Wellhead equipment is used to connect the tubing and casing to an oil or gas pipeline. The casing is a permanently-installed pipe for lining the well hole to provide pressure containment and prevent collapse. The wellhead is a flanged device that attaches to the casing. It is used to suspend the casing strings and help seal the well.
Components of Wellhead Equipment
An oil or gas wellhead typically includes several different components, including:
- Casing head: This is the component that sits on top of the well casing and provides a seal between the casing and the tubing or production equipment.
- Tubing head: This is the component that sits on top of the well tubing and provides a seal between the tubing and the production equipment.
- Valves: These are used to control the flow of oil or gas from the well, and include safety valves, blowout preventers, and production valves.
- Fittings: These are used to connect the wellhead to the production equipment and include flanges, tees, and elbows.
- Choke and Kill lines: These are used to control the pressure of the well and to inject fluids into the well.
- Christmas Tree: A Christmas tree is a set of valves, spools, and fittings that are installed on top of a wellhead to control the flow of oil or gas.
- Wellhead control panel: This is used to control the valves and fittings on the wellhead, and to monitor the pressure and flow of the well.
- Annulus Vent Flow (AVF) line: It is used to vent the pressure from the annulus space of the well.
- Wellhead adapter spool: It is used to connect the wellhead with the flowline.
- Wellhead connector: It is used to connect the wellhead with the surface production facility.
Basic Requirements
Basic requirements for materials, dimensions, test procedures, and pressure ratings for wellheads and wellhead equipment are defined on API Spec 6A: Specification for Wellhead and Christmas Tree Equipment from the American Petroleum Institute (API).
Applications
Wellheads are manufactured by different methods and for different purposes. Factors that affect a wellhead's configuration include pressure, temperature, location, well depth, well size, well purpose, expected well life, well control equipment interface, and drilling method. In terms of applications, wellhead equipment is used for casing suspension and to provide pressure isolation when multiple casings are used. Wellheads also provide a way to attach blow-out preventers (BOPs) during drilling. In addition, wellhead equipment is used to provide a method for attaching a tree for well-control during production, injection, or other operations. Finally, these products are used to provide well access and a means of pump attachment.
Vigor's wellhead Christmas trees are manufactured in strict accordance with API 6A & NACE MR0175 standards, and Vigor's QC team will follow up and record the whole process to ensure that each batch of products can be produced according to the standards and deliver the goods to our customers on time. If you are interested in Vigor's wellhead equipment and downhole drilling and completion equipment, please do not hesitate to get in touch with us, you will get the best quality service.
