Seabed natural gas hydrate production methane leakage in-situ electrical monitoring method and device

A technology for hydrates and natural gas, applied in measuring devices, geophysical measurements, radio wave measurement systems, etc., can solve the problems of gas leakage, small monitoring range, and high cost, and achieve strong early warning, large monitoring range, and low operating costs. low effect

Active Publication Date: 2017-04-26
OCEAN UNIV OF CHINA
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Problems solved by technology

[0005] In order to solve the technical problems that the existing seabed natural gas hydrate monitoring method has high cost, or cannot monitor the gas leakage in the sediment layer, and the monitoring range is relatively small, the present invention proposes an in-situ electrical monitoring method for seabed natural gas hydrate method to solve the above problems

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  • Seabed natural gas hydrate production methane leakage in-situ electrical monitoring method and device
  • Seabed natural gas hydrate production methane leakage in-situ electrical monitoring method and device

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Embodiment 1

[0052] In order to monitor the leakage of methane in the overlying soil layer during hydrate production, the current 4D seismic method requires a large amount of engineering and high cost. Due to the relatively stable conductivity of seabed sediments, the methane produced after the decomposition of natural gas hydrate is in a fluid state. Or the gaseous mode enters the pores of the seabed sediments, and the change of methane content in the seabed sediments directly reflects the change of the electrical conductivity of the seabed sediments. The indirect monitoring of the methane content in the medium can realize large-scale monitoring by laying monitoring cables on the seabed. In addition, the monitoring principle is: after the electric field is established, the potential difference between the two measuring electrodes is affected by the resistivity of the overall area between the two, where Due to the distribution of current density in the sediment layer (traditionally, it is b...

Embodiment 2

[0073] This embodiment is based on the in-situ electrical monitoring method for methane leakage in subsea natural gas hydrate exploitation in Example 1, and proposes an in-situ electrical monitoring device for methane leakage in subsea natural gas hydrate exploitation, such as figure 1 As shown, it includes a monitoring cable 11, a collection station 14, a power module 15, and an upper computer 16 of the master control platform. The monitoring cable 11 is provided with a plurality of electrodes 13, and the monitoring cable 11 is connected to the collection station 14. The collection station 14 is connected to the power supply through wires. Module 15 is connected,

[0074] In the in-situ electrical monitoring of seabed natural gas hydrate, the collection station 14 is used to control the working state of the working electrode on the monitoring cable, select the power supply electrode and the measurement electrode, and control the power supply module to supply power to the power...

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Abstract

The invention discloses a seabed natural gas hydrate production methane leakage in-situ electrical monitoring method. The monitoring method includes the following steps of: laying monitoring cables; carrying out scanning and measurement on the electric potential of a seabed section; calculating the apparent resistivity of the seabed section: an acquisition station calculates the apparent resistivity distribution of the seabed section at each layer is calculated according to the measured electric potential data of each layer of the seabed section; and performing inversion and monitoring: the obtained apparent resistivity data are inversed into resistivity data, the resistivity of each layer of the seabed section is drawn, so that a resistivity profile map is outputted, and methane flow-state leakage or gaseous leakage in seabed sedimentary layers is monitored. The monitoring device comprises monitoring cables, an acquisition station, a power source module and a master control platform upper computer. According to the seabed natural gas hydrate production methane leakage in-situ electrical monitoring method of the present invention, the monitoring cables are just required to be laid for once, and therefore, manpower and material costs can be saved, and operating cost is low; a monitoring range is large; and the sedimentary layers are monitored, and therefore, monitoring advancement and early warning performance are high.

Description

technical field [0001] The invention relates to the monitoring field of subsea natural gas hydrate exploitation, in particular to an in-situ electrical monitoring method and device for methane leakage in subsea natural gas hydrate exploitation. Background technique [0002] The main environmental risks faced by natural gas hydrate mining are the stability of seabed sediments caused by hydrate decomposition and the greenhouse effect caused by the release of large amounts of methane gas. For the stability of seabed sediments, currently the seabed subsidence is monitored mainly through hydraulic pressure measuring devices, instantaneous seismic devices, three-component acceleration sensors, etc.; For the monitoring of reservoir stability, it is usually necessary to deploy distributed temperature sensors DTS and resistance temperature sensors RTD in production wells or monitoring wells to monitor the decomposition state of reservoirs through temperature changes. The 4D seismic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
CPCG01V3/088
Inventor 郭秀军吴景鑫
Owner OCEAN UNIV OF CHINA
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