Title:
METHOD OF LIMITED SAND CONTROL IN MULTIPLE BRANCH HOLES UTILIZED IN MINING OF NATURAL GAS HYDRATES FROM MARINE SAND RESERVOIR LAYER
Document Type and Number:
WIPO Patent Application WO/2018/090890
Kind Code:
A1
Abstract:
The invention relates to the field of marine natural gas hydrate resource development engineering, and specifically, to a method of limited sand control in multiple branch holes utilized in the mining of natural gas hydrates from a marine sand reservoir layer. The method comprises the following steps: (1) drilling a main wellbore, and completing a well by using a reserved branch hole casing pipe; (2) drilling a plurality of branch holes evenly distributed around the main wellbore, and arranged in a fixed angle with respect to the main wellbore and along a fixed direction; (3) filling, in the periphery of a main wellbore sleeve and the plurality of branch holes, gravel layers, to perform limited sand control; and (4) performing a reverse cleanout, initiating production, and performing a multi-stage pressure reduction. The method is utilized to overcome the inherent weakness of a shallow hydrate reservoir layer of being unsuitable for fracturing modification, effectively resolving issues of low permeability, low combined ground strength, and a high sand production tendency encountered when mining natural gas hydrate reservoir layers in the South China Sea, providing an important basis for increasing continuous hydrate mining periods, and facilitating development of commercial hydrates mining technology.
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Inventors:
WU NENGYOU (CN)
LI YANLONG (CN)
HU GAOWEI (CN)
LIU CHANGLING (CN)
CHEN QIANG (CN)
LI YANLONG (CN)
HU GAOWEI (CN)
LIU CHANGLING (CN)
CHEN QIANG (CN)
Application Number:
PCT/CN2017/110790
Publication Date:
May 24, 2018
Filing Date:
November 14, 2017
Export Citation:
Assignee:
QINGDAO INST MARINE GEOLOGY (CN)
International Classes:
E21B43/01; E21B43/04
Foreign References:
| CN105781499A | 2016-07-20 | |||
| CN104806205A | 2015-07-29 | |||
| CN106761587A | 2017-05-31 | |||
| CN105041271A | 2015-11-11 | |||
| CN105298463A | 2016-02-03 | |||
| RU2250365C2 | 2005-04-20 | |||
| US20120193103A1 | 2012-08-02 |
Attorney, Agent or Firm:
QINGDAO ZHONGTIANHUI INTELLECTUAL PROPERTY AGENCY CO. LTD (CN)
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