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Permeability measuring device and method of hydrate-contained sediments under three-axis stress conditions

A triaxial stress and hydrate-containing technology, which is applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve problems such as high cost, large error, and complicated process

Pending Publication Date: 2018-04-10
QINGDAO INST OF MARINE GEOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the invention patent with the application publication number [CN107202736A] discloses a multifunctional hydrate characteristic experimental device, but its confining pressure control system can only simulate the permeability experiment under certain confining pressure conditions, and an additional loading system is required when axial pressure is applied. , and the confining pressure and axial pressure are difficult to maintain synchronous application, whether the simulation results are consistent with the actual permeability results of hydrate-bearing formations needs to be further studied; in addition, the invention patent application publication number [CN102445371B] discloses a hydrate sediment The integrated device for in-situ generation, decomposition and permeability measurement requires another triaxial testing machine for mechanical property test research, which is complicated and costly; at present, the change law of permeability of hydrate sediment layer under triaxial stress conditions It is not clear yet, moreover, when the above device calculates the hydrate saturation and permeability, it needs to manually read and select the relevant parameters, and the error is relatively large

Method used

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  • Permeability measuring device and method of hydrate-contained sediments under three-axis stress conditions
  • Permeability measuring device and method of hydrate-contained sediments under three-axis stress conditions
  • Permeability measuring device and method of hydrate-contained sediments under three-axis stress conditions

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Embodiment 1

[0050] Example 1, a device for measuring the permeability of hydrate-containing sediments under triaxial stress conditions, refer to figure 1 , including a reactor, a leak detection system connected to the reactor, a temperature control system, a pressure control system, a hydrate sample preparation system, a hydrate saturation measurement system, and a permeability measurement system. In order to facilitate sample loading and subsequent disassembly of the reactor, It also includes special tooling for the reactor, in which the pressure control system, hydrate saturation measurement system and permeability measurement system are all connected to the computer. The reactor is used to simulate the temperature, pressure and other parameters of the hydrate reservoir. The temperature control system provides the reactor with the temperature required for the simulation experiment. The axial pressure and the confining pressure are applied synchronously by connecting the pressure control ...

Embodiment 2

[0060] Embodiment 2, based on the permeability measurement device proposed in Embodiment 1, this embodiment proposes a method for measuring the permeability of hydrate-containing sediments under triaxial stress conditions, including the following steps:

[0061] (1) Check the air tightness of the device;

[0062] Before the installation of sample 1, replace the experimental sample with a special φ39.1×80mm rubber sample, install the reaction kettle, inject a pressure of 10MPa into the kettle body, check whether the pressure leaks, check whether the sealing rings and vulnerable parts are intact, the key points Check the dynamic seal between the piston cylinder 22 and the reaction kettle cavity 26, and the standard for judging that each sealing point is leak-proof is that the internal pressure of the kettle body remains constant for more than 10 hours. Check the airtightness by pumping a certain amount of pressure to the whole device through the air pump 7. The standard of good ...

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Abstract

The invention discloses a permeability measuring device and method of hydrate-contained sediments under three-axis stress conditions. The measuring device comprises a reaction kettle, a pressure control system, a hydrate saturability measuring system, a permeability measuring system and the like. The pressure control system can synchronously exert axial pressure and peripheral pressure so as to precisely control the axial pressure and the peripheral pressure. The hydrate saturability measuring system reduces the influences on permeation channels to the maximum extent through a flexible time-domain reflection probe. The permeability measuring system detects the pressure variation and liquid outlet volume variation of a pore pressure inlet and outlet in real time so as to automatically obtaining the permeability of samples efficiently and accurately, and artificial errors are avoided. By means of the permeability measuring device and the corresponding measuring method, the permeability simulating experiment of the hydrate-contained sediments under the three-axis stress conditions can be carried out, the simulation data of permeability and saturability of the hydrate-contained sediments under the three-axis stress conditions is obtained, and an effective theoretical basis is provided for the water production and gas production rules of the hydrate depressurizing production process.

Description

technical field [0001] The invention relates to the technical field of basic physical property measurement of unconventional oil and gas reservoir engineering and geotechnical engineering, in particular to a device and method for measuring the permeability of hydrate-containing sediments under triaxial stress conditions. Background technique [0002] Natural gas hydrate is a new type of energy stored in terrestrial permafrost areas and deep sea environments. It has the characteristics of huge reserves, high energy density, clean and pollution-free, and is known as one of the most promising alternative energy sources in the 21st century. In recent years, the exploration and development of natural gas hydrate has gradually been highly valued by various countries. The active development and utilization of natural gas hydrate is of great significance for alleviating energy supply, adjusting energy structure and reducing air pollution. In 2017, the trial mining of hydrate in the ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 张准刘昌岭刘乐乐宁伏龙
Owner QINGDAO INST OF MARINE GEOLOGY
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