GBS Large Diameter Geotechnical Wireline Core Barrel

GBS Large Diameter Geotechnical Wireline Core Barrel

GBS Geotechnical Wireline Core Barrels produces 102mm core in a wide range of geological formations

GBS Head Assembly

This highly versatile core barrel system is used widely in geotechnical works to obtain large diameter cores in a wide range of geological formations.

GBS is particularly effective when high quality cores are required in clay, sand or loose, weak formations. The standard core of 102mm is completely retained in a clear PVC Coreliner and is easily extracted in one piece after each core run.

The inner tube assembly latches inside the outer core barrel and is lifted to the surface by a overshot device connected to a wireline cable. The wireline retrieval method greatly improves production rates compared to conventional coring method but also leaves the borehole fully cased at all times ensuring borehole stability in sensitive geology.

There are several different methods of using this core barrel:

Method 1: For coring medium to hard formations. The bit setting is 146mm OD x 102mm ID. TC or diamond bits can be used depending on geology.

Method 2: For coring in soft formations.  TC bits are mainly used which consist of two parts – pilot and reamer. The reamer OD is 150mm and pilot ID is 102mm.

Method 3: For coring in very soft or loose formations. The bits are the same as method 2 but a special extended core lifter case runs 25mm in front of the bit.

Method 4: For coring in very soft or loose formations. The core lifter case is extended to run 60mm in front of the bit. The inner tube is spring loaded so that the core lifter case retracts behind the bit when harder formations are encountered. The bit setting is 146mm OD  x 109mm ID

Method 5: Shelby tube sampling of soft or very soft formations. This is an attachment that replaces the inner tube and has at the bottom end a shelby tube which samples ahead of the bit. The bit is same as method 1

Method 6: Full hole drilling assembly, this is an attachment that replaces the inner tube for non-coring purposes. The core bit is same as method 1 and the non-coring bit is 101.6mm diameter.  For pilot coring ahead of the GBS barrel, it is possible to attach a smaller diameter core barrel (T6-101 or smaller) in place of the non-coring bit.

Advantages:

1. Large diameter, high-quality core

2. Ability to obtain good recovery in a wide range of geological formations

3. Excellent hydraulics 

4. Very versatile system

Keywords:

Core Barrels

Craelius Core Barrel

Longyear Core Barrel

Boart Longyear Core Barrel

Secoroc Core Barrel

Atlas Copco Core Barrel

Wireline Core Barrel

AQTK Core Barrel

BQ Core Barrel

NQ Core Barrel

HQ Core Barrel

PQ Core Barrel

NMLC Core Barrel

HMLC Core Barrel

NWG Core Barrel

HWG Core Barrel

AQWL Core Barrel

BQWL Core Barrel

NQWL Core Barrel

HQWL Core Barrel

PQWL Core Barrel

SQWL Core Barrel

Double Tube Core Barrel

Metric Core Barrel

T2-66 Core Barrel

T2-76 Core Barrel

T2-86 Core Barrel

T2-101 Core Barrel

T6-76 Core Barrel

T6-86 Core Barrel

T6-101 Core Barrel

T6-116 Core Barrel

T6-146 Core Barrel

WT SERIES CORE BARRELS:

BWT SERIES CORE BARRELS

NWT SERIES CORE BARRELS

HWT SERIES CORE BARRELS

PWT SERIES CORE BARRELS

WM SERIES CORE BARRELS:

AXM/AWM SERIES CORE BARRELS

AXM SERIES CORE BARRELS

AWM SERIES CORE BARRELS

BWM SERIES CORE BARRELS

NWM SERIES CORE BARRELS

HWM SERIES CORE BARRELS

WG SERIES CORE BARRELS:

BWG SERIES CORE BARRELS

NWG SERIES CORE BARRELS

HWG SERIES CORE BARRELS

WF SERIES CORE BARRELS:

NWF SERIES CORE BARRELS

HWF SERIES CORE BARRELS

BWL Core Barrel

NWL Core Barrel

HWL Core Barrel

PWL Core Barrel

core barrels for mining exlopration and geological drilling

Triefus Triple Tube Core barrels

CONVENTIONAL DOUBLE TUBE CORE BARRELS

TT Series Core Barrels

T2 Series Core Barrels

T6 Series Core Barrels

T6 Series Core Barrels

WF / WG Series Core Barrels

CONVENTIONAL TRIPLE TUBE CORE BARRELS

WIRELINE DOUBLE TUBE CORE BARRELS “W/L”

WIRELINE TRIPLE TUBE CORE BARRELS “W/L3”

For more information, please contact:

ROSCHEN INC.

ROSCHEN GROUP LIMITED

ROSCHEN HOLDINGS LIMITED

Skype: ROSCHEN.TOOL , ROSCHEN_GROUP

WeChat: +86-137 6419 5009 ; +86-135 8585 5390

WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390

Email: roschen@roschen.com ; roschen@roschen.net

Website: http://www.roschen.com ; http://www.roschen.net

http://www.roschen.cn ; http://www.roschendrill.com

http://www.roschenmining.com ; http://www.roschendrilling.com