Cobra® SP was designed to be the next generation’s semi-premium flush joint connection. Conventional flush joint connections are severely lacking in tensile strength and torque capacity. They’re prone to flared boxes, galled threads, and slow running speeds. Cobra® SP eliminates these issues. Unlike a conventional flush joint connection, the thread flanks serve as the torque stop, removing the need to shoulder externally. Low pitch threads with negative flanks are highly resistant to galling, stab deep and makeup fast. Cobra® SP can be madeup in 5 turns compared to 12 for API BTC. Negative load and stab flanks lock the pin and box together radially, diminishing the potential for jumpout and minimizing local movement within the connection. The results in outstanding integrity under bending, tension, compression, and pressure. A positional makeup indicator allows operators to run without the need for torque-turn monitoring. Micro-clearances within the threads provide a robust seal. Cobra® SP is built to save operators money and time.
Torque, Fatigue Resistance, Compressive Strength
A key drilling contractor in Louisiana contacted Fermata seeking a flush connection which was capable of drilling through several hundred feet of shale. Their plan was to run a 7” liner through a high-pressure reservoir to best position the string to maximize production. The Fermata well services team evaluated the application and established the primary technical concerns: torsion, fatigue, compression, and buckling. 7” x 32# P110 HC Cobra™ SP was chosen as the connection for the application.
Drilling Success
The 7” x 32# P110 HC Cobra™ SP connection was rotated for over 12 hours at 90 rpm. When the operator drilled through the 400’ of shale that they initially targeted, they decided to continue for another 300’ or until they encountered difficulty in drilling. The operator was successfully able to achieve this, putting them in a significantly better position to maximize production.
Casing Running
A non-retrievable drilling shoe was made-up in place of a typical float shoe. The Cobra™ SP connections madeup smoothly with consistent torque vs turn profiles for the entirety of the string. Feedback from the rig hands was that this was one of the fastest, easiest connections to run – they have extensive experience running premium connections from another major mill. Once the string was made-up, it was run down to 11,886’ using drill pipe where the operator began drilling operations.
All material contained in this brochure is for general information only. This material should not, therefore, be used or relied upon for any specific application without independent competent professional examination and verification of its accuracy, suitability and applicability. Fermata Technologies, LLC does not assume any responsibility or liability for any loss, damage, injury resulting from the use of information and data herein.
Reach out to your Fermata™ representative for more information
From casing design to finished OCTG product, we can assist every step of the way!
Contact us and we will consult you in a short time
