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2. Pipe recovery operations - Wikipedia

   en.wikipedia.org/wiki/Pipe_recovery_operations

   The Drill Collar Severing Tool is often used to separate heavy weight drill pipe or drill collars. The DCST contains an explosive charge at either end of the tool; both charges are detonated simultaneously. The explosive shock waves meet in the center of the tool and combine to produce a very high energy wave capable of cutting through the ...

3. Bottom hole assembly - Wikipedia

   en.wikipedia.org/wiki/Bottom_hole_assembly

   Rotary assemblies [2] are commonly used where formations are predictable and the rig economics are an issue. In such an assembly the weight of the drill collars gives the BHA the tendency to sag or flex to the low side of the hole, collar stiffness length and stabiliser diameter and placement are engineered as a means of controlling the flex of the BHA.

4. Oil well control - Wikipedia

   en.wikipedia.org/wiki/Oil_well_control

   Pump pressure, which is also referred to as system pressure loss, is the sum total of all the pressure losses from the oil well surface equipment, the drill pipe, the drill collar, the drill bit, and annular friction losses around the drill collar and drill pipe. It measures the system pressure loss at the start of the circulating system and ...

5. Tripping (pipe) - Wikipedia

   en.wikipedia.org/wiki/Tripping_(pipe)

   The most typical reason for tripping pipe is to replace a worn-out drill bit. Though there are many problems that occur to warrant the tripping of pipe. Downhole tools such as MWD (measurement while drilling), LWD (logging while drilling) or mud motors break down quite often. Another common reason for tripping is to replace damaged drill pipe.

6. Drill stem test - Wikipedia

   en.wikipedia.org/wiki/Drill_stem_test

   Drill stem testing involves deploying a series of tools known as a test bottom hole assembly (BHA). A basic drill stem test BHA consist of a packer or packers, which act as an expanding plug to be used to isolate sections of the well for the testing process, valves that may be opened or closed from the surface during the test, and recorders ...

7. This DeWalt brand drill set is nearly half off during Black ...

   www.aol.com/lifestyle/this-dewalt-brand-drill...

   Get 50% off this bestselling drill set from Dewalt during Black Friday. The set comes with a drill, driver, battery charger, carrying case, and two batteries.

8. Recruit’s training death was ‘avoidable,’ Marines say. Was it ...

   www.aol.com/news/recruit-training-death...

   A new report says Beals’ senior drill instructor, who allegedly berated and overworked the recruits, did not respond to or recognize Beals’ signs of distress. Recruit’s training death was ...

9. Measurement while drilling - Wikipedia

   en.wikipedia.org/wiki/Measurement_while_drilling

   MWD tools may be semi-permanently mounted in a drill collar (only removable at servicing facilities), or they may be self-contained and wireline retrievable. [citation needed] Retrievable tools, sometimes known as Slim Tools, can be retrieved and replaced using wireline through the drill string. This generally allows the tool to be replaced ...