Heavy oil reservoir dissolved gas drive numerical simulation method with bubble oil phenomenon

A technology for dissolved gas flooding and heavy oil reservoirs, which is applied in the fields of climate change adaptation, electrical digital data processing, special data processing applications, etc. Influence of heavy oil dissolved gas flooding development effect, large error in simulation calculation results, etc.

Active Publication Date: 2016-11-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] Since the generation and disappearance of the foamy oil phenomenon is a dynamic process, the above-mentioned theories and methods cannot describe microscopic processes such as bubble nucleation and growth by adjusting the relative permeability curve or physical property characteristics only once, and it is difficult to accurately characterize the effect of the foamy oil phenomenon. The influence of heavy oil solution gas flooding development effect leads to large errors in simulation calculation results, so it cannot be used to simulate the solution gas drive process of heavy oil reservoirs with foamy oil phenomenon

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  • Heavy oil reservoir dissolved gas drive numerical simulation method with bubble oil phenomenon
  • Heavy oil reservoir dissolved gas drive numerical simulation method with bubble oil phenomenon
  • Heavy oil reservoir dissolved gas drive numerical simulation method with bubble oil phenomenon

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Embodiment 1

[0079] This embodiment 1 is to fit the experimental data of one-dimensional heavy oil solution gas flooding with foamy oil phenomenon, to determine the unreliable parameters of the model, and to improve the reliable model parameters for the three-dimensional actual reservoir prediction in embodiment 2. In the experiment, the core length of the sand-filled pipe was selected to be 60 cm, and the cross-sectional area was 20 cm. 2 , the permeability of the model is 1.25D, the porosity is 0.386, and the compressibility coefficient of the rock is 3.2×10 - 3 MPa -1 . The experimental temperature is 25°C, the initial pressure of the model is 4.19MPa, the crude oil bubble point pressure is 3.96MPa, the oil-gas interfacial tension γ=30dyne / cm, the crude oil viscosity, crude oil volume coefficient, and dissolved gas-oil ratio under the bubble point pressure are 1100cp, 1.05, 15.57m 3 / m 3 . The left end of the sand filling pipe is closed, and the right end has a fixed production vo...

Embodiment 2

[0154] A solution gas flooding numerical simulation method for heavy oil reservoirs with foamy oil phenomenon as described in Example 1, the difference is that the reservoir area is 300m×300m, the reservoir thickness is 50m, and a well in the middle of the reservoir is Yield 15m 3 / d production, other parameters adopt the parameters obtained by fitting in embodiment 1. The model grid is divided into 15×15×5, other parameters use the parameters after the experiment fitting in the embodiment 1, and the calculation steps are the same as the embodiment 1.

[0155] The reservoir pressure distribution after simulation calculation is shown in Figure 6a , oil phase saturation distribution see Figure 6b . Depend on Figure 6a It can be seen that due to the production of production wells, from the reservoir boundary to the middle of the reservoir, the reservoir pressure gradually decreases and the decreasing speed becomes faster and faster, presenting a funnel-like decline. Depen...

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Abstract

The invention provides a heavy oil reservoir dissolved gas drive numerical simulation method with a bubble oil phenomenon. The method comprises the following steps: in a microscopic view, establishing a mathematical model for describing a bubble nucleation and growth principle; on the basis, deducing a diffusion speed equation of gas from dissolved gas to bubbles; establishing a three-dimensional two-phase multi-component dissolved gas drive mathematical model; combining a finite difference method and an implicit pressure-explicit saturation (IMPES) method to solve; determining the saturation degree, the dissolved gas-oil ratio, the oil yield and the gas yield of oil reservoir pressure, an oil phase and a gas phase; and then, taking heavy oil reservoir dissolved gas drive experiments with the bubble oil phenomenon as evidences and determining uncertain parameters of the model through an experiment fitting method; and finally, revealing a development effect parameter influence principle through the fitted mode, understanding the bubble oil phenomenon, predicating the productivity of an oil field and formulating a development strategy to improve a heavy oil reservoir recovery ratio with the bubble oil phenomenon.

Description

technical field [0001] The invention relates to a numerical simulation method for dissolved gas drive in heavy oil reservoirs with foamy oil phenomenon, and belongs to the simulation technical field of heavy oil reservoir development. Background technique [0002] Heavy oil resources are very rich in the world, accounting for more than one-third of the total oil and gas resources. my country's proven and controlled reserves are more than 1.9 billion tons, mainly distributed in more than a dozen oil fields such as Liaohe, Xinjiang, and Shengli. In addition, with the internationalization of my country's oil and gas exploration and development, a large number of foreign heavy oil resources need to be developed urgently. Therefore, at a time when conventional oil and gas exploration and development are becoming more and more difficult and energy conflicts are becoming more and more prominent, vigorously developing heavy oil enhanced oil recovery technology is in line with the n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367Y02A10/40
Inventor 孙晓飞张艳玉王士林宋兆尧许凤桐冯金良田丰吴洁方潇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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