Standard API Drill Pipe

Appendix B gives the dimensions and mechanical properties for standard API drill pipe. This is the drill pipe used in most rotary drilling operations shallow and deep . API drill pipe are fabricated by various API certified manufacturers around the world, principally for use in the drilling of deep wells for the recovery of oil and natural gas. Table B-3 gives the drill pipe dimensions outside diameter, inside diameter, and weight per unit length of the pipe body of various drill pipe sizes....

Standard Drill String

Drill Pipe Tool Joint Diagram

Figure 3-1 shows a schematic of a standard rotary drill string used to drill deep boreholes with direct circulation. Such a drill string would be used on large drilling rigs. At the bottom of the drill string is the drill bit. The drill bit is threaded made-up to a bit sub. The drill bit has a male thread or threaded pin pointing up. The bit sub is a short thick wall pipe that has a female thread or threaded box on both ends. Above the bit sub are the drill collars. Each of the drill collars...

Stabilizers and Reamers

Oilwell Bha

Stabilizers and rolling cutter reamers are special thick walled drill collar subs that are placed in the BHA to force the drill collars to rotate at or near the center of the borehole. By keeping the drill collars at or near the center of the borehole the drill bit will drill on a nearly straight course projected by the center axis of the rigid BHA. Stabilizers and rolling cutter reamers have blades or rolling cutters that protrude from the sub wall into the annulus to near the borehole...

Blowout Prevention Stack

Underbalanced Drilling Bop

Blowout prevention equipment was developed for use in drilling deep wells for the recovery of oil and natural gas. Later this unique oil and gas industry equipment was adapted for use in drilling deep geothermal wells. Natural deposits of oil and gas exist in porous rock formations deep in the earth's crust. These deposits were created by millions of years of sediment burial and confinement by geologic structures. Over time, increased sedimentary burial created high pressures and temperatures...