Rig No. 31

Capable of efficiently drilling depths of 13,000'
Using 4-1/2" drill pipe

  • National 55 Drawworks with 40" Double Parkersburg Hydromatic Brake powered by Two Waukesha F-2896 Diesal Engines rated 500 HP each with 27" Twin Disc Fluid Couplings

  • 136' x 18.6' Drilling Structures Jackknife Derrick with 11' clearance under Rotary Beams, Capacity 550,000# 

  • Emsco F-800 800HP  6" x 9" Triplex pump driven from compound

  • Emsco f-1000 6" x 10" Triplex Pump independently driven by Caterpillar 3508 Diesal Engine rated at 915 HP

  • 20-1/2" Emsco  Rotary Table

  • Shaffer Type LWS 11" - 5,000# Double Gate Blowout Preventer, 5,000# working pressure,  with 4-1/2" and C.S.O. rams

  • 11" - 5,000# GK Hydril Preventer 

  • Two 250 KW Three Phase 110-440V AC Generators with D3408 PCTA Caterpillar Engines

  • Vapor Proof Lighting System

  • Three  Steel Mud Tanks, 920 Bbl  Capacity 

  • Two Brandt King CobraLinear  Shaker

  • Brandt 2 Cone Desander 

  • Brandt 16 Cone Desilter

  • 10,000' 4-1/2" OD 16.60# Grade E Drill Pipe and 2,800' 4-1/2" OD 16.60# Grade G Drill Pipe with 4-1/2  Extra Hole Connections

  • 18 6-1/8", 6-1/2" OD  x 2 - 13/16" ID x 30'  Drill Collars with 4 - 1/2" Extra Hole Connections; 2 - 8" OD Drill Collars with 6-5/8"  Regular Connections

  • 450 Bbl. Water Tank

  • 100 HP Boiler

  • Trailer House