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Polymer flooding production optimization method and system based on Monte Carlo algorithm

An optimization method and polymer technology, applied in the field of oil and gas field development, can solve the problems of difficult on-site practical application, the time change of the production control scheme is not smooth enough, and achieve the effect of accelerating the convergence speed, improving the convergence speed, and easy to achieve.

Active Publication Date: 2017-09-29
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

However, the production control scheme generated by the random disturbance approximation algorithm changes very sharply in time and is not smooth enough, so it is difficult to be practically applied in the field.

Method used

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  • Polymer flooding production optimization method and system based on Monte Carlo algorithm
  • Polymer flooding production optimization method and system based on Monte Carlo algorithm
  • Polymer flooding production optimization method and system based on Monte Carlo algorithm

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Embodiment

[0108] The model block in this embodiment is a typical formation with high permeability zone, the grid number is 21×21×1, the grid length is 50m, and the thickness is 20m. The average porosity and permeability are 949mD and 0.25 respectively, the initial oil saturation is 0.67, and the initial reservoir pressure is 10.426MPa. Such as Figure 2aAs shown, it is the normalized gradient diagram optimized by using the prior art polymer flooding production optimization method, that is, optimized by the standard Monte Carlo approximation method, and Fig. 2b is the optimized gradient diagram by the improved Monte Carlo approximation method of the present invention normalized gradient map, combined with Figure 2a with Figure 2b It can be seen that the gradient obtained by the optimization method of the present invention is closer to the real gradient, so the optimization efficiency is higher and the convergence speed is faster. Such as image 3 As shown, the permeability field o...

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Abstract

The invention relates to a polymer flooding production optimization method and system based on a Monte Carlo algorithm. The method comprises the steps that an optimum control function for oil reservoir optimization is generated by a simulator according to an oil reservoir value; a covariance matrix is generated by a solving model, an initial disturbance vector is generated nearby an optimum control variable by utilizing the Monte Carlo approach algorithm, the initial disturbance vector is processed by adopting the covariance matrix to generate a target disturbance vector; the Monte Carlo algorithm including the target disturbance vector is adopted to solve the optimum control function, and an optimum injection-production parameter corresponding to optimum exploitation benefit is generated. The calculation process of the method is simple and easy to achieve, the optimization efficiency is high, the convergence rate is high, the system is easily combined with any oil reservoir value simulator to calculate polymer flooding production, injection-production well production parameters and injection polymer concentration can be simultaneously optimized, an oil reservoir development effect can be remarkably improved, and a basis can be provided for scientific, reasonable and efficient oil field development. The method can be widely applied to the field of oil-gas field development.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a Monte Carlo algorithm-based polymer flooding production optimization method and system. Background technique [0002] Oilfields at home and abroad have entered a stage of high water cut after years of water flooding development, and the oil displacement efficiency of water flooding has dropped significantly, seriously affecting the development effect. Therefore, in order to redevelop old oilfields, tertiary oil recovery has been gradually promoted, among which polymer flooding is the most important tertiary oil recovery technology to improve sweep efficiency and thus development effect. Although the cost of polymer flooding is relatively high, it is widely accepted by engineers because it can achieve obvious effects of reducing water to increase oil production or controlling water to increase oil production. It is precisely because this technology has the disadvant...

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Application Information

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IPC IPC(8): E21B43/22G06F17/50G05B13/04
CPCE21B43/16G05B13/042G06F30/23G06F2111/04Y02A10/40
Inventor 赵辉谢晓庆张贤松康晓东石爻曾杨
Owner CHINA NAT OFFSHORE OIL CORP
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