PROCEDURE FOR PUMPING GASSY FLUID INTO FORMATION Russian patent published in 2010 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry, particularly to procedures of pumping gassy fluid into formation. The procedure consists in lowering concentric arranged internal and external strings into well, in simultaneous-separate pumping fluid and gassy phases into well via strings, in mixing phases with an ejector directly near the formation and in pumping this gassy fluid into formation. From above the internal pipe string is equipped with a nipple, while the ejector is equipped before installation with a low pressure chamber with the following channels: upper inlet, central for the nipple and side ones; further they are lowered into the well at the end of the external pipe equipped with an external packer. Upon this the packer is arranged above the formation and the internal pipe column is lowered along the external pipe column to pressure tight interaction of the nipple with the central channel of the low-pressure chamber. Fluid and gassy phases are mixed in the low pressure chamber of the ejector supplying fluid under pressure through the internal pipe via the nipple, while supplying gas through the external pipe via the side channels. Also gassy fluid is pumped into the formation by means of pressure of pumped gassy fluid. Required value of saturation is facilitated by changing volume of the low pressure chamber inserting and withdrawing nipple into it at length of the nipple without removing from the central channel.

EFFECT: raised efficiency of pumping due to control over mixing fluid and gas, to reduced losses at pumping gassy fluid into formation, also due to regulation of fluid saturation value.

1 dwg