Services

It has been widely acknowledged that core handling is critical to the maintenance of core integrity. Unfortunately, cores often don’t undergo adequate handling procedures

The rig site handling of unconsolidated core is a risky process that might hamper core integrity if appropriate procedures are utilized.

The main purpose of core preservation is to retain the pore fluids in the undisturbed core samples thus preventing saturation and wettability alteration.

Cases of invasion of core-stabilization products into fractures are often seen. This represents a common and often serious problem in the subsequent geological description of slabbed cores.

The fundamental objective of coring is to obtain core that is representative of the reservoir rock properties.

StoreCore primarily serves the Oil Industry but also provides services to numerous Universities and Research Institutions.

Kirk Petrophysics provides expert on-site core handling services.

Gamma ray

Kirk Petrophysics offers a Total and a Spectral portable Gamma-Ray logger for the evaluation of core samples at the well site. The total Gamma logger is recording the total natural gamma radiation, whereas the spectral gamma logger is recording the relative amounts of the three main constituents that are the sources of the natural radiation (Potassium, Uranium, and Thorium).

Procedure

Measurement intervals can be changed to specific requirements but are normally taken at 6” (15cm) intervals for 10 seconds acquisition time.

The amounts of each of these elements and the total/spectral gamma-ray counts are then plotted as a function of depth in a well log fashion.

Approximately, a minimum of half an hour is required to log 30m of core.

The portable gamma ray unit is operated on any types of inner tubes (fibre glass or aluminium) on its full length or can be operated on small section of 1 meter cut on special circumstances.

The equipment does not contain any radioactive source and merely records the gamma radiated from the core itself. It is hand carried by the engineer at the well site.

Applications

The logs generated using the gamma logger can be used:
To correlate the depths of the other well logs
To confirm the depths of the core sample within each sample box.
To differentiate sedimentary environments: Sand/Shale indications.
To identify fractures due to variable uranium concentration.
To select the depth for onsite plugging