RU2591065C2 - Apparatus for pumping liquid from top into lower well formations (versions) - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: group of inventions can be used for pumping a liquid from upper water-flooded formation into lower oil well formations. Apparatus according to first version comprises a flow column, a packer with two anchor devices of oppositely directed action, disconnecting interstratal space of well, and a rotary pump connected by input to over-packer space and by output to below-packer, including an electric drive with a sealed power supply cable entry, passing through wellhead flange with cable entry, provided with telemetry unit connected via cable with a control station. Pump is tightly connected by output to a telescopic fitting assembly with barrel packer. In apparatus according to second version, packer installed between oil bearing formations is made with downhole anchor device, and packer, between upper petroliferous and water cut formations, with support anchor device. Flow columns at level of oil-bearing beds are connected by flow and bottomhole well chambers, on inner side walls of which there is a circular recess, at level of latter in wall there are radial through holes overlapped with replaceable cylindrical insert with throttle holes in wall, metering flows of liquid from cavity of tubing in oil-bearing formations through inter-packer and below-packer space of well. At free end face of chamber there is a sludge collector, blocking flow channel of cylindrical insert. In apparatus according to third version, flow and downhole well chambers comprise hydraulic throttles, equipped with unit of telemetry system connected by electric communication cable to telemetry unit of automatic or manual control via power supply cable from panel to control station of well with possibility of adjusting volume of fluid injection into oil well formations. Flow chamber is provided with eccentric longitudinal channel communicating cavity of tubing. Telescopic fitting assembly is equipped with an electrical connector of a communication cable, which provides separate lowering and lifting of centrifugal pump and packer with hydraulic throttles.

EFFECT: higher reliability of well operation.

3 cl, 3 dwg

Description

The group of inventions relates to the field of mining, in particular to the oil industry, and can be used for pumping fluid from the upper flooded reservoir into the lower oil-bearing strata of the well.

A device for inter-reservoir water pumping is known, comprising a well, a tubing string with a downhole pump unit in the form of a multi-stage centrifugal pump with a submersible electric motor, a power cable, a ground-based power supply, control and monitoring unit, a packer for separating the wellbore between the water supplying and receiving water layers . The pump inlet is hydraulically connected to the first of these layers, and the outlet to the second. The device is equipped with an downhole assembly to ensure a minimum content of mechanical impurities, a downhole downstream transducer of water flow into a sequence of information electrical signals and a wired telecommunication channel with a ground-based unit for calculating the flow, content of mechanical impurities and accounting for the amount of water, which is connected to the power supply, control and monitoring unit. (Patent RU No. 44349 U1 for a utility model. An inter-reservoir water pumping device and a downhole flow transducer for this device. IPC E21B 47/10, G01F 1/06. Published. 03/10/2005. Patent RU No. 2278969 C1 for an invention. An inter-reservoir device water pumping and downhole borehole flow transducer for this device IPC E21B 47/10, G01F 1/06. Published on June 27, 2006.) A disadvantage of the known installation is the design complexity.

A known installation for pumping fluid from the upper reservoir into the lower reservoir of the well with the possibility of sealing the wellhead, comprising a packer, deflated on a pipe string equipped with a bypass channel and a suction valve at the end, and an electric submersible pump as a part of the pipe string mounted above the suction valve and below the bypass a channel through which the cavity of the pipe string above the pump communicates with the lower reservoir. The packer hermetically divides the annulus of the well into two parts: above and below the packer. At the same time, the cavity of the pipe string below the pump has the ability to communicate with the upper layer when pumping liquid from the annulus above the packer - the zone of the upper layer - into the lower layer by the pump. Between the pump and the suction valve, a fluid pressure sensor is installed in the upper aquifer in the annulus with the possibility of turning the pump on and off. (Patent RU No. 2278673 C1. Installation for pumping fluid from the upper formation into the lower formation of the well. IPC E21B 43/14. Published on November 20, 2006.) A disadvantage of the known installation is the design complexity.

A known installation for pumping fluid from the upper layer of the well to the bottom with filtration, including two packers, a disconnector, an anchor, a flow meter, a pump, valves and a filter, lowered into the well on a pipe string. A column disconnector is installed above the bottom packer. The pipe string is equipped with a hydraulic anchor and an inverted-type electric centrifugal pump installation containing a flowmeter, a moisture meter, an electric centrifugal pump, a submersible electric motor, a pressure sensor, and a temperature sensor, above which there is an injection valve with an upper packer with a cable entry above it. In the pipe string, a retrievable flow distribution device is installed, consisting of a housing, a fishing head, a landing seat and plugs. In the body of the flow distribution device, several channels for flushing and pumping are made. On the outer surface of the flow distribution device there is a groove for laying the cable. Above the flow distribution device, a retrievable liquid purification device is installed, including a sludge trap, a filter, a seat saddle and a fishing head passed through a full bore bypass valve installed in the upper part of the installation, the fishing head of the liquid cleaning device is located above the bypass valve. The lower packer is made of mechanical action. The top packer - with cable gland hydromechanical action. The lower part of the installation is made with an open end in the form of a funnel or a liner and is equipped with a shut-off valve. (Patent RU No. 2485293 C1 for the invention. The method of downhole pumping and installation for pumping fluid from the upper layer of the well to the bottom with filtration. IPC E21B 43/14. Publish. 06/20/2013.) A disadvantage of the known installation is the low efficiency of pumping fluid in the well.

Known pumping unit for pumping water in the well from reservoir to reservoir, consisting of tubing and a pump installation containing a compensator, a submersible motor with a cable connected to the sectional pump through a tread, check valve, borehole metering unit for flow, temperature, vibration and pressure with a communication line docked to the bottom of the pump through a non-return valve, and a docking station connecting the pumping unit with a packer located above the roof of the oil reservoir. The electric motor is located in the upper part of the pump installation and is equipped with clamps to protect the communication line of the metering unit for flow, pressure, vibration, temperature. The number of pump sections is related to the discharge pressure. (Patent RU No. 131069 U1 for a utility model. A pumping unit for pumping water in a well from a formation to a formation. IPC E21B 43/00. Published on 08/10/2013.) A disadvantage of the known installation is the design complexity that affects the efficiency of pumping fluid from a watered formation. into the oil reservoirs of the well.

The closest analogues of the claimed invention are installations for downhole pumping of water from the upper layer to the lower one, containing a column of elevator pipes, a packer separating the aquifer and the productive layer, and an inverted electric centrifugal pump, the inlet of which is in communication with the over-packer space, and the outlet is with a shank with under-packer space. The pump motor is placed in a sealed casing, communicated from below with the pump inlet, and from above with an elevator column, in which a hole is made above the casing for communication with the packer space. The pump may also be located inside the casing. (Patent RU No. 77900 U1 for a utility model. Installation for downhole pumping of water from the upper layer to the lower. IPC E21B 43/20. Publish. 10.11.2008. Patent RU No. 131802 U1 for a utility model. Installation for downhole pumping of water from the upper aquifer formation in the lower productive. IPC E21B 43/14. Published. 08.27.2013.) This invention is taken as a prototype.

A disadvantage of the known installation is the low efficiency of pumping fluid from the upper formation into the lower layers of the well due to the complexity of the design of the installation.

The main task to be solved by the claimed invention is directed is to simplify the design of the installation and improve the dosage of pumping fluid from the upper flooded formation into the lower oil-bearing strata of the well.

The technical result is to simplify the design and increase the efficiency of pumping fluid from the upper flooded reservoir into the lower oil-bearing strata of the well.

The specified technical result is achieved by the fact that in the known installation for pumping fluid from the upper to the lower layers of the well, in the first embodiment, containing a string of lift pipes, a packer separating the interstratal space of the well, and a centrifugal pump communicating with the inlet of the overpacker space and the outlet with subpacker, including an electric drive with a sealed input of a power cable connected to a control station, while the pump outlet is hermetically connected by a telescopic docking unit to the barrel akera with the possibility of their separate descent into the casing of the well and lifting of the string of elevator pipes hermetically passed through the wellhead flange with a cable entry, according to the proposed technical solution, the electric drive is equipped with a telemetry unit, by which the centrifugal pump is connected to the string of elevator pipes at the level of the flooded wellbore, and the packer made with two anchor devices of the opposite direction.

The specified technical result is achieved by the fact that in the known installation for pumping fluid from the upper to the lower layers of the well, in the second embodiment, containing a string of lift pipes, a packer that divides the interstratal space of the well, a centrifugal pump communicating with the inlet with the overpacker space and the outlet with the underpacker space comprising an electric drive with a sealed input of a power cable connected to a control station, while the pump outlet is hermetically connected by a telescopic docking unit to the barrel according to the proposed technical solution, the electric actuator is equipped with a telemetry unit, by which a centrifugal pump is connected to the tubing string at the level of the flooded wellbore, and the packer installed between the oil-bearing strata is made with a supporting anchor device, and between the upper oil-bearing and flooded strata the packer is made with a locking anchor device, while the elevator pipes at the level of oil reservoirs are connected by flowing and downhole chambers, on the inner side of the wall of which an annular recess is made, at the level of the latter, radial flow openings are made in the wall, overlapped by a replaceable cylindrical insert with throttle openings in the wall communicating with the annular recess dosing fluid flows from the cavity of the elevator pipes into the oil-bearing strata through the inter-packer and sub-packer spaces of the well, for which purpose at the free end hydrochloric camera chip catcher installed, blocking the flow passage of the cylindrical insert.

The specified technical result is achieved by the fact that in the known installation for pumping fluid from the upper to the lower layers of the well, in the third embodiment, containing a string of lift pipes, a packer that separates the interstratal space of the well, and a centrifugal pump communicating with the inlet with the overpacker space and the outlet with subpacker, including an electric drive with a sealed input of a power cable connected to a control station, while the pump outlet is hermetically connected by a telescopic docking unit to the barrel packer with the possibility of their separate descent into the casing of the well and lifting a string of lift pipes hermetically passed through the wellhead flange with a cable entry, according to the proposed technical solution, the electric drive is equipped with a telemetry unit, by which the centrifugal pump is connected to the string of lift pipes at the level of the flooded wellbore, and the packer installed between the oil reservoirs is made with a supporting anchor device, and between the upper oil and flooded reservoirs the packer is made with a locking anchor device, while the elevator pipes at the level of oil reservoirs are connected by flowing and downhole chambers, an annular recess is made on the inner side of the wall, at the level of the latter, radial flow openings are made in the wall, which are blocked by a housing of a hydraulic throttle installed in the borehole chambers and communicating with output channels with an annular recess, while the hydraulic chokes are equipped with a telemechanical system unit with the possibility of automatic control, connected by an communication cable between each other and with the telemetry unit of the electric drive or manual control via the power cable from the control panel functionally connected to the well control station, and the body of the hydraulic choke of the flow chamber is made with an eccentric longitudinal channel communicating the cavity of the lift pipes with the possibility of regulating the volume of fluid injection from flooded formation in oil-bearing strata of the well, and the telescopic docking unit is equipped with an electrical connector of the communication cable, providing vayuschim separated descent centrifugal pump chambers and packers in the well casing and separate lifting column of tubing.

The analysis of the prior art cited by the applicant made it possible to establish that there are no analogues that are characterized by sets of features that are identical to all the features of the group of declared variants of installations for pumping fluid from the upper to the lower layers of the well. Therefore, the claimed technical solutions meet the condition of patentability "novelty."

The results of the search for known solutions in this technical field in order to identify features that match the distinctive features of the claimed variants of the technical solutions from the prototype have shown that they do not follow explicitly from the prior art. From the prior art determined by the applicant, the influence of the transformation provided for by the essential features of the claimed technical features on the achievement of the specified technical result is not revealed. Therefore, the claimed technical solutions meet the condition of patentability "inventive step".

The claimed technical solutions are tested and implemented in oil wells. Therefore, the claimed options for installations for pumping fluid from the upper to the lower layers of the well correspond to the patentability condition "industrial applicability".

In the present application for the grant of a patent, the requirement of the unity of the invention is met, since the claimed installation options for pumping fluid from the upper to the lower layers of the well solve the same problem - dosed pumping of liquid from the upper flooded layer to the lower oil-bearing strata of the well.

In FIG. 1 shows the installation for pumping fluid from the upper to the lower layers of the well, the first option; in FIG. 2 - the same, second option; in FIG. 3 - the same, third option.

The installation for pumping fluid from the upper to the lower layers of the well according to the first embodiment comprises a column of elevator pipes 1, a packer 2 with two oppositely directed actions, the anchor device 3 and the locking anchor device 4, disconnecting the inter-reservoir space of the well into the above-pack space 5, communicating with the flooded reservoir I , and the under-packer space 6 in communication with the oil-bearing formation II, and the centrifugal pump 7 in communication with the inlet with the over-packer space 5, and the output with the under-packer space 6 without the packer barrel 2, hermetically connected to the outlet of the pump 7 by a telescopic docking unit 8 with the possibility of separate lowering into the casing 9 of the well and lifting them by a string of elevator pipes 1, hermetically passed through the wellhead flange 10 with cable entry 11. The centrifugal pump 7 includes a receiving module 12 and an electric drive 13 with a telemetry unit 14, with which the pump 7 is connected to the column of elevator pipes 1 and to the power cable 15 connected to the control station (SU) (FIG. one).

In the installation according to the second embodiment, the packer 16, uncoupling the borehole space between the oil reservoirs II and III, is made with a supporting anchor device 3, and the packer 17, the uncoupling borehole space between the upper oil reservoir III and the flooded formation I, is equipped with a locking anchor device 4. Lift the pipes 1 at the level of the oil reservoir III are connected by a flowing borehole chamber 18, and at the level of the oil reservoir II are connected by a borehole chamber 19. An annular recess 20 is made on the inner side of the walls of the borehole chambers 18, at the level of a cat In the wall, radial flow openings 21 are made, overlapped by a replaceable cylindrical insert 22 with a flow channel 23 and throttle openings 24 in the wall, communicating with the annular recess 20, dispensing fluid flows from the cavity of the lift pipes 1 to the oil reservoirs II and III through the under-packer space 6 and interpacker space 25 wells, respectively. The flow channel 23 in the cylindrical insert 22 is blocked from below by a sludge collector 26 mounted on the free end of the face-hole chamber 19 (Fig. 2).

In the installation according to the third embodiment, the flowing and downhole borehole chambers 18 and 19 contain hydraulic throttles 27 equipped with a telemechanical system unit 28 with automatic control, connected by an electric communication cable 29 to each other and to a telemetry unit 14 of the electric drive 13 or manual control via the power cable 15 of the panel control (PU), functionally associated with the SU well with the ability to control the volume of fluid injection into the oil strata of II and III wells. On the inner side of the wall of the borehole chambers 18 and 19, an annular recess 20 is made, at the level of which radial flow openings 21 are made in the wall, overlapped by the body of the hydraulic throttle 27 with output channels 30 communicating with the annular recess 20. The body of the hydraulic throttle 27 of the flow borehole chamber 18 is made with an eccentric longitudinal channel 31, communicating the cavity of the elevator pipes 1 above and below the flow chamber 18. The telescopic docking unit 8 is equipped with an electrical connector 32 of the communication cable 29, providing start-up and lifting of the centrifugal pump 7, and the packers 16 and 17 with hydraulic throttles 27 alone (Fig. 3).

Installations for pumping fluid from the upper to the lower layers of the well operate as follows.

The submersible centrifugal pump 7 is launched into operation, supplying power to the submersible electric drive 13 through the power cable 15 from the SU. Electric 13 fluid from the flooded reservoir I by a centrifugal pump 7 is pumped into the oil reservoir II and III.

According to the first embodiment of the installation, the liquid from the flooded formation I through the overpacker space 5 enters the receiving module 12, from which it is pumped through the telescopic docking unit 8 and the packer barrel 2 to the subpacker space 6 and then to the oilfield II through the telescopic docking unit 7. The fluid from the overpacker space 5 is pumped under pressure into the oil reservoir of the II well under the control of the telemetry unit 8, the latter responds to the liquid level in the overpacker space 5 and to the pressure in the flooded reservoir of the first well. According to the reaction of the telemetry unit 8, the latter, if necessary, turns off or turns on the power supply of the electric drive 13 and transmits a signal via the power cable 15 to the SU well (Fig. 1).

According to the second embodiment of the installation, the liquid from the flooded reservoir I through the over-packer space 5 sequentially enters the receiving module 12, from which the centrifugal pump 7 through the telescopic docking unit 8 and the packer barrel 17 flows sequentially through the lift pipes 1 into the flow-through borehole chamber 18, then through the flow channel 23 of the replaceable cylindrical insert 22 through the lift pipes 1 and the packer barrel 16 into the downhole borehole chamber 19, at the free end of which a sludge collector 26 is installed, blocking the groove the channel 23 in the replaceable cylindrical insert 22. From the flowing well chamber 18, the fluid through the throttle openings 24, the annular recess 20 and the radial flow openings 21 under pressure enters the interpacker space 25 and is pumped into the oil reservoir III of the well. From the bottomhole borehole chamber 19, the liquid through the throttle holes 24 in the replaceable cylindrical insert 22, the annular recess 20 and the radial flow holes 21 under pressure enter the under-packer space 6 and pump it into the oil reservoir II of the well. In order to avoid clogging of the throttle openings 24 in the replaceable cylindrical insert 22, the sludge present in the pumped liquid falls into the sludge collector 26. Dosing of fluid flows into the oil-bearing strata II and III is achieved by changing the cylindrical inserts 22 in the chambers 18 and 19, characterized by the clearance of the throttle openings 24. Fluid injection into the oil-bearing strata of the II and III wells is carried out under the control of the telemetry unit 8, the latter responds to the liquid level in the over-packer space 5 and to the pressure in the flooded formation of the first well. According to the reaction of the telemetry unit 8, the latter, if necessary, turns off or turns on the power supply of the electric drive 13 and transmits a signal via the power cable 15 to the control system (Fig. 2).

According to the third embodiment of the installation, the liquid from the flooded formation I through the over-packer space 5 enters the receiving module 12, from which the centrifugal pump 7 through the telescopic docking unit 8 and the packer barrel 17 flows through the lift pipes 1 into the flow-through well chamber 18 at the level of the oil reservoir III . Then part of the fluid enters the channel of the hydraulic throttle 27 of the flow chamber 18, and part through the flow channel 31 in the housing of the hydraulic throttle 27, through the lift pipes 1 and the packer barrel 16 into the downhole borehole chamber 19 at the level of the oil reservoir II and the hydraulic throttle 27. Then through channels of hydraulic throttles 27, with the response of the blocks of the telemechanical system 28 to the parameters of fluid injection or transmission of control signals to the control unit functionally connected with the control unit via an electric communication cable 29 and power cable 15, herme flowing through the wellhead flange 10, the liquid is dosed from the cavity of the lift pipes 1 into the oil-bearing strata III and II through the interpacker space 25 and the under-packer space 6 of the well, respectively, from which the liquid is pumped into the oil-bearing strata II under a certain pressure set by telemetry units 28 and III wells. At the same time, the injection of fluid into the oil-bearing strata of wells II and III is carried out under the control of the telemetry unit 8 of the electric drive 13, which responds to the liquid level in the overpacker space 5 communicating with the flooded formation I. According to the reaction of the telemetry unit 8, the latter, if necessary, turns off or turns on the power supply the electric drive 13 and transmits a signal through the power cable 15 to the SU (Fig. 3).

The use of the proposed installations for pumping fluid from the upper layer to the lower layers of the well will significantly increase the efficiency of the operation of wells in oil fields in accordance with the requirements of the Rules for the Protection of the Subsoil, approved by Resolution No. 71 of the Gosgortekhnadzor of the Russian Federation of June 06, 2003

Claims (3)

1. Installation for pumping fluid from the upper to the lower layers of the well, containing a string of elevator pipes, a packer that separates the interstratal space of the well, and a centrifugal pump communicating with the inlet with the above-packer space, and the outlet with the sub-packer, including a receiving module and an electric drive with hermetic cable entry power supply connected to the control station, while the pump outlet is hermetically connected by a telescopic docking unit to the packer barrel with the possibility of separate descent into the casing zhiny and lifting column of tubing sealingly passed through the wellhead flange with cable gland, characterized in that the drive is provided with a block of telemetry, which centrifugal pump is connected with a column of tubing at the well watered formation, and the packer is provided with two anchor devices oppositely directed action. 2. Installation for pumping fluid from the upper to the lower layers of the well, containing a string of elevator pipes, a packer, uncoupling the interstratal space of the well, a centrifugal pump communicating with the inlet with the above-packer space, and the outlet with the sub-packer, including a receiving module and an electric drive with a hermetic input of the power cable connected to the control station, while the pump outlet is hermetically connected by a telescopic docking unit to the packer barrel with the possibility of separate descent into the casing of the well and lifting the column of elevator pipes hermetically passed through the wellhead flange with a cable entry, characterized in that the electric drive is equipped with a telemetry unit, by which the centrifugal pump is connected to the column of elevator pipes at the level of the flooded wellbore, and the packer installed between the oil reservoirs is made with a support the anchor device, and between the upper oil and flooded layers, the packer is made with a locking anchor device, while the elevator pipes at the level of the oil reservoirs are connected through downhole chambers, on the inner side of the wall of which an annular recess is made, at the level of the latter, radial flow holes are made in the wall, overlapped by a replaceable cylindrical insert with throttle holes in the wall communicating with the annular recess, dispensing fluid flows from the cavity of the lift pipes to the oil reservoirs through the interpacker and sub-packer well space, for which a sludge collector is installed on the free end of the bottomhole chamber, blocking the flow channel of the cylindrical insert. 3. Installation for pumping fluid from the upper to the lower strata of the well, containing a column of lift pipes, a packer that separates the interstratal space of the well, and a centrifugal pump communicating with the inlet with the above-packer space, and the outlet with a sub-packer, including a receiving module and an electric drive with hermetic cable entry power supply connected to the control station, while the pump outlet is hermetically connected by a telescopic docking unit to the packer barrel with the possibility of separate descent into the casing life and lifting the column of elevator pipes hermetically passed through the wellhead flange with a cable entry, characterized in that the electric drive is equipped with a telemetry unit, which the centrifugal pump is connected to the column of elevator pipes at the level of the flooded wellbore, and the packer installed between the oil reservoirs is made with a support the anchor device, and between the upper oil and flooded layers, the packer is made with a locking anchor device, while the elevator pipes at the level of the oil reservoirs are connected flowwise and downhole borehole cameras, on the inner side of the wall of which an annular recess is made, at the level of the latter, radial flow openings are made in the wall, which are blocked by a housing of a hydraulic throttle installed in the borehole chambers and communicating with output channels with an annular recess, while the hydraulic chokes are equipped with a telemechanical system unit with the possibility of automatic control, connected by an electric communication cable to each other and to the telemetry unit of the electric drive or manual control power cable from the control panel, functionally connected with the well control station, and the body of the hydraulic choke of the flow chamber is made with an eccentric longitudinal channel communicating the cavity of the lift pipes with the possibility of regulating the volume of fluid injection from the flooded reservoir into the oil reservoir of the well, and the telescopic docking unit is provided electrical connector of the communication cable, providing separate descent of the centrifugal pump and packers with cameras into the casing of the wells and the separate rise of their column of elevator pipes.

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