COMPLETION METHOD FOR A PRODUCTION WELL THAT HAS OPENED A TRANSITIONAL ZONE OF A GAS DEPOSIT Russian patent published in 2023 - IPC E21B33/14 E21B43/00 

FIELD: gas industry.

SUBSTANCE: invention relates to the gas industry, and in particular to a method for completing a production well that has opened a transitional zone of a gas deposit. The method of completing a production well that has opened a transitional zone of a gas deposit includes drilling a well for a conductor, lowering a casing string; carrying out works on cementing in the outer annulus, followed by waiting for the cement to harden; drilling a well for the production casing with the opening of the productive formation to the full thickness; descent of the production string; cementing and waiting for the cement to harden, flushing the well with a solution of calcium chloride, drilling out the packer, pumping hydrochloric acid into the under-packer space and destroying fusible inserts, developing and bringing to operation. In the proposed method, a well is drilled under a production casing with opening of a productive gas-saturated formation with a transition zone for the entire thickness with drilling fluid, running a production casing equipped with a staged cementing sleeve and an annular collar cementing packer, with overlapping the entire thickness of the productive gas-saturated formation with a transition zone. Annular packer for collar cementing is installed in the interval of the roof of a productive gas-saturated formation with a transition zone. Next, the well is flushed by replacing the drilling fluid in the wellbore with a 3% solution of calcium chloride CaCl₂, cementing the production string through the staged cementing sleeve, when the cement hardens a cutter assembly is used for drilling out the annular collar cementing packer of on a 3% aqueous solution of calcium chloride CaCl₂, flushing the well with a 3% aqueous solution of calcium chloride CaCl₂, pumping 20% hydrochloric acid HCl into the under-packer space with the destruction of fusible inserts, lowering the drill string with a mechanical packer and forcing into the pore structure of the reservoir with a transition zone of the composition based on hydrophobic organosilicon fluids and ethyl esters of orthosilicic acid, resulting in the formation of a water-proof screen in a productive formation with a transition zone, the lower part of which, upon contact with ethyl esters of orthosilicic acid with water, becomes impermeable to water, and the upper part is carried out into the reservoir important during its commissioning, then the downhole equipment is lowered and the formation is developed by the method of reducing the density of the liquid and bringing it to the gas production mode.

EFFECT: development of the effective method for completing a production well that has opened the transition zone of a gas deposit.

1 cl, 7 dwg