Title:
MINING METHOD OF I-TYPE HYDRATE SYSTEM BASED ON RECIPROCATING DISPLACEMENT BETWEEN HOT SEA WATER AND GRAVEL
Document Type and Number:
Japanese Patent JP2020094483
Kind Code:
A
Abstract:
To provide a method for mining a I-type hydrate system on the basis of hot sea water reciprocation and gravel displacement which is suitable for mining massive-type hydrate of shallow part stratum in the sea, in order to realize a safe and continuous mining of massive-type hydrate of shallow part stratum.SOLUTION: In an embedded layer of a I-type hydrate system containing massive-type hydrate of shallow part stratum, a method for drilling a main well and plural sub wells is applied including drilling the main well penetrating a hydrate layer and a free gas layer, boring the free gas layer, and mining lower-part free gas under reduced pressure. The method causes the massive-type hydrate to be decomposed gradually while expanding a decomposition surface area of the massive-type hydrate. By intermittently injecting constant-grain-size gravel to the stratum, a void space of the stratum generated due to decomposition of the massive-type hydrate is continuously filled, permeability around the well increases while maintaining stability of the stratum, and thereby realizing continuous and large mining for natural gas hydrate.SELECTED DRAWING: Figure 1
Inventors:
WU NENGYOU
LIU CHANGLING
LI YANLONG
HU GAOWEI
CHEN QIANG
WAN YIZHAO
SUN JIANYSE
LIU CHANGLING
LI YANLONG
HU GAOWEI
CHEN QIANG
WAN YIZHAO
SUN JIANYSE
Application Number:
JP2019223624A
Publication Date:
June 18, 2020
Filing Date:
December 11, 2019
Export Citation:
Assignee:
QINGDAO INST MARINE GEOLOGY
International Classes:
E21B43/00
Domestic Patent References:
| JP2009030378A | 2009-02-12 | |||
| JP2005083134A | 2005-03-31 | |||
| JP2003214082A | 2003-07-30 | |||
| JPH09158662A | 1997-06-17 |
Foreign References:
| WO2007023943A1 | 2007-03-01 | |||
| CN101666286A | 2010-03-10 |
Attorney, Agent or Firm:
Hiroe Associates Patent Office