Advanced Coring

Our advanced coring services have evolved – and continue to evolve – because we know that core quality is key to shaping operational plans and investment.

They comprise tools, technologies and techniques that take coring to a new level of excellence, and meet the standards demanded by the modern-day industry.

TSS Core Barrels™ Assembly

 

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TSS Core Barrels™ Information

TRIPLE-TUBE TSS SYSTEM

Advanced Core Barrel Technology                                                                                                                                                                                                                                                                                                                        

The Triple-Tube TSS corebarrel forms the basis of our barrel system that incorporates an innovative three-barrel system compared to traditional inner/outer barrel systems. TSS eliminates thermal expansion issues, improves core quality through ease of handling, and provides a platform to enhance wellsite processes and core analysis. The TSS includes two components, a threaded steel jacket and a disposable liner in which the core is housed. The presence of two independent tubes allows the disconnection process to take place without transmitting the torque to the core, therefore without inducing any rotation core damage.


The liners are made of aluminium or fiberglass and can be upgraded for enhanced coring services. The liners ease the core entry due to lower friction compared to conventional steel inner barrels. Each material offers the best compromise between structural integrity, temperature rating, friction coefficients, and cost. Corpro® provides the following liner options which are further described below:


• Half-Moon Liners for core visualization
• On-Ice Half-Moon Liners for reduced jamming and core visualization
• Aluminum Liners
• Fiberglass Liners

 

 

Soft Pro™ Assembly

Soft Pro™ Information

Unconsolidated formations present the risk for the core to slide out of the inner tube during the trip to surface.

Purposely designed equipment is required to fully close the inner tube in situations where a spring core catcher will not suffice. Our Soft-Pro™ technology utilizes a proprietary upper head and a full closure lower shoe to achieve this easily downhole.

The full closure shoe is available in two configurations; Soft-Catch and the Orenoc Shoe.  Soft catch contains a cage/basket style catcher which collapses in the center. Once Soft-Pro™ is activated, the core is caught by a basket which forms at the bottom of the core. This system suffices in most unconsolidated, offshore applications. The Orenoc shoe is an inverted clam shell which closes completely when activated. The shells pinch together and secure the core. The Orenoc shoe has applications in highly unconsolidated formations such as heavy oil sands where there is virtually no mechanical structure and the core is held primarily by the viscous reservoir fluids.

Orenoc ShoeSoft Catch Shoe

Soft-Pro™ utilizes a hydraulic, dual-bearing upper head called the Gyro-Head. The Soft-Pro Gyro Head is an innovative upper head design which allows the inner barrel to rest freely within the outer barrel, ensuring total independence between the inner and outer barrels. The design incorporates dual bearings in the upper head allowing the inner barrel to remain static while the outer barrel rotates. Additionally, the Gyro Head provides the hydraulic mechanism to activate the full closure shoe. Combined with the lower bearing of the core head, the Soft-Pro system delivers the necessary stability to both cut and retain core in challenging environments.

The Soft-Pro™ design pioneers a consistent and reliable full closure mechanism to retain unconsolidated core. The system is activated hydraulically and is not sensitive to pressure fluctuations like other systems. The activation cell, located in the Gyro Head, utilizes a sealed column of hydraulic fluid which holds the weight of the inner barrel during normal coring procedures. When it is time to activate the full closure shoe, a ball is dropped to vent the oil column which supports the TSS inner tube above the lower shoe.  The TSS inner barrel is then free to move down and activate the full closure shoe. Within the shoe, either a basket catcher or inverted clamshells close and trap the core inside the barrel. As a backup, a spring catcher is included to ensure a successful recovery in the instance a harder formation is encountered.

Mag-Pro™ Assembly

Mag-Pro™ Information

Our Mag-Pro™ system provides the geometrical orientation of the core within the reservoir by recording the cores 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, the strike angle, formation anisotropy, and stress direction. An understanding of the parameters allow for better exploitation of the resource.

Mag-Pro™ is specially configured with the Corpro® sealed bearing unit to reduce the occurrence of inner barrel rotation. The survey tool is positioned directly below the upper head and sealed bearing unit.  The system allows full circulation to flush the inner tube prior to coring via the use of our Fast Ball Sub. The core barrels are tripped to bottom as normal with mud flow cleaning the inner barrel. Once on bottom, the Fast Ball Sub is hydraulically activated to divert flow to the annulus. The use of Mag-Pro™ provides enhanced core quality by reducing the chances of inner barrel rotation.

Mag-Pro™ 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 outer barrel and inner barrel configuration to ensure interference is not encountered from the steel assembly. The Mag-Pro™ system also provides an automatic locking and latching mechanism to positively lock the survey tool in place, thus protecting the tool from mechanical and hydraulic disturbances which falsify orientation computations. 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.

The Corpro® Mag-Pro™ system provides reliable core orientation and ensures that the survey tool will not back-off in any coring condition, including highly deviated and horizontal applications. In combination with the 'EMS' electronic survey system, oriented coring proceeds like standard coring without interruptions for surveys. Surveys are continuously recorded at a specified time frequency.

With Mag-Pro™, one can take full advantage of the Corpro® systems to ensure core quality and rig time efficiency.

 

Orient Pro™ Assembly

Orient Pro™ Information

The Corpro® Orient-Pro™ system provides the geometrical orientation of the core within the reservoir by recording the cores 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.

Orient-Pro™ 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. The Orient-Pro™ system also provides a locking and latching mechanism to positively lock the survey tool in place, thus protecting the tool from mechanical and hydraulic disturbances which falsify orientation computations. 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.

The Orient-Pro™ system from Corpro provides reliable core orientation and superior operational advantages. The system allows full circulation to flush the inner tube prior to coring via the use of Corpro’s Fast Ball Sub. The core barrels are tripped to bottom as normal with mud flow cleaning the inner barrel. Once on bottom, the Fast Ball Sub is hydraulically activated to divert flow to the annulus.

The Corpro Orient-Pro™ system ensures the survey tool will not back-off in any coring condition, including highly deviated and horizontal applications. In combination with the 'EMS' electronic survey system, oriented coring proceeds like standard coring without interruptions for surveys. Surveys are continuously recorded at a specified time frequency.

Gas Trapper™ Assembly

Gas Trapper™ Information

While tripping the core to surface, gases escape from the core toward the annulus. Identifying these gases can be a valuable source of information in regards to safety and better characterization of the reservoir hydrocarbons.

Gas Trapper™ allows a rapid and safe assessment of eventual gas presence as well as to identify the composition of the gases themselves. The technology is made possible with Corpro’s Thin Sleeve System (TSS) which employs a concentric, triple tube core barrel configuration. The escaping gas is channelled between the liner and the TSS inner tube.  As the gas migrates toward the top of the barrel, a special trapping device collects the gas.

The gas collection chamber is created between an extended ball seat and the inner tube extension. This “gas chamber” has a capacity of several litres and any excess gas will escape via the ball seat as in a normal barrel configuration.   When pulling the barrel out of the hole, a valve mechanism incorporated in the system will close the chamber when the hydrostatic pressure reaches two bars.

On surface, a special gas cylinder is connected to the top of the inner head and all trapped gas is safely recovered from the chamber and captured for analysis. A small sample can also be collected using a special syringe and the gas can be immediately analyzed from a nearby Chromatograph. H2S presence is the first concern.  If identified, the core recovery procedure can be conducted with the appropriate safety equipment and procedures.

The gas cylinders are then shipped to a geochemical lab for further gas analysis. Corpro provides these sealed containers as well as the management of the gas analysis in the absence of convenient laboratory facilities.

Liquid Trapper™ Assembly

Liquid Trapper™ Information

Liquid Trapper™ provides the means to accurately determine oil saturation. A quality core is vital to proper analysis but contains a shortcoming in accurate determination of fluid types and volume for quantifying residual oil volumes.  During the core pull out trip to surface, the hydrostatic pressure decreases gradually allowing gas to come out of solution inside the core. During its escape from the core, expanded gas drives the formation fluids expelling oil and/or water out of the core’s pore spaces. Using standard core barrels, the expelled core fluids are completely lost and cannot be used to properly quantify fluid parameters.

This issue has always been considered a shortfall of conventional coring techniques particularly in situations where oil or water saturations are critical. The industry has made many attempts to overcome this challenge but the technologies developed so far have failed to provide a reliable, cost-effective solution. Liquid Trapper™ technology overcomes the challenge and provides the means to contain the expelled fluid for further analysis and quantification.

Liquid Trapper™ technology is designed to trap fluids escaping from the core on its assent from the wellbore. The technology is applicable where the identification of pore fluid type and volumes are critical.  The most obvious cases include secondary and tertiary recovery projects.  A sample of the fluid is collected with one meter resolution. The fluid volume is directly measured on site and the sample can be sent for compositional analysis.

As pressure drops during the trip to surface, gas is liberated from the oil and expands in accordance with Boyle’s law. The gas drives out a portion of all liquids present in the core depending on reservoir properties and fluid characteristics.  The liberated fluids flow freely out of the core and disappear within the mud system in traditional systems. Liquid Trapper™ captures these fluids for volume quantification and further analysis.

The Liquid Trapper™ consists of a specifically designed liner assembly which utilizes an inflatable seals which “trap” the liquids escaping from the core. The Liquid Trapper™ inner tube system may be pre-saturated with a selected fluid before it is run in hole. This saturating-fluid is selected depending on the information targeted from the core. The saturating fluid can eventually be doped using a mud tracer and is maintained inside the inner tube using a ceramic plug. The plug disintegrates once the assembly reaches bottom. Coring proceeds as normal and the saturation fluid reduces mud contamination of the core inside the inner tube.

The inner tube of the Liquid Trapper™ consists of stacked, one meter modules which represent closed ‘cells’. Once activated, these cells provide a barrier around the core via innovative seal joints which impede fluid movement.   The captured fluids separate naturally based on their specific gravity. The seals will allow core gases to escape upward, thus eliminating a trapped-gas hazard at surface.

Within the closed cells, fluids expelled from the core are trapped in the annulus between the inner and outer cell wall.  On recovery, the core is laid down normally using proper core cradles.  The Liquid Trapper™ cells are cut into 1m sections between the individual seals. The trapped fluid is recovered and the core is readied for transport as normal.

In the lab, the fluids are analyzed.  Whole core analyses are conducted and actual material balance is re-built, based on core and fluid volumes. The collected oil (or water) bleeding from the core is reconstituted into the core porosity to correct the fluids saturation for bleeding. The combined amount of oil in the core and Liquid Trapper™ is converted to in-situ conditions by applying the current oil formation volume factor while pore volume is adjusted for compaction using the stress correction factor.

iCore® Assembly

iCore® Information

Seeing is believing - Redefining the economics of formation evaluation.

The crux of coring is to understand what happens inside the barrel during the core cutting process. This primarily concerns the ability to identify core jamming which can be difficult to detect from the surface. As a result, it can jeopardise the quality and the recovery of the core sample.

With the introduction of iCore®, Corpro® is moving towards trouble-free coring runs with improved recovery and core value. Furthermore, by analysing what is happening downhole, iCore® offers the opportunity to optimise barrel length and maximise quality recovery. This totally redefines the economics of formation evaluation through coring.

iCore® is a major breakthrough in the coring industry.

Until now, it was difficult for coring engineers to fully evaluate the impact of coring parameters on the core. iCore® provides the solution needed to fine tune their approach. With well geometries becoming more complex and operating costs continuing to grow, iCore® offers operators the solution to maximise coring efficiency as well as core quality.

iCore® is a significant game changer in the world of formation evaluation. By understanding what is happening inside the barrel and offering a substantial cost-effective solution, coring system designs and operating procedures will be improved and subsequently, run length will be extended, making coring an increasingly viable and economic formation evaluation technology.

QuickCapture™

QuickCapture: 100% of all in-situ gases &  liquids – a clear picture of reservoir productivity.

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