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Method for nuclear magnetic resonance on-line detection of shale gas

A technology of nuclear magnetic resonance and shale gas, which is applied in the direction of electron magnetic resonance/nuclear magnetic resonance detection and nuclear magnetic resonance analysis, etc., and can solve the problem that shale gas nuclear magnetic resonance signals cannot be detected

Active Publication Date: 2015-12-23
PETROCHINA CO LTD
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Problems solved by technology

[0005] However, since the NMR signal of shale gas cannot be detected under normal temperature and pressure conditions, there is currently no online NMR monitoring technology for shale samples.

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  • Method for nuclear magnetic resonance on-line detection of shale gas
  • Method for nuclear magnetic resonance on-line detection of shale gas
  • Method for nuclear magnetic resonance on-line detection of shale gas

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Embodiment Construction

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0027] figure 1 It is a schematic flowchart of the method for online detection of shale gas by nuclear magnetic resonance in an embodiment of the present invention. Such as Figure 4 As shown, the method for online detection of shale gas by nuclear magnetic resonance in the embodiment of the present invention comprises steps:

[0028] S101: Using a high-temperature and high-pressure probe to heat and pressurize the shale sample therein to a set temperature and a set pressure, the set temperature is 150-170°C, and the set pressure is 50-60MPa;

[0029] S102: Under t...

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Abstract

The invention provides a method for nuclear magnetic resonance on-line detection of shale gas. The method comprises steps: a shale sample is heated to a set temperature and pressurized to a set pressure by utilization of a high-temperature and high-pressure probe, the set temperature is 150-170 DEG C, and the set pressure is 50-60MPa; at the set temperature and the set pressure, the shale sample is subjected to nuclear magnetic resonance measurement by utilization of a pulse sequence, and the relaxation time T2 spectrum of the shale sample is obtained through inversion; the adsorbed gas saturability and the free gas saturability of the shale sample are calculated according to the relaxation time T2 spectrum. The detection method can evaluate occurrence of methane well and obtains the adsorbed gas saturability and the free gas saturability rapidly.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to a method for online detection of shale gas by nuclear magnetic resonance. Background technique [0002] Shale gas is a kind of unconventional natural gas stored in shale or mudstone in free and adsorbed state. It is becoming a force to stir the world market and greatly rewrite the world's energy pattern. [0003] At present, the method of analyzing the gas adsorbed by shale is mainly based on the isothermal adsorption experiment of coalbed methane. The method is to place the powdered shale sample in a sealed container, measure the volume of experimental gases such as methane adsorbed when it reaches adsorption equilibrium under the same temperature and different pressure conditions, and then calculate the Langmuir adsorption theory according to the Langmuir adsorption theory. Volume, Rankine pressure, and adsorption isotherms. This method is complex in opera...

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Application Information

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IPC IPC(8): G01N24/08G01V3/14
Inventor 顾兆斌孙威刘卫胡志明于徳海
Owner PETROCHINA CO LTD
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