Product Sheet CST Chronological Sample Taker
Collect up to 90 core samples in one trip.
The CST chronological sample taker acquires sidewall cores using a series of core recovery bullets fired into the formation. Various bullet designs are available, corresponding to the degree of formation consolidation.
This percussion-type gun is accurately depth positioned by using a spontaneous potential or gamma ray log. A surface-controlled, electrically ignited powder charge fires a hollow cylindrical bullet into the formation at each sample depth.
Each bullet is attached by two retaining wires to the gun; these are used to retrieve the bullet and core. The wires have a breaking strength of approximately 1,800 lbf to release the gun from the core bullet, which prevents a stuck core resulting in a stuck CST sample taker.
Share This
To download this file you first sign in to your Schlumberger account.
Don't have an account? Click below to get started.
Sign In Sign Up for an accountPremium content requires special account permissions. We need a little more information from you before we can grant you access.
Complete account setup