Title:
STAGED CEMENTING DEVICE AND STAGED CEMENTING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/001102
Kind Code:
A1
Abstract:
Disclosed is a staged cementing device (10), comprising a cylindrical body (100) having an inner cavity (110), wherein a circulation hole (120) and a liquid inlet hole (130) opening towards the inner cavity are provided in a wall of the body; an opening assembly (300) arranged in the body and comprising an opening sleeve (310) and an opening seat (320) arranged in the opening sleeve (310), wherein in an initial state, the opening sleeve (310) is connected to the body (100) by means of a first shear pin (180) and covers the circulation hole (120), and the opening seat (320) is connected to the opening sleeve (310) by means of a second shear pin (182) and covers the liquid inlet hole (130); and a packer (200), comprising a packing valve body (210) and a rubber barrel (220), the packing valve body (210) comprising a flow channel (230) in communication with the liquid inlet hole (130), and the rubber barrel (220) comprising a liquid containing cavity (240) in communication with the flow channel (230). The second shear pin (182) is configured to be sheared off in response to pressure build-up in the inner cavity of the body (100) after first-stage well cementation is finished, such that the opening seat (320) moves downstream to open the liquid inlet hole (130). Therefore, expansion liquid entering the inner cavity of the body (100) during a first-stage well cementation can enter the liquid containing cavity (240) through the liquid inlet hole (130) and the flow channel (230), such that the rubber sleeve (220) is expanded for the first time.
Inventors:
QIN JINLI (CN)
LIU YANG (CN)
CHEN WUJUN (CN)
LIU BEN (CN)
GUO ZHAOHUI (CN)
ZENG YANJUN (CN)
LIU MING (CN)
YANG DEKAI (CN)
ZHU YUJIE (CN)
LIAO HONGQIAN (CN)
LIU YANG (CN)
CHEN WUJUN (CN)
LIU BEN (CN)
GUO ZHAOHUI (CN)
ZENG YANJUN (CN)
LIU MING (CN)
YANG DEKAI (CN)
ZHU YUJIE (CN)
LIAO HONGQIAN (CN)
Application Number:
PCT/CN2021/074711
Publication Date:
January 06, 2022
Filing Date:
February 01, 2021
Export Citation:
Assignee:
CHINA PETROLEUM & CHEM CORP (CN)
SINOPEC RES INST PETROLEUM ENG (CN)
SINOPEC RES INST PETROLEUM ENG (CN)
International Classes:
E21B33/14
Foreign References:
| CN108590574A | 2018-09-28 | |||
| CN103711453A | 2014-04-09 | |||
| CN104234658A | 2014-12-24 | |||
| CN101929318A | 2010-12-29 | |||
| CN107975352A | 2018-05-01 | |||
| RU95108049A | 1997-02-10 |
Attorney, Agent or Firm:
YUHUA UNITED INTELLECTUAL PROPERTY LAW FIRM (CN)
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