What is choking in oil and gas?

Most oil and gas production facilities use a device known as a choke to control the flow of fluids produced from wells. Typically, equipment such as the line heaters and wellsite separators contain a choke. It has a small opening called a choke bean, which helps to reduce the pressure as the liquids flow through it.

What is choke size in oil and gas?

Tracie, this is a layman’s definition but Choke refers to a mechanical device placed in the flow line to restrict and control the flow of gas. It is usually expressed in 64ths of an inch on fixed chokes or it can be a decimal value on adjustable chokes. A 64/64 choke would be full open flow.

What is the purpose of choke valve?

A choke valve is sometimes installed in the carburetor of internal combustion engines. Its purpose is to restrict the flow of air, thereby enriching the fuel-air mixture while starting the engine.

Where is choke located in drilling?

1. n. [Drilling] A high-pressure pipe leading from an outlet on the BOP stack to the backpressure choke and associated manifold. During well-control operations, the fluid under pressure in the wellbore flows out of the well through the choke line to the choke, reducing the fluid pressure to atmospheric pressure.

What is choke and types?

Choke valve, sometimes also known as ‘choker valve’ is a type of control valve, mostly used in oil and gas production wells to control the flow of well fluids being produced. The reservoir fluids can contain sand particles. Hence the choke valves are usually designed to handle an erosive service.

What is choking in piping?

Choked flow is a fluid dynamic condition associated with the venturi effect. When a flowing fluid at a given pressure and temperature passes through a constriction (such as the throat of a convergent-divergent nozzle or a valve in a pipe) into a lower pressure environment the fluid velocity increases.

What is a choke performance?

Choke Performance Placing a choke at the wellhead means fixing the wellhead pressure and thus the flowing bottom-hole pressure and production rate. For a given wellhead pressure, by calculating pressure loss in the tubing the flowing bottom-hole pressure can be determined.

How does a choke valve work oil and gas?

Choke valve, sometimes also known as ‘choker valve’ is a type of control valve, mostly used in oil and gas production wells to control the flow of well fluids being produced. Choke valves allow fluid flow through a very small opening, designed to kill the reservoir pressure while regulating the well production.

What is choke drill?

With pressure trapped below a closed preventer, the choke should be used to control casing pressure while pumping down the drill pipe at a prescribed rate. This drill will establish equipment performance and allow the crew to gain proficiency in choke operation.

What are the causes of choking?

Choking occurs when a piece of food, an object, or a liquid blocks the throat. Children often choke as a result of placing foreign objects into their mouths. Adults can choke from breathing in fumes or eating or drinking too rapidly.

Why do we use choke valves in oil and gas wells?

The reservoir fluids can contain sand particles. Hence the choke valves are usually designed to handle an erosive service. Typically oil and gas producing wells have two choke valves in series, one non-regulating choke valve and one regulating choke valve downstream to the non-regulating choke valve.

What is a wellhead choke and how does it work?

A wellhead choke controls the surface pressure and production rate from a well. Chokes usually are selected so that fluctuations in the line pressure downstream of the choke have no effect on the production rate. This requires that flow through the choke be at critical flow conditions.

What are the critical flow conditions for a choke?

This requires that flow through the choke be at critical flow conditions. Under critical flow conditions, the flow rate is a function of the upstream or tubing pressure only. For this condition to occur, the downstream pressure must be approximately 0.55 or less of the tubing pressure.

What is a regulating choke valve?

Regulating choke valve is an automatic valve and valve opening can be controlled via electric or pneumatic signal from the control panel to regulate the flow in downstream flowlines. Among other applications, choke valves can be used liquid lines operating at very high pressures.