drill collar

In this instance the drill collars provide the necessary weight on the bit.

Also if a short drill collar is used then the stabilizers can be even closer together.

Weight on bit is achieved by the drill collars.

Type 3 - Uses the drill collars to achieve directional control.

This latter size will normally be the same size as the drill collar.

These can be as simple as only going a few stands down, to pulling the drill collars.

Monel is very rarely used in present day directional drilling collars.

Used within a column of drill collars.

This layout uses only drill pipe and drill collars.

This is because these sensors are compact, inexpensive, reliable, and can take measurements through unmodified drill collars.

Monel drill collars are used in surveying oil wells.

The drill bit, aided by the weight of thick walled pipes called "drill collars" above it, cuts into the rock.

The capacity of drillpipe, drill collars or hole is the volume of fluid that can be contained within them.

Volume of the drillpipe and the drill collars must be pumped to get kill weight mud to the bit during kill operation.

The term is loosely applied as the assembled collection of the drill pipe, drill collars, tools and drill bit.

The BHA consists of the drill bit, drill collars and stabilizers.

Type 2 - Uses heavy weight drill pipe as a transition between the drill collars and the drill pipe.

Collar-mounted tools, also known as Fat Tools, cannot generally be removed from their drill collar at the wellsite.

It is important to note that the stretch test does not take into account drill collars, heavyweight drill pipe, and/or wellbore deviation.

Of particular interest to the buyers were Jessops specialist products, particularly their non-magnetic drill collars and downhole components for the oil and gas industry.

These configurations addressed are usually concerned with the use or layout of drill collars, heavy weight drill pipe and standard drill pipe.

He said orders were relatively strong for products used in power generation, chemical processing and oil-drilling equipment, with a special Cartech drill collar in particular demand.

The function of the HWDP is to provide a flexible transition between the drill collars and the drill pipe.

The assembly can consist of drill collars, subs such as stabilizers, reamers, shocks, hole-openers, and the bit sub and bit.

The assembly of rotating parts that goes down the hole, which is a series of drill pipe connections and drill collars, ending in a rotating bit.