The BWL selection of coring barrel is a form of wireline core extraction. It is designed to collect core samples with a diameter of 36.52mm or 1.44 Inches, which is the largest sample size of sample in the form of wireline extraction. 

There are both Standard and Set To Liner variants of  BWL. Our Standard Wireline coring tools are named BWL and use Core Barrel Drill-Line Inner Tube Plastic Liner. When the clear plastic Liner is used (inserted) it will not contaminate the Core sample during drilling and encapsulation.

Our Set to Liner version of the BWL however is named BWL3 meaning the casing string that does not extend to the top of the wellbore, but instead is anchored or suspended from inside the bottom of the previous casing string. Allowing for substantial savings in time and steel.

The key components found in a typical BWL core barrel are; The Inner Tube, Core Bit, Core lifter, Inner Tube Extension, Overshot Assembly, Spring, Spring Liner, Lifter Case and the Catcher Sub.