my Summary choke manifold

Here’s a summary of Choke manifold in oil wells
1. : It is used to control the fluid from the well by reducing the flowing pressure and by achieving a constant flowrate before the fluid enters the processing equipment at surface. As what happens in critical-flow.
2. It consists of:
   • Four gate valves
   • A fixed choke
   • An adjustable choke to control the flow without any interruption
   • Tapping points / sample points on upstream and downstream of the choke
   • Thermometric well to measure well temperature.
3. Its functions:
   • Safety by controlling the well pressure.
   • It allows different choke sizes to control the flow rate
   • It prevents water and gas coning by limiting the flow rate
   • It prevents formation sand from entering the well by limiting the flow rate.
   • It ensures critical flow where the pressure fluctuations downstream of the choke do not affect downhole pressure and flow rate of the well.

4. Changing from adjustable to fixed choke:

   • Preparation of fixed choke box by
     1. adjusting the adjustable choke until the flow stabilizes
     2. Prepare the equivalent fixed choke to be installed
   • Pressurizing fixed choke box.
     1. Open the downstream valve of the fixed side to equalizing pressure.
   • Diverting the flow from adjustable to the fixed side.
     1. Open simultaneously the upstream valve of the fixed choke while closing the upstream valve of adjustable side.
   • Flow through the fixed choke side.
     1. Close the downstream valve of adjustable side.
     2. Bleed off the adjustable choke side.
5. Different types of choke manifold according to:
   • Working pressure
   • Types of gate valve.

Q&A Summary

Here’s a summary of Choke manifold in oil wells
1. . Q: What is the main function of a choke manifold in well testing?

   Answer: A: It controls the flow rate and pressure of fluids from the wellhead, ensuring stable flow conditions before the fluid enters surface processing equipment..

2. . Q: Where is the choke manifold located in the well testing setup?

   Answer: A: It is located downstream of the flow head..

3. . Q: What is "critical flow" and why is it important in choke manifolds?

   Answer: A: Critical flow occurs when changes in downstream pressure no longer affect the upstream pressure and flow rate. It is essential for accurate and stable well testing..

4. . Q: What are the main components of a choke manifold?

   Answer:

   • Four gate valves
   • Fixed choke box (for inserting calibrated choke beans)
   • Adjustable choke
   • Pressure tapping points (upstream and downstream)
   • Thermowell for fluid temperature measurement

5. . Q: What is the purpose of having both a fixed and an adjustable choke?

   Answer: A: The combination allows for maximum control and flexibility. The adjustable choke enables on-the-fly control, while the fixed choke offers stable, pre-set flow control..

6. . Q: How is the flow diverted from an adjustable choke to a fixed choke?

   Answer:

   • Stabilize the flow and prepare the fixed choke.
   • Open the downstream valve on the fixed side to equalize pressure.
   • Open the upstream valve on the fixed side while closing the upstream valve on the adjustable side.
   • Close the downstream valve on the adjustable side and bleed pressure off.

7. . Q: What safety features does the choke manifold provide?

   Answer:

   • Controls wellhead pressure
   • Limits flow to prevent water/gas coning and sand production
   • Allows pressure regulation without stopping flow

8. . Q: What pressure ratings are available for choke manifolds?

   Answer: A: They are commonly available in 5000, 10,000, and 15,000 psi ratings..

9. . Q: What types of valves are used in choke manifolds?

   Answer: A: Valves from brands like McAvoy, Marlbrank, Ceric, and WOM are commonly used..

10. . Q: Why is the downstream valve opened first when equalizing pressure?

    Answer: A: It is a safety measure to avoid sudden pressure surges and ensure smoother pressure balancing..

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