Coring is a unique process, designed to capture a pristine sample of rock and bring it to surface for analysis.
A core barrel with a centre-less bit is run downhole. The bit cuts an outer ring of rock, leaving the centre untouched. As the tool progresses, the core stacks within the barrel. At the end of the run – ideally the full barrel length – the core barrel is brought back to surface, holding the core in specially designed tubes. Coring can be expensive, due to multiple tripping, but the value of the reservoir information captured by the core is undeniable. Coring is vital in helping operators assess their reservoirs.
A lot of effort has been spent optimizing coring technologies and processes, resulting in extended run lengths and improved ROP. Even so, many coring jobs still suffer from slip and stick and drill string vibrations that result in jamming, forcing the barrel to be pulled to surface. Slip and stick vibrations do not just damage the equipment but also the core, reducing its value to the operator.
By placing NeoTork immediately above the barrel, the risk of slip and stick and vibration from vertical string movement is reduced. Jamming is less likely to occur; longer, better quality core can be recovered in a single run.