Core barrel sealing structure capable of increasing sealing-specific pressure

Patent metadata

Field	Value
Publication number	US-11761283-B2
Application number	US-201817309231-A
Country	US
Kind code	B2
Filing date	Nov 12, 2018
Priority date	Nov 8, 2018
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

A core barrel sealing structure includes a core barrel, a drilling machine outer barrel, a chain mail-type flap valve and a trigger mechanism. The flap valve includes a valve seat and a chain mail-type valve flap. The trigger mechanism includes a trigger inner barrel and a trigger block. The trigger block is arranged in a through hole in a sidewall of the trigger inner barrel, and an inner wall of the drilling machine outer barrel is provided with a recessed opening adapted to the trigger block. When the core barrel is located in the valve seat, the valve flap is opened by 90° and is located between the trigger inner barrel and the drilling machine outer barrel. When the core barrel is lifted upwards, the valve flap returns to a top face of the valve seat to make sealing contact with a sealing face of a valve opening.

First claim

The invention claimed is:

1. A core barrel sealing structure comprising a core barrel, a drilling machine outer barrel, a chain mail-type flap valve, and a trigger mechanism; the chain mail-type flap valve includes a valve seat and a chain mail-type valve flap, wherein the valve seat is coaxially installed on the inner wall of the drilling machine outer barrel, one end of the valve flap is movably connected with an outer sidewall of an upper end of the valve seat; the upper end of the valve seat has a valve opening sealing surface adapted to the valve flap; the valve flap includes an elastic sealing ring, elastic connecting strips, sealings, and a plurality of locking strips arranged in parallel; the elastic connecting strip connects all the locking strips in series, and the elastic sealing ring loops all the locking strips together to form an integral structure, and the sealings are located between adjacent locking strips;
the trigger mechanism comprises a trigger inner barrel and a trigger block, and a side wall of the trigger inner barrel is provided with a through hole, the trigger block is arranged in the through hole;
wherein an outer wall of a bottom of the core barrel is provided with a protrusion that matches the trigger block, the inner wall of the drilling machine outer barrel is fitted with a recessed opening adapted to the trigger block, the trigger block is located above the valve flap, and the recessed opening is located above the trigger block;
when the core barrel is located in the valve seat, the trigger inner barrel is located between the core barrel and the drilling machine outer barrel, a lower end of the trigger inner barrel is mated with the valve seat, the trigger block protrudes from the inner sidewall of the trigger inner barrel and the valve flap is opened by 90° and is located between the trigger inner barrel and the drilling machine outer barrel;
when the core barrel is lifted a certain distance above the valve seat, the valve flap returns to a top face of the valve seat to make sealing contact with the valve opening sealing surface, adjacent locking strips are in sealing contact, and a bottom of the trigger inner barrel is pressed against the valve flap.

2. The core barrel sealing structure according to claim 1 , characterized in that the trigger mechanism also includes a trigger spring, that is sleeved outside the trigger inner barrel; the outer wall of the trigger inner barrel is provided with a shoulder, the lower end of the trigger spring is pressed against the shoulder, and the upper end of the trigger spring is pressed against the step surface of the drilling machine outer barrel; the trigger spring is located above the trigger block.

3. The core barrel sealing structure according to claim 1 , characterized in that the locking strip is provided with a groove adapted to the elastic sealing ring, and the elastic sealing ring is installed in the groove.

4. The core barrel sealing structure according to claim 1 , characterized in that when the valve flap is opened 90°, the locking strip is parallel to the axis of the valve seat.

5. The core barrel sealing structure according to claim 1 , characterized in that when the valve flap is in sealing contact with the valve seat, the valve flap has a circular flat structure.

6. The core barrel sealing structure according to claim 1 , characterized in that except for the two locking strips at the beginning and the end, one side of the other locking strips has a wedge-shaped through groove, and the opposite side has a convex part that fits with the wedge-shaped through groove;
One of the first and last locking strips is provided with a wedge-shaped through groove, while the other locking strip is provided with a convex part;
The convex part of one of the two adjacent locking strips is matched with the wedge-shaped through groove of the other, and the sealing element is arranged between the groove wall and the convex part of the wedge-shaped through groove.

7. The core barrel sealing structure according to claim 6 , characterized in that one of the wedge-shaped through grooves has the limit step surface 1 on the groove wall, while the convex portion of the corresponding locking strip has the limit step surface 2 that matches with the limit step surface 1 ;
When the valve flap is in sealing contact with the valve seat, the limit step surface 1 and the limit step surface 2 are located below the elastic sealing ring, the limit step surface 1 and the limit step surface 2 conflict, and the limit step surface 1 is located on the outside of limit step face 2 .

8. The core barrel sealing structure according to claim 7 , characterized in that the sealing element is installed on the groove wall of the wedge-shaped through groove.

9. The core barrel sealing structure according to claim 1 , characterized in that the valve flap is movably connected to the valve seat through a spring sheet, and the spring sheet includes a rotating shaft and an elastic sheet The outer side wall of the top end of the valve seat has a rotating shaft accommodating groove that matches the rotating shaft, in which the rotating shaft is installed, The outer surface of the valve flap is provided with an elastic sheet accommodating groove for accommodating the elastic sheet, in which the elastic sheet is installed.

10. The core barrel sealing structure according to claim 1 , characterized in that a sealing ring is arranged between the outer wall of the valve seat and the inner wall of the drilling machine outer barrel.

Assignees

• Univ Shenzhen
• Univ Sichuan

Inventors

• Xie Heping
• Chen Ling
• Gao Mingzhong
• Guo Jun
• Zhang Zhilong
• Zhang Zetian
• Lu Yiqiang
• Li Cong
• He Zhiqiang

Classifications

• F16K1/2007 Primary

  specially adapted operating means therefor (operating means per se F16K31/00) · CPC title

• E21B25/08 Primary

  Coating, freezing, consolidating cores (E21B25/06 takes precedence); Recovering uncontaminated cores or cores at formation pressure · CPC title

• E21B25/10

  Formed core retaining or severing means (E21B25/06, E21B25/08 take precedence) · CPC title

• F16K1/2014

  Shaping of the valve member · CPC title

• F16K1/205

  the sealing being arranged on the valve member · CPC title