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 a well, in simultaneous-separate pumping fluid and gassy phases into the well via the strings, in mixing them with an ejector directly near the formation and in pumping this gassy fluid into the formation. From below the internal string is equipped with a nipple with a valve above it, while the ejector is made in form of a block of several jet pumps with low-pressure chambers communicated with upper inlet, central for the nipple and side channels. Also the ejector is 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 chambers of the jet pumps of the ejector supplying fluid under pressure through the external pipe via the side channels, while supplying gas through the internal pipe via the nipple. Also gassy fluid is pumped into the formation under pressure of pressurised gassy fluid, while level of saturation is controlled with changing volume of the low pressure chambers of the jet pumps by introduction into the central channel and withdrawal out of it without taking off the nipple.

EFFECT: increased efficiency of pumping due to facilitation of control of fluid and gas mixing and regulation of fluid saturation value.

1 dwg