Method for obtaining well test interpretation parameters of polymer flooding three-layer channeling reservoir

A technology of well test interpretation and acquisition method, which is applied in the field of acquisition of well test interpretation parameters in polymer flooding three-layer cross-flow reservoirs, and can solve the problem of not having a well test interpretation model, affecting the effect of polymer flooding, ignoring polymer and formation Issues such as rock diffusion and convection

Active Publication Date: 2017-05-31
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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Problems solved by technology

Although some progress has been made in the corresponding well testing techniques for composite reservoirs and double-layer channeling reservoirs, so far, most well testing interpretation models simply describe the rheological properties of polymer solutions as power-law fluids. , while ignoring the effects of diffusion and convection between polymers and formation rocks, and there is no well test interpretation model that can explain polymer-flooding three-layer channeling reservoirs, making it difficult to interpret the test data of many oilfields such as Daqing, Liaohe and Bohai. As a result, oilfield management personnel cannot timely understand the reservoir conditions and take corresponding measures, thereby affecting the effect of polymer flooding

Method used

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  • Method for obtaining well test interpretation parameters of polymer flooding three-layer channeling reservoir
  • Method for obtaining well test interpretation parameters of polymer flooding three-layer channeling reservoir

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Embodiment 1

[0192] The partially hydrolyzed polyacrylamide used in this example is provided by China National Offshore Oil Corporation. The polyacrylamide has a degree of hydrolysis of 27% and a molecular weight of 4630. The simulated formation water is combined with magnesium chloride, calcium chloride and sodium sulfate to produce an ion concentration of 43,000 mg. / liter of salt water. The flow velocities of the polymer solution in the wellbore and the perforation section were 0.0368 m / s and 0.3316 m / s, respectively, and the polymer solution was mechanically degraded and left to stand for one day. In order to eliminate the influence of mechanical degradation on the rheology of the polymer solution, pipe flow with different radii was used to simulate the flow of the polymer solution from the wellbore to the perforation section (e.g. figure 2 shown), using a HAAKE rheometer (Hake rheometer) with a rotational speed of 60,000 rpm to measure different concentrations of polymers in 0.01s ...

Embodiment 2

[0195] This embodiment has carried out the well test explanation to the polymer flooding well of Bohai Oilfield, and in the present embodiment, the measured data of the oil field and the theoretical graph plate fitting curve (such as Figure 10 shown), and the interpretation data of reservoir permeability, skin factor and wellbore storage coefficient were obtained (as shown in Table 1). The data before polymer flooding in Table 1 are the test data of wells in this oilfield during water flooding, and the data after polymer flooding are relevant data for well test interpretation of this oilfield well. From the interpretation results, it can be seen that the first oil layer, the second oil layer The change of permeability skin coefficient is small, the permeability of the third oil layer decreases more, and the skin coefficient increases more. It is analyzed that polymer plugging occurs in this oil layer, so acidification measures are taken for this layer. After the measures, the ...

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Abstract

The invention relates to a method for obtaining well test interpretation parameters of a polymer flooding three-layer channeling reservoir. The method for obtaining the well test interpretation parameter of a polymer flooding three-layer channeling reservoir comprises the following steps that (1) according to rheological properties of a polymer solution, modifier formulas of a polymer solution viscosity model are determined, and according to characteristics of the polymer flooding three-layer channeling reservoir, a physical model of the polymer flooding three-layer channeling reservoir is established; (2) according to the modifier formulas of the polymer solution viscosity model and the physical model of the polymer flooding three-layer channeling reservoir, a mathematical model of the polymer flooding three layers channeling reservoir is determined; (3) the mathematical model of the polymer flooding three-layer channeling reservoir is solved through a finite difference method, and the numerical solution of the bottom hole pressure is obtained; (4) wellbore storage coefficients, formation coefficients, storage capacity ratios, time and the bottom hole pressure are nondimensionalized, and typical curve theoretical map of the polymer flooding three-layer channeling reservoir is drawn; and (5) the reservoir permeability, the skin factor and the wellbore reservoir coefficients of the polymer flooding three-layer channeling reservoir are obtained by fitting the typical curve theoretical map of the three-layer polymer flooding reservoir with measured data curves of oilfields.

Description

technical field [0001] The invention relates to a method for obtaining well test interpretation parameters of a polymer flooding three-layer channeling reservoir, and belongs to the technical field of well test. Background technique [0002] Polymer flooding, especially partially hydrolyzed polyacrylamide (HPAM) polymer flooding, is the most commonly used method to enhance oil recovery due to its advantages of low cost and high efficiency. The main mechanism of polymer flooding to enhance oil recovery is to increase the swept volume by improving the viscosity index of porous media. However, when the polymer passes through the reservoir rock, its adsorption and retention will cause reservoir damage or decrease in permeability. Therefore, it is necessary to adopt corresponding techniques for evaluating reservoir damage after polymer flooding. [0003] Well testing method is the main method to obtain reservoir permeability and skin factor, and then evaluate the degree of reser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22G06F17/50
CPCE21B43/16G06F30/23Y02A10/40
Inventor 曾杨康晓东唐恩高谢晓庆杨光
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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