Natural gas hydrate reservoir reserve accounting method based on material energy balance principle

A material energy, balance principle technology, applied in the field of natural gas hydrate reserve accounting, can solve complex phase transition and mass transfer and heat transfer process and other problems, to achieve the effect of simple calculation, strong operability, and clear physical meaning

Pending Publication Date: 2022-03-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

The development of natural gas hydrate reservoirs involves complex phase transition and mass and heat transfer processes, and the material balance method used in the conventional oil and gas field is no longer applicable

Method used

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  • Natural gas hydrate reservoir reserve accounting method based on material energy balance principle
  • Natural gas hydrate reservoir reserve accounting method based on material energy balance principle
  • Natural gas hydrate reservoir reserve accounting method based on material energy balance principle

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Embodiment

[0065] Assuming that the initial temperature of the gas hydrate reservoir is 14°C, the initial pressure is 13MPa, and the porosity is 0.41, the reservoir is composed of hydrate and water, in which the original hydrate saturation is 0.438, the initial water saturation is 0.562, and the rock compressibility coefficient 2×10 -3 1 / MPa, the heat capacity of rock is 2.12×10 6 J / m 3 / °C, the thermal conductivity of rock is 3.92J / m / s / °C, a production well is developed by depressurization, figure 2 , image 3 and Figure 4 They are the monitoring curves of gas production, water production and output temperature, respectively.

[0066] Assuming that the hydrate decomposition rate is 20%, according to the material balance equation and the hydrate decomposition rate, the original hydrate reserves can be calculated as 635859m 3 , according to the obtained hydrate original reserves and the principle of energy conservation, the total decomposition heat of hydrate is 7.47×10 13 J. Acco...

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Abstract

The invention discloses a natural gas hydrate reservoir reserve accounting method based on a substance energy balance principle. The natural gas hydrate reservoir reserve accounting method comprises the following steps: 1) collecting basic geological parameters and development parameters of a natural gas hydrate reservoir; 2) assuming the decomposition rate of the hydrate and calculating the original reserves of the hydrate according to a material balance equation; 3) calculating the total decomposition enthalpy of the hydrate according to the obtained original reserves of the hydrate and an energy conservation principle; 4) obtaining the decomposition rate of the new hydrate according to the decomposition kinetics of the hydrate; and 5) judging whether the decomposition rate of the hydrate and the assumed decomposition rate meet error requirements or not, and if not, performing iterative calculation by adopting the decomposition rate obtained by calculation until the error requirements are met. The method combines a material balance equation, an energy conservation principle and hydrate decomposition dynamics to calculate the original reserves of the natural gas hydrate reservoir, has the characteristics of high calculation speed and high practicability, and can provide technical support for reasonable development of the natural gas hydrate reservoir.

Description

technical field [0001] The invention relates to a method for calculating reserves of natural gas hydrate reservoirs based on the principle of material-energy balance, and belongs to the technical field of natural gas hydrate reservoir development. Background technique [0002] At present, the total resources of natural gas hydrate in my country's sea area exceed 80 billion tons of oil equivalent, which is about twice the amount of conventional natural gas resources, and it is regarded as a replacement resource in the "post-petroleum era". In 2017 and 2020, my country successfully carried out two gas hydrate test productions in the Shenhu area of ​​the South China Sea, becoming the fourth country with hydrate test production capacity after Canada, the United States and Japan. Utilizing the technical reserves provided, the historical leap from "following" to "leading" in this field has been realized. [0003] In the field of conventional oil and gas, the volumetric method, num...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/30G16C10/00G06F30/20G06F113/08G06F119/08G06F119/14
CPCG16C20/30G16C10/00G06F30/20G06F2113/08G06F2119/14G06F2119/08
Inventor 侯健刘永革杨骏儒李果赵二猛杜庆军周康韦贝
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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