Optimal control theory based optimal design method of polymer flooding scheme

A technology of optimal control theory and optimal design, applied in earth-moving drilling, production of fluids, wellbore/well components, etc.

Inactive Publication Date: 2012-02-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Optimal control theory based optimal design method of polymer flooding scheme
  • Optimal control theory based optimal design method of polymer flooding scheme
  • Optimal control theory based optimal design method of polymer flooding scheme

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[0167] Example: Gudong District 2 screened out a polymer injection area with an area of ​​4.2km 2 (See figure 2 ), the effective thickness is 12.4m, and the selected reserves are 1039×10 4 t, pore volume 1710.0×10 4 m 3 . The model design includes 73 water wells and 159 oil wells. Plane grid division adopts a uniform rectangular grid of 50m×50m, with 80 grids in the X direction and 110 grids in the Y direction.

[0168] During the polymer injection process in the mine, the polymer solution is configured by the injection station, and the injection concentration of each well is the same as that of the configured polymer solution, so it is difficult to adjust the injection concentration of each well separately. Therefore, in the process of program optimization, each well adopts the three-slug injection method, and the concentration of the three-slug and the injection time of each slug are taken as optimization variables. The original injection scheme was 1.8g / L for a singl...

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Abstract

The polymer is an expensive chemical product, and the injection of the polymer is a long and complex process. In order to scientifically decide a developing scheme for obtaining better economic benefit, the invention provides an optimal design method of a polymer flooding scheme which is based on an optimal control theory. The performance index of the optimal control problem can be the maximum net present value, the governing equation is the transfusion fluid mechanics equation of the polymer flooding process, the inequality constraints of the polymer amount and the injection density are considered, and an optimal control model of a polymer flooding distributed parameter system with the inequality constraints is built. By utilizing the Pontrjagin maximal principle, the necessary conditions of the polymer flooding optimal control problem are deduced, an improved subspace cutting off Newton method is provided and is used for solving the segment optimization problem with a decision variable boundary constraint during an SUMT (sequential unconstrained minimization technique) iterative process. The optimal design method provided by the invention is put into use in the second Gudong area of Shengli oil field, and the economic benefit of the polymer flooding is obviously improved.

Description

1. Technical field [0001] This technology relates to industrial optimization control technology, especially an optimal design method of polymer flooding scheme based on optimal control theory. 2. Background technology [0002] As a non-renewable energy source, petroleum has limited underground reserves. With the development of the economy, the demand for oil is increasing day by day. Polymer Flooding refers to the method of adding water-soluble high-molecular-weight polymers into the injected water to improve the mobility ratio by increasing the viscosity of the water phase and reducing the permeability of the water phase, thereby enhancing oil recovery. Polymer flooding is just adding polymer to the original water flooding, so it is also called modified water flooding (Modified Water Flooding). Polymer flooding began in the late 1950s and early 1960s. Polymers play an important role in enhanced oil recovery methods in the United States, Canada, Germany and China. [000...

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Application Information

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IPC IPC(8): E21B43/22
Inventor 李树荣张晓东雷阳张强郭兰磊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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