Petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device

A technology of carbon dioxide and prediction methods, which is applied in earth-moving drilling, special data processing applications, and production of fluids, etc., can solve the problems of difficult component data, prediction of minimum miscible pressure of carbon dioxide flooding reservoirs, lack of empirical formulas, etc. Quick and easy predictions

Active Publication Date: 2016-03-16
PETROCHINA CO LTD
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Problems solved by technology

[0004] The embodiment of the present invention provides a method and device for predicting the miscible pressure of a carbon dioxide flooding reservoir to solve the difficulty in obtaining the molecular weight and component data of crude oil in

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  • Petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device
  • Petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device
  • Petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device

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Embodiment Construction

[0065] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0066] Such as figure 1 As shown, a method for predicting the miscible pressure of a carbon dioxide flooding reservoir provided by an embodiment of the present invention includes:

[0067] Step 101. Obtain basic parameters for predicting the miscible pressure of the carbon dioxide flooding reservoir.

[0068] The basic parameters include: reservoir temperature, reservoir original formation pressure, and crude oil viscosity at current reservoir conditions.

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Abstract

The invention provides a petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device and relates to the technical field of petroleum reservoir exploitation. The method includes the steps that the basic parameters for predicting petroleum reservoir carbon dioxide miscible flooding pressure are obtained; the solubility parameter of petroleum is determined; petroleum reservoir initial reservoir pressure serves as the trial pressure value, the current trial pressure value and the carbon dioxide density at the petroleum reservoir temperature are determined, and the solubility parameter of the carbon dioxide is determined; the absolute value of the difference of the solubility parameter of the petroleum and the solubility parameter of the carbon dioxide is determined; if the error of the absolute value of the difference and the preset threshold value is smaller than the preset error value, the trial pressure value serves as the minimum petroleum reservoir carbon dioxide miscible flooding pressure; and if the error is larger than or equal to the preset error value, the trial pressure value is adjusted, the updated trial pressure value is formed, the current trial pressure value and the density of the carbon dioxide at the petroleum reservoir temperature are re-determined, and the solubility parameter of the carbon dioxide is re-determined till the error is smaller than the preset error value.

Description

technical field [0001] The invention relates to the technical field of reservoir development, in particular to a method and device for predicting the miscible pressure of a carbon dioxide flooding reservoir. Background technique [0002] Currently, in carbon dioxide (CO 2 ) flooding reservoir development process, since the oil displacement efficiency of miscible flooding is better than that of immiscible flooding, the determination of the minimum miscible pressure becomes the key basic parameter for the evaluation of development effect. At present, experimental measurement is the main means to accurately obtain the minimum miscibility pressure of carbon dioxide flooding, but the process of experimental measurement is complicated and time-consuming, and this method is not applicable in the stage of reservoir screening or potential evaluation. [0003] Aiming at this problem, some empirical formulas have been proposed in the prior art to predict the minimum miscibility pressu...

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Application Information

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IPC IPC(8): E21B43/16G06F17/50
Inventor 周体尧杨思玉杨永智张曙光宫伟高建
Owner PETROCHINA CO LTD
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