Category Archives for Wellhead Control Systems

Wellhead Control Systems – Tagging and Nameplates

Nameplates and tagging are very important for the factory checkout of the panel, the installation of the panel, safe operation of the controls, and maintenance troubleshooting of the wellhead control system. These are some important considerations: • All internal components … Continue reading

20. April 2018 by Juan
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Enclosures for Wellhead Control Systems

Enclosures are usually made of 316 stainless steel to withstand the corrosive environment of offshore platforms or the workover conditions around the wellheads. As a minimum, all the hardware must be made of 316 stainless steel. This includes hinges, latches, … Continue reading

20. April 2018 by Juan
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Panels for Wellhead Controls

Several vendors specialize in building wellhead control panels. In order to be competitive, they will offer to supply the minimum number and lowest quality of logic and panel components. To get a panel that is reliable and maintainable, a drawing … Continue reading

20. April 2018 by Juan
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Testability and Maintenance During Operation

A three-way valve on the panel can be installed to bypass the high- and low-pressure pilots and the sand probes while sensors are being tested, calibrated, or replaced. For safety reasons, it should be very evident from a distance that … Continue reading

20. April 2018 by Juan
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Wellhead Control Panel – First Out Indication

If three sensors are used to shut down the surface safety valve (e.g., high-pressure, low-pressure, and sand probe), then first out indication may be desirable. Most wellhead control panels in the Company have not required this feature in the past, … Continue reading

20. April 2018 by Juan
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Flowline Pressure Rating, Ten Foot Rule

Flowlines transport hydrocarbons from the wellhead to the first downstream process equipment or vessel. Flowlines are divided into flowline segments. A flow-line segment is a portion of the flowline that has an assigned operating pressure from the other portions of … Continue reading

20. April 2018 by Juan
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Other Safety Interlocks and Features

Low- and high-level alarms on the main hydraulic reservoir tank are normally included to alert the operator that a hydraulic leak or backflow of process fluids from the well through the control tubing has occurred. The hydraulic fluid reservoir must … Continue reading

20. April 2018 by Juan
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Safety Interlock to Open SCSSV First

The SCSSV must have a safety interlock to make sure that this valve is opened before the SSV. The SCSSV is extremely difficult to open when there is a maximum differential pressure across the valve, which would be true if … Continue reading

20. April 2018 by Juan
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Time Delays to Close SCSSV

A remote emergency shutdown from the platform ESD system must shut down the SCSSV, but only after a nominal 2-minute time delay. This delay will ensure that the SSV at the wellhead is closed first to allow it to absorb … Continue reading

20. April 2018 by Juan
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Wellhead Control Systems – Hydraulic Pumps

Most hydraulic pumps are air or natural gas driven reciprocating pumps. Electrically driven pumps are occasionally used. As shown in Figure 1700-12, the gas power end has a larger area than the liquid end. The pump reciprocates due to the … Continue reading

20. April 2018 by Juan
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