• NS-1™ & NS-2™ for when you need equipment manufactured and inspected to a higher standard

  • Reducing Non-productive Time - Increasing Performance

  • Manufacturing and Inspection Standards to reduce the risk of equipment failures whilst drilling

  • NS-1™ and NS-2™ Designed to supplement the API standards when conditions warrant it

NS-3™ Drill String Design Manual

The Drill String Design Manual has been produced to assist engineers in the selection, design and placement of the appropriate components within a drill string; taking into consideration the environment and the stresses and strains that the drill string will be required to operate under.

Written by specialist drilling engineers it will assist in your drill string design for a particular well or, if required, even help you to design your new drill string from scratch.

Drill string design is: 

Selecting items from a list of ready-made components, not deciding what an individual component will look like.

Selecting components that are able to withstand the combined loads applied during drilling operations (e.g. torsion & tension) ensuring that the stresses produced do not exceed the component's yield strength.

The objectives of the publication are to help you to:

  • Reduce the risk of failure by selecting drill string components and component features that reduce drill string fatigue during drilling operations.
  • Prevent damage to the drill string and achieve the desired weight on bit by selecting components that will prevent buckling while rotary drilling and allow the degree of buckling to be controlled for sliding operations.
  • Select equipment that is resistant to corrosive environments that may damage the drill string, such as Stress Corrosion Cracking (SCC) caused by the presence of Hydrogen Sulphide (H2S), chlorides and oxygen.