METHOD OF OPERATION OF THE INJECTION WELL WITH SIMULTANEOUS-SEPARATE INJECTION OF FLUID Russian patent published in 2019 - IPC E21B43/14 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used for operation of injection well at simultaneous separate injection of working agent. Method includes assembling at wellhead and lowering into well of long string with packer and short string, non-suitable investigation of tightness of production string and reservoir capacity during well operation after introduction of downhole pumping equipment. Preliminary production string is templateed with length not less than packer length, defining jumper interval for packer with length of not less than 3.5 m with cement in annular space, packer is lowered on the tubing string, investigations are carried out with determination of the injectivity of disintegrated formations, and the packer is lifted. When installing a long string prior to erection of the packer, a pipe with a retaining ring and high-tight couplings or couplings with a sealant on the thread, having reduced by 2 mm, compared to the standard one, outer diameter, above the packer there is installed a branch pipe with couplings, one pipe of the tubing string with a reference pipe, then assembled on high-tight couplings or couplings with sealant on the thread of the tubing string, installing packer, long string is stretched by 2–3 t load higher than own weight of string, and long string is fixed at wellhead in wellhead equipment. During installation of short string tubing is collected on couplings with sealant on thread, bottom of string is equipped with coupling, short pipe includes additional branch pipes by means of which clutches of one string are arranged between clutches of the other string, after lowering every 4–6 pipes, short string is lifted and lowered by pipe length at least 2 times, shoe of short string is arranged above roof of upper formation by 20–30 m. Well is filled with anti-corrosion fluid above the level of short string bottom. For string installation there used are the tubes with internal anti-corrosion and antifouling smooth coating. There performed is the string gauging by gauge with polyamide coating. After certain time of well operation under pumping, control measurement of thermometry is made along the shaft at downhole of geophysical instrument in long tubing string from wellhead to bottomhole, bottomhole digging, opening of fluid pumping in short string of tubing string for at least 30 minutes depending on injectivity of wells for filling and recovery of injection pressure, pumping fluid into well, thermometry is recorded along the shaft at the downhole of the geophysical instrument in the long tubing string from the wellhead to the well bottom to determine the tightness of the production string, the short tubing string and the packer. Liquid pumping is opened through a short tubing string, thermometry is recorded 100 m, starting higher by 30 m of upper perforation intervals to stop the device, 1 pumping metering and 3 records after pumping stop on short tubing string to determine tightness of packer, profile of fluid movement into formations. Injection is pumped into a short string of tubing string, pressure pickup profile is measured through a long tubing string in the interval from formations to shoe tubes. Thermometry is recorded along the shaft at the descent, in the long tubing string from the wellhead to the bottomhole. Pumping is initiated through a long tubing string for not less than 30 minutes depending on injectivity of wells for filling and recovery P of pumping, thermometry is recorded at 100 m, in lower intervals of perforation from packer to bottomhole, 1 pumping metering and 3 records after pumping stop at long string of tubing string. Then geophysical instrument is measured at the long string of tubing string from the bottomhole to the wellhead after additional fluid injection.

EFFECT: technical result is higher efficiency of injection well operation.

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