Conventional Coring

RG Coring's standard core barrels feature a simplicity of design and precision of machining that have been trademarks of RG Coring's core barrels for over 50 years. They are made from the finest tubular goods available. The inner and outer tubes are fabricated from high tensile 4141 hot rolled steel to provide durable and dependable service. All barrels and components are manufactured to exacting standards and subjected to rugged field testing to insure safe, dependable and economical service.

The inner barrel is attached to the swivel which in turn attaches to the outer barrel. The swivel contains a bearing assembly which permits the inner barrel to remain stationary as the drill string turns the outer barrel and rotates the core bit. RG Coring bearing assemblies feature long wearing mud lubricated bearings. The inner barrel assembly is attached to the outer barrel with a T.I.W. safety thread connection.

Dowdco - Conventional Coring

Oriented Coring

RG Coring’s Oriented system provides the geometrical orientation of the core within the reservoir by recording the core's direction and inclination as it is cut.

Combined with depth, the data provides the three dimensional position of the core extracted from the subsurface. Structural information is then defined by the orientation of bedding planes and faults encountered throughout the core. The orientation can further be used to calculate critical parameters such as formation dip, strike angle, formation anisotropy, and stress direction. An understanding of these parameters allow for better exploitation of the resource.

The RG Coring oriented system utilizes a magnetic surveying device and a marking device to determine core orientation. The core is "marked" by a scribe ring positioned within the lower shoe. The ring contains three, inwardly facing tungsten blades which etch a scribe line onto the core as it enters the inner barrel. The three blades are angularly positioned so as to identify a reference line along the length of the core. This reference line is then aligned with the survey tool positioned at the top of the inner barrel.

The magnetic survey tool is locked within a non-magnetic collar to ensure interference is not encountered from the steel assembly. Once the tool is locked in place, the angular offset to the reference scribe is recorded. The survey tool records the direction and inclination of the core as it is being cut. This information is matched to the specific depth for each survey taken to identify its position in space. At surface, the depth, inclination and azimuth is recorded along the length of the core according the survey density.

- Reservoir Group