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Home > Technical Information > DGWS > Wellhead Configuration Language Setting:

Overview

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Well Selection Criteria

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Wellhead Configuration

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Typical DGWS Wellhead Configuration

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This is a typical DGWS wellhead configuration. This configuration prevents excessive tubing pressure

build-up if a failure downhole occurs. Failures that could occur is hole(s) develops in the tubing, the

downhole stuffing box (DSB) leaks, the insert pump becomes unseated and or etc. However, if the DSB

tool leaks it could leak either way, up or down. If the DSB does develop a leak, it is a very small (drip)

leak. See DHI's Manual of Practice (MOP) for more information.

The surface backpressure valve (12) must be set so that the maximum pressure in the tubing at the

surface cannot exceed 50psig. In addition, all of the valves except for the 2" and 1" valves that have the

bull plugs screwed in must be fully open during operation. The bull plugs are present to prevent a spill if

the valves develop a leak. Therefore, the bull plugs must always be securely tighten into the valveswhen personnel is not present at the wellsite.

The inhibited/lubricated fluid in the tubing will evaporate if the tubing is vented at the surface. In addition,

this fluid can expand after initial start up, resulting in increased pressure at the surface. After initial start

up gas and or air that is entrained or dissolved in the inhibited/lubricated f luid will build up at the surface

and this gas must be vented off and that volume replace with inhibited/lubricated fluid. See DHI's

installation procedure for more information.

The surface tubing pressure and fluid level in the tubing must be monitored to insure proper DGWS

operation. For more information about DGWS monitoring and control see DHI's Manual of Practice.

All valves, nipples, tees, elbows, plugs, connectors, plumbing and pipes must be sized and the

appropriate grade/rating to withstand the operational pressures and flows. Insure that all surface

connections are properly lubricated, sealed and fastened before operation.

Well Head

When selecting a well head the casing size, weight and thread must be known. The inner string is tubing

and most of the time will be 2 3/8". The tubing string must be suspended by slips or hangers. The tubing

is set in tension at the surface on all standard RFI systems. See DHI's installation procedure for more

information. The casing head pressure rating (2000 to 3000psig) must be properly selected and the side

outlets are most often 2" LP size. The packing material either nitrile or other seal/o-ring materials must

be properly selected.

For more information about wellheads see: http://www.rmenergy.com/pdf/hercwellhead.pdf

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