How does a wellhead choke valve 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. Under critical flow conditions, the flow rate is a function of the upstream or tubing pressure only.
What is the purpose of the choke valve?
A choke valve is a mechanical device that induces restriction in a flow line, causing either a pressure drop or a reduction in the rate of flow. See Figure 1. In the context of the upstream oil and gas industry, choke valves are used wherever there is a requirement for wellhead flow and pressure control.
How does an automatic choke work?
Automatically – An automatic choke uses a metal spring to open and close the choke plate. The spring is wound in a housing and attached to the choke linkage on one end. As the engine warms up, it warms the metal spring. As the spring warms, it expands, rotates, and opens the choke plate.
What is wellhead choke?
Wellhead chokes are used to limit production rates for regulations, protect surface equipment from slugging, avoid sand problems due to high drawdown, and control flow rate to avoid water or gas coning. Two types of wellhead chokes are used. They are (1) positive (fixed) chokes and (2) adjustable chokes.
What is choke manifold valve?
A choke manifold is an arrangement of piping and valves with adjustable choke valves. In the oil and gas industry, for example, choke manifolds are used to lower pressure from the wellhead to allow retrieved gases to be flared on-site.
Where is the choke manifold located?
Weatherford’s choke manifold is typically located on the rig floor and provides flexible and variable flow control and well shut-in capability upstream of the process and measurement equipment during well test operations.
What is the difference between valve and choke?
As verbs the difference between choke and valve is that choke is to be unable to breathe because of obstruction of the windpipe, for instance food or other objects that go down the wrong way while valve is to control (flow) by means of a valve. As nouns the difference between choke and valve is that choke is a control on a carburetor to adjust the air/fuel mixture when the engine is cold while valve is a device that controls the flow of a gas or fluid through a pipe.
What is a choke valve in oil and gas?
The choke valve in an oilfield heater, wellsite separator, and other oil and gas equipment is similar to the positive choke. It replaces the bonnet assembly and comes with a plug assembly and adjustable rising stem that seats into the bean. This allows the operator to adjust the pressure and flow according to the requirements of the process.
What are choke valves?
Choke Valves. Choke valve is a type of control valves, mostly used in oil and gas production wells to control the flow of well fluids being produced. Another purpose that the choke valves serve is to kill the pressure from reservoir and to regulate the downstream pressure in the flowlines.