Using coil tubing in stuck wells is an effective method for retrieving stuck equipment and maintaining well integrity. Here’s a comprehensive guide on how coil tubing is used in such operations:
Coil Tubing Operations in Stuck Wells:
- Assessment and Planning:
- Identify the Issue: Determine the exact location and nature of the stuck equipment.
- Develop a Plan: Create a detailed plan for the operation, including the selection of appropriate coil tubing tools and safety measures.
- Tool Selection:
- Coil Tubing: Choose the right size and type of coil tubing based on the well conditions.
- Fishing Tools: Select appropriate fishing tools, such as spears, overshots, or jars, depending on the type of obstruction.
- Deployment:
- Insert Coil Tubing: Lower the coil tubing into the wellbore until it reaches the stuck point. Coil tubing’s flexibility allows it to navigate through complex well paths.
- Engage Fishing Tool: Attach the fishing tool to the coil tubing and engage the stuck equipment. Ensure the tool is securely latched onto the obstruction.
- Retrieval:
- Apply Mechanical Force: Use the coil tubing to apply mechanical force to free the stuck equipment. This may involve jarring or pulling actions.
- Use Hydraulic Pressure: If necessary, use hydraulic pressure to aid in freeing the stuck equipment. The coil tubing unit can generate the required pressure to assist in the retrieval process.
- Retrieve Equipment: Carefully retrieve the coil tubing and the attached fishing tool along with the freed equipment to the surface.
Benefits of Using Coil Tubing:
- Flexibility: Coil tubing can easily navigate through deviated and horizontal wellbores, making it ideal for complex well paths.
- Continuous Operation: Unlike traditional drill pipe, coil tubing provides continuous operation without the need for connections, reducing downtime.
- Quick Deployment: Faster deployment and retrieval compared to traditional methods, leading to more efficient operations.