Drilling with Casing Defyer™ DV Series The Weatherford Defyer DV is a drillable casing bit designed for drilling with casing in very soft and soft unconsolidated formations with confined compressive strengths up to 4,000 psi (27.6 MPa). The innovative design incorporates an aluminum inner core with integral cutting blades. The blades are coated with a thin layer of tungsten carbide to resist abrasion during drilling. Carbide inserts are mounted on the shoulder, outside drift diameter, to reduce shoulder wear and ensure effective cutting operations. Available in sizes from 9-5/8 to 20 in., the Defyer DV can be easily made up on conductor and surface casing strings. A range of interchangeable drillable nozzles is available to ensure optimal hydraulic performance. Applications • Drilling surface and conductor casing in very soft and soft unconsolidated formations • Reaming casing through unstable hole conditions or excessive borehole caving or in severely swelling formations • Reaming of swelling formations and tight spots to improve hole quality using the backreaming feature Photo depicts the 9 5/8- × 12-in. Defyer DV 300. 10 9 8 6 ft So UCS x1000 × 1,000psi psi Ver y So f t 1 0 14 15 16 82.5 80.8 77.8 75.3 17 18 19 73.2 72.2 20 71.3 84.5 69.7 89.5 3 2 13 rd Ha 4 12 Medium 7 5 11 68.2 92.8 21 22 23 97.1 66.9 108.9 65.6 24 25 Sonic Transit Time (DT), µs/ft Defyer DV DV Series Series Defyer Unconfined Compressive Strength (UCS) Range 1,000to - 4,000 1,000 4,000 psi psi weatherford.com 1 © 2005–2014 Weatherford. All rights reserved. 4671.02 Drilling with Casing Defyer DV Series ™ Features, Advantages, and Benefits The tungsten carbide cutting structure has high-standoff fishtail blades and a wave cutting profile. This design enhances cutting efficiency, rate of penetration, and durability. The fully drillable center nose section enables rapid, damage-free drillout with conventional polycrystalline-diamond-compact (PDC) bits, roller-cone bits, or another Defyer assembly. This eliminates the need for a special drillout run or retrieval of the bottomhole assembly after drilling to total depth. Gauge pads with tungsten carbide inserts maintain gauge protection and reduce the potential for undergauge hole. Total Blade Count Interchangeable, drillable nozzles increase hydraulic horsepower at the bit to optimize hydraulics and improve penetration rates. Cutter Size (mm) D V 3 00 * Defyer Primary Cutting Structure P – PDC T – TSP V – HVOF Special Feature B – Bicenter or dual axis G – Enhanced gauge protection K – Backreaming L – Light version N – Nudging S – Special drift V – Extra face volume or blade standoff Nomenclature for the Defyer DV series weatherford.com 2 © 2005–2014 Weatherford. All rights reserved. 4671.02 Drilling with Casing Defyer DV Series ™ Specifications Nominal size (in.) 9-5/8 × 10-5/8 Defyer code DV300-095105 DV300-095116U DV300-095120 DV300-095120U DV300-095122U DV300-133152 DV300-133170 OD (in., mm) 10-5/8 269.9 9-5/8 × 11-3/4 9-5/8 × 12 11-3/4 298.5 9-5/8 × 12-1/4 13-3/8 × 15-1/4 12 304.8 12-1/4 311.2 Casing weight and grade 13-3/8 339.7 2.27 0.69 Length (ft, m) 150.0 68.0 170.0 77.0 178.6 81.0 Number of blades 2.59 0.79 170.0 77.0 178.0 80.7 3 Dense, thin layer of tungsten carbide Cutting structure (on casing body) Carbide 6.60 167.6 6.89 175.0 6.74 171.2 6.89 175.0 Tungsten carbide briquettes Machined steel Tungsten carbide briquettes Machined steel 11.98 77.3 18.27 117.9 22.07 142.4 Total flow area 9.42 239.3 8.55 217.2 Tungsten carbide briquettes Dependent on nozzle selection Equivalent casing grade (ksi, MPa) 21.75 140.3 25.32 163.4 16.06 103.6 41.38 267.0 51 352 Nose material weatherford.com 383.6 174.0 6 Cutting structure (drillable core) Junk slot area (in.2, cm2) 273.4 124.0 3 Number of nozzles Gauge protection 17 431.8 As requested Connection Gauge length (in., mm) 13-3/8 × 17 15-1/4 387.4 9-5/8 244.5 Casing size (in., mm) Weight (lb, kg) 9-5/8 × 12 Drillable alloy 3 ©2005–2014 Weatherford. All rights reserved. 4671.02 Drilling with Casing Defyer DV Series ™ Specifications (continued) Nominal size (in.) Defyer code 18-5/8 × 21 18-5/8 × 21 18-5/8 × 24 21 533.4 OD (in., mm) 2.18 0.66 Length (ft, m) 2.41 0.73 418.9 190.0 Weight (lb, kg) 440.0 199.6 Number of blades 3 6 9 Cutting structure (drillable core) Dense, thin layer of tungsten carbide Cutting structure (on casing body) Carbide 6.85 174.0 6.35 161.6 Gauge protection Tungsten carbide briquettes Total flow area Dependent on nozzle selection 39.08 252.1 76.95 496.5 Equivalent casing grade (ksi, MPa) 51 352 Nose material weatherford.com 20 508.0 As requested Connection Junk slot area (in.2, cm2) 20 × 24 24 609.6 Casing weight and grade Gauge length (in., mm) 20 × 24 18-5/8 473.1 Casing size (in., mm) Number of nozzles 18-5/8 × 24 DV300-185210 DV300-185210W DV300-185240 DV300-185240W DV300-200240 DV300-200240W Drillable alloy 4 © 2005–2014 Weatherford. All rights reserved. 4671.02 Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford and may be registered in the United States and/or other countries. Weatherford products named herein may be protected by one or more U.S. and/or foreign patents. Specifications are subject to change without notice. Weatherford sells its products and services in accordance with the terms and conditions set forth in the applicable contract between Weatherford and the client.
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