Changes

[[:file:surface-production-equipment_fig1.png|Figure 1]] shows a typical wellhead for a flowing well. Notice that a choke is provided to control the rate of production from the well in addition to the tubing wing valve, which provides for a complete shut-off of the production. The choke can be either fixed or variable in size. The choke is nothing more than a small orifice, usually from 1/8 to 3/4 in. in diameter, that restricts the flow rate.

[[:file:surface-production-equipment_fig1.png|Figure 1]] shows a typical wellhead for a flowing well. Notice that a choke is provided to control the rate of production from the well in addition to the tubing wing valve, which provides for a complete shut-off of the production. The choke can be either fixed or variable in size. The choke is nothing more than a small orifice, usually from 1/8 to 3/4 in. in diameter, that restricts the flow rate.

[[file:surface-production-equipment_fig1.png|thumb|{{figure number|1}}Typical wellhead for a flowing well with a single-wing, single-completion threaded manifold.]]

[[file:surface-production-equipment_fig1.png|thumb|300px|{{figure number|1}}Typical wellhead for a flowing well with a single-wing, single-completion threaded manifold.]]

Other valves are present on the side of the wellhead. These are called ''casing valves'' and they provide access to the various annulii between casing strings and tubing. Normally, the wellhead is fitted with pressure gauges for monitoring pressure within the different annulii and in the tubing.

Other valves are present on the side of the wellhead. These are called ''casing valves'' and they provide access to the various annulii between casing strings and tubing. Normally, the wellhead is fitted with pressure gauges for monitoring pressure within the different annulii and in the tubing.