RU2206730C1 - Method of pulse-jet stimulation of well and producing formation and device for method embodiment - Google Patents

Abstract

FIELD: applicable in operation of oil, water and other wells. SUBSTANCE: method includes supply of active fluid medium through tubing string to jet device nozzle. Passive medium is pumped out by jet device from formation zone through tubing string. In this case, prior to performance of said operations, channels for intake of both media to jet device are closed by means of blocking insert installed in tubing string. Packers set to transportation state and well under-packer zone is treated with active zone with help of hydraulic pulse device with withdrawal of a part of medium through packer from well to surface. After completion of said treatment, packer is set to working position and blocking insert is replaced with depressive insert. Channels of input of active and passive media to jet device are isolated from each other. Passive medium is pumped out through check valve system installed on tubing string below packer. Used as hydraulic pulse device is pressure booster, with flat-jet head in lower part, installed below perforation of well zone. During treatment, pressure booster assembly is lifted along well to provide for formation of flat fan-shaped jets with pulse frequency of 50 to 300 per minute and pressure above 1.5-2.5 values of static pressure value in well at formation level. At each step of treatment, additional depression stimulation of formation is accomplished by means of pulse-depressing device installed on ground surface. Depression stimulation is realized under conditions of hydraulic impact and abrupt opening of well preliminarily loaded with pressure. Offered method is realized by device whose units are described above. EFFECT: higher well productivity. 2 cl, 5 dwg

Description

 The invention relates to the field of exploitation of oil, water and other wells and can be used to treat the bottom-hole zone of the formation using pulsed and downhole jet installations in order to increase the productivity of wells and increase rock permeability.

 A known method of influencing the well and the reservoir (see RF patent 2107814 C1, IPC E 21B 43/25, E 21 B 28/00, 03/27/1998), including the transmission of hydraulic pulses from the emitter of the hydraulic hammer installed on the mouth, through the pump compressor pipes (tubing) through its upper end and along a column of fluid in the borehole through its upper level to the reservoir, simultaneously with the transfer of molecular-wave vibrations in the borehole, increase pressure by supplying fluid from a pump with a pressure accumulator connected to the borehole input to the tubing , and created hydraulic shocks are generated in the liquid column in the well by periodically shutting off the pump inlet by the emitter of the hydraulic hammer while transmitting molecular-wave oscillations from it to the tubing and the liquid column in the well.

 The disadvantage of this method is that only part of the energy of the pulses will be effectively used to affect the cleaning zone.

 Since in the tubing and in the reservoir there are various components that limit the permeability of the bottomhole zone and the cross section of the tubing, there is a large spectrum of resonant frequencies of these components. For example, in pipes - paraffins, resins, tubing metal, adhering rock particles, in the formation - additionally the formation skeleton having different resonant frequencies, due to the different shape and size of the cracks, binding alumina. As a result of this, only a part of the pulse energy will be effectively used to influence the cleaning zone, since only some of the indicated elements, whose frequencies are in resonance with the pulse frequency, will absorb this energy.

 A device is known for impulse action on a well and a productive formation (see RF patent 2130110 C1, IPC E 21 V 28/00, E 21 V 43/25, 05/10/1999), operating by a method that includes transmitting hydraulic pulses from hydraulic hammer emitters installed at the mouth in the distribution chamber. The distribution chamber is installed vertically and communicated with an inlet with a pump and a pressure accumulator and an inlet with a connecting pipe communicated at the wellhead with tubing. At the same time, the pressure in the well is increased by supplying fluid from a pump with a pressure accumulator and a water tank. Both emitters in this way act on the medium synchronously and create one oscillation frequency.

 The disadvantage of this method is that a significant part of the energy of the pulses will be lost in the process of transferring it from the surface to the zone of the reservoir.

 A device is known for implementing a method of pulse action on a well and a productive formation (see RF patent 2107814 C1, IPC E 21 V 43/25, E 21 V 28/00, 03/27/1998), including a shock pulse generator with a hammer and emitters, a pump having a hydraulic connection with a distribution chamber connected to the internal cavity of the well, the emitter being installed coaxially with a sliding fit with the distribution chamber, with the possibility of blocking the outlet pipe of the pump.

 The disadvantage of this device is that although due to the increase in pressure in the bottomhole zone, the size of the cracks increases, as a result of which a certain separation of particles occurs, however, when the pressure decreases, the size of the cracks comes back to their previous state.

 In addition, due to the remoteness of the pulse generator from the cleaning zone, only part of the pulse energy will be effectively used to influence the cleaning zone.

 A known method of operation of a pump-ejector well installation, comprising supplying an active liquid medium through a tubing string, pumping out a passive medium from a formation zone, flushing a mixture of medium of a borehole zone and supplying a mixture of medium from a well to a surface (see ed. Certificate of the USSR 1100436 IPC F 04 F 5/02, 1982).

 In this method, the function of washing the well and the function of pumping the medium out of it are combined.

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

 A known method of operation of a pumping and ejection borehole pulse installation (see RF patent 2107842 C1, IPC F 04 F 5/54, 03/27/1998), comprising supplying active liquid medium to a nozzle of a jet apparatus through a tubing string and pumping out of the jet apparatus from the formation zone along the tubing string of the passive medium, while before the indicated operations using the blocking insert installed in the tubing string, the channels for supplying both media to the jet apparatus are blocked, the packer is brought into the transport system Charm and by means of a hydro-pulse device treat the borehole sub-packer zone with an active medium and divert part of the medium from the well to the surface through the packer, and after the end of this treatment, bring the packer into working position and replace the blocking insert with a depressive insert that isolates the active and passive medium supply channels from each other to the jet apparatus, moreover, the passive medium is pumped out through a system of peripheral check valves installed on the tubing string below the packer .

 However, in this method of work, in order to ensure the efficient use of the energy of the active liquid medium acting on the reservoir, it is necessary to create a cavitation mode in the near-bore sub-packer zone, which requires the fulfillment of certain operating conditions that cause the appearance of cavitation cavities, the collapse of which causes hydraulic shocks, the impact of which in addition to separation clogging particles can cause destruction of the structural elements of the well.

Closest to the claimed is the method of operation of a pumping and ejection well pulse installation (see RF patent 2138696 C1, IPC 6 F 04 F 5/54, 09/27/1999), in which an active liquid medium is supplied through a tubing string to a nozzle the jet apparatus and pumping out the reservoir zone from the formation zone along the tubing string of the passive medium, while before the indicated operations, using the blocking insert installed in the tubing tubing string, the channels for supplying both fluids to the jet are blocked at the apparatus, the packer is brought into a transport state and, using a hydro-pulse device, the near-bore sub-packer zone is treated with the active medium, with the part of the medium removed from the well to the surface through the packer, and after the end of this processing, the packer is brought into working position and the blocking insert is replaced by a depressive insert, isolating each other from each other, the channels for supplying active and passive media to the jet device, and the passive medium is pumped out through a system of peripheral check valves mounted on a on the tubing below the packer, as a hydroimpulse device, a pressure multiplier installed below the perforation of the borehole zone is used, which, during processing, is stepwise or smoothly raised along the well and processed with a frequency of generated pulses from 40 to 70 per minute and with a pressure value of 1, 5 to 1.7 value of static pressure in the wellbore at formation level, thus as the active liquid used nonaggressive liquid solutions or not more than 25 mm with kinematic viscosity ² / (25 centistokes, cSt) and a temperature not higher than 120 ^o C.

 The disadvantage of this method is the separation of the pulsed and jet effects in time, so, first they produce a pulse effect from the multiplier, and then they install a packer and pump out the reservoir zone from the reservoir zone along the tubing string of the passive medium.

 A device for implementing this method (see RF patent 2138617 C1, IPC 6 E 21 V 37/00, 28/00, 1998) contains an energy source and a molecular wave cavitator coupled to it, and the pulse generator consists of a hollow body and located in of a tubular rod with a piston and a valve mounted on the rod with the possibility of axial movement, the body is made with a bottom having a central hole and two peripheral ones located in the latter, in one - a throttle valve, and in the other - a check valve, in the side wall of the central part radial channels are made, the rod is installed in the central hole of the bottom of the body and is equipped with an end cover on the opposite side, overlapping its internal channel and forming a discharge chamber with the valve body and end, connected to the energy source and to the internal channel of the rod, and to the channel through radial holes in its side wall, located with the possibility of their overlapping by the valve wall during its working movement, and the valve by means of a spring placed in the cavity formed between the walls of the valve and the housing and connected to the discharge chamber, pressed against the end face of the piston with the formation in the contact zone of the cavity connected by means of an annular internal groove and radial holes in the piston wall to the radial channels of the side wall of the housing, while the molecular wave cavitator is made in the form of a glass attached open end face to the housing of the pulse generator along the periphery of its bottom, in the side wall of the glass made radial channels with a connecting peripheral annular groove, and the inner cavity of the glass is connected by means of said throttle and check valve with a pulse generator animation chamber formed between the end face of the piston and the bottom of its housing. In this case, the piston and valve are made in the form of bushings, the outer surface of each of which is formed by three cylindrical sections, the smallest external diameter of the piston on the side of the animation chamber being larger than the same diameter of the valve on the side of the pressure chamber.

 In this case, the device generates direct thin jets acting on perforations with a certain probability of getting on them and penetrating through them into the bottomhole formation zone.

 The disadvantage of this device is the low accuracy of jets entering the perforations, and for the implementation of animated static pressure, the need to install a packer to close the space between the casing and tubing in the animation zone.

 The objective of the invention is to increase the productivity of oil and gas wells put into operation, increase the injectivity of injection wells, restore and increase the coefficient of productivity and initial permeability of wells, while eliminating cavitation regimes that destroy the design of the multiplier.

 This problem is solved by the fact that in the method of pulse-jet treatment of a well and a productive formation, comprising supplying an active liquid medium through a tubing string to a nozzle of a jet apparatus and pumping a passive fluid tubing from a formation zone through a tubing string, before by the indicated operations, using the blocking insert installed in the tubing string, they block the supply channels of both media to the jet apparatus, bring the packer into transport state and wait Using a hydro-pulse device, an active medium is used to treat the borehole under-packer zone with a part of the medium removed through the packer from the well to the surface, and after the end of this treatment, the packer is brought into working position and the blocking insert is replaced by a depressive insert, isolating the channels for supplying active and passive media to the jet apparatus, and pumping out the passive medium through a system of check valves installed on the tubing string below the packer, as a hydro-pulse the devices use a pressure multiplier installed below the perforation of the borehole zone with a flat-bladed head in the lower part, which are stepped up along the well during processing and provide the generation of flat fan jets with a frequency of generated pulses in excess of 50 to 300 per minute and with a pressure in excess of 1.5 to 2, 5 values of the static pressure in the well at the level of the reservoir, and at each step of the treatment, an additional depressive effect on the reservoir is produced by a pulse-depression device VA, mounted on the surface, and this depressive effect is implemented in two modes - reverse water hammer and a sharp opening pre-pressure-loaded wells.

 A pulse-jet well installation for implementing a method of pulse-jet treatment of a well and a productive formation contains a depression-pulse device, a tubing string with a jet apparatus and a pressure multiplier with a flat jet head in the lower part, the jet apparatus is made with an active nozzle, a mixing chamber , a diffuser, a channel for supplying an active medium from the hydraulic unit and a channel for supplying a passive medium from the bottomhole zone, blocking and depressive inserts, under the jet app the packer, the check valve system and the pressure multiplier are installed in series, while the depression-pulse device is mounted on the surface and consists of a discharge chamber, in which the plunger and spring-loaded sleeve are mounted with the possibility of moving and locking mating, and the stroke of the plunger is limited by alternately mounted clamps, and its movement is carried out by means of a hydraulic cylinder with a spring-loaded piston and with the possibility of hydraulic closure of the piston cavity by a hydraulic lock with by control from the control valve with a feed from a hydraulic pump connected to the tank, the discharge chamber having a free drain outlet to the drain tank, and the pressure multiplier consists of a housing in which the piston and spring-loaded valve, as well as the central hollow rod, are coaxially located, the spring-loaded valve on the side of the larger stage has an end conical surface, which, in conjunction with the end part of the larger stage of the piston, forms a chamber having an alternating hydraulic connection with an annular space by means of a cavity and radial channels, between the central hollow rod and the housing, an injection chamber is formed, designed to supply an active liquid medium and to enhance the return of the spring-loaded valve, a control chamber is made in the central part of the housing to form an oscillating animation process, which has a constant hydraulic connection with the discharge chamber through the axial channel, between the outer surface of the lower stage of the spring-loaded valve and the inner surface of the housing a drain chamber is formed, which has a constant hydraulic connection through the radial channel with the annulus, and a multiplication chamber is formed between the outer surface of the lower piston stage and the inner surface of the housing, which is hydraulically connected to the inner cavity of the central rod and alternately hydraulically connected through radial channels in the central rod with a discharge chamber, the diameter of the lower stage of the piston being larger than the diameter of the lower stage of the spring-loaded valve, the housing is multiple the pressure cassette is connected to the planar jet head through the adapter, and the planar jet itself consists of a body, a piston, spring loaded with elastic elements, while the piston has the possibility of axial movement by sliding along the outer surface of the cylindrical sleeve located on the shaft part of the housing, and the necessary tightening force to move the piston is regulated by preliminary deformation of the elastic elements through the embedded part and the washer by means of a nut and is determined by the pressure in the animation chamber, from where the liquid active medium is supplied through the axial channels of the flat-jet head housing and acts on the annular area on the end surface of the spring-loaded piston, which when moving opens an expanding radial channel around the perimeter for the exit of plane jets.

In FIG. 1 shows a pulse-jet well installation during a hydro-pulse treatment of a well using a pressure multiplier;
figure 2 - during the period of reverse hydroblow ("prolonged" wave action on the reservoir from the surface);
in FIG. 3 - during the period of abrupt opening of a pre-pressure-loaded well (depression "discharge" of the well);
figure 4 - during the pumping medium from the well;
figure 5 - pressure multiplier with a flat-bladed head for pulse processing.

 A pulsed-jet downhole installation designed to implement the described method of operation comprises a depression-pulse device and a tubing string 1 with an installed jet apparatus with an active nozzle 2, a mixing chamber 3, a diffuser 4, an active medium supply channel 5 from the installed on the surface of the hydraulic unit (pump) 6 and the channel 7 for supplying a passive medium from the bottom-hole zone. Under the inkjet apparatus, a packer 8, a system of check valves 11 and a pressure multiplier 9 are sequentially installed with a flat-jet head 10 located in its lower part, located before the implementation of the method below the perforation of the borehole zone. The installation is also equipped with a blocking insert 12 (Fig. 1). The blocking insert 12 is installed with the possibility of replacing it depending on the operation performed on the depressive insert 13 (figure 4). Moreover, the channels 5 and 7 of the supply of active and passive media to the jet apparatus are blocked when the blocking insert 12 is installed by the walls of the latter, and when the depressive insert 13 is installed, these channels are open, but isolated from each other by overlapping the cross section of the column 1 of the tubing with the wall of the depressive insert 13. A depression-pulse device is installed on the surface, consisting of a discharge chamber 14 connected to the annular space 31 (Fig. 4), in which a lock and a lock are mounted Vågå mating spring-loaded plunger 15 and the sleeve 16 (Figure 2). In this case, the stroke of the plunger 15 is limited by alternately mounted clamps 17, at a distance a, and 18 at a distance b. The plunger 15 is driven by a hydraulic cylinder 19 with a spring-loaded piston 20 and with the possibility of hydraulic closure of the piston cavity with a hydraulic lock 21 (Fig. 1) controlled by a control valve 22 with a feed from a hydraulic pump 23 connected to the tank 24. The discharge chamber 14 has a drainage hydraulic outlet drain tank 25.

The pressure multiplier 9 (Fig. 5) consists of a housing 26 in which a piston 27 is arranged coaxially, having smaller and larger stages, a spring-loaded valve 28 also having smaller and larger stages and a central hollow stem 29 with an outer diameter d ₁ . The valve 28, from the side of the larger stage, has an end conical surface, which, in conjunction with the end part of the larger stage of the piston 27, forms a chamber 30, which is alternately hydraulically connected to the annular space 31 through the cavity 32 and radial channels 33 and 34. Between the central rod 29 and the housing 26 is formed by the injection chamber 35, designed to supply an active liquid medium and to enhance the return of the valve 28.

In the central part of the housing 26, a control chamber 36 is made in which an oscillatory animation process is formed. The control chamber 36 is in constant hydraulic communication with the discharge chamber 35 through the axial channel 37. Between the outer surface of the lower stage of diameter d _{3 of the} valve 28 and the inner surface of the housing 26, a drain chamber 38 is formed, which has constant hydraulic communication through the radial channel 39 with the annular space 31. In addition to addition, the pressure booster 9 are animation chamber 40 formed between the outer surface of the lower stage with diameter d ₂ of the piston 27 and the inner surface of the housing 26. The camera animated 40 is in fluid communication with the interior of the central shaft 29 and the alternate hydraulic communication through radial passages 41 in the central rod 29 with the discharge chamber 35.

The diameter d _{2 of the} smaller piston stage 27 is larger than the diameter d _{3 of the} smaller valve stage 28. The larger piston stage 27 has a diameter d ₄ , so that d ₄ > d ₂ > d ₃ .

 The pressure multiplier 9 is connected to the flat-head 10 through the adapter 42. The flat-head 10 consists of a housing 43, a piston 44, spring loaded with elastic elements 45, for example, a disk spring section. The piston 44 has the possibility of axial movement by sliding along the outer surface of the cylindrical sleeve 46 located on the pivot part 47 of the housing 43. The force required to move the piston 44 is regulated by pre-deformation of the elastic elements 45 by tightening, through the embedded part 48 and the washer 49, nut 50. After the required tightening nut 50 is rigidly locked by the pin 51. The required tightening force is determined by the magnitude of the pressure of the animation in the animation chamber 40. In this case, the liquid active medium is supplied through axial channels 52 of the housing 43 of the flat-jet head 10, and acts on the annular area on the surface 53 of the spring-loaded piston 44, which when moving opens an expanding radial channel 54 along the perimeter of the piston 44, through which the output of the flat jets, which together form a flat cavitation radial centrifugal pulsating, with multiplier response frequency, flow.

 The method of operation of a pulse-jet downhole installation is as follows.

An active liquid medium is supplied through a column 1 of tubing (tubing) under pressure to a pump-ejector unit, using non-aggressive liquids or solutions with a kinematic viscosity of not more than 25 mm ² / s (25 centistokes) and a temperature of not higher than 120 ^o C, for example, oil, unsaturated kerosene, aqueous solutions of acids (up to 8%), except for HP, saline solutions, etc.

 Under operating pressure, the active liquid medium through the column 1 enters the pressure multiplier 9, which is installed below the perforation of the borehole zone. At this stage of the installation, the blocking insert 12, previously installed in the jet apparatus with an active nozzle 2, prevents the medium from entering the active medium supply channel 5 and the passive medium supply channel 7. At the same time, under the influence of the pressure of the active medium, its passage through the check valve system 11 is closed. In this case, the packer 8 is brought into a transport state (not repackaged) and does not prevent the medium from flowing between the sub-packer and over-packer zones. The active liquid enters through the tubing string into the pressure multiplier 9 into the pressure chamber 35, and from it, through the axial channel of the central rod 29, into the animation chamber 40, and also through the axial channel 37 to the control chamber 36.

The prestressed elastic elements 45 press the piston 44 against a part of the housing 43 and provide an annular contact of the piston 44 with a part of the housing 43 and block the outward flow of the working fluid. This will cause an increase in pressure in the chamber 40 and, thus, a pressure differential will be created between the discharge line and the annulus 31. The pressure in the chamber 40 acts on the end face of the piston 27, and on the opposite side, the same pressure acts on the end face of the valve 28, thereby contributing to the coupling of the piston 27 and the valve 28. Moreover, in the formed cavity 30, the pressure is equal to the annular size due to the communication of this cavity through the channels 33 and 34 with the annular space 31. Since the outer diameter d _{2 of the} end face of the lower pore stage is structurally If the shaft 27 is made larger than the outer diameter d _{3 of the} end face of the smaller stage of the valve 28, then when the pressures are equal at these ends, the resulting platoon force of the conjugated piston 27 and the valve 28 arises, which causes them to move towards the pressure chamber 35. With a certain movement, the radial channel 33 in the area of the control chamber 36 and in the cavity 30, the pressure will increase and the discharge pressure level, which will cause the piston 27 and the valve 28 to undock. After undocking, the valve 28 will continue to move in the same direction and block the holes I am 41 in the central stem 29, thus cutting off the animation camera 40 from the discharge line. Then the entire fluid flow will enter the control chamber 36 through the axial channel 40. The discharge pressure acting on the end face of the larger piston stage 27 will increase the pressure in the animation chamber 37 to a value determined by the multiplier k _m (the ratio of the ends of the larger and smaller piston stages 27 ) Thus, the multiplier
k _m = (d ₄ ² -d ₁ ² ) / (d ₂ ² -d ₁ ² ),
where d ₁ is the outer diameter of the Central hollow rod 29;
d ₂ - the outer diameter of the lower piston stage 27;
d ₄ - the outer diameter of the larger piston stage 27.

 The multiplier provides from 1.5 to 2.5. The pressure of the animation, acting on the annular surface area 53 of the piston 44, will cause it to move towards the elastic elements 45, open the channel 54 and the liquid with increased pressure will process the annulus 31. When the piston 27 occupies a position in which the channels 33 and 34 are combined, the pressure in the control chamber 36 drops sharply and the valve 28 under the action of the spring again contacts the piston 27. The animation chamber 40 through the openings 41 is hydraulically connected to the discharge line and the pressure in the animation chamber tion 40 will also plummet. In this case, the elastic elements will return the piston 44 to its original position and, accordingly, the channel 54 will be closed. After the piston 27 and valve 28 are joined, the cycle repeats, i.e. provides a pulsating effect of the active medium on the annulus 31.

 The pressure multiplier 9 and the flat-head 10 are operated by pumping active liquid medium through them for 20-30 minutes at a single flow rate (3-6 l / s), and then the flow rate is gradually increased approximately twice (6-12 l / s ) The treatment is started by setting the flat-jet head 10 (its output channel) below the perforation of the near-wellbore zone (about 2 meters), and then it is stepwise lifted along the well and processing is performed with a frequency of generated pulses in excess of 50 to 300 pulses per minute and with a pressure value of over 1 , 5 to 2.5 values of static pressure in the well at the reservoir level. The operating time, depending on the mechanical properties of the collector, is usually 90-120 minutes per 1 meter of perforation interval.

 At each processing step, an additional depressive effect is produced on the formation by means of a pulse depressive device installed on the surface, and this depressive effect is implemented in two modes. In the first mode (reverse water hammer), the latch 17 is installed at a distance a from the end of the stage of the plunger 15 (figure 2). In the initial position, using the hydraulic cylinder 19, the plunger 15 is pressed against the sleeve 16 and seals the well. Next, the piston cavity of the hydraulic cylinder 19 is closed by a hydraulic lock 21 and, using the pump unit 6, the pressure rises to the set value of 10 ... 15 MPa. Then, using the distributor 22, the hydraulic lock 21 is turned off, connecting the piston cavity of the hydraulic cylinder 19 with a drain. Structurally connected, the spring-loaded piston 20 and the plunger 15 under the action of the spring and borehole pressure, respectively, sharply move a distance a, opening the borehole for a short period of time. In this case, the fluid will begin to move at high speed in the formed gap between the plunger 15 and the sleeve 16. The sleeve 16, under the action of its own spring and hydraulic pressure in the well, will also move by a value or a little more (which is provided by the design) and abuts sharply with the plunger 15. A sharp shutoff of the fluid flow from the well will cause a reverse water hammer, which will propagate into the well (Fig. 2) and will act with a hydrostatic impulse on the bottomhole zone.

 The second mode of operation of the pulse-depression device (abrupt opening of a pre-loaded well pressure) is associated with the movement of the plunger 15 by a distance b when the latch 18 is installed (Fig. 3). The movement of the sleeve 16 is limited by the distance a, for example, the use of a retaining ring and, therefore, since a> b, a constant open communication of the well with the chamber 14 and the capacity 25 is ensured.

 Due to the presence of fluid in the well pores, the generated pulse-depressive loads propagate in the near-wellbore zone of the formation. As a result, mechanical disturbances occur in the porous medium, softening of the sizing material and clay inclusions occurs, particles contaminating them are introduced from the walls of the pore channels, introduced into the pores both at the stage of drilling the well (particles of the drilling fluid) and at the stage of operating the well (when killing the well and other operations). During operation, the presence of suspended particles in the extracted fluid from the well is monitored. At the end of the treatment, the pressure multiplier is raised by about two meters (see RF patent 2130110 C1, IPC E 21 V 28/00, E 21 V 43/25, 05/10/1999) above the upper perforation holes, then the well is plugged, the injection line is dismantled, mount the fountain fittings, lift back the blocking insert 12 by backwashing, dismantle the fountain fittings and install the packer (bring it into working position), and the depressant insert 13 is installed in the jet apparatus, isolating from each other the supply channels 5 and 7 to the jet apparatus of FIG. 4) . Then, by pumping the active medium through the jet apparatus in the near-wellbore zone, depression is created, causing an inflow of passive liquid medium from the reservoir and, thus, suspended particles are washed out from the near-wellbore zone, and the passive medium is pumped out through a system of check valves 11 installed on pump column compressor pipes below packer 8.

Claims (2)

 1. A method of pulse-jet action on a well and a producing formation, comprising supplying an active liquid medium through a tubing string to a nozzle of a jet apparatus and pumping out a passive fluid from a formation zone through a tubing string by a jet apparatus, before doing so with using a blocking insert installed in the tubing string, they block the channels for supplying both media to the jet apparatus, bring the packer into a transport state, and by means of a hydro-pulse the structures treat the near-bore sub-packer zone with the active medium with the part of the medium removed through the packer from the well to the surface, and after the end of this treatment, the packer is brought into working position and the blocking insert is replaced by a depressive insert, isolating the supply channels of the active and passive media to the jet device from each other, moreover, the passive medium is pumped out through a system of check valves installed on the tubing string below the packer; The pressure multiplier set below the perforation of the borehole zone with a flat-jet head in the lower part, which is stepped up along the well during processing and provides the generation of flat fan jets with a pulse frequency of more than 50 to 300 per minute and with a pressure of more than 1.5 to 2.5 static pressure in the well at the reservoir level, and at each step of the treatment, an additional depressive effect is produced on the reservoir by means of a pulse-depression device installed on the surface and, moreover, this depressive effect is realized in two modes - reverse hydraulic shock and sudden opening of a pre-loaded well pressure.  2. A pulse-jet well installation, contains a depression-pulse device, a tubing string with a jet device and a pressure multiplier with a flat jet head in the lower part, the jet device is made with an active nozzle, a mixing chamber, a diffuser, an active medium supply channel from the hydraulic unit and a channel for supplying a passive medium from the bottomhole zone, blocking and depressive inserts, a packer, a check valve system and a pressure multiplier are sequentially installed under the jet apparatus In this case, the depression-pulse device is mounted on the surface and consists of a discharge chamber, in which the plunger and spring-loaded sleeve are mounted with the possibility of displacement and lock mating, the stroke of the plunger being limited by alternately mounted clamps, and its movement is carried out by means of a hydraulic cylinder with a spring-loaded piston and with the possibility of hydraulic closure of the piston cavity with a hydraulic lock controlled by a control valve with a feed from a hydraulic pump connected to the tank, and to the discharge measure has a drainage free outlet to the drain tank, and the pressure multiplier consists of a housing in which the piston and the spring-loaded valve are located coaxially, the central hollow stem, the spring-loaded valve on the side of the larger stage have an end conical surface, which articulating with the end part of a larger piston stage forms a chamber having an alternating hydraulic connection with the annulus by means of a cavity and radial channels between the central floor A throttle rod and a housing are formed of a discharge chamber designed to supply active liquid medium and to enhance the return of a spring-loaded valve. In the central part of the housing there is a control chamber for generating an oscillatory process of animation, which has a constant hydraulic connection with the discharge chamber through an axial channel between the outer surface of a lower stage a spring-loaded valve and an inner surface of the housing, a drain chamber is formed, having a constant hydraulic connection through a radial channel with an annular space, and between the outer surface of the lower piston stage and the inner surface of the housing, a multiplication chamber is formed, having a hydraulic connection with the inner cavity of the central rod and alternating hydraulic communication through radial channels in the central rod with the discharge chamber, the diameter of the lower piston stage being larger than the diameter of the lower stage of the spring-loaded valve, the housing of the pressure multiplier is connected to the flat-jet head through the adapter, and the plane itself the rudder head consists of a housing, a piston, spring-loaded with elastic elements, while the piston has the possibility of axial movement by sliding along the outer surface of the cylindrical sleeve located on the pivot part of the housing, and the necessary tightening force to move the piston is regulated by preliminary deformation of the elastic elements through the embedded part and the washer by means of a nut and is determined by the pressure in the animation chamber, from where the liquid active medium is supplied through the axial channels of the pl Oscillating head and acts on the annular area on the end surface of the spring-loaded piston, which when moving opens an expanding radial channel around the perimeter for the exit of flat jets.

Images