# US 7,743,827 B2 · Remote operation wire line core sampling device

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- Number: US 7,743,827 B2
- Document ID: US7743827B2
- Status: Granted
- Kind: B2
- Application number: 10/563,366
- Filed: 2004-09-01
- Published: 2006-08-03
- Granted: 2010-06-29
- Earliest claimed: 2003-09-05
- Assignees: Mitsui Engineering & Shipbuilding Co., Ltd.; K. Maikai Co., Ltd.; Toho Chikakoki Co., Ltd.
- Inventors: Yukio Kadomoto; Isao Yamanaka; Hiroshi Tanaka; Takahiko Tsuchiya
- Web page: https://patentgrep.com/patent/US7743827B2

## CPC

- E21B 25/02: the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

Remote operation wire line core sampling device capable of increasing efficiency of working and maintaining a wall of a hole using a stabilized sea-bottom core drill at a sea-bottom, and adopting a wire line system. The device includes a drill rod held by a chuck of the sea-bottom core drill, a wire line core barrel having, at a tip thereof, a bit for annularly drilling into ground, an inner tube assembly detachably incorporated in the wire line core barrel, and an over-shot assembly having a function for engagement thereof with a spear head part at a top end of an inner tube assembly. The device also includes a water swivel in which water supply ports are formed at upper and lower parts thereof, a modified built-in type over-shot assembly is formed at upper and lower parts thereof, and a modified built-in type over-shot assembly is incorporated therein to reside at an intermediate part thereof.

## Claims

### Claim 1

A remote operation wire line core sampling device comprising:
a water swivel assembly;
a drill rod coaxially connected to said water swivel assembly;
a wire line core barrel coaxially connected to a lower end of said drill rod and having at a forward end a bit for annularly digging ground;
an inner tube assembly detachably set in said wire line core barrel; and
an over-shot assembly for grasping an upper end portion of said inner tube assembly,
wherein said water swivel assembly includes an upper water input port at an upper position of said water swivel assembly, said upper water input port adapted to allow pressurized fluid into said water swivel assembly, and a lower water input port at a lower position of said water swivel assembly, said lower water input port adapted to allow pressurized fluid into said water swivel assembly, and
wherein said water swivel assembly accommodates the whole of said over-shot assembly at an intermediate position thereof between said upper water input port and said lower water input port such that the pressurized fluid is supplied from said upper water input port to lower said over-shot assembly through said drill rod to an upper end of said inner tube assembly.

### Claim 2 (depends on 1)

The remote operation wire line core sampling device according to claim 1, further comprising:
a drill head portion of a sea-bottom core drill, said drill head portion having a frame slideably mounted to a mast;
a chuck rotatably mounted to said drill head portion for grasping said drill rod; and
a mechanism for lifting said drill head portion along said frame, while said drill rod is retained in a hole, for extracting said inner tube assembly from said drill rod,
wherein the over-shot assembly is for raising said inner tube assembly through said drill rod.

### Claim 3 (depends on 1)

The remote operation wire line core sampling device according to claim 1, wherein said upper water input port and said lower water input port are located in a side wall of said water swivel assembly.

### Claim 4 (depends on 1)

The remote operation wire line core sampling device according to claim 1, wherein
said water swivel assembly has a hollow region passing therein in a first direction; and
said upper water input port and said lower water input port are positioned in a second direction that is perpendicular to the first direction.

### Claim 5 (depends on 1)

The remote operation wire line core sampling device according to claim 1, wherein said water swivel assembly accommodates the whole of said over-shot assembly at an intermediate position thereof exactly between said upper water input port and said lower water input port.