RU2431738C1 - Procedure for hydro-dynamic influence on reservoir and device for its implementation - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: jet pump, packer and generator of pulse current arranged on production string are lowered into well. The pump is equipped with channels for supply of working fluid and for withdrawal of reservoir fluid from well. The jet pump, packer and generator of pulse current are positioned above level of perforation of a casing in a zone of the reservoir. Further, the well is processed and cleaned from mud. Working fluid is supplied into the reservoir through production string, channels of the jet pump, the packer and generator of pulse current. Viscous-elastic mixtures are pumped via the production string, channels of the jet pump, the packer and generator of pulse current. Successively, influx from the well is excited and activated by means of un-packing. Working fluid for influx activation is supplied through annular space and the jet pump into the production string. The device consists of the production string, of an upper cylinder case, of the packer with the central channel disconnecting annular space with an under-the packer zone, of the jet pump with its nozzle upwards and of the pulse current generator, all hydraulically connected with the central channel of the packer. An inlet of the jet pump for working fluid in it is connected with annular space via back valves, while an outlet of the jet pump is connected with the production string. Also, the jet pump is equipped with vibrations cut-off device in form of labyrinths, while the generator is positioned below the packer. A coupling with hydraulic channels is installed between the packer and vibrations generator in the device for hydraulic influence on the reservoir. Hydraulic channels of the coupling equipped with back valves communicate the central channel of the packer with annular space.

EFFECT: raised efficiency of reservoir bottomhole zone cleaning due to raised efficiency of implemented device.

3 cl, 1 dwg

Description

The invention relates to the field of pumping technology, mainly to downhole pumping units, and can be used in oilfield equipment for the development and productivity of oil and gas reservoirs.

A known method of operating a well jet device with hydrodynamic effects on the borehole zone of a formation (see RF patent 2222716 C1, F04F 5/02, January 27, 2004), which comprises placing a packer and a jet pump placed on a tubing string into a well with channels for supplying the working agent and the formation fluid pumped out of the well, a jet pump and a packer are installed above the roof of the producing formation and the latter is unpacked, after which the working agent periodically feeds the working agent into the jet nozzle about the pump - water or oil, and the supply of the working agent is carried out in the following mode: sharply feed the working agent into the nozzle of the jet pump at a given pressure of the pump unit and create a depression on the reservoir in 5-10 seconds, maintain the effect of this depression on the reservoir for 2 -20 min by continuously supplying the working agent to the nozzle of the jet pump at a given pressure of the pumping unit, then in 2-5 s stepwise repression is created on the reservoir in the form of water hammer by applying pressure to the reservoir of another agent from the pipe string due to a sharp switch of its supply from the pipe string through the channel for supplying fluid pumped from the well into the under-packer space, then the supply of the entire working agent to the jet pump nozzle is sharply switched and the above-described cycle of acting on the borehole zone of the reservoir with depression and repression , the number of cycles of depression + repression is determined by the degree of restoration of permeability of the near-wellbore zone of the reservoir through periodic monitoring well measurements of the flow rate of the well.

This method of hydrodynamic effects on the formation allows the processing of the formation in the well below the installation level of the packer. However, this method of operation has the following disadvantages:

- firstly, the control of the channel switch, for example with a wireline cable, worsens the operational properties, since after installing the installation in the well, lower the wireline cable and connect it to the valve at a depth of, for example, 1000-2500 m;

- secondly, the dynamic impact on the formation by switching channels to create a water hammer is one-time in nature, for efficient operation it is necessary to switch many times, which reduces the intensity of the dynamic impact and increases the time of well treatment.

The closest to the invention in technical essence and the achieved result is a method and device for hydrodynamic effects on the reservoir and a device for its implementation (see RF patent No. 2360103, ЕВВ 43/18, 12/11/2007), which consists in lowering the placed a pulsating flow generator, a packer and a jet pump equipped with channels for supplying a working fluid and a formation fluid pumped out of the well on a column of tubing, a generator, a jet pump and a packer are installed above the casing perforation level pipe in the zone of the reservoir, unpack the latter, then create a depression on the reservoir by pulsating the working fluid through the generator into the nozzle of the jet pump at a given pressure, then create repression on the reservoir by pulsating the pressure of the working fluid into the under-packer space, at the same time, the pressure of the working fluid on the reservoir is set higher than the value of the reservoir pressure and the above-described cycle of impact on the well is repeated nnuyu zone of the productive formation depression and repression, the impact on the reservoir is stopped when the production rate becomes constant, and the working fluid for creating repression supplied through the annulus, the output of the jet pump and the pumped-out channel formation fluid.

A device for hydrodynamic action on a formation containing a tubing string, a pulsating flow generator, an upper cylindrical body forming an annular space with a casing pipe, a packer with a central channel separating the annular space with a sub-packer zone, a jet pump located in a cylindrical housing, the suction chamber of which communicated with the sub-packer zone, and the output is communicated with the annulus, also contains flow dividers with radial and longitudinal with analogs and check valves that hydraulically connect the corresponding cavity of the tubing string, jet pump, packer, generators and annulus.

The supply of working fluid when creating depression through the pulsating flow generator to the jet pump allows hydrodynamic effects on the formation, however, when the generator is located above the jet pump, most of the kinetic energy goes up in the form of a wave, reflected from the jet pump to the generator, which reduces the generator’s efficiency, how the liquid enters the generator in the form of small tangential holes.

The hydrodynamic effect on the formation leads to disruption of the particles of colmatant located in the first channels of the productive formation in the near-wellbore zone and to the formation of hydraulic fractures, which reduces the flow rate of the well and reduces its durability.

A large number of flow separators and check valves located in the channels through which the supply of working fluid into the reservoir reduces the reliability.

The reliability of the jet pump decreases with clogged generator openings.

The objective of the invention is to increase the efficiency of cleaning and processing the bottom-hole zone of the formation by increasing the efficiency of the generator when supplying the working fluid and pumping the water treatment plants by means of oscillation cut-offs and increasing the power of the jet pump and increasing reliability when calling the inflow by using the coupling, due to additional openings for collecting the mastered fluid .

The specified technical result is achieved by the fact that in the method of hydrodynamic effects on the formation, which consists in the fact that a jet pump located on the string of tubing is equipped with channels for supplying the working fluid and the formation fluid pumped out of the well, a packer and a pulsating flow generator, establish a jet pump, a packer and a pulsating flow generator above the level of perforation of the casing in the zone of the reservoir, then the well is treated and cleaned of kamal tantha, after which the inflow from the well is excited and called, when processing and cleaning the well from the camalt, the working fluid is fed into the formation through the tubing string, the jet pump channels, the packer and the pulsating flow generator, then the viscoelastic mixtures are pumped through the tubing string -compressor pipes, channels of the jet pump, a packer and a pulse flow generator, after which they are unpacked and the working fluid is supplied through the annulus and the jet pump to the column to cause inflow tubing.

The specified technical result is achieved in the device of hydrodynamic effects on the reservoir, containing a tubing string, an upper cylindrical body, a packer with a central channel, disconnecting the annulus with a sub-packer zone, a jet pump and a pulsating flow generator, hydraulically connected to the central channel of the packer, in it the jet pump is located with the nozzle up, the inlet of the jet pump for the working fluid is connected to the annulus through check valves, and the outlet of the jet pump ca - with tubing, and the jet pump contains a cut-off oscillation in the form of labyrinths, and the generator is located below the packer.

In this case, it is possible to install a coupling with hydraulic channels between the packer and the oscillation generator, communicating the central channel of the packer with the annulus in which the check valves are installed.

Since the claimed method is carried out during operation of the proposed device, a description of the method is given in the description of the operation of the device.

The invention is illustrated in the drawing.

The device for hydrodynamic effects on the reservoir (see drawing) contains a tubing string 1, an upper casing 2, forming an annulus 4 with a casing 3, a packer 5 with a central channel 6, uncoupling the annular space 4 with a sub-packer zone 7. In the upper casing 2, a jet pump is installed, comprising a nozzle 8, a mixer 9 and a stream splitter 10. In the stream splitter, longitudinal holes 11 and radial holes are made in which check valves 12 are installed. A channel 13 is made in the mixer 9 of the jet pump The jet pump contains a cut-off oscillation 14 in the form of labyrinths. The device also includes a pulsating flow generator 15 with tangential openings 16. Between the packer 5 and the pulsating flow generator 15, a clutch 17 with radial inlet channels in which check valves 18 are installed is installed.

The device operates as follows.

Lower the device on the tubing string. Then the well is treated and cleaned, for which working fluid is supplied through the tubing string through the channel 13 of the mixer 9, the longitudinal holes 11 of the flow distributor 10, through the central hole of the packer 5, through the central hole of the coupling 16 to the pulsating flow generator 15. The effect of the fluid the reservoir is produced in the mode of pressure fluctuations, which leads to the disruption of the particles of colmatant located in the pore channels of the reservoir, as well as to the formation of the reservoir in the borehole zone microcracks.

Then, viscoelastic mixtures are pumped through the tubing string through the holes 9 and 10 of the mixer, the longitudinal holes of the flow separator 10, through the central hole 6 of the packer 5, through the central hole of the coupling 16 to the pulsating flow generator 15. The method of penetration of viscoelastic mixtures into the reservoir in the mode of pressure fluctuations using pressure shutoff cutters in the form of jet pump labyrinths allows to increase the volume of injections, which makes it possible to increase the product stability in the formation with excessive depression created by production pumps.

The pressure fluctuations increased during power during Vusa injection allow increasing the injection efficiency and using these systems for a longer time (water isolation of formations).

Then, the packer 5 is unpacked and the working fluid is supplied through the annulus 4, the check valves 12, through the flow separator 10 into the entire 8 of the jet pump, and the formation fluid is pumped out through the tangential openings of the generator, coupling and packer channels, longitudinal openings of the flow distributor. Also, the formation fluid enters through the check valves 18 of the coupling 17, and thus, the formation fluid is pumped out even if the tangential openings 16 of the pulsating flow generator 15 are clogged, and also increases the power of the jet pump due to an additional opening for collecting the mastered fluid.

After completion of the treatment of the bottom-hole formation zone, the equipment is removed from the well.

The technical result obtained by the implementation of the claimed invention is expressed in a significant increase in the efficiency of cleaning and treating the bottom-hole formation zone by increasing the generator efficiency when supplying the working fluid and injecting viscoelastic mixtures due to pressure fluctuation cutoffs, increasing the capacity of the jet pump and increasing the reliability when inflow is caused by using couplings due to additional openings for the intake of absorbable fluid.

Claims (3)

1. The method of hydrodynamic effects on the reservoir, which consists in lowering a jet pump located on a tubing string provided with channels for supplying working fluid and pumping formation fluid from the well, a packer and a flow pulsation generator, and installing a jet pump, a packer and a flow pulsation generator above the level of perforation of the casing in the zone of the reservoir, then the well is treated and cleaned from the mud, after which the inflow from the well is produced wells, characterized in that when processing and cleaning the well from the mud, the working fluid is fed into the formation through the tubing string, jet pump channels, a packer and flow pulsation generator, then viscoelastic mixtures are pumped through the tubing string, jet pump channels, a packer and a flow pulsation generator, after which the unpacking is carried out and the working fluid is supplied through the annulus and the jet pump to the tubing string to cause inflow. 2. A device for hydrodynamic effects on a formation containing a tubing string — tubing, an upper cylindrical body, a packer with a central channel separating the annulus with a sub-packer zone, a jet pump and a flow pulsation generator hydraulically connected to the central channel of the packer, characterized in that the jet pump is located with the nozzle up, the inlet of the jet pump for the working fluid is connected to the annulus through the check valves, and the outlet of the jet pump is connected to the pump mpressornyh pipes, wherein the jet pump comprises a cutter in the form of labyrinths oscillations, and the generator is located below the packer. 3. The device has a hydrodynamic effect on the formation, characterized in that between the packer and the oscillation generator there is a coupling with hydraulic channels communicating the central channel of the packer with the annulus in which the check valves are installed.

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