GBS Large Diameter Geotechnical Wireline Core Barrel
Wireline Triple Tube Core Barrels
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
| Technical Data |
| Specification |
Drilling Method |
| Method 1 |
Methods 2 / 3 |
Method 4 |
Method 5 |
Method 6 |
| Hole Diameter (mm) |
146 |
150 |
146 |
146 |
146 |
| Core Bit set I.D. (mm) |
102 |
102 |
109 |
102 |
102 |
| Core Diameter (mm) |
102 |
102 |
102 |
95 |
N/A |
| Kerf / Crown Thickness (mm) |
22 |
24 |
18.5 |
22 |
22 |
| Hole Area (cm2) |
167.5 |
176.8 |
167.5 |
167.5 |
167.5 |
| Core Area (cm2) |
81.7 |
81.7 |
81.7 |
70.9 |
N/A |
| Recommended Drill Rod |
GBS Monobloc |
| Recommended Casing |
SW |
FAQ
Q: Are you a manufacturer or trading company?
A: We are a specialized manufacturer.
Q: How about the delivery terms?
1. Payment: T/T, L/C, Western Union, Paypal, 30% deposit in advance and rest before delivery.
2. Min. order quantity: 1 piece.
3. Transportation: By DHL/TNT/Fedex express, air, sea, train.
Q: How about discount?
A: Price is based on products and order quantity.
Q: Do you accept sample order?
A: Yes sure, please contact us for details.
Q: How about your after-sales service?
A: As a manufacturer, we offer promt technology support for all problems and questions. Besides, we accept goods return or replace for quality problem.
Q: How does your company control the quality?
A: Quality first. In order to guarantee high quality for our products, Roschen always makes a serious inspection for all products and raw materials in strict procedure. We have obtained certificate of ISO9001:2000 in 2004.
For more information, please contact:
ROSCHEN INC.
ROSCHEN GROUP LIMITED
ROSCHEN HOLDINGS LIMITED
Website: http://roschen.en.made-in-china.com ; http://roschen.en.made-in-china.com
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