Wellhead Chokes Selection

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What is the main purpose of using wellhead chokes?

To limit production rates, protect surface equipment, avoid sand problems, and control flow rate.

What is the difference between positive (fixed) chokes and adjustable chokes?

Positive (fixed) chokes have a fixed orifice, while adjustable chokes have a variable orifice.

How can the flowing bottom-hole pressure be determined for a given wellhead pressure?

By calculating pressure loss in the tubing.

What is the significance of the orifice size in flow control devices?

The larger the orifice, the greater the flow through the valve will be. Signup and view all the answers

What is the relation between orifice size and flow rate when the pressure drop across a valve is fixed?

With a fixed pressure drop, the larger the orifice, the greater the flow will be. Signup and view all the answers

What is the main purpose of a backpressure control valve in pressure control?

To maintain the desired pressure in the vessel by regulating the amount of gas leaving the vapor space. Signup and view all the answers

When might it be necessary to add gas to the vessel for pressure control?

Under conditions where there has been only a small pressure drop from the upstream vessel or when the crude GOR is low. Signup and view all the answers

How does a level controller maintain the gas/liquid or oil/water interface?

By signaling the liquid dump valve to open when the level rises and close when the level falls. Signup and view all the answers

What are the two common forms of level controllers mentioned in the text?

Floats and displacers. Signup and view all the answers

What does a pressure controller sense in the vapor space of the pressure vessel or tank?

The pressure. Signup and view all the answers

Wellhead Chokes Selection

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