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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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820 Drilling and Well Completions<br />

Table 4-104<br />

Hevi-HitterTM Jar Impact Forces (1,000 Ibm) [57A]<br />

-~<br />

Heavy-Welght Drill Pipe or Drlll Collar Weight Above Jars (Ibs. x 1,000)<br />

4 6 8 10 12 14 16 18 20<br />

h<br />

8<br />

9<br />

3<br />

45<br />

4 60<br />

E 5 75<br />

6 90<br />

cri<br />

p 7 105<br />

v<br />

E 8 120<br />

.P 9 135<br />

10 150<br />

11 165<br />

h 12 180<br />

$ 13 195<br />

14 210<br />

=<br />

2<br />

15 225<br />

a' 16 240<br />

68<br />

90<br />

113<br />

135<br />

158<br />

180<br />

202<br />

225<br />

247<br />

270<br />

229<br />

31 5<br />

337<br />

359<br />

90<br />

120<br />

150<br />

180<br />

210<br />

240<br />

270<br />

300<br />

330<br />

359<br />

389<br />

41 9<br />

449<br />

479<br />

113<br />

150<br />

187<br />

225<br />

262<br />

300<br />

337<br />

374<br />

41 2<br />

449<br />

487<br />

524<br />

562<br />

599<br />

135<br />

180<br />

225<br />

270<br />

31 5<br />

359<br />

404<br />

449<br />

494<br />

539<br />

584<br />

629<br />

674<br />

71 9<br />

157<br />

21 0<br />

262<br />

31 5<br />

367<br />

41 9<br />

472<br />

524<br />

576<br />

629<br />

681<br />

733<br />

786<br />

838<br />

180<br />

240<br />

300<br />

359<br />

419<br />

479<br />

539<br />

599<br />

659<br />

71 9<br />

778<br />

838<br />

898<br />

958<br />

202<br />

270<br />

337<br />

404<br />

472<br />

539<br />

606<br />

674<br />

74 1<br />

808<br />

876<br />

943<br />

1010<br />

1078<br />

225<br />

300<br />

374<br />

449<br />

524<br />

599<br />

674<br />

748<br />

823<br />

898<br />

973<br />

1048<br />

1122<br />

1197<br />

Courtesy Hughes Christensen.<br />

Hole opening is considered as opening or enlarging the hole from the surface<br />

(or casing shoe) downward using a tool with cutter arms at a fixed diameter.<br />

Thus, the proper name for the tools with expandable cutting arms is underreamers.<br />

The cutting arms are collapsed in the tool body while running the tool<br />

in the hole. Once the required depth is reached, mud circulation pressure moves<br />

the cutters opening for drilling operation. Additional pressure drop across the<br />

underreamer orifice gives the operator positive indication that the cutter arms<br />

are extended fully and the tool is underreaming at full gauge.<br />

Underreamer Design. There are two basic types of underreamers: (1) roller<br />

cone rock-type underreamers and (2) drag-type underreamers. The roller cone<br />

rock-type underreamers are designed for all types of forma-tions depending upon<br />

the type of roller cones installed. The drag-type under-reamers are used in soft<br />

to medium formations. Both types can be equipped with a bit to drill and<br />

underream simultaneously. This allows for four different combinations of<br />

underreamers as shown in Figure 4-174 [58]. Nomenclature of various underreamer<br />

designs are shown in Figures 4-175, 4-176, and 4-177 [58].<br />

Underreamer Specifications. Table 4-105 [58] shows example specifications for<br />

nine models of Servco roller cone rock-type underreamers. Table 4-106 contains<br />

example data for four models of Servco drag-type underreamers [58].<br />

Underreamer Hydraulics. Pressure losses across the underreamer nozzles<br />

(orifice) are shown in Figures 4-178 and 4-179 [58]. The shaded area represents<br />

the recommended pressure drop required for cutters to fully open. These<br />

pressure drop graphs can be used for pressure losses calculations (given pump<br />

output and nozzles) or for orifice (nozzle) selection (given pump output and<br />

pressure loss required).

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