RU2464413C1 - Borehole pump unit for simultaneous operation of two beds with gas bypass from under parker space (versions) - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: proposed pump unit comprises tube string, parker, string separator, cable, downhole motor, rod string, bypass, check and drain valve, and two separate bed product transfer pumps. Note here that bottom bed product transfer downhole pump is encased while top bed product transfer pump represents a rod-type pump. Bypass valves are arranged above and below perforation intervals in operation string. Separator, tight case accommodating downhole motor and electrically driven rotary pump furnished with cable seal and bypass are arranged above the parker. Separator, check and drain valves and eccentric bush are arranged above said tight case. Said eccentric bush is connected via branch pipe with blind adapter, bypass valve above which rod pump is arranged. Product mixer is arranged above rod pump. Note here that eccentric bush and mixer are communicated via bypass line.

EFFECT: separate transfer of beds product and gas bypass from under-parker space.

2 cl, 2 dwg

Description

The invention relates to the oil industry, in particular to downhole pumping units for oil production. Provides the ability to transport the products of each formation to the surface using separate pumps, as well as bypassing gas from the sub-packer space released from the lower formation during oil production. Gas is removed through a special device - a bypass valve installed in the packer (according to the first option), separating the products of the upper and lower layers, or in a sealed casing of the installation of an electric centrifugal pump (according to the second option). The products of the lower layer are selected by an electric centrifugal pump and discharged through an eccentric coupling bypass line to the product mixing unit, and the formation fluid of the upper layer is taken by a sucker rod pump, which can be either a plug-in pump or a pipe pump, and is also supplied to the mixing unit, from where it is pumped compressor pipes to the surface.

Known pumping unit for simultaneous and separate operation of two layers in the well (US Pat. RF No. 2291953, prior. 13.05.2005, publ. 10.01.2007). The installation comprises a column of elevator pipes, a cable, a packer, a liner and two separate pumps for pumping out the formation products, which are enclosed in the upper and lower casings, the pump for pumping out the products of the lower layer being made electric submersible. According to the invention, the lower casing of the electric submersible pump is equipped 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 in the well is reached. 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 intake of this pump via the side channel is communicated with the over-packer space.

The layout of underground equipment is known (Pat. RF No. 2385409, prior. May 13, 2008), consisting of a pipe string equipped with at least one packer for disconnecting objects with or without a disconnector-connector, an electric drive pump without or with a casing equipped with an input module, a power cable, a submersible electric motor without or with a submersible telemetry unit, a shank and at least one controlled electric valve with a shut-off element.

Known pumping unit (US Pat. RF No. 2405925, prior. 08/24/2009, publ. 10.12.2010). A downhole pump installation for simultaneous separate operation of two layers contains a column of elevator 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 pump connected to the under-packer space, pumps for pumping products, electric submersible with an electric motor 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 that communicates 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.

Closest to the proposed invention (prototypes) is:

1) a borehole pumping unit for simultaneous and separate operation, containing a packer, casing, submersible motor, pressure sensor, inlet assembly, centrifugal pump, sucker-rod pump and manifold (Engineering Practice No. 1/2010, p. 30; http://glavteh.ru/files/InPraktika120104Gabdulov.pdf) :,

2) a borehole pump installation for simultaneous and separate operation, comprising a sucker-rod pump, a borehole fluid mixer, a cable entry packer, an electric centrifugal pump, a drain device and a check valve (Engineering Practice No. 1/2010, p. 44, 45; http://glavteh.ru/files/InPraktika120106Atnabaev.pdf).

The disadvantage of the above downhole pumping units is the following. When installing the packer in downhole installations, there is a danger of accumulation of a critical amount of gas in the under-packer space. Free gas released in the well from the reservoir fluid accumulates in the annulus of the under-packer interval, which has a detrimental effect on the operation of pumping equipment, often leading to a disruption in supply.

The problem solved by the present invention is to increase the efficiency of oil production from two reservoirs by one well in a multilayer field with bypass gas released from the lower reservoir during the production of fluid that accumulates in the sub-packer zone and negatively affects the operation of pumping equipment.

This problem is solved due to the fact that the downhole pumping unit for simultaneous and separate operation of two layers (according to the first embodiment) contains bypass valves installed on the tubing, located below and above the holes of the lower perforation interval in the production string, above the packer a disconnecting device, an airtight casing, in which a submersible electric motor and an electric centrifugal pump, equipped with a cable sealing unit and a bypass device, are located, connectors are installed over the hermetic casing a wearable device, a check valve, a drain valve, an eccentric coupling, which is connected by means of a pipe to a blind sub, a bypass valve, above which there is a sucker rod pump, which can be either a pipe or plug-in one, a product mixing unit (USP) above the sucker pump, and the eccentric coupling and the USP are hydraulically connected by the bypass line. A distinctive feature of the installation according to the first embodiment is the assembly of the equipment in a certain sequence to obtain a technical result, as well as the presence of a sealed power casing with a cable sealing unit and a bypass device that can transfer the load to the downstream equipment, and therefore, allows you to install a borehole pump installation containing an electric centrifugal pump with a submersible electric motor, below which it is necessary to install a packer, in one round trip th operation.

A downhole pump installation for simultaneous and separate operation of two layers (according to the second embodiment) contains an electric centrifugal pump with a submersible electric motor, a check and drain valve, a packer equipped with a cable sealing unit and a bypass device, a disconnecting device, an eccentric coupling, which is connected by means of a nozzle to a blind a sub, a bypass valve, above which is located a sucker rod pump, which can be either a pipe or a plug-in one, a mixing unit, above the sucker rod pump induction (USP), where USP eccentric clutch and hydraulically connected with a bypass line. The novelty of this installation is the layout of known equipment and components in a certain sequence to obtain a technical result.

The inventive borehole pumping unit (options) solves the urgent problem of developing a reliable scheme for gas removal from under the packer during simultaneous and separate operation of two layers.

Figure 1 schematically shows a borehole pumping unit for simultaneous and separate operation of two layers (the first option).

Figure 2 schematically shows a borehole pumping unit for simultaneous and separate operation of two layers (second option).

The equipment of the downhole pumping unit (Fig. 1) is installed in the production well 1 on the pipe string 2 with a plug 3 in the following sequence: the lower bypass valve 4 located under the holes of the lower perforation interval (under the lower reservoir 5), the upper bypass valve 6, located above the holes of the lower perforation interval (above the lower reservoir 5), a packer 7, uncoupling the lower reservoir 5 from the upper reservoir 8, a disconnecting device 9, an electric centrifugal axes 10 Submersible motor 11 enclosed in a sealed casing 12 (e.g. CGE discharged NPF "Packer" g.Oktyabrsky). Energy is supplied to the submersible motor 11 via a power cable 13. The casing 12 has a bypass device 14 for bypassing gas and a cable sealing unit 15, and it is also a power unit, i.e. through it, it is possible to transfer the load to the downstream equipment, for example, for installing the packer 7. Above the casing 12, a disconnector of the column 16, a return 17, a drain 18 valves, over which an eccentric coupling 19 in the form of a tee is located, is installed. The eccentric coupling 19 in the lower part is connected by a pipe with a drain valve 18, in the upper part - with a blind sub 20 and bypass line 21, this can be a tubing (for example, tubing ⌀ 48 mm). Above the blind sub 20, a bypass valve 22 is installed, a sucker-rod pump 23 with a rod string (not shown in FIG. 1), a product mixing unit 24. A bypass line 21 connects the eccentric coupling 19 and the product mixing unit 24. The sucker-rod pump 23 can be implemented as a plug-in and trumpet.

The equipment of the downhole pumping unit (Fig. 2) is installed in the production well 1 on the pipe string 2 in the following sequence: a submersible motor 11 to which energy is supplied from the surface via cable 13, an electric centrifugal pump 10, a check valve 17, a drain valve 18, a packer 25 disconnecting the lower reservoir 5 from the upper reservoir 8 and having a cable sealing assembly 26, and a bypass device 27, a disconnecting device 28. An eccentric coupling 19 is installed above the disconnector of the column 28 e tee. The eccentric coupling 19 in the lower part is connected by a pipe (or tubing string) to a disconnector 28, in the upper part with a blind adapter 20 and bypass line 21, this can be a tubing (for example, tubing ⌀ 48 mm). Above the blind sub 20, a bypass valve 22 is installed, a sucker-rod pump 23 with a rod string (not shown in FIG. 1), a product mixing unit 24. A bypass line 21 connects the eccentric coupling 19 and the product mixing unit 24. The sucker-rod pump 23 can be implemented as a plug-in and trumpet.

Downhole pumping unit for simultaneous separate operation of two layers works as follows.

Depending on the productivity and depth of the beds 5 and 8, pumps 10 and 23 are selected. The installation is collected sequentially according to the scheme (Fig. 1, Fig. 2) and lowered into the well 1.

According to the first embodiment, the installation descends on the pipe string 2 until the bypass valves 4 and 6 are placed below and above the perforation interval of the production string 1 of the lower productive formation 5, and the packer 7 between the layers 5 and 8. The packer 7 is brought into operation in a known manner, thereby disconnecting upper 5 and lower 8 reservoirs. Next, the rod string (not shown in FIG. 1) descends with the plunger of the tube pump 23 or the plug-in pump 23 in a known manner. After that, the mouth is equipped with wellhead fittings (not shown in Fig. 1) with sealing of the cable outlet and the possibility of longitudinal movement of the rod string. The rod string is connected to the drive, and the cable 13 to the submersible motor control station (not shown in FIG. 1).

In the second embodiment, the installation is assembled sequentially according to the scheme (figure 2), while the cable 13 is passed through the sealing unit 26 of the packer 25, followed by isolation in a known manner. The assembly without the plunger of the rod pump 23 or without the pump itself (if the plug-in pump 23 is selected) is lowered on the tubing string 2 until the packer 25 is placed between layers 5 and 8. To install the packer 25 in the string 2, pressure is created, then the unit is unloaded on the packer 25, additionally compressing the rubber elements and jamming the anchor. After packing, the rod string with the plug-in sucker rod pump or the tube pump plunger is lowered. Then the mouth is equipped with wellhead fittings as in the first embodiment.

The cable 13 is supplied with voltage, under the action of which the electric motor 11 is driven, which rotates the rotor of the pump 10, pumping the products of the lower layer. The actuator of the sucker rod pump 23 is driven, lifting the products of the upper layer to the surface.

As a result of the operation of the pump 10, the products of the lower layer 5 enter through the bypass valves 4 and 6 (according to the first embodiment) through the hydraulic channel in the packer 7 and the disconnector 9 into the casing 12 (Fig. 1). In this case, due to natural separation from the borehole fluid of the lower layer, gas is released, which accumulates under the packer, forcing the borehole fluid down. Between the volume of free gas and water in the free phase, the hydrocarbon component of the well fluid accumulates. When the set pressure is reached, the valves open and the borehole fluid and gas through the bypass valves 4 and 6 enter the tubing and through them then to receive the electric centrifugal pump 10. Thus, the gas is bypassed from the annular sub-packer space of the well into the tubing string. Then, through the hydraulic channel through the packer 7, the disconnector 9, the reservoir gas-liquid mixture enters the sealed power casing 12, from where the liquid is taken by the pump 10, and the gas is removed from the upper part of the casing 12 with the bypass device into the annular space. The fluid from the lower reservoir 5, taken by the pump 10 through the bypass line 21 enters the product mixing unit 24. The reservoir fluid from the upper reservoir 8 through the bypass valve 22 is received by the sucker rod pump 23 into the product mixing unit 24, where it is mixed with the products of the lower formation and rises to the surface along the string of pipes 2. If it is necessary to change the pumps, it is possible to disconnect the borehole pumping unit using a disconnecting device 9 without removing the packer 7 and lower installed equipment (bypass valves 4, 6, plug 3).

During the operation of the downhole pumping unit (according to the second embodiment), gas accumulating under the packer 25 is discharged by the bypass device 27 into the annular annular space. The products of the lower reservoir are pumped out by the electric centrifugal pump 10 and through the hydraulic sealed channel through the return 17, drain 18 valves, packer 25, disconnector 28, the eccentric coupling 19, the bypass line 21 enters the mixing unit of the product 24. The products of the upper reservoir 8 through the bypass valve 22 selected by a rod pump 23 and also enters the site 24, where, mixing with the products of the lower reservoir 5, it enters the surface of the tubing string 2.

The proposed design of a downhole pumping unit (options) provides the possibility of bypassing gas released from the lower reservoir during the production of fluid that accumulates in the sub-packer zone and negatively affects the operation of pumping equipment, thereby increasing the efficiency of oil production from two reservoirs by one well in a multi-reservoir field.

Claims (2)

1. A downhole pumping unit for simultaneous and separate operation of two layers in a well, comprising a pipe string, a packer, a pipe disconnector, a cable, a submersible motor, a rod string, bypass, check and drain valves and two separate pumps for pumping out the formation, and a pump for pumping out the products of the lower layer is electrically submersible with a casing, and the upper pump for pumping the products of the upper layer with a rod, characterized in that lower and higher holes of the lower interval of perforation in operational the by-pass valve is installed on the column; then, to disconnect the lower reservoir from the upper packer, a disconnecting device, a sealed casing, in which a submersible electric motor and an electric centrifugal pump equipped with a cable sealing unit and a bypass device are located, are installed above the packer; drain valves, eccentric coupling, which is connected by means of a branch pipe to a blind sub, bypass valve, above which is located Xia rod pump, which may be a tube and the insert, on a sucker rod pump assembly mixing products (USP), where USP eccentric clutch and hydraulically connected with a bypass line. 2. A downhole pumping unit for simultaneous and separate operation of two layers in a well, comprising a pipe string, a packer with cable entry, a disconnector, a cable, a submersible motor, a rod string, bypass, check and drain valves and two separate pumps for pumping formation products, the pump for pumping the products of the lower layer is electrically submersible, and the upper pump for pumping the products of the upper layer with a rod, characterized in that a return and drain valve are installed above the electric centrifugal pump pans, for separation of the lower reservoir from the upper one, a packer equipped with a cable sealing unit and a bypass device; above the packer, a disconnecting device, an eccentric coupling, which is connected by means of a pipe to a blind sub, a bypass valve, above which there is a rod pump, which can be either pipe mixing and plug-in, above the rod pump product mixing unit (USP), and the eccentric coupling and USP are hydraulically connected by the bypass line.

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