New method for measuring and calculating economic limit well-drilling potential and recovery ratio of old oilfield
A technology of economic limit and recovery factor, which is applied in earth-moving drilling, surveying, wellbore/well components, etc. It can solve the problem of not taking economic factors into account and unable to effectively guide the development and production practice and mine field guidance of old oilfields in the ultra-high water cut period. Sexual incompetence, etc.
Active Publication Date: 2018-06-19
CHINA PETROLEUM & CHEM CORP +1
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Second, the calculation formula of the traditional method only involves reservoir geology and development parameters, without considering the influence of economic factors, and has little guidance for the actual operation of the mine
Third, there are contradictions between the calculation results of traditional methods and the actual development and production conditions. For example, the well pattern density of some ultra-high water-cut reservoirs has exceeded the limit well pattern density, but it still has development benefits.
It can be seen that the traditional method can no longer effectively guide the development and production practice of mature oilfields in the ultra-high water-cut period
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[0027] 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.
[0028] Step 1. Determine the economic limit recoverable reserves of a new drilling single well. The dynamic cash flow method is used to establish the chart of the relationship between single well economic limit recoverable reserves and oil price, so as to determine the economic limit recoverable reserves of new drilling wells at a certain oil price and a certain drilling depth.
[0029] Step 2, determine the recovery factor of the new drilling. Calculate the newly drilled recoverable reserves of development units or oilfields in recent years; use Tong Xianzhang’s water-driven reserve formula N d =7.5 / B (coefficient B is the slope of the Type A water drive characteristic curve), calculate the actual water drive reserves of the new drilling; calculate t...
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The invention provides a new method for measuring and calculating the economic limit well-drilling potential and the recovery ratio of an old oilfield. The new method for measuring and calculating theeconomic limit well-drilling potential and the recovery ratio of the old oilfield comprises the steps that 1, the single well economic limit recoverable reserve of a newly drilled well is determined;2, the recovery ratio of the newly drilled well is determined; 3, single well controlled economic limit geological reserve of the newly drilled well is determined; 4, economic limit newly-drilled-well potential is calculated; and 5, the economic limit recovery ratio is calculated. According to the new method for measuring and calculating the economic limit well-drilling potential and the recoveryratio of the old oilfield, the contradiction of a traditional method in application of the super high water-cut development later stage is overcome, and the demands of calculating the economic limitwell-drilling potential and the economic limit recovery ratio of a super high water-cut stage oil reservoir can be met, therefore, the oil reservoir development potential can be evaluated more objectively, and the production practice of oilfield development is guided.
Description
technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a new method for measuring and calculating the economic limit drilling potential and recovery factor of an old oil field. Background technique [0002] At present, the new drilling potential of oilfields commonly used in mines is generally calculated by using the "relationship between well pattern density and recovery factor". This relational formula is an empirical formula obtained by regression of some development units with simple structure, large oil-bearing area and high permeability, such as Shengtuo and Gudao, as sample points, namely [0003] [0004] in: [0005] E. R — recovery factor, decimal; [0006] K e —effective permeability, μm 2 ; [0007] mu o - Formation crude oil viscosity, mPa s; [0008] n—well pattern density, well / km 2 ; [0009] This method has a good guiding effect on the infill adjustment of oilfields in the middle an...
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IPC IPC(8): E21B47/00
CPCE21B47/00
Inventor 肖武张孝天张海燕赵小军海会荣王华张以根魏新辉张超
Owner CHINA PETROLEUM & CHEM CORP