To maximize liquids recovery, the gas may need to be at 850 to 1000 psig (60 to 70 barg) when it passes to Hydrocarbon Recovery (this pressure requirement drops to 600 to 650 psig if only propane and heavier components are to be recovered).Īs such, compression once the gas leaves Inlet Receiving is often a necessity. These are typically characterized by a low overall compressor ratio and relatively high throughput. In such cases a "booster compressor" may be installed. In some marginal gas fields, and in many larger gas fields that experience a decline in flowing pressure with time, economics may dictate that the wells flow at surface pressures below that required for gas sales. Gas exiting Hydrocarbon recovery and entering the pipeline, and.Gas coming from stabilizing the liquids in Natural Gas Liquids Processing, and from other vapor recovery facilities that collect low pressure gas.There are a variety of gas processing streams that undergo compression including: Pressure also provides the cooling for gas to low temperatures. Pressure plays a major role in gas processing, as it moves the gas from the field through the gas plant and into the sales gas line. High pressure discharge gas from the compressor may contain some free liquid water and liquid hydrocarbons which need to be removed by installing appropriate filter coalescers or gas scrubbers downstream of the compressor. To protect the compressor from damage during operation, filters or scrubbers that are able to remove very fine particulates (both solid and liquid) from the feed gas are required upstream of the compressor. If the field operation pressure is low, upstream compression may be required to compress this gas to medium to high pressure (200-1000 psig) for the processing to meet required pipeline specifications. Some of the transportation pipelines require higher pressure to keep pipe diameters smaller and to keep gas in the dense phase and thus prevent condensation and two-phase flow within the pipeline. High Pressure operation downstream of the field operation may be critical to drive liquids recovery from hydrocarbon rich gas depending upon the local markets and logistics. Gas gathering and field operations dictate upstream gas compression requirements. In this discussion, I will look at the role that compression plays in gas processing and the various technologies that are available in the industry as well as their applications.
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