Torpedo

Test Your Knowledge

Quiz: The Torpedo

Instructions: Choose the best answer for each question.

1. What is the primary function of the torpedo in electric line logging?

a) To connect the logging cable to the electrical bridle. b) To transmit data from the downhole tools to the surface. c) To provide power to the downhole tools. d) To secure the logging cable to the wellhead.

2. Which of the following is NOT a typical component of a torpedo?

a) Housing b) Contacts c) Cable Entry d) Downhole Tool

3. What is the main advantage of the torpedo's waterproof construction?

a) It prevents the electrical connection from overheating. b) It protects the electrical contacts from corrosion. c) It allows for easier connection and disconnection of the cable. d) It ensures the torpedo can withstand high pressures.

4. How does the torpedo contribute to operational efficiency?

a) It allows for quick and easy connection and disconnection of the cable. b) It reduces the need for specialized personnel. c) It minimizes the risk of data loss. d) It ensures accurate readings from the downhole tools.

5. What is the significance of the torpedo in electric line logging?

a) It enables the efficient and accurate transmission of power and data. b) It reduces the risk of mechanical failure during logging operations. c) It simplifies the connection process, saving time and resources. d) All of the above.

Exercise:

Scenario: You are working on an electric line logging operation. During the process, you encounter a problem with the torpedo connection. The logging cable is not making proper contact with the electrical bridle, resulting in intermittent power and data transmission.

Task: Identify at least three possible causes for this problem and suggest solutions for each.

Techniques

Chapter 1: Techniques for Torpedo Connection and Disconnection

This chapter focuses on the practical techniques involved in connecting and disconnecting the torpedo to the logging cable and electrical bridle. Safety and efficiency are paramount in these procedures.

Connecting the Torpedo:

1. Preparation: Inspect both the torpedo and the logging cable for any damage. Ensure the electrical bridle is clean and free from debris.
2. Alignment: Carefully align the torpedo with the cable and bridle connectors. Misalignment can lead to poor contact and potential damage.
3. Connection: Engage the connection mechanism, typically a threaded connection or a bayonet fitting. Apply firm, even pressure until fully secured.
4. Verification: After connection, visually inspect the connection to ensure it is secure. A continuity test may be necessary to confirm a proper electrical connection.

Disconnecting the Torpedo:

1. Preparation: Before disconnection, ensure the power is off to the logging equipment. This prevents electrical shock and potential damage to components.
2. Disengagement: Carefully disengage the connection mechanism, using the appropriate technique for the specific torpedo design. Avoid applying excessive force.
3. Inspection: Inspect both the torpedo and the logging cable/bridle for any signs of damage after disconnection.
4. Storage: Properly store the torpedo to prevent damage and ensure its longevity.

Troubleshooting:

• Poor Connection: If a poor connection is detected, check for misalignment, debris, or damage to the connectors.
• Connection Failure: If connection fails, check for compatibility issues, mechanical damage, or corrosion.

Safety Precautions:

• Always disconnect power before any connection or disconnection procedure.
• Use appropriate personal protective equipment (PPE), including gloves and safety glasses.
• Be aware of potential hazards associated with high voltages and moving equipment.
• Follow all manufacturer's instructions and company safety procedures.

Chapter 2: Models of Torpedo Connectors

Various torpedo models exist, catering to different logging applications and environments. These models differ in size, connector type, material, and pressure ratings.

Common Torpedo Designs:

• Submersible Torpedoes: Designed to withstand high pressure and harsh underwater environments. Typically made from corrosion-resistant materials like stainless steel.
• High-Temperature Torpedoes: Suitable for operations in high-temperature wells. Employ specialized materials and designs to maintain integrity at elevated temperatures.
• High-Voltage Torpedoes: Constructed to handle high voltage levels safely and reliably. Incorporate enhanced insulation and robust contact designs.
• Quick-Connect Torpedoes: Designed for rapid connection and disconnection, minimizing downtime during logging operations. Often use bayonet or other quick-release mechanisms.

Factors influencing Torpedo Selection:

• Well conditions: Temperature, pressure, and corrosive environment.
• Logging equipment: Compatibility with logging cable and electrical bridle connectors.
• Operational requirements: Connection speed, durability, and maintenance needs.

This chapter would benefit from a table summarizing key specifications for different torpedo models, including manufacturer, model number, pressure rating, temperature rating, voltage rating, connector type, and material.

Chapter 3: Software and Data Acquisition Related to Torpedo Use

While the torpedo itself isn't directly software-controlled, its proper functioning is crucial for accurate data acquisition during electric line logging. This chapter explores the software aspects related to monitoring and ensuring the torpedo's integrity.

Data Logging Software:

• Real-time monitoring: Software systems should monitor the signal integrity from downhole tools through the torpedo connection. Any signal degradation or interruptions should be flagged immediately.
• Data validation: Software should perform checks to ensure data consistency and accuracy, accounting for potential interference or signal noise introduced by a faulty torpedo connection.
• Diagnostics: The software should provide diagnostic tools to identify potential issues with the torpedo connection, such as high resistance or open circuits.
• Calibration: Software will often include calibration routines to ensure the accuracy of the measurements relayed through the torpedo.

Integration with other Systems:

The data from the logging system (which relies on the torpedo's connection) must integrate smoothly with other wellsite and office systems for comprehensive data analysis and reporting.

Chapter 4: Best Practices for Torpedo Handling and Maintenance

This chapter details best practices for ensuring the longevity and reliable performance of torpedo connectors.

Handling:

• Careful Handling: Avoid dropping or impacting the torpedo.
• Cleaning: Regularly clean the torpedo contacts and connectors to remove dirt, debris, and corrosive materials.
• Storage: Store torpedoes in a clean, dry environment, away from moisture and extreme temperatures.
• Inspection: Before each use, carefully inspect the torpedo for any signs of damage or wear.

Maintenance:

• Regular Inspection: Periodically inspect the torpedo for corrosion, wear, and damage to the housing or contacts.
• Contact Cleaning: Clean contacts using appropriate contact cleaner and a soft brush.
• Lubrication: Apply a suitable lubricant to the connection mechanism to ensure smooth operation.
• Replacement: Replace damaged or worn torpedoes immediately.

Preventative Maintenance:

A preventative maintenance schedule should be implemented, detailing regular inspections, cleaning, and lubrication to ensure the torpedo remains in optimal condition.

Chapter 5: Case Studies of Torpedo Failures and Successes

This chapter would present real-world examples highlighting the importance of proper torpedo handling, selection, and maintenance.

Case Study 1: Torpedo Failure due to Corrosion: A case study might describe a scenario where a torpedo failed due to corrosion in a highly corrosive well environment, leading to downtime and costly repairs. This would emphasize the importance of selecting the right torpedo for the specific well conditions.

Case Study 2: Successful Deployment in Challenging Conditions: A case study demonstrating successful logging operations in a high-temperature, high-pressure well using a specialized torpedo. This would showcase the importance of choosing the appropriate torpedo model.

Case Study 3: Impact of Preventative Maintenance: A comparison of two logging projects, one with a robust preventative maintenance program and one without. This would highlight the cost savings and increased efficiency associated with proper maintenance.

These case studies should include details on the specific torpedo model used, the well conditions, the outcome of the operation, and the lessons learned. The inclusion of quantitative data (downtime costs, repair expenses, etc.) would further strengthen these case studies.