Concentric Casing System With Blocks
Concentric Casing System With Blocks

 

                                            

              Assembly                                                        Pilot bit                                                                                       Blocks

Operation Procedure

1.when the drilling starts, the blocks slides down through the
grooves on pilot bit,and reams to drive the casing shoes
and tubes into the hole.                                                                                                                          

2. When finished the drilling in overburden rock formations, raise
the drilling tools and the blocks will get closed through the
grooves,and the drilling tools can be pulled out from the hole.

3. Next construction can be followed. 

 

 Main specifications:

A B C D E F
Outer Dia.of Casing Tube Inner Dia.of Casing Tube Reamed Dia. Min.Inner Dia.of Casing Shoe Hammer Type Drill Pipes
mm mm mm mm   mm
168 149-155 184 140 TH122 76,89
178 159-165 194 150 TH122 76,89
193 173-180 206 164 TH139 89,114
219 199-206 234 182    TH139,TH1800                      89,114   
244 224-231 260 210 TH180,TH220 114
273 251-257 305 240 TH180 114,127
323 301-310 348 284 TH180,TH220 127
406 382-388 440 364 TH220,TH275 127,140
457 433-439 488 413 TH275 127,140
508 484-490 538 464 TH275 140
558 534-540 590 514 TH275,TH398 140
610 586-592 642 566 TH275,TH398 140,168
660 636-642 694 615 TH398 168
711 687-693 745 665 TH398 168
762 738-744 798 716 TH600 168
863 839-845 900 815 TH600 168

 

 Order Guide:A+B+C+D+E