RU2107842C1 - Method of operation of well pump-ejector impulse unit and design of unit - Google Patents

Abstract

FIELD: oil producing industry; recovery of liquids from wells. SUBSTANCE: proposed unit is designed for bottom hole treatment. Method can be used for recovery of liquid media. Active medium is delivered into hydraulic pulse device, and well underpacker zone is subjected to treatment at hydraulic pulse cavitation duty. Treatment carried out, packer is installed in well, and depression insert is installed after which liquid medium with particles pumped out of underpacker zone by jet device. Pump - ejector unit is furnished additionally with packer, central check valve, hydraulic pulse device installed lower than packer, system of check valves and locking insert. Check valve is installed in locking insert, and locking insert is installed for replacement by depression insert. EFFECT: facilitated recovery of liquids. 2 cl, 2 dwg

Description

 The invention relates to inkjet technology, mainly to downhole jet installations for treating the bottom-hole zone of a well formation with hydraulic pulses of a working medium.

 A known method of operating a downhole jet installation, comprising supplying an active liquid medium to a nozzle of a jet apparatus through a tubing string, entraining a passive medium with it and mixing with it and supplying a mixture of media from the well to the surface [1].

 Also known is a downhole jet installation comprising an ink jet apparatus mounted on a tubing string with an active nozzle, a mixing chamber, and a diffuser [1].

 However, in this method of operation, the aforementioned downhole jet installation does not have the ability to exert any effect on the borehole zone, which drastically reduces the possibility of using this downhole jet installation.

 Closest to the described is the method of operation of a pumping-ejector well installation, which includes supplying an active liquid medium through a tubing string, pumping out a passive medium from a formation zone, flushing a mixture of wellbore zone media, and supplying a mixture of mediums from the well to the surface [2].

 Also known is a pump-ejector well installation, which is closest to the described one and contains a jet apparatus installed on a column of tubing with an active nozzle, a mixing chamber, a diffuser, a channel for supplying an active liquid medium and a channel for supplying a passive (pumped out) medium [2] .

 In this installation, in the method of its operation, it was possible to combine two functions - flushing the well and pumping out the medium from the well.

 However, in the known installation, operating according to the known method, the energy of the liquid active medium is not used effectively to affect the reservoir in the near-wellbore zone, which reduces the efficiency of the installation.

 The objective of the invention is to increase the productivity of oil and gas wells put into operation, increase the injectivity of injection wells introduced after drilling and overhaul, restore and increase the coefficient of productivity and initial permeability of oil and gas wells after their repair.

 This problem is achieved in that in terms of the method of operation of the pump-ejector pulse installation, which includes supplying active liquid medium through the tubing string to the nozzle of the jet apparatus, pumping out the passive medium by the jet apparatus from the reservoir zone and first supplying the mixture of media from the well to the surface, first the active medium is fed into the hydro-pulse device and the active medium is processed in the hydro-pulse cavitation mode of the borehole sub-packer zone with the removal of part of the medium from the well to the surface, and after processing the borehole zone, the packer is installed in the well and then a depression insert is installed in the tubing string, after which the active medium is supplied to the active nozzle of the jet apparatus and due to this, the liquid medium is pumped out from the sub-packer zone along with the hydro-pulse treatment clogging particles.

 In the part of the device, the above technical problem is solved due to the fact that the pump-ejector installation for implementing the method of its operation, comprising a column of tubing and a jet apparatus installed on a column of tubing with an active nozzle, a mixing chamber, a diffuser and channels the supply of active liquid and passive environments, is additionally equipped with a packer, a central check valve, a water-pulse device mounted on a pipe string below the packer, a system of check peripheral valves, located on the pipe string between the water-pulse device and the packer and the blocking insert, the central check valve being placed in the latter, and the blocking insert installed with the possibility of replacement with a depression insert, and the active nozzle from the inlet side is blocked by a blocking insert and open for supplying an active medium when installing a depression insert, the latter, when installing it, the cross section of the pipe string is blocked.

 Implementation of the proposed method of operation of a pump-ejector well pulse installation in the pump-ejector installation described above can achieve a sharp increase in the flow rate of the active medium in the horizontal plane in the installation zone of the hydro-pulse device by radially supplying the active medium with the formation of cavitation cavities in the latter. The rupture of cavitation cavities is avalanche-like, acquires an oscillatory character with resonance phenomena. At the same time, caverns are removed with the flow of the active medium into the channels, pores, and fractures of the reservoir. The collapse of the caverns in the formation zone is accompanied by sound waves and strong hydraulic shocks, which creates a high destructive force in the formation. Subsequent treatment of the near-wellbore zone by pumping the borehole medium from the treatment zone allows intensively pumping out the medium from the formation treatment zone, which makes it possible to intensify the process of preparing the well and restoring the productive operation of the well, while the phase permeability for oil is increased and it is possible to remove water and hydrated layers from the surface of the bottomhole formation zones.

 In FIG. 1 shows a pump-ejector borehole pulse installation during a hydro-pulse treatment of a well; in FIG. 2 - pump-ejector borehole pulse installation during the pumping of the medium from the well.

 The pump-ejector borehole pulse installation, which implements the described method of operation, comprises a tubing string 1 and a jet apparatus installed on a tubing string 1 with an active nozzle 2, a mixing chamber 3, a diffuser 4 and channels 5 and 6 for supplying an active liquids and passive environments. The installation is additionally equipped with a packer 7, a central check valve 8, a water pulse device 9 installed on the pipe string 1 below the packer 7, a peripheral check valve system 10 located on the pipe string 1 between the water pulse device 9 and the packer 7, and a blocking insert 11, while the central check valve 8 is located in the latter, and the blocking insert 11 is replaceable with a depressive insert 12, and the active nozzle 2 from the inlet side is blocked by the blocking insert 11 and is open for supply active medium when installing the depressive insert 12, the latter, when installing it, is blocked by the cross section of the pipe string 1.

 The described method of operation of the pump-ejector borehole pulse installation is implemented as follows.

 An active liquid medium (water, saline solution, etc.) is supplied through a column 1 of tubing pipes under pressure to a pumping ejector unit. Under operating pressure, the active medium flows through the pipe string 1, overcoming the central check valve 8, into the hydraulic pulse device 9. At this stage of the installation operation, the blocking insert 11, previously installed in the pipe string 1, prevents the active medium from entering the active medium supply channel 5 and the channel 6 supply passive environment. At the same time, under the influence of the pressure of the active medium, the passage of the active medium through the system of peripheral check valves 10 is closed. The packer 7 is not unpacked, that is, it is in a transport state and does not interfere with the flow between the sub-packer and over-packer zones. In the hydro-pulse device 9, the flow of the active medium is converted into a horizontal high-speed flow with cavities and cavitation cavities acting on the formation. The collapse of cavities and caverns in the formation zone is accompanied by sound waves and strong hydraulic shocks with the occurrence of vibration, which creates a high destructive force in the formation and promotes the separation of clogging particles.

 At the end of the formation treatment, injection of pipes of active liquid medium into the annular space of the column 1 is carried out, as a result of which the system of checkback peripheral valves 10 is opened, and the blocking insert 11 together with the central check valve 8 is removed from the pipe string 1 with the check valve 8, while the check valve 8 is in the closed position. Instead, they run down the pipe string 1 and install a depressant insert 12 in the pump-ejector installation, which overlaps the transverse space of the pipe string 1 in the zone between the channels 5 and 6 for supplying active and passive media. Thus, the installation is transferred to the state shown in figure 2. Then the active liquid medium through the pipe string 1 and then through the channel 5 for supplying the active medium is fed into the active nozzle 2 of the jet apparatus. The active medium, flowing out of the nozzle 2, entrains a passive medium (a mixture of the formation fluid and the clogging particles) into the mixing chamber 3 from the sub-packer zone. Previously, before the active medium is fed into the nozzle 2, a packer is installed, that is, the space is separated from the outside of the pipe string 1 into the sub-packer and packer zones. From the mixing chamber 3, the mixture of active and passive media enters the diffuser 4 and then, flowing into the annulus into the overpacker zone, the mixture of media is carried to the surface.

 If necessary, the well treatment cycle can be repeated.

Claims (2)

 1. The method of operation of a pump-ejector well borehole pulse installation, comprising supplying an active liquid medium to a nozzle of a jet apparatus through a tubing string, pumping a passive medium from a formation zone by a jet apparatus and supplying a mixture of media from the well to a surface, characterized in that at the beginning the active medium is fed into the hydraulic pulse device and the active medium is processed in the hydraulic pulse cavitation mode of the borehole sub-packer zone with the removal of part of the medium from the well to the surface, and after In order to process the near-wellbore zone, the packer is installed in the well and then a depressant insert is installed in the tubing string, after which the active medium is supplied to the active nozzle of the jet apparatus and, as a result, the liquid medium is pumped from the sub-packer zone to the surface with colmatating particles.  2. Pump-ejector borehole pulse installation for implementing the method of its operation, comprising a column of alluvial pipes and a jet apparatus installed on a column of tubing with an active nozzle, a mixing chamber, a diffuser and channels for supplying active liquid and passive media, characterized in that the installation is additionally equipped with a packer, a central check valve, a water-pulse device mounted on a pipe string below the packer, a system of peripheral check valves located on the not pipes between the water-pulse device and the packer, and the blocking insert, while the central check valve is located in the latter, and the blocking insert is installed with the possibility of replacing it with a depressive insert, and the active nozzle from the inlet side is blocked by the blocking insert and is open for supplying the active medium when the installation of the depressive insert, the latter, when it is installed, the cross section of the pipe string is blocked.

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