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Seabed shallow-layer gas detection method based on MIP-CPT technology

A technology of MIP-CPT and detection method, which is applied in the field of seabed exploration, can solve problems such as high cost, cumbersome construction, and unsatisfactory formation information, and achieve the effects of high safety, reduced operation complexity, and outstanding advantages of data integration

Inactive Publication Date: 2016-02-24
SECOND INST OF OCEANOGRAPHY MNR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Offshore drilling is not only cumbersome and costly, but also because the existing technology is difficult to achieve continuous and fidelity sampling, the formation information obtained by sampling is not ideal

Method used

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  • Seabed shallow-layer gas detection method based on MIP-CPT technology
  • Seabed shallow-layer gas detection method based on MIP-CPT technology
  • Seabed shallow-layer gas detection method based on MIP-CPT technology

Examples

Experimental program
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Effect test

Embodiment 1

[0055] A method for detecting seabed shallow gas based on MIP-CPT technology, comprising the steps of:

[0056] S1. The MIP-CPT underwater unit is lowered from the mother ship and placed on the seabed;

[0057] S2. The MIP-CPT combination probe formed by attaching the MIP module to the CPTU probe penetrates into the seabed with the drill pipe;

[0058] S3. Continuously measure CPTU data, CPTU data includes cone end resistance, side friction resistance, pore water pressure, conductivity;

[0059] S4. During the penetration process, after the organic matter in the formation is continuously thermally decomposed by the MIP module, it is carried to the gas chromatograph by the inert gas along the capillary in the armored cable;

[0060] S5. Photoionization detectors, flame ionization detectors, and dry-type electrolytic conductivity detectors continuously detect the organic substances delivered;

[0061] S6. After the test is over, the drill pipe is raised, and the underwater uni...

Embodiment 2

[0087] This embodiment is similar to Embodiment 1, except that the MIP-CPT combination probe also includes a sampling port 1 through which water samples or gas can be collected during the penetration process.

[0088] Based on the MIP-CPT test data obtained on site, the present invention identifies the free shallow gas and dissolved methane within 30 meters below the seabed in the Zhoushan sea area of ​​the East China Sea, and the results generally conform to the conclusions obtained from the previous geophysical survey. After further analysis of the MIP-CPT data, it is concluded that the shallow gas in the test sea area mainly comes from deeper formations, and the circumstantial evidence of multi-channel seismic exploration results has been obtained. Therefore, the MIP-CPT technology that combines the advantages of drilling and geophysical exploration It has broad application prospects in shallow seabed gas detection.

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Abstract

The invention relates to a seabed shallow-layer gas detection method based on the MIP-CPT technology. According to the invention, a conventional CPTU probe is additionally provided with an MIP module, thereby enabling organic matters in a ground layer to be continuously decomposed along with the probe and to be diffused through a semi-permeable MIP film during exploration operation when CPTU data is obtained. Then, the organic matters are conveyed to a gas chromatograph on a mother ship, and are detected by a photo ionization detector, a flame ionization detector and a dry-type electrolysis electrical conductivity detector in the gas chromatograph. Testing parameters are obtained through analysis, and the phase state and content condition of organic matters in the ground layer are obtained.

Description

technical field [0001] The invention relates to the field of seabed exploration, in particular to a seabed shallow gas detection method based on MIP-CPT technology. Background technique [0002] Submarine shallow gas usually refers to the gas accumulated in the sediment within 1000m below the seabed surface. With the rising ocean development activities, the seabed soil layer containing shallow gas often has a serious impact on foundation engineering construction, and even threatens the safety of submarine oil and gas pipelines. On the other hand, because shallow gas is rich in methane , is widely distributed, and has a history of economic utilization since the excavation of salt wells in my country. It is a precious clean energy source. Therefore, the development of submarine shallow gas detection technology is of great significance to the safety of marine engineering and my country's energy security. At present, the suspected shallow gas-bearing formations are qualitatively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00
CPCG01V9/007
Inventor 来向华陈中轩苟铮慷张恒
Owner SECOND INST OF OCEANOGRAPHY MNR
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