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Overburden Casing System, also named Concentric/Symmetrix Casing System, is suitable for drilling water wells, geothermal wells, short mircopiles, medium mini-type grouting hole of building, and diamond harbour projects.
Economy: Concentric systems offer the most economical solution because the ingenious reaming wing bit is retrievable and can be reused for the next hole.
Working Principle: During drilling, the reamer bit rotates out to enlarge the hole sufficiently for the casing tube to slide down behind it. Once the required depth is reached, the drill pipe drills in the reverse direction, the reamer bit retracts, and the entire drilling system can pass through the casing.
| Outer Dia Of Casing Tube (mm) | Inner Dia Of Casing Tube (mm) | Reamed Dia (mm) | Min Inner Dia Of Casing Shoe (mm) | Drill Pipes (mm) | Max Outer Dia of Normal Bit (mm) |
|---|---|---|---|---|---|
| 114 | 101-103 | 127 | 91 | 76 | 77 |
| 127 | 114-116 | 136 | 101 | 76 | 82 |
| 140 | 124-127 | 152 | 117 | 76 | 92 |
| 146 | 127-132 | 154 | 117 | 76 | 105 |
| 168 | 149-155 | 184 | 140 | 76 | 105 |
| 178 | 159-165 | 194 | 150 | 76.89 | 125 |
| 219 | 199-206 | 234 | 184 | 89.114 | 150 |
| 273 | 251-257 | 305 | 240 | 114 | 190 |
| 406 | 382-388 | 440 | 364 | 127 | 255 |
| 508 | 484-490 | 538 | 464 | 140 | 385 |
| 610 | 586-592 | 642 | 566 | 140 | 485 |
| 711 | 687-693 | 745 | 665 | 168 | 590 |
Our corporation is an integrated entity specialized in manufacturing and exporting top quality drilling equipment and parts for over decades. Our product range includes electroplated diamond drill bits, hot-pressed diamond drill bits, matching reamers, PDC core drill bits, wireline core drill bits, tricone bits, geological drill rods, and more.
We offer a full range of specifications and models direct from the factory with guaranteed quality and competitive pricing. Supported by an experienced team of designers and engineers, we provide customized solutions to meet specific client requirements successfully.
