CROSSOVER VALVE SYSTEM AND METHOD FOR GAS PRODUCTION Russian patent published in 2018 - IPC E21B34/10 E21B43/12 F16K31/42 

FIELD: soil or rock drilling; mining.

SUBSTANCE: crossover valve assembly for insertion into production tubing, or integral with production tubing, includes an outer housing, an inner production tube, a pilot section responsive to external pressure to open an activation passage above a pre-determined pressure, a power section responsive to pressure in the activation passage to open an injection opening; and a crossover valve responsive to pressure in the injection opening to open a crossover port, allowing fluid communication from outside the outer housing to within the inner production tube. Crossover valve assembly may be used in a method of producing a vertical, deviated or horizontal gas well having an annular space defined by a well casing and a concentrically disposed production tubing; an annulus exists above a packer isolating the annulus, wherein the method comprises the following steps: (a) opening a communication path through the tubing into the annulus, and if necessary, removing any fluid in the annulus; (b) landing a crossover valve assembly within the production tubing above the packer and such that it is exposed to conditions existing in the annulus; and (c) injecting gas into the annulus to open the crossover valve and enter the production tubing, wherein the injected gas lifts liquids in the production tubing to the surface.

EFFECT: technical result is higher efficiency of producing well stocks.

17 cl, 10 dwg