Traditionally, in the Oil & Gas industry, waste and surplus gas has been disposed of by flaring to atmosphere. Today this process is becoming increasingly unacceptable as the industry progresses towards eliminating the emission of greenhouse gases into the atmosphere, whilst simultaneously conserving energy. Therefore, the demand for equipment that can safely and economically compress waste and surplus gas back into the production process is rapidly increasing. Ejectors are ideally suited to this application because they employ either the available high-pressure gas or liquid energy to entrain and compress waste and surplus gas to a pressure where the gas can be recovered into production or used as fuel gas. With no moving parts and requiring no maintenance, Ejectors are the only sensible choice.
Driving your Ejectors
Ejectors operate with either a gas or a liquid as the high pressure motive fluid. In many cases, only a small compression is required to facilitate waste gas re-entry into the production process. Most commonly, this is re-enters the process as fuel gas, is sent to export, or is used as injection/lift gas. Gas motivated Ejectors offer a compression of 7:1 in a single stage. This can be further boosted with the use of a secondary Ejector shown on the next page. Liquid driven Ejectors offer compressions of up to 90:1. Where water is used to drive an Ejector, facilities can often provide available separator capacity to handle the discharge water.
In many cases, the recovery of gas from a separator results in a boost in production from the upstream manifold as the reduction in backpressure from the separator allows wells to flow more easily.