Title:
RUBBER CYLINDER HAVING HIGHER STIFFNESS IN UPPER END PORTION, PACKER, AND BRIDGE PLUG
Document Type and Number:
WIPO Patent Application WO/2017/198121
Kind Code:
A1
Abstract:
Provided is a rubber cylinder (10). An upper end portion (104) of the rubber cylinder (10) has higher stiffness than a middle portion (106) thereof, such that when the upper end portion (104) is under a first axial stress, radial deformation of the middle portion (106) is greater than radial deformation of the upper end portion (104). Also provided are a packer and bridge plug having the rubber cylinder. The upper end portion of the rubber cylinder has greater stiffness than the middle portion, such that when the upper end portion is under the first axial stress, the upper end portion transfers more of the first axial stress to the middle portion and a lower end portion rather than reacting with radial deformation of itself. In this way, a small first axial stress can be employed to create radial deformation of a middle portion and a lower end portion, thus achieving seal of the entire rubber cylinder.
Inventors:
SONG WEI (CN)
LONG XUEWU (CN)
LONG XUEWU (CN)
Application Number:
PCT/CN2017/084210
Publication Date:
November 23, 2017
Filing Date:
May 12, 2017
Export Citation:
Assignee:
TIANDING SEALING TECH (BEIJING)CO LTD (CN)
International Classes:
E21B33/128; E21B33/122; E21B33/134
Foreign References:
| CN104389546A | 2015-03-04 | |||
| CN105545244A | 2016-05-04 | |||
| CN2599219Y | 2004-01-14 | |||
| CN202970610U | 2013-06-05 | |||
| CN2557691Y | 2003-06-25 | |||
| CN201730586U | 2011-02-02 | |||
| CN105863552A | 2016-08-17 | |||
| CN205714080U | 2016-11-23 | |||
| CN105781482A | 2016-07-20 | |||
| CN205778712U | 2016-12-07 |
Attorney, Agent or Firm:
WISEAST INTELLECTUAL PROPERTY LAW FIRM (CN)
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