Patent EA-005083-B1 (EA)
Title: Well jet device for well testing and developing and the operating method for said well jet device
IPC: F04F5/02
Filed: 2002-05-28
Abstract: 1. The well jet device comprising a packer, a piping string and a jet pump, in the body of which an active nozzle with a mixing chamber are arranged and a stepped through passage is made with a mounting seat between steps for installing a sealing assembly having an axial channel, the said device being provided with a transmitter and a receiver-transducer of physical fields, which is arranged at the jet pump side for entry of the medium pumped out of the well, the jet pump output side is connected to the space around the piping string, the input side of the jet pump passage for supplying the pumped out medium is connected to the inner cavity of the piping string below the sealing assembly, and the input side of the passage for supplying the working medium to the active nozzle is connected to the inner cavity of the piping string above the sealing assembly, and the through passage of the jet pump is made parallel to the axis of the piping string, characterized in that the axis of the active nozzle is parallel to the axis of the through passage and being located from the latter's axis at a distance equal at least 1.1 radii of the bigger step of the through passage, the diameter of the bigger step in the through passage, which is located above the mounting seat, is at least 0.5 mm greater than the diameter of the step in the through passage, which is located below the mounting seat; the sealing assembly is arranged on the well-logging cable or on a wire fed through the axial passage and installed with the possibility of being replaced, e.g., in turns, by the functional inserts, namely, a hydrostatic testing insert, a depression insert, a blocking insert, an insert for recording stratum pressure restoration curves and an insert for hydrodynamic impact on the stratum, the diameter of the axial passage in the sealing assembly is not greater than 0.6 outer diameter of the sealing assembly; the axes of the sealing assembly and the functional inserts are aligned with the axis of the through passage in the jet pump; the functional inserts are made with the possibility of installing on them autonomous well instruments and sampling devices and are made with a tool for delivery and removal of them from the jet pump with the use of cable equipment, the sealing assembly being installed with the possibility of moving it along the well-logging cable or a wire above the cap on which the transmitter and receiver-transducer of physical fields is arranged, the latter being connected to the well-logging cable cap with the possibility of being replaced by other well instruments, e.g., a perforator, an ultrasonic transmitter, a sampling device, a thermometer, a pressure gauge, which all may be connected, either in turns or jointly, to the well-logging cable or a wire. 2. The method of operation of the well jet unit, including installation on the piping string of the packer and the jet pump having the through passage with the mounting seat, lowering of that assembly into the well, release of the packer and arrangement in the well, below the jet pump, of the transmitter and receiver-transducer of physical fields, characterized in that the said transmitter and receiver-transducer of physical fields being lowered together with the sealing assembly arranged on the well-logging cable or a wire above the cap with the transmitter and receiver-transducer connected to the latter, when lowering into the well, the transmitter and receiver-transducer of physical fields is used for background measurements of temperature and other physical fields before the well bottom, the sealing assembly is installed onto the mounting seat in the through passage without impeding the back and forth motion of the well-logging cable or wire, then the transmitter and receiver-transducer of physical fields is arranged in the stratum interval under exploration and, by supplying the working medium to the nozzle of the jet pump, several values of pressure drawdown on the stratum are successively created, and, at each its value, bottom-hole pressures, compositions of the fluid coming from the stratum and the well flow rate are measured, after which the parameters of physical fields are recorded by moving the transmitter and receiver-transducer of physical fields along the well axis in the speed range from 0.1 to 100 meters per minute and at bottom-hole pressures changing stepwise from the stratum pressure to 0.01 stratum pressure, the transmitter and receiver transformer of physical fields being moved along the well axis both when the jet pump is operated and when it is shut down; then the transmitter and receiver-transducer of physical fields is lifted out of the well, and the functional insert for recording stratum pressure restoration is lowered, the said insert being provided with a pressure sensor and a sampling device, installed in the through passage of the jet pump, a required pressure drawdown on the stratum is created with the use of the jet pump, and, after sharp stopping of supplying the liquid working medium to the jet pump, a stratum pressure restoration curve for the well zone under the packer is recorded, said recording of stratum pressure restoration curves may be done repeatedly at different pressure drawdown on the stratum; after that the results are processed, and a decision is taken whether repair works on the well are necessary, such works being conducted with the use of the jet pump and the alternatively applied functional inserts being lowered into the well with the sealing assembly on the well-logging cable or wire and with, e.g., a perforator, an ultrasonic transmitter, a sampling device, a thermometer and a pressure gauge; after completion of the said works the cycle of well exploration is repeated.