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Large Width Perforated Core Catcher Ring with Diamond Coating

IP.com Disclosure Number: IPCOM000242169D
Publication Date: 2015-Jun-22
Document File: 6 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Abstract

This publication describes a perforated core catcher ring with the purpose to recover core samples from a rock formation. It is used in conjunction with a core sampling tool. The design is intended to be used as a device that will grip around a core during a coring operation, retain the core while it is being severed or removed from the rock formation, and continue to retain the core until it is pushed into a core storage unit.

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TITLE

Large Width Perforated Core Catcher Ring with Diamond Coating

 
SUMMARY

This publication describes a perforated core catcher ring (Figure 1) with the purpose to recover core samples from a rock formation. It is used in conjunction with a core sampling tool. The design is intended to be used as a device that will grip around a core during a coring operation, retain the core while it is being severed or removed from the rock formation, and continue to retain the core until it is pushed into a core storage unit. This core catcher ring (1) is assembled between a coring bit (2) and spacer (3) which are fastened to a coring shaft (4) as shown in Figure 2. The intent of the core catcher ring design is that once it grips onto a core sample, it will no longer have any rotational movement while the coring bit continues to rotate and extend into the rock formation.    

Although other core catcher rings exist, they suffer due to limited wear durability. Wear occurs from the borehole fluid and particles, the core itself, or cutting debris that come in contact with the core catcher ring during a coring operation. The design of existing core catcher rings provide limited to no design features for effectively removing debris from the area. Therefore, debris is able to collect in the area of the core catcher ring. If this happens, the core catcher ring can get jammed with the coring bit and instead of staying stationary in relation to the coring bit, the core catcher ring follows the same rotational motion of the coring bit. This allows for quick wear of the core catcher ring as the core sample is able to grind it down like a grinding wheel, especially when multiple core samples are taken in abrasive formations. Also, many of the existing core catcher rings are not made from materials or coatings that are sufficient to withstand the wear of a typical multiple core operation. Once the core catcher ring has become too worn, it is unable to recover the core sample.  

Installation of existing core catcher rings is also a difficult task. Existing core catcher rings must be maneuvered and pinched in a particular manner to squeeze it into the groove designed into the coring bit. This allows for the core catcher ring to be prone to permanently deform if not installed carefully. Removal of the core catcher ring from the coring bit is usually even more difficult as it requires pinching of the core catcher ring again until it can be pushed out of the groove. Oftentimes, the core catcher ring is bent too much upon removal and is permanently deformed. Though the core catcher ring is meant to be replaced after a full multiple core operation has been completed, deformation of the ring upon removal can affect failure analysis investigation if needed.

This design of a large width perforated core catcher ring aims at significantly increasing durability and ease of assembly. It is designed to increase wear resistance with material and coating improvements along with imp...