Fishing Tool Overshot Assembly
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Type:
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Product Description
Key Features
The Wireline Advantage: Core on Demand
Wire line core barrels are used when coring to greater depths, mainly because they eliminate the need to couple and uncouple the rod string each time the core is retrieved. An overshot device is dropped on a cable and directly couples onto the inner tube assembly, allowing fast retrieval of the core after each core run. Available in DCDMA standard : A B, N, H. and P series .
Wireline Core barrels Selection
For Core barrels, first determine the orientation of the borehole. If the borehole will be drilled between vertical down to 45 degrees from vertical down (-90 degrees to -45 degrees), choose one of the three surface style systems, for flatter or up holes choose within the two underground ranges of Core barrel system. For surface style selections, determine if the application requires a double tube or a triple tube design. If a double tube design is preferred then choose if a standard wall or thin wall design is favored , Likewise, for underground style selections, determine if a standard wall or thin wall design is favored.
Core retrieval while drilling, lift-out for sampling.
The coring system produced by our company allows the underground core to be retrieved from the hole by the fishing tool without lifting out the drill pipe, and then the entire inner pipe can be retrieved for sampling and analysis. Improve the productivity of the work site and ensure the safety of the core while drilling.
Specifications
B /N / H/ P – WL Overshot Spare Parts
| Item | Part No. | Description | Qty/pc | Weight |
| 1 | D-01 | Eye Bolt | 1 | 0.11 |
| 2 | D-02 | Cable Swivel Colar | 1 | 0.11 |
| 3 | D-03 | Thrust Bearing | 1 | 0.01 |
| 4 | D-04 | Castle Nut | 1 | 0.02 |
| 5 | D-05 | Cotter Pin 3.2×20 | 1 | 0.01 |
| 6 | D-06 | Cable Swivel Body | 1 | 7.23 |
| 7 | D-07 | Locking Sleeve | 1 | 1.56 |
| 8 | D-08 | Jar Tube | 1 | 2.81 |
| 9 | D-09 | Jar Staff | 1 | 1.02 |
| 10 | D-10 | Nut 3/4-10 uncap | 1 | 0.05 |
| 11 | D-11 | Cap Ezy Lock | 1 | 0.09 |
| 12 | D-12 | Spring Ezy Lock | 1 | 0.03 |
| 13 | D-13 | Sleeve Ezy Lock | 1 | 0.36 |
| 14 | D-14 | Overshot Head Ezy Lock | 1 | 2.66 |
| 15 | D-15 | lock Nut m10×12 | 1 | 0.01 |
| Specification | Wire line Core Barrel Type | |||
| Model | B W/L | N W/L | H W/L | P W/L |
| Hole Diameter (mm) | 59.9 | 75.7 | 96.3 | 122.8 |
| Core Diameter (mm) | 36.4 | 47.6 | 63.5 | 85.0 |
| Kerf / Crown Thickness (mm) | 11.6 | 13.9 | 16.2 | 18.5 |
| Cutting Area (cm2) | 18.3 | 27.2 | 41.1 | 61.7 |
| Hole Area (cm2) | 28.3 | 45.0 | 72.8 | 118.5 |
| Cutting Area as % of Hole Area | 64% | 60% | 56% | 52% |
| Core Area (cm2) | 10.3 | 17.8 | 31.7 | 56.8 |
| Recommended Drill Rod | B W/L | N W/L | H W/L | P W/L |
| Recommended Casing | BW | NW | HW | PW |
| Conversion to triple tube possible | Yes | Yes | Yes | Yes |
Key to Main Parts of W/L Core Barrel Assembly
Complete core barrel consists of:
- Core Barrel Head Assembly
- Inner Tube 1.5m or 3.0m
- Stop Ring
- Core Lifter
- Core Lifter Case
- Locking Coupling
- Adapter Coupling
- Landing Ring
- Outer Tube 1.5m or 3.0m
- Inner Tube Stabilizer
NOTE: *BQ reaming shell and BQ core bit are not included in the core barrel assembly
Application
As a general rule, use these determining factors to focus on the correct sections to select products for the given applications.
Application:
- Application 1 : Surface drilling; between vertical down and 45 degrees from vertical down.
- Application 2 Underground drilling; for flatter or up-hole angle.
Tube Design :
- Double Tube : Standard and used in most drilling applications. Not recommended in extremely broken or loose rock formations. NOTE: Only applicable for surface application.
- Triple tube : Used in Broken to very broken Rock formation and friable material and ground formations.
Wall Design ：
- Standard Wall : Used for all ground conditions.
- Thin Wall : For competent ground formations combined with high rotation speed, low feed force drills for improved rate of production. Offers lightweight options for biggest core size per comparable system size.
