METHOD OF PREPARING ACID GAS FOR PUMPING INTO RESERVOIR THROUGH PRESSURE WELL Russian patent published in 2008 - IPC E21B43/40 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry, particularly to methods of preparing acid gases to pumping into reservoir through pressure well for utilisation of these gases. According to the invention acid gas is successively supplied into the first, second and the third blocks of compressing-cooling, consisting of a compressor, refrigerator and separator arranged successively; acid gas is compressed to 2.5-5.0 MPa pressure in the compressor of the third block of compressing-cooling, then gas is cooled to the temperature of 40÷60°C. Acid gas is supplied from the upper part of the separator of the third block of compressing-cooling to an absorber of a drying block; dried acid gas of 45÷65°C temperature is withdrawn from the upper part of the absorber and is transferred into a liquid one phase state by means of supplying to compressing up to 5.5-10.0 MPa pressure and cooling to the temperature of 40÷60°C. Further liquid acid gas is pumped through a pressure well into a reservoir. Acid components absorbed by an absorber-expander are extracted and supplied for mixing them with a flow of acid gas after the first step of compressing. Absorbent is regenerated in a regenerator. Water vapour extracted in the regenerator is cooled and supplied to mixing with water extracted in the separators of the first, second and third blocks of compressing-cooling, after that water is withdrawn for household use or for pumping into the reservoir.

EFFECT: facilitating exclusion of water usage at pumping acid gases into a reservoir; reduction of hazard of corrosion destruction of equipment and pipelines and preventing formation of hydrates.

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