RU2515630C1 - Method of simultaneous separate operation of multiple-zone well by two submersible pumps and equipment for its implementation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method includes placement of a pump unit in the well containing a pipe string, a rod string, two packers, two pumps at that the upper pump is a sucker-rod pump and the lower pump is a submersible one with an electric motor and a cable; start-up of the well and its operation. At that the lower by-pass valves, the lower packer and a safety unit are connected, a telescopic joint without a hollow flexible rod is fixed to the pipe string, then the upper by-pass valves are connected to the installation, then the hollow flexible rod is run-in into the telescopic joint and pipes of less diameter are screwed into it. The pipes are fitted and the string of pipes with less diameter is connected with a cross-over coupling or crossover shoe installed in the perforated pipe; the upper packer is connected; on-off tool is mounted; the installation assembled at the pipe string is run in into the set interval until packers are transferred into an operating position; disconnection is made in the on-off tool and the pipe string is run out. Then the recoverable part of the on-off tool, the submersible pump inside the housing and a set of a by-pass line are run in into the well at the pipe string; the remaining and recoverable parts of the on-off tool are matched and the sucker-rod pump is run in.

EFFECT: increased efficiency of well operation.

10 cl, 5 dwg

Description

The invention relates to the oil and gas industry and can be used for simultaneous and separate production of hydrocarbons from two layers through one well.

Known pumping unit for the simultaneous separate operation of two layers in the well, including a column of elevator pipes, cable, a packer installed between the layers, a shank, an upper sucker rod and lower electric submersible pumps for pumping the products of the corresponding layers. The upper and lower pumps are respectively enclosed in an upper casing, top connected to the column of elevator pipes and provided with a side channel, and a lower casing with a cable sealing unit, communicated with the under-packer space through the shank. The output of the electric submersible pump is communicated with the upper casing, and the intake of the sucker rod pump via the side channel is communicated with the over-packer space. The upper casing is equipped with an internal vertical hollow technological sleeve communicated from below with a side channel, which is equipped with a check valve. The sucker rod pump is made plug-in with the lower cuff anchor, made with the possibility of a tight fit in the technological sleeve during the interaction, ensuring the input of the sucker rod pump with this sleeve. The entrance of the side channel is made inclined downward at an angle of 15-60 ° to the axis of the upper casing (RF patent No. 76969, publ. 10.10.2008).

A known pump installation for simultaneous and separate operation of two layers in the well (options), according to one embodiment, the installation contains a column of elevator pipes, a cable, a packer, a liner and two pumps, the upper of which is made by a rod and the lower one is electric submersible with an electric motor, cable and casing. According to the invention, when it is admissible to mix formation products, it is equipped with a cable sealing unit, which is located in the input module of the electric submersible pump. In addition, the installation has a channel with a check valve for connecting the output of the electric submersible pump with a column of elevator pipes and a channel for receiving and pumping products with a sucker rod pump from the upper layer through the annulus to the column of elevator pipes. The casing is made covering only the electric motor and communicates with the under-packer space through the shank. At the same time, it is possible for the lower layer products to enter through this shank, casing and channel with a check valve into the lift pipe string. In another embodiment, when mixing the formation products is inadmissible, the rods of the upper pump are hollow (RF patent No. 2339798, publ. November 27, 2008).

A well-known pumping unit for simultaneous separate operation of two layers, comprising a column of lift pipes, a cable, a packer installed between the layers, a transfer device, an upper enclosed in a casing, a plunger with a column of rods and a lower communicating with the under-packer space, is electric submersible with an electric motor , pumps for pumping the products of the corresponding layers, cable sealing assembly. The output of the electric submersible pump is communicated by a pipe with an upper casing, which is connected from above to the column of elevator pipes and is equipped with a side channel communicating the inlet of the upper pump with an over-packer space. The pipe, which communicates the output of the lower pump with a column of elevator pipes, is equipped with an additional non-return valve. The plunger pump is made plug-in with the possibility of tight interaction with the inner surface of the technological pipe of the upper casing. Packer landing pressure is lower than that set for check valves for adjustable valves (RF patent No. 2405925, publ. 10.12.2010).

A known installation containing a column of elevator pipes, a cable, a packer, a liner and two separate pumps for pumping formation products, which are enclosed in the upper and lower casings, and the pump for pumping the production of the lower layer is made submersible. According to the invention, the lower casing of the electric submersible pump is provided with a cable sealing unit and is communicated from below with a sub-packer space through a shank. The liner above the packer is equipped with a bypass device that is able to provide hydraulic communication between the above-packer space of the well and its under-packer space through the liner when the pressure of operation of the bypass device is reached in the well. The output of the electric submersible pump is in communication with the upper casing. This casing is connected to the column of elevator pipes from above and is provided with a side channel. In this case, the upper pump is a rod pump, the rod string of which is hollow and hermetically connected to the plunger of the rod pump. The reception of this pump through the side channel is communicated with the over-packer space (RF patent No. 2291953, publ. 20.01.2007).

Known pumping unit for the simultaneous separate operation of two layers in the well, containing a column of elevator pipes, cable, packer, bypass device, two pumps, the lower of which is electric submersible, and the upper one is enclosed in a casing. The packer is equipped with a cable sealing unit and a detachable sleeve, the lower pump is located in the under-packer space, while the output of the lower pump is connected through the packer to the casing of the upper pump by an inter-pump pipe string, on which a bypass device is placed below the packer (RF patent No. 2427705, published on 08.27.2011 g.).

A disadvantage of the known installations is the inability to operate the upper layer with an electric submersible pump, and the lower layer with a plunger pump if the upper layer is highly productive and the lower layer is low productivity.

Known equipment for simultaneous and separate oil production from two reservoirs through one well, in which the lower reservoir is low productivity, and the upper reservoir has a higher productivity. The lower layer is operated by a rod pump, and the upper layer is operated by an electric centrifugal pump. To separate the strata in the wellbore, the equipment contains a packer with a head with which the suction pipe of the pumping unit, including the electric centrifugal and sucker-rod plunger pumps, is hermetically connected. The fluid from the lower reservoir along the packer barrel and its head through the bypass tube enters the shank of the sucker rod pump. The electric centrifugal pump is located below the sucker rod pump, in the fluid flow coming from the upper layer and cooling its engine (RF patent No. 109792, publ. 10.27.2011).

A disadvantage of the known installation is the complexity of the bypass line along the ESP and the inability to use serial ESP in the 146th production casing.

A known pump installation for simultaneous and separate operation of two layers in a well, selected as a prototype, comprising a column of elevator pipes, a column of rods or a column of hollow rods, a main packer, a liner with a main channel, the input of which is connected to the under-packer space, and two pumps, the upper of which is made rod-shaped, and the lower one is electric submersible. The inlet of the plunger pump is in communication with the over-packer space. The electric submersible pump is equipped with an electric motor, a cable and a casing, covering only the electric motor and equipped with a cable sealing unit, which is located in the input module of the pump. The casing is connected to the shank. For separate lifting of formation products, the output of the electric submersible pump is communicated with a column of elevator pipes, and the plunger one with hollow rods. An additional packer is installed above the upper layer. The shank is equipped with an additional channel communicating the input of the electric submersible pump with interpacker space, and the output of the main channel is communicated with the superpacker space (RF patent No. 2405923, published on December 10, 2010).

    A disadvantage of the known installation is the occurrence of a compressive load on the ESP during operation, as well as the inability to prevent mudding of the bottomhole zone during ongoing well repair or flushing of downhole pumping equipment and the risk of absorption of fluid from one formation by another formation.

    The technical result of the invention is to increase the efficiency of the operation of the well, maintaining a separate metering fluid, the use for operation of a plug-in or tubular sucker rod pump or screw pump. Also, ensuring the most complete development of oil reserves from the near-wellbore zone of the formation, eliminating the influence of killing or flushing fluid on the bottom-hole zone of the formation during routine well repair, and achieving the hydrophobization effect. In addition, removing pumps for inspection without lifting the packer-valve equipment.

The technical result is achieved by the fact that:

- in the installation for simultaneous and separate operation of a multilayer well, a safety assembly, a telescopic connection are installed above the lower packer, a column disconnector is installed above the upper packer, while there are pipes of smaller diameter between the lower and upper packers, the lower end of which is connected to the hollow movable rod of the telescopic connection, and the upper end is connected to a cross-section sub, wherein pipes of smaller diameter are passed inside the central channel of the upper bypass valves;

- a cross-section sleeve or perforated pipe in which a sub is placed is installed above the upper packer;

- the pump installed inside the bypass line kit can be made screw;

- the unit is equipped with upper and lower anchors located respectively above and below the bypass line kit;

- connect the lower bypass valves, the lower packer, the safety assembly, attach the telescopic connection without a hollow movable rod to the pipe string, then attach the upper bypass valves to the installation, then lower the hollow movable rod into the telescopic connection into which pipes of smaller diameter are screwed, while fitting pipes and connecting a string of pipes of a smaller diameter with a cross-section sleeve or with a sub installed in a perforated pipe, attach the upper packer, mount once the unit of the column, carry out the descent of the assembled installation on the pipe string to a predetermined interval and transfer the packers to the working position, disconnect the pipe in the disconnector and raise the pipe string, then the extracted part of the pipe disconnector, the electric submersible pump located inside the casing are lowered into the well on the pipe string, a set of bypass lines, dock the left and retrievable parts of the column disconnector, carry out the descent of the sucker rod pump;

- the installation of an electric submersible pump is placed in a casing;

- the bottom of the pipe string is performed with a plug;

- a set of bypass lines, consisting of upper and lower blocks, between which two parallel lines of equipment are installed, one of which includes a sub connected in series, a rod pump casing, a filter, an adapter on which a cone is installed, which is included in the corresponding undercut of the lower block, another line of equipment includes a polished rod and a pipe connected to each other, while the upper and the other are attached to the upper part of the upper block and to the lower part of the lower block the lower branch pipes, and on the outer surface of the upper and lower blocks, parallel to their axis, longitudinal grooves are made for laying the cable;

- a coupling is attached to the upper nozzle;

- the movable joint of the polished rod with the upper block is sealed with cuffs and rings, pressed down from the bottom by a cover fixed by bolts.

    The presence of a bypass line kit allows you to combine the installation of electric centrifugal and sucker-rod pumps in the installation of underground downhole equipment for the purpose of simultaneous and separate operation of several layers, while increasing the efficiency of the pumping operation of the well, as well as the separate accounting of fluid produced from two layers.

    The design of the bypass line kit allows you to place a plug-in or tube sucker rod pump or screw pump in it, to filter the liquid entering the pump intake.

    The presence of a safety node makes it possible to release the packer in case of complications associated with the powdering of its head, and also increases the safety of repair and emergency operations.

    The presence of a cross-section coupling or a perforated pipe installed above the upper packer, inside of which a sub is placed, allows fluid bypass from pipes of a smaller diameter to the annular annular space.

    The scheme of a two-packer installation for simultaneous and separate operation of a multilayer well is shown in Fig. 1. The scheme of a single-packer installation for simultaneous and separate operation of a multilayer well, equipped with a rod deep pump and an electric submersible pump, is shown in figure 2. The scheme of a single-packer installation for simultaneous and separate operation of a multilayer well equipped with a screw pump and an electric submersible pump is shown in Fig. 3. A set of bypass lines is presented in figure 4. Section AA of the bypass line set is shown in FIG. 5.

A two-packer installation for simultaneous and separate operation of a multilayer well 1 (Fig. 1) includes equipment installed on a pipe string 2 with a plug 3 in the following sequence: lower bypass valve 4 located under the openings of the lower perforation interval (under the lower reservoir) 5, lower a bypass valve 6 located above the holes of the lower perforation interval (above the lower reservoir) 5, the lower packer 7, disconnecting the lower reservoir 5 from the upper reservoir 8, node safety 9, telescopic connection 10. Above the telescopic connection 10 there is an upper bypass valve 11 located under the openings of the upper perforation interval (upper productive formation) 8, an upper bypass valve 12 located above the openings of the upper perforation interval (upper productive formation) 8, upper packer 13. Between the lower 7 and upper 13 packers there are pipes of a smaller diameter 14, passed through the central channel of the upper bypass valves 11, 12. The lower end of the pipes of a smaller diameter 14 with oedinen to the hollow rod 15, movable telescopic coupling 10 and an upper end connected to the coupling cross-section 16. Instead of the coupling cross-section 16 can use a perforated pipe, with installed within it sub (1 not shown). The cross section coupling 16 and the perforated pipe with a sub (not shown in FIG. 1) are used to transfer fluid from pipes of smaller diameter 14 to the annular annular space 17.

Above the upper packer 13 is a disconnector of the column 18, consisting of left and removable parts (not shown in FIG. 1), which serves to lower and install the packer-valve equipment on the pipe string, as well as to connect the upper packer 13 with the installation of an electric submersible pump 19, placed in a protective casing 20. Above the installation of the electric submersible pump 19 is a set of bypass lines 21. Inside the set of bypass lines 21 there is a sucker rod pump 22 with a rod string 23.

    The one-packer installation for simultaneous and separate operation of the multilayer well 1 (Fig. 2, Fig. 3) includes equipment installed on the pipe string 2 in the following sequence: installation of an electric submersible pump 19 located above the lower reservoir 5, a packer with cable entry 24, uncoupling the lower reservoir 5 from the upper reservoir 8, and the set of bypass line 21. Inside the set of bypass line 21 there is a sucker rod pump 22 (Fig. 2) with a rod string 23. In a single-pack installation for single belt-separate operation of a multilayer well 1 also, instead of a sucker rod pump 22, a screw pump 25 can be used (Fig. 3). To fix the pipe string 2, the installation is equipped with upper and lower anchors 26, 27 (Fig. 3) located above and below the bypass line set 21. In this case, the anchors 26, 27 can be made with grooves for cable laying (not shown in Fig. 3 ) In addition, a single-pack installation can be equipped with a check valve 28 (Fig. 3) located above the installation of an electric submersible pump 19.

    A set of bypass lines (figure 4) contains the upper 29 and lower 30 blocks, between which two parallel lines of equipment are installed. One of the lines includes a sub 31 connected in series with each other, a rod pump casing 32, a filter 33, an adapter 34, on which a cone 35 is installed, which is included in the corresponding recess of the lower block 30. Another equipment line includes a polished rod 36 connected to each other and the pipe 37. The movable connection of the polished rod 36 with the upper block 29 is sealed by cuffs and rings 38, pressed down from the bottom by a cover 39 (Fig. 5), fixed by bolts 40. To the upper part of the upper block 29 (Fig. 4) and to the lower part of the lower block 30 at replays respectively upper 41 and lower 42 tubes. A coupling 43 is connected to the upper pipe 41. On the outer surface of the upper 29 and lower 30 blocks, parallel to their axis, longitudinal grooves 44 (Fig. 5) are made for laying the cable 45. The power cable 45 (Fig. 5) of the submersible motor passes through the grooves 44 upper 29 and lower 30 blocks, which are the closest to the cable line when assembling the unit.

    The implementation of the method is described in the description of the equipment.

    Equipment two-packer installation is collected in the sequence indicated in figure 1. The entire assembly is designed so that the lower reservoir 5 is between the bypass valve 4 and the bypass valve 6, and the upper reservoir 8 is between the bypass valve 11 and the bypass valve 12. Connect the lower bypass valves 4, 6, the lower packer 7, install the site safety 9, attach the telescopic connection 10 to the pipe string 2 without its hollow movable rod 15. Then, the upper bypass valves 11, 12 are connected to the installation.

    Next, a movable rod 15 is lowered into the telescopic connection 10, into which pipes of a smaller diameter 14 are screwed. In this case, pipes are adjusted in a known manner and a pipe string of smaller diameter 14 is connected to a cross-section sleeve 16 or to a sub mounted in a perforated pipe (in Fig. 1 not shown). With fluctuations in the pipe string of smaller diameter 14 in the pipe string 2, the hollow movable rod 15 moves relative to the body of the telescopic joint 10 and compensates for the axial movements of the columns relative to each other, while the hydraulic isolation of the productive formations 5, 8 is not disturbed. Then, the upper packer 13 is connected and the disconnector is mounted columns 18. Next, the assembled installation is lowered on the pipe string 2 to a predetermined interval and the packers 7, 13 are put into working position. After carry out the disconnection in the disconnector of the column 18 and the rise of the pipe string 2.

    Then, the extractable part of the column disconnector 18, the installation of the electric submersible pump 19 located inside the casing 20, and the set of the bypass line 21 are lowered into the well on the pipe string 2, and the extracted and left parts of the pipe disconnector 18. Dip on the column rods 23 rod pump 22, if the plug-in pump is used or if a tube pump is already installed in the bypass line 21 installed in the bypass line kit, the plunger (not shown in FIG. 1) of the rod pump is lowered. They start the well in the required mode and begin operation. After starting the installation, the products of the lower layer 5, passing through the lower bypass valves 4, 6 into pipes of smaller diameter 14, flows into the space 17 above the upper packer 13, after which it passes through the filter 28 to the intake pump 22 and is pumped to the surface. The products of the upper layer 8, passing through the upper bypass valves 11, 12 into the pipe string 2, then into the casing 20 of the electric submersible pump 19 and the bypass system 21, rises to the surface.

    The equipment of a single packer unit is assembled in the sequence indicated in FIG. The installation of the electric submersible pump 19, the packer with the cable entry 24, the bypass line set 21 is connected. If necessary, the installation is equipped with a check valve 28 (Fig. 3) located above the installation of the electric submersible pump 19. The packer with the cable entry 24 is put into operation. A sucker-rod pump 22 is lowered on a rod string 23, if a plug-in pump is used or a tube pump is already installed in the bypass line kit 21, a plunger (not shown in FIG. 2) of the sucker rod pump is lowered on the boom string 23. If necessary, the installation is equipped with upper 26 and lower 27 anchors located above and below the set of bypass line 21. Start the well in the desired mode and begin operation. After starting the installation, the products of the lower layer 5, arriving at the reception of the electric submersible pump 19, flows along the pipe string 2 into the polished rod 36 and the pipe 37 of the bypass line kit 21 and rises to the surface. The products of the upper layer 8 enter through the filter 33 to the intake of the sucker rod pump 22 and are pumped to the surface.

    The claimed invention allows to increase the efficiency of well operation, to keep a separate record of the fluid, to use a plug-in or tube sucker rod pump or a screw pump for operation, also to ensure the most complete production of oil reserves from the near-well zone of the formation, to exclude the influence of kill fluid or flushing on the bottom-hole zone of the formation when maintenance work, to achieve the effect of hydrophobization, in addition, remove the pumps for inspection without lifting the packer-valve equipment.

Claims (10)

1. Installation for simultaneous and separate operation of a multilayer well containing a pipe string, a rod string, one or two packers, bypass valves, two pumps, the upper of which is made by a rod, and the lower one is electric submersible with an electric motor and cable, which is also equipped with a bypass line kit, located above the installation of the electric submersible pump, and the sucker rod pump is installed inside the bypass line kit, characterized in that a safety assembly is installed above the lower packer, a telescopic connection moreover, a column disconnector is installed above the upper packer, while between the lower and upper packers there are pipes of smaller diameter, the lower end of which is connected to the hollow movable rod of the telescopic connection, and the upper end is connected to the cross-section sub, and pipes of smaller diameter are passed inside the central channel of the upper bypass valves. 2. Installation according to claim 1, characterized in that a cross-section sleeve or perforated pipe in which the sub is placed is installed above the upper packer. 3. Installation according to claim 1, characterized in that the pump installed inside the bypass line kit is made screw. 4. Installation according to claim 1, characterized in that it is equipped with upper and lower anchors located respectively above and below the bypass line kit. 5. The method of simultaneous and separate operation of a multilayer well with two submersible pumps, including placing a pumping unit in the well containing a pipe string, a rod string, two packers, two pumps, the upper of which is made by a rod, and the lower one is electric submersible with an electric motor and cable; the desired mode and its operation, characterized in that they connect the lower bypass valves, the lower packer, the safety assembly, attach the telescopic connection without a hollow movable rod to the pipe string, the upper bypass valves are connected to the installation, then a hollow movable rod is lowered into the telescopic connection, into which pipes of a smaller diameter are screwed, while the pipes are fitted and the pipe string of smaller diameters is connected to a cross-section coupling or to an adapter installed in a perforated pipe, the upper packer, mount the disconnector of the column, carry out the descent of the assembled installation on the pipe string to a predetermined interval and transfer the packers to the working position, disconnect in the column disconnector and raising the pipe string, then the extracted part of the column disconnector, the electric submersible pump located inside the casing, and the bypass line set are docked into the well on the pipe string, the left and removed parts of the column disconnector are docked, the rod pump is lowered. 6. The method according to claim 5, characterized in that the installation of an electric submersible pump is placed in a casing. 7. The method according to claim 5, characterized in that the bottom of the pipe string is performed with a plug. 8. A bypass line set consisting of upper and lower blocks, between which two parallel lines of equipment are installed, one of which includes a sub connected in series, a rod pump casing, a filter, an adapter, on which a cone is installed, which is included in the corresponding recess of the lower block, another line of equipment includes a polished rod and a pipe connected to each other, while the upper and the lower are attached to the upper part of the upper block and to the lower part of the lower block izhny tubes, and on the outer surface of the upper and lower blocks parallel to their axes, there are longitudinal grooves for laying the cable. 9. The bypass line set of claim 8, characterized in that the coupling is connected to the upper pipe. 10. The bypass line set of claim 8, characterized in that the movable connection of the polished rod to the upper block is sealed with cuffs and rings, pressed down from the bottom by a cover fixed by bolts.

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