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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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; i

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 device and method for measuring the permeability of hydrate-containing sediments under triaxial stress conditions. The measuring device includes a reaction kettle, a pressure control system, a hydrate saturation measurement system and a permeability measurement system. The system can simultaneously apply axial pressure and confining pressure to achieve precise control of axial pressure and confining pressure; the hydrate saturation measurement system uses a flexible time-domain reflection probe to minimize the impact on seepage channels; the permeability measurement system real-time Detect the change of hole pressure, outlet pressure and liquid output, and realize the automatic calculation of sample permeability, which is efficient and accurate, and avoids manual errors. Using this permeability measurement device and its corresponding test method, the permeability simulation experiment of hydrate-containing sediments under triaxial stress conditions can be carried out, and the simulated data of hydrate-containing sediment permeability and saturation under triaxial stress conditions can be obtained. It provides an effective theoretical basis for the law of water production and gas production in the process of depressurization of hydrates.

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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