Dry ice sublimation hole bottom refrigerating and pressure keeping sampler and sampling method

A technology of sampler and dry ice, which is applied in the direction of earth cube drilling, extraction of undisturbed core devices, wellbore/well components, etc., which can solve the problems that the core cannot maintain the initial pressure, is not easy to do, and the sealing performance is reduced, so as to improve the core quality. The recovery rate, easy operation, and the effect of avoiding damage

Inactive Publication Date: 2009-08-26
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the tightness of the ball valve is slightly reduced, the core cannot maintain the initial pressure, resulting in coring failure
And when the design pressure of the sampler

Method used

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  • Dry ice sublimation hole bottom refrigerating and pressure keeping sampler and sampling method
  • Dry ice sublimation hole bottom refrigerating and pressure keeping sampler and sampling method
  • Dry ice sublimation hole bottom refrigerating and pressure keeping sampler and sampling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Suspension differential mechanism: the outer handle 1 is threadedly connected with the upper drill pipe, the outer handle 1 is threaded with the outer hexagonal handle 6, the outer hexagonal handle 6 and the inner hexagonal handle 7 are transmitted through inner and outer hexagonal handles, the inner hexagonal handle 7 and the outer pipe 12 Threaded connection, the stop sleeve 2 is threaded with the outer hexagonal handle 6 through screws, and the stop sleeve 2 restricts the sliding sleeve 5 from sliding outward. Sliding sleeve 5 is slidingly matched with outer hexagonal handle 6. Washer 11 is seated on the step of the inner hole of outer hexagonal handle 6. Sliding sleeve spring 10 is preloaded and installed. The upper and lower ends are respectively supported by washer 11 and sliding sleeve 5. Steel ball 8 is mounted on In the ball sleeve 9, the outer side of the ball sleeve 9 is a tapered surface to prevent the steel ball 8 from sliding outwards. There are 12 steel ba...

Embodiment 2

[0065] Suspension differential mechanism: the outer handle 1 is threadedly connected with the upper drill pipe, the outer handle 1 is threaded with the outer hexagonal handle 6, the outer hexagonal handle 6 and the inner hexagonal handle 7 are transmitted through inner and outer hexagonal handles, the inner hexagonal handle 7 and the outer pipe 12 Threaded connection, the stop sleeve 2 is threaded with the outer hexagonal handle 6 through screws, and the stop sleeve 2 restricts the sliding sleeve 5 from sliding outward. Sliding sleeve 5 is slidingly matched with outer hexagonal handle 6. Washer 11 is seated on the step of the inner hole of outer hexagonal handle 6. Sliding sleeve spring 10 is preloaded and installed. The upper and lower ends are respectively supported by washer 11 and sliding sleeve 5. Steel ball 8 is mounted on In the ball sleeve 9, the outer side of the ball sleeve 9 is a tapered surface to prevent the steel ball 8 from sliding outwards. There are 12 steel ba...

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PUM

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Abstract

The invention relates to a dry ice sublimation hole bottom refrigerating and pressure keeping sampler and a sampling method. The device is mainly composed of a suspension differential action mechanism, a single action mechanism, a control mechanism, a refrigerating mechanism and a pressure keeping mechanism. The method comprises: using dry ice as refrigerant, alcohol as refrigeration assisting catalyst and secondary refrigerant, and applying low temperature alcohol to the hole bottom to refrigerate the rock core; closing a ball valve to keep pressure of the rock sample so as to inhibite the decomposition of the hydrate rock core; dismounting a blocking tube and a drill bit when sampling, dismounting a clamp spring and a clamp spring seat, pulling out a half combining tube and the rock core from the rock core tube, and using a liquid nitrogen holdup vessel or a high pressure container to keep the rock core sample. When drilling for sampling the rock core, the external tube and the drill bit gyre, but the internal tube assembly does not gyre, thus avoiding the damage of mechanical force to the rock core caused by the gyrus of the drilling tool to a larger degree, improving the rock core sampling rate, integrity and representativeness more effectively, and realizing pure refrigeration sampling as well as a combination of refrigeration sampling and rock core pressure keeping; compared with the prior art, the invention has simple process, convenient operation and greatly reduces the cost.

Description

Technical field: [0001] The invention relates to a drilling sampling device, in particular to a sampling device for freezing and maintaining pressure at the bottom of a natural gas hydrate dry ice sublimation hole for seabed or land permafrost preservation and a sampling method. Background technique: [0002] With the advent of the era of high oil prices, it has become a top priority to promote various alternative energy sources. The current total amount of methane carbon in the global seafloor gas hydrates is equivalent to twice the total amount of currently known fossil fuel resources such as coal, oil and natural gas. Therefore, natural gas hydrate has become an important backup energy that must be considered in the balanced development of energy strategies in countries all over the world. Drilling sampling is the most direct method to identify gas hydrates, and it is also a necessary means to verify the investigation results of other methods. Therefore, drilling sampli...

Claims

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Application Information

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IPC IPC(8): E21B25/16E21B49/00E21B34/06
Inventor 孙友宏郭威陈晨张祖培薛军
Owner JILIN UNIV
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