METHOD AND EQUIPMENT FOR INTERVAL RESEARCH OF FORMATION PARAMETERS AT TUBES Russian patent published in 2017 - IPC E21B43/14 E21B49/08 

FIELD: mining.

SUBSTANCE: method includes the downhole equipment lowering into the well to the specified depth, consisting of an oilwell tubing column (OWT), upper and lower inflatable packers with the radial holes in the inflation chambers, the outer and inner flexible sleeves with disposed between them the metal plate frame, switching of the upper and lower inflatable packers from transport to working position. The assembly and lowering of the downhole equipment is carried out in the following sequence: the plug, the circulation full bore tube valve with the shear pins, the lower centralizer, inflate and bypass valve of the inflatable packers layout (IBVIPL) underpackers, the lower inflatable packer and inflate valve, interpacker disconnect switch, interpacker IBVIPL, upper inflatable packer and inflate valve, the upper centralizer, overpacker disconnect switch, circulation valve. At the beginning of the downhole equipment lowering, the inflate valves of the inflatable packers, underpacker IBVIPL and interpacker IBVIPL are in the closed position. When the casing pressure is exceeded over the OWT column pressure, the opening of the bypass holes of underpacker and interpacker IBVIPL and filling of OWT column with borehole fluid is carried out. The bypass holes of underpacker and interpacker IBVIPL are closed automatically, then provide the first fluid supply. At that the inflate and bypass holes of underpacker and interpacker IBVIPL are closed and build the pressure, at which the upper and lower inflate valves of the upper and lower inflatable packers are opened respectively, bringing the inflatable chambers into the working position. The downhole equipment is stand under the pressure, then slowly carry out the first pressure releasing: if it reaches the value, the inflate valves are closed completely. The inflatable packers are moved to the working position and intervally overlap the wellbore. At the first pressure release in the underpacker IBVIPL there is the opportunity to open the bypass holes, then the fluid selection is carried out from the underpacker area. The inflate and bypass holes of interpacker IBVIPL are closed. The second fluid supply is performed and the constant pressure is built, at which the inflate holes are opened in underpacker IBVIPL . If necessary, the process fluid inflate to the underpacker area is carried out, during which the inflate and bypass holes of interpacker IBVIPL are closed. Produce the second pressure release, at which there is the opportunity to open the bypass hole in the interpacker IBVIPL. The fluid selection from interparcker area is performed during which the inflate and bypass holes of underpacker IBVIPL are closed. The third fluid supply is performed and the pressure is built, at which the inflate holes of interpacker IBVIPL are opened, and the inflate and bypass holes in underpacker IBVIPL are closed. Produce the third pressure release, at which the inflate and bypass holes of both IBVIPL come to the starting position.

EFFECT: acceleration of works on the sample fluid selection or process fluid inflate into the underpacker and interpacker well areas at one tripping process.

2 cl, 6 dwg