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Home > Archive>Volume 48, Issue S1, 2021 >290-295. DOI:10.12143/j.ztgc.2021.S1.049
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New technology and experimental research on water jet crushing combined with CO2 replacement to exploit natural gas hydrate
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Affiliation:

1.College of Construction Engineering, Jilin University, Changchun Jilin 130026, China;2.Key Laboratory of Drilling and Exploitation Technology in Complex Conditions of Ministry of Natural Resources, Changchun Jilin 130026, China

Clc Number:

P634;P744.4

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    Abstract:

    The five current methods of mining natural gas hydrates are summarized with focus on the analysis of CO2 replacement mining and solid mining methods， and by analyzing the advantages and disadvantages of the two mining methods， a new approach， by which water jets erodes and breaks ocean gas hydrates in combination with CO2 replacement， is proposed for the exploitation of natural gas hydrates， The mined-out area formed by erosion and breaking of water jets in the hydrate reservoir can provide better storage space for CO2， increase its interaction area with the reservoir， and improve the replacement efficiency. The stored CO2 hydrate can also increase the stability of the hydrate reservoir， providing good complementary effect. The experimental results show that during the entire replacement process， the CH4 replacement rate in the reservoir containing the mined-out area is 24.3%， and the CO2 storage rate is 22.1%； while the CH4 replacement rate in the intact reservoir is 15.3%， and the CO2 storage rate is 20.9%； indicating that the replacement rate increases about 59%， the storage rate increases about 5.7%. The function of the goaf is mainly reflected in increasing the injection volume of the hydrate replacement medium.

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History
  • Received:May 27,2021
  • Revised:May 27,2021
  • Adopted:July 17,2021
  • Online: December 06,2021
  • Published: September 01,2021
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