BALL-THROWING SLIDING SLEEVE HAVING REMOVABLE BALL SEAT - CNPC XIBU DRILLING ENG COMPANY LTD

Title:

BALL-THROWING SLIDING SLEEVE HAVING REMOVABLE BALL SEAT

Document Type and Number:

WIPO Patent Application WO/2016/161904

Kind Code:

A1

Abstract:

A ball-throwing sliding sleeve having a removable ball seat comprises an outer sleeve (1), an inner sliding sleeve (6) and a removable ball seat assembly. An upper end of the outer sleeve (1) is provided with an inner annular platform (2) thereon, and a lower end of the outer sleeve (1) is fixedly installed with a lower connecting head (3) therein. The outer sleeve (1) between the inner annular platform (2) and the lower connecting head (3) is formed with a sliding groove (4) therein. A periphery of the outer sleeve (1) at an upper side of the sliding groove (4) is distributed with at least one fracturing side hole (5). The sliding sleeve has a reasonable and compact structure, and is convenient to use. A connecting sleeve (10), a ball seat sleeve (7) and a ball seat (15) can be extracted from the inner sliding sleeve (6) by using a continuous oil pipe, and the width of an inner channel of the sliding sleeve can be increased without being limited by the inner diameter of the ball seat (15), thus facilitating subsequent processes of complex conditions. A pressure release channel formed by a pressure release hole (18) on the ball seat (15) and a ball seat annular groove (17) releases the pressure and is convenient to be lifted up.

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Inventors:

ZHANG SHENGPENG (CN)
LI XIAOJUN (CN)
GAO FEI (CN)
WANG FEIYUE (CN)
ZHANG XIN (CN)
LI FUQIANG (CN)

Application Number:

PCT/CN2016/077368

Publication Date:

October 13, 2016

Filing Date:

March 25, 2016

Export Citation:

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Assignee:

CNPC XIBU DRILLING ENG COMPANY LTD (CN)

International Classes:

E21B34/06; E21B33/12

Foreign References:

CN104790909A	2015-07-22
CN204571931U	2015-08-19
CN103089227A	2013-05-08
CN103821488A	2014-05-28
US3799268A	1974-03-26
US4640351A	1987-02-03
CN203603869U	2014-05-21

Attorney, Agent or Firm:

BEIJING SANYOU INTELLECTUAL PROPERTY AGENCY LTD. (CN)
北京三友知识产权代理有限公司 (CN)

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