Natural gas hydrate hammer type freezing and pressure-holding double-acting rope sampling drilling tool and method
A hydrate and natural gas technology, which is applied in the direction of earthwork drilling and extracting undisturbed core devices, etc., can solve the problems of core acoustic wave and resistivity and other test data changes, change the basic physical properties of natural gas hydrate cores, etc., to improve the success of coring rate effect
Active Publication Date: 2020-06-12
JILIN UNIV
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However, using this method will change the original basic physical properties of the gas hydrate core, resulting in changes in the test data of the core such as acoustic wave and resistivity.
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[0026] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. It should be understood by those skilled in the art. The content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention. In order to avoid obscuring the essence of the present invention, well-known methods, procedures, procedures and components have not been described in detail.
[0027] The invention combines hammer-type vibration sampling, pressure-holding sampling and freezing sampling to realize the purpose of increasing the core-taking rate of natural gas hydrate cores in non-lithological deposits.
[0028] The present invention adopts low-temperature phase-change liquid as a cold source, and the low-temperature phase-change liquid adopts alcohol-dry ice mixture with a temperature of 0°C to -120°C, aceton...
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The invention relates to a natural gas hydrate hammering type freezing pressure maintaining double-acting rope sampling drilling-tool and method. The sampling drilling-tool comprises a fishing device,an outer pipe of the drilling tool, an inner pipe assembly of the drilling tool and a drill bit, and the inner pipe assembly of the drilling tool comprises a hammering type vibration sampling mechanism, a phase change refrigeration mechanism, a pressure maintaining mechanism and a drilling coring mechanism. The integrity of natural gas hydrate cores is ensured by adopting hammering type vibrationsampling technology. The stability of the natural gas hydrate cores is ensured by adopting heat preservation and pressure maintaining sampling technology. Freezing sampling technology is used for assisting the heat preservation and pressure maintaining sampling technology. When the pressure maintaining fails, the natural gas hydrate cores are frozen to -40 DEG C through the phase-change heat absorption effect of low-temperature phase-change liquid to ensure that the natural gas hydrate does not decompose. Based on the technology, the natural gas hydrate hammering type freezing pressure maintaining double-acting rope sampling drilling-tool and method can improve the coring success rate of the non-lithologic sediment natural gas hydrate.
Description
technical field [0001] The invention relates to a natural gas hydrate hammer type freezing and pressure-preserving double-action cable sampling drilling tool and a method, which are especially suitable for the field of natural gas hydrate drilling and coring in non-lithological deposits. Background technique [0002] my country's conventional oil and gas resources are far from meeting the needs of economic and social development. Natural gas hydrates mainly occur on the continental margins of the world's oceans and high-latitude permafrost zones, and have the characteristics of high energy density, wide distribution, large scale, and shallow burial, and the natural gas produced can meet the requirements of energy, economy, and environment. A new type of clean energy with commercial development prospects. Natural gas hydrate can only exist under certain temperature and pressure conditions. Generally, the temperature is required to be lower than 0°C to 10°C, and the pressure ...
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IPC IPC(8): E21B25/08E21B25/10E21B25/18
CPCE21B25/08E21B25/10E21B25/18
Inventor 王元郭威孙友宏张鹏宇杨翔
Owner JILIN UNIV