., and achieve the effect of avoiding the analysis of influencing factors
Inactive Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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The application limitations of this method are that first, the establishment of the model is cumbersome, which is not conducive to field application; how to predict the natural decline rate of the oilfield composed of the parameters of multiple different types of reservoirs, there is a large error and it is inconvenient to apply
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[0017] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.
[0018] like figure 1 as shown, figure 1 It is a flow chart of the method for predicting the natural decline rate in the late stage of super-high water cut in the water flooding development reservoir of the present invention.
[0019] In step 101, the annual natural decline of production is calculated, and the annual natural decline of production is calculated from the development indicators in recent years to obtain the calculation formula of the decline rate. In one embodiment, the annual natural decline of production is calculated according to the actual data of oil field A, and the unit is 10,000 tons, and the annual natural decline and production are calculated (see Table 1).
[0020]
[0021] where Q 总产量 To calculate the total output of the ...
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The invention provides a prediction method for the natural decline rate at a super-high water-cut later period of a water flooding development oil reservoir. The prediction method comprise the steps of calculating the annual production natural decline amount according to development indexes in recent years, and calculating the annular natural decline rate; calculating an annual year injection-production ratio according to the annual water injection volume of a calculated oil field and the deficit amount of a statistical stratum in the recent years; calculating stratum number injection-production corresponding rate at the annual year end of the calculated target in the resent years; carrying out liner fitting on the product of the annual year injection-production ratio and the stratum number injection-production corresponding rate and an annual output natural decline amount variation so as to acquire a calculation formula for measuring and calculating the annual output natural decline amount; calculating the natural output decline amount of the next year according to the calculation formula of the annual output natural decline amount, and then calculating the natural decline rate according to a calculation formula of the decline rate. The prediction method for the natural decline rate at the super-high water-cut later period of the water flooding development oil reservoir can meet application requirements of the oil field, and effectively guides practices at a super-high water-cut later development period of medium and high permeability water flooding oil reservoirs.
Description
technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for predicting the natural decline of a high-permeability water-flooding development reservoir in the late stage of ultra-high water cut. Background technique [0002] The natural decline rate refers to the decline rate of the total production without new wells put into production and various production stimulation measures, that is, the difference between the oil production of the stage after deducting the oil increase of new wells and various production stimulation measures and the total oil production of the previous stage, and then compared with the previous stage. The ratio of stage oil production is called natural decline rate. In actual mine practice, the extrapolation method of natural decline rate is used to predict the natural decline in the next stage. Since the total oil recovery in the previous stage decreased year by year in the late stage of ...
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IPC IPC(8): G06Q10/04
Inventor 肖武邴绍献侯春华王滨颜子张超张金铸张孝天赵伟彭国红孙颖
Owner CHINA PETROLEUM & CHEM CORP
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