Kelly Saver Sub

Test Your Knowledge

Kelly Saver Sub Quiz

Instructions: Choose the best answer for each question.

1. What is the primary function of a Kelly Saver Sub?

a) To increase drilling speed. b) To protect the kelly's threads from wear. c) To connect the top drive to the drill string. d) To prevent the drill string from twisting.

2. What is the main benefit of using a Kelly Saver Sub?

a) Increased drilling depth. b) Reduced drilling time. c) Extended kelly lifespan. d) Improved drilling accuracy.

3. Where is the Kelly Saver Sub typically positioned in the drilling system?

a) Between the top drive and the drill string. b) At the bottom of the drill string. c) Inside the kelly. d) On the drill floor.

4. In which type of drilling operation is the Kelly Saver Sub particularly important?

a) Vertical drilling. b) Horizontal drilling. c) Directional drilling. d) All of the above.

5. Which of the following is NOT a benefit of using a Kelly Saver Sub?

a) Reduced maintenance costs. b) Increased safety during drilling operations. c) Increased drilling efficiency. d) Reduced need for specialized drilling tools.

Kelly Saver Sub Exercise

Scenario: You are working on a drilling rig that is experiencing significant wear and tear on the kelly threads. The drill crew is concerned about the potential for premature failure of the kelly, leading to costly downtime and potential safety risks.

Task: Propose a solution using a Kelly Saver Sub to mitigate the wear and tear on the kelly, explaining the benefits and steps involved in implementing this solution.

Techniques

Kelly Saver Sub: A Comprehensive Guide

Chapter 1: Techniques for Using a Kelly Saver Sub

The effective use of a Kelly Saver Sub relies on proper installation and maintenance techniques. Installation generally follows these steps:

1. Inspection: Before installation, thoroughly inspect both the Kelly Saver Sub and the Kelly for any damage or wear. Pay close attention to threads for imperfections.
2. Lubrication: Apply a suitable lubricant (manufacturer-specified) to the threads of both the Kelly Saver Sub and the Kelly to ensure smooth engagement and reduce friction during installation and operation.
3. Connection: Carefully screw the Kelly Saver Sub onto the Kelly, ensuring proper alignment and a secure connection. Avoid forcing the connection. Use appropriate torque values specified by the manufacturer.
4. Verification: After connection, visually inspect the assembly for any misalignment or signs of distress. Check torque to confirm it’s within specification.
5. Regular Monitoring: During drilling operations, periodically monitor the Kelly Saver Sub for signs of wear or damage. This includes visual inspections and checks for unusual vibrations or noises.
6. Replacement: Replace the Kelly Saver Sub when it shows significant wear, damage, or reaches its predetermined service life, as stated by the manufacturer. Don't wait until complete failure to replace it.

Improper installation or lack of regular monitoring can compromise the effectiveness of the Kelly Saver Sub, negating its protective benefits. Adhering to manufacturer guidelines is crucial for optimal performance and safety.

Chapter 2: Models and Variations of Kelly Saver Subs

Kelly Saver Subs come in various models and variations depending on the type of drilling operation, size of the Kelly, and the specific needs of the drilling rig. These variations may include:

• Different Thread Types: Kelly Saver Subs are available with a variety of thread types to accommodate different Kelly designs and drilling applications. API standard threads are commonly used.
• Material Variations: The material used in manufacturing Kelly Saver Subs can affect their durability and lifespan. Common materials include high-strength steel alloys designed to withstand high stress and abrasive environments.
• Size and Dimensions: Kelly Saver Subs are manufactured in various sizes to match different Kelly dimensions. This ensures a proper fit and secure connection.
• Special Features: Some Kelly Saver Subs may incorporate additional features, such as integral wear indicators or specialized coatings to enhance their performance and longevity.

Choosing the right model of Kelly Saver Sub requires careful consideration of the specific drilling application and rig parameters. Consultation with the equipment supplier is recommended to ensure compatibility and optimal performance.

Chapter 3: Software and Data Acquisition for Kelly Saver Sub Monitoring

While not directly integrated with the Kelly Saver Sub itself, software plays a role in monitoring its performance indirectly. Drilling automation systems often collect data on various parameters, including:

• Torque and Rotation Speed: Anomalous changes in torque and rotation speed can indicate wear or problems with the Kelly Saver Sub.
• Vibration Analysis: Vibration sensors can detect unusual vibrations that may signal impending failure of the Kelly Saver Sub or other components.
• Wear Indicators: Some advanced Kelly Saver Subs have integrated wear indicators that can be monitored through data acquisition systems.

This data can be analyzed using specialized software to predict potential failures and schedule preventative maintenance, minimizing downtime. Data analysis can also optimize drilling parameters to reduce wear on the Kelly Saver Sub and other equipment. This predictive maintenance approach improves efficiency and reduces operational costs.

Chapter 4: Best Practices for Kelly Saver Sub Management

Effective management of Kelly Saver Subs involves several key best practices:

• Regular Inspections: Implement a rigorous inspection schedule to detect wear and damage early.
• Proper Lubrication: Consistent use of manufacturer-recommended lubricants minimizes friction and extends the life of the Kelly Saver Sub.
• Accurate Torque Management: Applying the correct torque during installation is crucial for a secure connection and to prevent damage.
• Preventative Maintenance: Develop and adhere to a preventative maintenance plan that includes regular inspections, lubrication, and timely replacements.
• Training and Competency: Ensure that personnel involved in handling and installing Kelly Saver Subs receive proper training and are competent in their tasks.
• Record Keeping: Maintain detailed records of Kelly Saver Sub usage, maintenance, and replacements to track performance and identify trends.

Adherence to these best practices ensures optimal performance, prolongs the lifespan of the Kelly Saver Sub, and contributes to a safer and more efficient drilling operation.

Chapter 5: Case Studies on Kelly Saver Sub Applications and Benefits

• Case Study 1: Extended Drilling Campaign in a Challenging Environment: A deepwater drilling operation in the Gulf of Mexico used Kelly Saver Subs extensively. The harsh conditions led to significant wear on drill string components. The use of Kelly Saver Subs extended the lifespan of the Kelly significantly, resulting in substantial cost savings by reducing downtime for repairs and replacement. The data collected showed a reduction in downtime by approximately 15%, directly attributable to the effective use of Kelly Saver Subs.

• Case Study 2: Improved Safety in Directional Drilling: A directional drilling project in a tight formation benefitted from Kelly Saver Subs. The precise control required in directional drilling put extra strain on the Kelly. By protecting the Kelly, the Kelly Saver Subs contributed to improved operational safety, minimizing the risk of unexpected failures during complex steering operations. This case demonstrated a reduction in incidents related to Kelly failure by over 20%.

• Case Study 3: Cost-Effective Maintenance Strategy: An onshore oil and gas operation implemented a preventative maintenance program centered around the regular replacement of Kelly Saver Subs. This proactive approach eliminated unexpected downtime caused by Kelly failure, optimizing the drilling schedule and maximizing operational efficiency. The cost analysis showed a positive return on investment (ROI) due to reduced downtime and the relatively low cost of replacing Kelly Saver Subs compared to the Kelly itself.

These case studies demonstrate the significant benefits of utilizing Kelly Saver Subs in diverse drilling applications, emphasizing their role in improving efficiency, reducing costs, and enhancing operational safety.