Tag Archives for Wellhead Compression

Wellhead Compression – Dual Completions

Attempting to utilize a single compressor to service both the casing and tubing flows on a dual completion well can present some real problems. On one installation, both the casing and tubing were piped into the suction of the reciprocating … Continue reading

14. October 2009 by Jack
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Wellhead Compression – Minimum Suction Pressure

field compressor to trip-off prematurely. In this case, the field operators were reporting that they could not operate a compressor suction below 70 PSIG. Their experience had taught them the following: 1. They would set the compressor to operate in … Continue reading

14. October 2009 by Jack
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Wellhead Compression – Transient Effects

To further complicate the adjustment of a field compressor, one needs to be aware of certain transient effects that the well imposed on the compressor. • Many wells, immediately after unloading liquids exhibit an increase in wellhead pressure sufficient to … Continue reading

14. October 2009 by Jack
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Wellhead Compression – Varying Speed

If a compressor has an excessively high second-stage (crankend) discharge temperature and a low first-stage (head-end) discharge temperature, one should proceed as follows: • Reduce the adjustable clearance on the head-end. • Slow the machine down. • Balance the above … Continue reading

13. October 2009 by Jack
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Wellhead Compression – Rod Loading Limit

As the wellhead pressure falls, the differential pressure that the field compressor must deliver increases. This is because the collection header into which the compressor discharges remains relatively constant. As this differential pressure rises, the compressor may become limited by … Continue reading

13. October 2009 by Jack
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Wellhead Compression – Horse Power Bottlenecks

There are three fundamental limits to which all field compressors are subject: • Compressor rod loading • Speed • Engine horsepower In addition to calculating the actual engine horsepower by the above equation and comparing it to the name plate … Continue reading

13. October 2009 by Jack
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Wellhead Compression – Increasing Wellhead Tubing Velocity

The easiest, but least cost effective method, to operate a field compressor is the crank-end mode. When only the Crank-end (i.e. second stage) is in operation, capacity, compression ratio, as well as engine horsepower load and compressor rod loading are … Continue reading

13. October 2009 by Jack
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Wellhead Compression – Entrainment Velocity

This incident illustrates the importance of adjusting field compressor operation to maintain a minimum velocity in the production tubing. The velocity must be sufficient to entrain water, which migrates into the well, up into the high pressure separator. Based on … Continue reading

13. October 2009 by Jack
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Wellhead Compression – Compressor Configuration

Figure 4-1 illustrates a typical two-stage compressor. Machines of this type range from 30 to 300 horsepower. They are driven by a gas engine; fueled by natural gas. Engine speed is 250 to 450 rpm, with the compressor inter-cooler and … Continue reading

13. October 2009 by Jack
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