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Method for simulating and predicting Langmuir volume and Langmuir pressure of natural gas absorption by shale

A technology for adsorbing natural gas and Ransom volume, applied in prediction, data processing applications, instruments, etc., can solve problems such as few influencing factors, insufficient comprehensiveness, affecting model rationality and fitting accuracy, etc.

Inactive Publication Date: 2016-07-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, the influence factors considered by the predecessors are few and not comprehensive enough, which may affect the rationality and fitting accuracy of the model.

Method used

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  • Method for simulating and predicting Langmuir volume and Langmuir pressure of natural gas absorption by shale
  • Method for simulating and predicting Langmuir volume and Langmuir pressure of natural gas absorption by shale
  • Method for simulating and predicting Langmuir volume and Langmuir pressure of natural gas absorption by shale

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[0061] In order to make the purpose, research method and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0062] In this study, 10 continental shale samples from the Songliao and Bohai Bay Basins were selected, and 15 isothermal adsorption experiments were carried out under different temperature conditions. At the same time, the isothermal adsorption experiment data of 17 samples of 9 continental shale in the Ordos Basin were collected. The isothermal adsorption experiment was carried out with a self-developed high-pressure gas isothermal adsorption-desorption instrument. The instrument was installed on a constant temperature oil bath, the temperature error was controlled within ±0.2°C, and the pressure accuracy was 3.51kPa. In ord...

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Abstract

The invention relates to a method for simulating and predicting a Langmuir volume and a Langmuir pressure of natural gas absorption by shale, which belongs to the technical field of gas pressure measurement or volume analysis materials. With the method, defects that a few of influence factors exist, the existing technology is not comprehensive, and the rationality and fitting precision of the model may be affected in the prior art can be solved. The method comprises: a Langmuir model is used for carrying out fitting on an isothermal absorption experiment; before modeling of a Langmuir volume and a Langmuir pressure, influence factors of the Langmuir volume and the Langmuir pressure are determined based on statistic analyses; after determination of all influence factors of the Langmuir volume and the Langmuir pressure, modeling is carried out by the way of weighting on all factors and an integrated prediction model is established; to be specific, the procedure is implemented by the two steps: constructing an objective function and a penalty function and carrying out model simulation and a prediction result analysis. According to the invention, the Langmuir volume and the Langmuir pressure can be simulated and predicted effectively; the work load of the experiment can be reduced; and the method has the positive significance in evaluation of shale resources and workability.

Description

technical field [0001] The invention relates to a method for simulating and predicting the Lange volume and pressure of natural gas adsorbed by shale, and belongs to the technical field of analyzing materials by measuring gas pressure or volume. Background technique [0002] The adsorption phase is one of the main occurrence phases of shale gas, and the Langmuir model is a classic model to describe the adsorption characteristics of shale gas. The Langmuir isotherm adsorption model is an equilibrium single-layer adsorption model, in which the Range volume represents the maximum adsorption capacity of the sample; the Range pressure is the corresponding pressure when the adsorption capacity is equal to half the Range volume. The Rankine volume and the Rankine pressure determine the productivity curve and recovery factor of shale gas to a large extent, because a large Rankine volume means that shale has a strong adsorption capacity, and a high Rankine pressure indicates that sha...

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Application Information

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IPC IPC(8): G06Q10/04G06F17/50G06F17/11
CPCG06F17/11G06F30/367G06Q10/04
Inventor 李吉君马妍黄开展卢双舫阴建新张亚念
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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