Drilling & Well Completion

swivel

The Swivel: A Crucial Component in Drilling Operations

The drilling industry thrives on precision and efficiency, and a critical element in this process is the swivel. This unassuming piece of equipment plays a vital role in connecting the top drive to the drill string, enabling smooth drilling operations.

What is a Swivel?

A swivel is a rotary tool that hangs from the rotary hook and traveling block. Its primary function is to suspend and permit free rotation of the drill stem while it's being lowered into or raised from the wellbore. This crucial ability allows for drilling without twisting or damaging the drill string.

Key Functions of the Swivel:

  1. Rotary Connection: The swivel houses a rotating head that allows the drill string to turn freely. This head is connected to the top drive, which transmits power to the drill bit.
  2. Fluid Flow: The swivel also serves as a passageway for the drilling fluid to flow down the drill string and back up to the surface. The fluid lubricates the drill bit, removes cuttings, and helps control wellbore pressure.
  3. Rotary Hose Connection: The swivel incorporates a connection point for the rotary hose, which carries the drilling fluid from the mud pumps to the drill string.

Components of a Swivel:

A typical swivel consists of the following key components:

  • Rotating Head: This component is connected to the top drive and allows the drill string to rotate.
  • Rotary Hose Connection: A swivel usually has a hydraulic connection for the rotary hose, which allows for flexible movement during drilling.
  • Fluid Passage: The swivel contains a passageway for drilling fluid to flow through to the drill string.
  • Bearing Assembly: This assembly supports the rotating head and allows for smooth rotation of the drill string.
  • Swivel Body: This part houses all the swivel's components and provides a connection point to the rotary hook.

Importance of the Swivel:

The swivel is an essential component in drilling operations, ensuring:

  • Efficient Drilling: The ability of the swivel to allow free rotation of the drill string enables efficient drilling.
  • Fluid Circulation: The swivel facilitates the circulation of drilling fluid, which is vital for drilling and wellbore stability.
  • Safety: The swivel helps prevent twisting and damage to the drill string, promoting safe drilling operations.

Conclusion:

The swivel is an often overlooked but crucial element in the complex process of drilling and well completion. Its ability to connect, rotate, and provide fluid passage allows for seamless drilling operations. Understanding its functions and components is essential for anyone involved in the drilling industry.

Test Your Knowledge

Swivel Quiz:

Instructions: Choose the best answer for each question.

1. What is the primary function of a swivel in drilling operations?

a) To connect the drill string to the mud pumps b) To provide a connection point for the top drive c) To suspend and allow free rotation of the drill string d) To control wellbore pressure

Answer

c) To suspend and allow free rotation of the drill string

2. Which of the following is NOT a key component of a swivel?

a) Rotating head b) Rotary hose connection c) Mud motor d) Bearing assembly

Answer

c) Mud motor

3. What is the role of the fluid passage in a swivel?

a) To prevent the drill string from twisting b) To allow drilling fluid to circulate through the drill string c) To connect the swivel to the rotary hook d) To provide lubrication for the rotating head

Answer

b) To allow drilling fluid to circulate through the drill string

4. How does the swivel contribute to efficient drilling operations?

a) By controlling the flow rate of drilling fluid b) By providing a strong connection between the drill string and the top drive c) By enabling the drill string to rotate freely without twisting d) By preventing the drill string from becoming entangled in the wellbore

Answer

c) By enabling the drill string to rotate freely without twisting

5. Which of the following is NOT a benefit of using a swivel in drilling operations?

a) Improved wellbore stability b) Increased drilling speed c) Reduced risk of drill string damage d) Elimination of the need for drilling fluid

Answer

d) Elimination of the need for drilling fluid

Swivel Exercise:

Instructions: Imagine you are working on a drilling rig and need to connect the swivel to the top drive. Describe the steps you would take to ensure a safe and correct connection. Include the importance of checking for any potential issues before and during the connection process.

Exercice Correction

Here are the steps involved in safely connecting a swivel to a top drive:

  1. Safety First: Ensure the area around the swivel and top drive is clear of personnel and obstructions.
  2. Visual Inspection: Before connecting, inspect the swivel and top drive for any visible damage or wear. Check for leaks, loose connections, or any other potential problems.
  3. Rotary Hose Connection: Align the swivel's rotary hose connection with the rotary hose coming from the mud pumps. Ensure a secure and leak-free connection.
  4. Top Drive Connection: Carefully align the swivel's rotating head with the top drive's coupling. Check the alignment and ensure a smooth and secure connection.
  5. Torqueing: Tighten the connection bolts to the recommended torque specifications using a torque wrench. Avoid overtightening, as this can damage the components.
  6. Leak Check: After making the connections, conduct a thorough leak check for both the fluid passage and the rotary hose connection. Use appropriate leak detection equipment and correct any leaks immediately.
  7. Final Inspection: Once the connections are secure and leak-free, perform a final inspection to confirm everything is in good working order.

Important Considerations:

  • Wear and Tear: Always check the swivel and top drive for signs of wear and tear. Replace or repair damaged components before they pose a safety risk.
  • Leaks: Any leaks in the swivel or rotary hose connection can lead to loss of drilling fluid, environmental damage, and potential safety hazards. Address them immediately.
  • Lubrication: Make sure the swivel's bearings are properly lubricated for smooth operation and reduced wear.
  • Communication: Maintain clear communication with all personnel involved in the connection process to ensure everyone is aware of their responsibilities and potential hazards.

By following these steps and paying attention to these considerations, you can ensure a safe and reliable connection between the swivel and the top drive, contributing to a smooth and successful drilling operation.

Books

  • Drilling Engineering: A Comprehensive Textbook by M.E. Economides and K.G. Nolte - This textbook provides a comprehensive overview of drilling operations, including detailed information on swivels and their functions.
  • Petroleum Engineering Handbook by G.C. Howard and W.L. Viar - This comprehensive handbook covers a wide range of topics in petroleum engineering, including drilling equipment and techniques. It provides insights into the significance of swivels in drilling operations.
  • Drilling and Well Completion by J.E. Spath and B.P. Leatham - This book focuses on the practical aspects of drilling and well completion, including a dedicated section on drilling equipment like swivels.

Articles

  • "Swivel Design and Operation" by (Author Name) - Search for articles from industry journals like SPE (Society of Petroleum Engineers), IADC (International Association of Drilling Contractors), or other drilling-related publications. These articles often delve deeper into the technical aspects of swivel design and operation.
  • "Swivel Failure Analysis" by (Author Name) - Look for articles that analyze common swivel failures, their causes, and preventative measures. These articles provide valuable insights into the importance of maintaining and inspecting swivels.
  • "Advances in Swivel Technology" by (Author Name) - Explore articles about recent innovations in swivel design, materials, and functionality. This can offer a glimpse into the future of swivel technology in drilling operations.

Online Resources

  • SPE (Society of Petroleum Engineers) website: https://www.spe.org/ - This website offers a vast library of technical resources, including articles, presentations, and publications related to drilling and well completion.
  • IADC (International Association of Drilling Contractors) website: https://www.iadc.org/ - This website provides resources and information on drilling industry practices, including information on drilling equipment like swivels.
  • Drillinginfo: https://www.drillinginfo.com/ - This platform offers comprehensive data and analysis on the drilling industry, including technical specifications of various drilling equipment.
  • Manufacturer Websites: Explore websites of major oilfield equipment manufacturers like Cameron, Baker Hughes, and Schlumberger. These websites usually provide technical information on their swivel products.

Search Tips

  • Use specific keywords: Use combinations of terms like "swivel," "drilling," "oilfield," "equipment," "components," "functions," "design," and "operation."
  • Add location or industry: Include terms like "US," "UK," "onshore," or "offshore" to narrow down your search.
  • Explore academic databases: Use search engines like Google Scholar or JSTOR to find peer-reviewed research articles.
  • Check online forums: Search online forums related to drilling or oilfield operations for discussions and expert opinions on swivels.

Techniques

Similar Terms
Drilling & Well Completion
Most Viewed

Comments

No Comments
POST COMMENT
captcha
Back