Pajari Instruments Ltd., since 1945




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   e-SYNC - Core Orientation Surveying

Diagram - not to scale


The principle in surveying with the core orientation instrument is to obtain measurements that will allow core samples to be oriented to their original inclination and toolface positions prior to being removed from the ground. A separate survey will have to be performed in applications requiring azimuth measurement.

A core orientation survey typically does not have to be performed each time the core barrel is retrieved. The toolface (also known as roll) line on the core sample can be extended onto multiple pieces of core as long as each pieces of core can be fitted to the next piece of core. A core orientation survey can be performed periodically as required during the drilling program. A core orientation survey will have to be performed if the core samples cannot be accurately fitting to each other in order to extend the toolface line. There are many causes for this such as drilling through a fault line.

The survey train can be easily customized to suit different applications and connections such as replacing the spearhead with a cable swivel. The instrument can be threaded directly into equipment which has a 1" 16TPI thread and can be used with other equipment with a different thread configuration by adding thread adapters. Standard and custom thread adapters are available.

There are different core orientation marking systems available. Depending on your application and borehole characteristics, the most ideal system can be selected.

This method is capable of surveying holes drilled at any angle since standard procedures used in drilling can be used to place the survey train at the survey site.

Information to provide when requesting a quotation:

If available, please includes details about your surveying application so we can provide a detailed quotation and/or additional information. Common details to include are:

  • What is the core size(s)?

  • What is the direction (upward, downward, horizontal, etc) of the hole?

  • What is the length of the hole?

  • Is the hole water filled?




Pajari Instruments Ltd. 2015

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