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Natural gas hydrate stratum internal reinforcement evaluation device and method

A technology for evaluating devices and hydrates, applied in measurement devices, analyzing solids using sonic/ultrasonic/infrasonic waves, and using sonic/ultrasonic/infrasonic waves for material analysis, etc. Accurate experimental results

Inactive Publication Date: 2021-09-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the current experience of international natural gas hydrate test production, it can be seen that hydrate development cannot be carried out in a safe, long-term, and stable industrialized manner like conventional oil and gas, and a lot of research on improving formation stability is still needed. It is necessary to provide an evaluation device for the effect of hydrate formation reformation and solidification

Method used

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  • Natural gas hydrate stratum internal reinforcement evaluation device and method
  • Natural gas hydrate stratum internal reinforcement evaluation device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] An intra-layer reinforcement evaluation device for natural gas hydrate formations, the device includes a core support module, an ultrasonic testing module and a pressure monitoring module.

[0032] The core holding module includes a base, a rock core sample placement table, a core splint and a splint holder; a guide rail is provided on the base, and a guide rail groove is provided in the guide rail; the rock core sample placement table is slidingly connected to the guide rail groove ; The core splint includes a left splint and a right splint, the left splint is fixed on the base, the left splint is provided with a pressure oscilloscope probe placement hole and a transducer probe placement hole, the right splint is slidingly connected with the guide rail groove, and there is a switch on it. There is a hole for placing the energy probe; one side of the right splint is provided with a splint fixer, and the splint fixer is provided with a positioning device, and the splint f...

Embodiment 2

[0039]The intra-layer reinforcement evaluation method of natural gas hydrate formations adopts the intra-layer reinforcement evaluation device of natural gas hydrate formations described in Example 1, conducts ultrasonic velocity tests on the formations before and after curing, and establishes the correlation between formation characteristics, ultrasonic frequency and ultrasonic wave velocity , the specific steps are:

[0040] (1) Turn on the power of the ultrasonic tester, place one end of a group of transducers on the transmitting group column and the receiving group column respectively, and place the other ends on the transducer probe placement holes on the left splint and right splint respectively, fix and apply Vaseline, while placing the pressure oscilloscope probe on the left splint;

[0041] (2) According to the shape of the core sample, select the top of the core sample placement platform suitable for stabilizing the core sample, place the core sample in the middle of...

Embodiment 3

[0048] (1) Use the silty clay 5m below the ground in the Jinshatan area of ​​Qingdao as the solidification object, air-dry it naturally, and then dry it in an oven at 60°C, grind and sieve, and retain 50-80 mesh particles as the soil for the experiment;

[0049] (2) The mass ratio of each component of the weakly cemented natural gas hydrate reservoir skeleton is: Jinshatan soil 4000g, experimental soil 1000g, water 800ml. Stir and mix evenly, pour into the core mold, apply a certain pressure, and prepare the rock samples of the experimental group and the control group;

[0050] (3) Take out the rock sample, place it in an oven, and take it out after drying;

[0051] (4) Put the rock sample in the natural gas hydrate triaxial reactor, and control the hydrate saturation by quantifying water and excess methane gas to form a 500mm high natural gas hydrate rock sample;

[0052] (5) The rock core of the control group is subjected to the ultrasonic test described in Example 2;

[0...

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Abstract

The invention relates to a natural gas hydrate stratum internal reinforcement evaluation device and method. The device comprises a rock core clamping module, an ultrasonic testing module and a pressure monitoring module. The rock core clamping module comprises a base, a guide rail is arranged on the base, and a guide rail groove is formed in the guide rail; a rock core sample placing table is in sliding connection with the guide rail groove; a core clamping plate comprises a left clamping plate and a right clamping plate, a pressure oscilloscope probe placing hole and a transducer probe placing hole are formed in the left clamping plate, the right clamping plate is in sliding connection with the guide rail groove, and a transducer probe placing hole is formed in the right clamping plate; a clamping plate fixer is arranged on one side of the right clamping plate, a positioning device is arranged on the clamping plate fixer, and the clamping plate fixer is in sliding connection with the guide rail groove. According to the method, the incidence relation among the ultrasonic speed, the ultrasonic frequency and the stratum physical property parameters is established in an ultrasonic testing mode, the hydrate stratum solidification effect is defined, and the method has important guiding significance on safety and high efficiency of hydrate stratum transformation and development.

Description

technical field [0001] The invention relates to a reinforcement evaluation device and method for a natural gas hydrate stratum, and belongs to the field of reservoir transformation in natural gas hydrate exploitation engineering. Background technique [0002] Natural gas hydrate is a kind of energy source with extremely high potential, which has been widely concerned by many countries around the world. With the continuous emergence of a large number of research results, the development of hydrate has also made breakthrough progress. The mining method of hydrate Diversification mainly consists of depressurization method, heat injection method, chemical reagent injection method and carbon dioxide replacement method, among which depressurization method is widely used and effective in hydrate mining. However, the hydrate formation in the deep water and shallow layer is complex, the formation is shallowly buried, the lithology is relatively loose, and the clay minerals have high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07G01N29/12G01N29/22
CPCG01N29/07G01N29/12G01N29/223
Inventor 步玉环林栋柳华杰郭胜来路畅郭辛阳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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