RU2630835C1 - Plant for simultaneous oil production from two formations - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: plant for simultaneous production of oil from two formations contains a screw pump running into a well on tubing, a packer. In this case, a screw sucker-rod pump, which rotor is connected to the upper frequency-controlled drive, is located above the upper formation, and the second frequency-controlled electric screw pump is located above the lower formation. The supporting unit of the electric screw pump is connected by flexible shaft with a pump rotor connected to a valve motor equipped with a telemetry unit with pressure, temperature and vibration sensors. The packer is installed between the electric screw pump and the upper formation. The plant is additionally equipped with passive gas separator installed under the sucker-rod screw pump with an input module and above the output module of the electric screw pump. The input module of the rod screw pump and the output module of the lower electric screw pump have longitudinal slots for introducing oil and gas containing liquid from the lower horizon into the above-packer zone.

EFFECT: expansion of operational capabilities.

2 cl, 1 dwg

Description

A unit for the simultaneous production of oil from two formations refers to oil production and can be used for the production of liquid hydrocarbons both in pure form and water-cut to 99.9% with the content of hydrogen sulfide, sand, proppant, asphaltenes, paraffin and related products for oil production from wells with viscosities up to 10,000 mPas.

From the prior art it is known "Equipment for simultaneous and separate oil production from two layers" according to patent RU109792 from 06/29/2011, published on 10/27/2011, IPC E21B43 / 14. Well equipment for simultaneous and separate oil production from two layers separated in the wellbore a packer, the head of which is hermetically connected to the suction pipe of the pumping unit, including an electric centrifugal and sucker-rod plunger pumps, while the plunger intake is equipped with a pipe shank, which through a bypass pipe located in parallel no electrical submersible pump and motor, the suction line of the pump unit, the packer bore well head and fluidically connected to the lower reservoir, and the electric centrifugal pump is in fluid flow entering from the upper reservoir.

But this device does not allow to adjust the performance of the electric centrifugal pump without losing the pressure characteristics of the pump. Also, this installation as a whole is not capable of producing oil and gas with a high content of mechanical impurities and viscous and high viscosity oils due to the design characteristics of a centrifugal pump. Highly paraffin and viscous oils clog the working cavities of the pump, as a result of which the unit is jammed.

The well-known "Installation for simultaneous-separate development of two production facilities by one well" according to patent RU115408 dated 12/05/2011, published on 04/27/2012, IPC E21B43 / 14, including a means for isolating production facilities from each other, a first channel hydraulically connected to the first the reservoir, the second channel, hydraulically connected to the second reservoir, while it includes a first shutoff valve, configured to shut off and pass the fluid flow through the first channel and change its state when exposed to and the first control signal, and the second shut-off valve, configured to shut off and pass the fluid flow through the second channel and change its state when a second control signal is applied to it, while the first and second channels are hydraulically connected to the volume of the casing string, and at least one of the first and second shutoff valves is provided with fixation means; means for isolating production facilities from each other includes a packer system; at least one of the first and second control signals is a hydraulic signal; at least one of the first and second shutoff valves comprises a shutoff valve with a fitting, and the corresponding control signal contains a certain flow rate through the channel; at least one of the first and second shutoff valves contains a saddle-ball pair, and the corresponding control signal is a specific value of the pressure of the liquid column in the annulus; the unit is equipped with a differential pressure controller.

But this device does not allow the production of oil and gas with a high content of mechanical impurities and viscous and highly viscous oils. The installation is equipped with several shutoff valves, which, when operating this installation on viscous and highly viscous oils, can lead to sticking of the valves, and auxiliary channels are not able to pass a sufficient amount of viscous fluid, which limits this device in terms of productivity.

The closest technical solution in technical essence is the device according to patent RU2477367 "Method for simultaneous and separate operation and injection of two layers in one well and a device for its implementation" dated 09/07/2011, published on 03/10/2013, IPC E21B43 / 14 A device for implementing the method simultaneously separate operation and injection of two layers with one well, consisting of a screw submersible unit lowered into the well at the tubing and a screw pump driven by a hydraulic screw motor atelier, axial support and channels for the passage of power and produced fluids, while on the body of the submersible unit there are two packers, one of which is located above the perforation zone of the upper layer, and the second is above the perforation zone of the lower layer, as well as the fact that all parts are rotary groups of the submersible unit have a through longitudinal channel connecting the internal cavity of the tubing with perforations in the lower layer; the axial support is placed in an autonomous spindle unit, the hollow shaft of which is connected to the pump rotor by means of a hollow flexible connection; the working bodies of the hydraulic motor and pump have identical cross sections with the same kinematic ratio and eccentricity; the pump rotor is stamped with a non-circular shaped hole.

But this device does not allow the production of oil and gas with a high content of mechanical impurities and viscous and highly viscous oils due to the fact that this type of equipment belongs to volumetric systems, and when the rotor rotates in the stator, free cavities are replaced where vacuum occurs.

The objective of the proposed technical solution is to expand the operational capabilities of the installation for the development of a field with light, viscous and highly viscous oils, with a content of solids of up to 35% and a water cut of from 0 to 99%, with a content of hydrogen sulfide, sand, propant, asphaltenes, paraffin, and related products from oil production from wells with viscosities of up to 10,000 mPas.

The problem is solved due to the installation for simultaneous oil production from two reservoirs, containing a screw pump, a packer, lowered into the well on tubing, a screw pump, the rotor of which is connected to the upper frequency-controlled drive by rods, located above the upper layer, the second variable-frequency electric screw pump is located above the lower layer, the supporting unit of the electric screw pump is connected by a flexible shaft to the pump rotor connected to the valve motor equipped with telemetry com with pressure, temperature and vibration sensors; a packer is installed between the electric screw pump and the upper layer; the installation is additionally equipped with a passive gas separator installed under the rod screw pump with an input module and above the output module of an electric screw pump; the input module of the sucker-rod screw pump and the output module of the lower electric screw pump have longitudinal slots for introducing oil and gas-containing fluid from the lower horizon into the over-packer zone; the installation is additionally equipped with a control station for a rod-type screw pump with a frequency converter connected to the top drive engine and a station for controlling an electric screw pump with a frequency converter connected by a cable to the electric screw pump motor.

The relative position of all units of the installation in the well, with the location of the rod screw pump, the rotor of which is connected to the upper frequency-controlled drive by the rods, above the upper layer and the location of the second frequency-regulated electric screw pump above the lower layer and their coordinated interaction with separate frequency regulation, when changing the composition of the extracted products in each layer separately from clean to waterlogged to 99.9%, with the content of hydrogen sulfide, sand, proppant, asphaltenes, paraffin and related products, with a viscosity of up to 10,000 mPas, allows you to optimize the total productivity of the installation, which makes it possible to adjust the well productivity to both increase to + 50% and decrease to -40%.

The connection of the support unit of the second electric screw pump with a flexible shaft to the pump rotor and further with a valve motor equipped with a telemetry unit with pressure, temperature and vibration sensors allows full control of all engine performance, such as engine temperature, engine vibration, pump intake pressure, and by lowering or increasing the rotational speed of the electric screw pump, select the optimal mode of fluid withdrawal from the lower reservoir, not exceeding the productivity by wasp, and to determine the moment of start of the upper boom to align the screw pump works both engines - sucker rod screw pump and the electric screw pump.

Installing a passive gas separator under the rod screw pump with an input module and above the output module of the electric screw pump, attaching it to the output module of the lower electric screw pump and supplying the input module of the rod screw pump and the output module of the electric screw pump with longitudinal slots for introducing oil and gas-containing liquid from the lower layer into the overpacker zone allows you to separate the free gas from the products of the lower reservoir, partially free the liquid, e.g. melted directly into the sucker-rod pump, from the gas discharged into the annulus, which allows the unit to be used in the production of both pure oil and water-cut up to 99.9%, containing hydrogen sulfide, sand, proppant, asphaltenes, paraffin and related products with viscosity up to 10,000 mPas.

The technical solution is illustrated by a drawing of a general view of the installation, where a polished rod 1, top drive 2 of a rod screw pump (hereinafter referred to as SHVN), stuffing box of drive 3, preventer 4, faceplate 5, production casing 6 (hereinafter referred to as EC), casing 7 pipes (hereinafter - tubing), a column of 8 rods of the upper ШВН, the rotor 9 of the upper ШВН, the upper ШВН 10 with an input module, a gas separator 11, the upper reservoir being used 12, the coupling 13 with a plug, the output module 14 of the lower electric screw pump (hereinafter - ЭВН ), packer 15, cable line 16 lower EVN, ball check valve 17 (hereinafter referred to as KOSH), rotor 18 of the lower EVN, lower EVN 19, input module 20 of the lower EVN, support assembly 21 of the lower EVN, hydraulic protection 22 of the engine, engine 23 of the lower EVN, lower operating horizon 24, block 25 telemetry, station 26 control ШВН, station 27 control ЭВН.

Installation for the simultaneous production of oil from two layers is performed as follows.

Under the faceplate 5, a tubing string 7 is installed, on which the ШВН 10 is mounted with an input module equipped with longitudinal slots. The rotor 9 ШВН 10 with rods is connected to the upper frequency-controlled drive 2.

The length of the tubing string 7 is selected a certain length necessary to accommodate the ШВН 10 with the input module above the upper layer 12.

To separate free gas into the annulus, the installation is additionally equipped with a passive gas separator 11 installed under the ШВН 10 with the input module and above the output module 14 ЭВН 19. The input module ШВН 10 and the output module 14 of the lower ЭВН 19 have longitudinal slots for introducing oil and gas-containing liquid from the lower horizon into the over-packer zone.

Below is installed the clutch 13 with a plug and provided with slots of the output module 14 of the lower EVN 19.

 For the separation of the two layers 12 and 24 between the ШВН 10 and ЭВН 19, a packer15 is installed.

Below the packer, the tubing string 7 is selected with the length required for sequential placement of the check valve 17 and the second frequency-controlled EVN 19 located above the lower layer 24, the support node of which is connected by a flexible shaft to the rotor 18 of the EVN connected to the valve motor 23 equipped with a telemetry unit 25 with pressure, temperature and vibration sensors.

Under the EVN 19 are located the input module 20 of the lower pump EVN 19, then the support unit 21 of the lower EVN 19, hydraulic protection 22 of the engine 23, the valve motor 23 and the telemetry unit 25.

The installation is additionally equipped with a control station ШВН 26 with a frequency converter connected to the engine of the top drive 2, and an EVN control station 27 with a frequency converter connected by a cable 16 to the ЭВН engine 23.

The installation of a passive gas separator 11 under the ШВН 10 with the input module and above the output module ЭВН 19, its connection to the output module 14 of the lower ЭВН and supplying the input module ШВН 10 and the output module 14 ЭВН with longitudinal slots for introducing oil and gas-containing liquid from the lower layer 24 into the overpacker zone to separate the free gas from the products of the lower reservoir 24, to partially release the liquid sent directly to the ШВН 10 from the gas discharged into the annulus, which allows the use of the installation When the extraction as a pure oil and watered to about 99.9%, with a content of hydrogen sulfide, sand, proppant, asphaltene, paraffin and related products with viscosity 10 000 mPas.

Installation for the simultaneous production of oil from two layers is mounted as follows.

First step. After the sequential placement of the installation units: telemetry unit 25 with sensors, engine 23, hydraulic protection 22 of the engine, support unit 21 of the lower EI, input module 20 of the lower EI, lower EI 19, ball check valve 17 (hereinafter referred to as KOSH), packer 15, column 7 tubing equipped with longitudinal slots of the module 14 lower EVN 19, the coupling 13 with a plug, the gas separator 11 of the upper ШВН 10, the upper ШВН 10, the tubing string 7 with a parallel cable 16, the faceplate 5, turn the tubing string 7 clockwise packer 15 in pa position

Second phase. Mount the rotor 9 of the upper ШВН and lower it on the rod string 8 to the installation site of the upper ШВН 10 with an input module equipped with longitudinal slots. Next, the top drive 2 of the ШВН 10 is mounted on the faceplate 5 with replacing the last rod with a polished rod 1 to create tightness in the stuffing box 3 of the upper drive of ШВН 2.

To determine the start time of the upper ШВН and to coordinate the operation of both the ШВН and ЭВН engines, the ШВН control station 26 with a frequency converter is connected to the top drive 2 engine, and the ЭВН control station 27 with a frequency converter is connected by a cable 16 to the ЭВН engine 23.

The connection of the reference node 21 of the lower EVN with a flexible shaft with the pump rotor 18 and further with a valve motor 23 equipped with a telemetry unit 25 with pressure, temperature and vibration sensors allows full control of all operating characteristics of the engine 23, for example, engine temperature, engine vibration, reception pressure pump, and by lowering or increasing the speed of the EVN 19, select the optimal mode of fluid withdrawal from the lower reservoir 24, not exceeding the productivity of the EVN 19, and determine the start time of the upper CVN 10 To coordinate the work of the two motors 10 and the PCP 19, PCP.

The relative position of all the installation nodes in the well when the ШВН is located, the rotor of which is connected by the rods to the upper frequency-controlled drive 2, above the upper layer 12 and the location of the second frequency-controlled voltage control device above the lower layer 24 and their coordinated interaction with separate frequency regulation by stations 26 and 27, when changing the composition of the produced products in each layer individually from clean to waterlogged to 99.9%, with the content of hydrogen sulfide, sand, proppant, asphaltenes, paraffin, and related products with viscous Tew than 10 000 mPas, to optimize the total performance of the installation, which makes it possible to regulate the productivity of the well as an increase to + 50%, and the reduction to - 40%.

Installation for the simultaneous production of oil from two layers works as follows.

EVN 19 pumps the oil and gas-containing fluid from the input module 20 of the EVN pump 19 through the tubing 7 from the bottomhole zone of the lower reservoir 24 to the overpacker zone of the upper pump ШВН 10.

The reservoir oil and gas-containing fluid along the tubing string 7 passes into the over-packer zone and, through the output module 14, equipped with longitudinal slots, is thrown into the annulus, where partial degassing and separation of free gas that rises through the annulus occurs.

To determine the start time of the upper ШВН and to coordinate the operation of both the ШВН and ЭВН engines, the telemetry unit 25 controls the pressure to adjust the speed of the lower ЭВН 19 using the control station 27 with a frequency converter, by lowering or increasing the speed of the ЭВН 19, choosing the optimal mode of fluid selection from the lower formation 24, not exceeding the performance of the pump.

In the case of using the EVN installation 19 without the telemetry unit 25 and the control station 27 with a frequency converter, the installation will not allow full pressure control at the intake of the EVN pump 19. And if the rotor speed is exceeded, the pump performance may not correspond to the actual flow of fluid from the reservoir 24, which can lead to to premature failure of the EVN installation 19. If the pump rotor rotates with a theoretical capacity higher than the actual inflow, the stator of the EVN 19 and its wedge will overheat.

According to the increase in the annular liquid level in the above-packer zone and according to the readings of the telemetry unit 25, the operability of the lower EVN 19 is judged and the upper drive 2 of the upper CVN 10 is launched.

When the column string 8 of the upper ШВН drive 2 is rotated and the torque is transmitted to the rotor 9 of the ШВН upper pump, the formation fluid begins to move through the gas separator 11, where the gas is separated into the annulus, and the liquid enters the ШВН pump 10 and then through the inlet module provided with longitudinal slots from the top ШВН 10 along the tubing string 7 to the oil reservoir.

Due to the decrease in the liquid level in the above-packer zone during the operation of the ШВН 10, the pressure decreases in the perforation interval 12, and the flow of liquid to the intake of the ШВН pump 10 starts from the upper oil horizon. Thus, the upper oil horizon is included in the operation. The control over the selection of liquid in the overpacker zone is carried out according to the dynamic level in the overpacker zone. The controlled rotor speed of the upper pump ШВН 10 is regulated by the control station with the frequency converter 26, coordinating the rotor speed for the total capacity of the lower pump ЭВН 19 and the fluid flow of the upper perforation interval 12.

In the case of using the ШВН 10 installation without a control station with a frequency regulator, the rotor speed will not coincide with the actual fluid withdrawal. At low revolutions of the rotor of the upper pump ШВН 10, the dynamic level will increase and the productivity of the upper layer 12 will partially decrease due to the hydrostatic level in the annulus, due to the operation of the lower pump ЭВН 19 and its transfer of fluid to the over-packer zone.

In case of high rotor speeds of the upper ШВН 10 pump, the level will decrease before the pump is received, and at the same time gas separator 11 will malfunction, followed by a free gas breakthrough to the ШВН10 pump intake, which in turn will disrupt the cooling of the pump due to liquid and a pump wedge or its premature failure.

Reception of a screw pump with a valve motor drive is located in a sub-packer zone. It can be positioned directly opposite the lower perforation interval and not be tied to the installation location of the uncoupling packer. The EVN installation with a valve engine can be lowered to a depth of 2400 meters. The pump has pressure characteristics for lifting produced products up to 2800 meters of water column. The pump drive is equipped with additional telemetry sensors, which are capable of transmitting complete information about the state of the engine and pressure at the pump intake, which is the main parameter for monitoring the selection of liquid from the lower zone, that is, the under-packer zone.

Separate frequency regulation of pumps is used on the upper and lower reservoirs, which makes it possible to regulate the well productivity both by increasing to + 50%, and by decreasing to -40%.

The unit is capable of pumping an oily liquid both in pure form and watered up to 99.9% with the content of hydrogen sulfide, sand, proppant, asphaltenes, paraffin and related products for oil production from wells with viscosities up to 10,000 mPas, since this type of pumps used refers to volumetric pumps and has no valve pairs. Also, this type of pump has a rubber cage along the entire length of the pump, which allows you to operate this type of equipment in wells with a high content of mechanical impurities.

When sand enters the pump intake, the rotor runs into a grain of sand when torsion. At the same time, a grain of sand does not damage the rotor material due to its being squeezed into the rubber cage and, when the liquid passes, it is washed with a stream passing through the pump and is pumped through pipes to the oil receiver.

Thus, the pump is capable of not only pumping viscous products, but also partially sucking the liquid directly into the pump itself, with subsequent adjustment of the performance of the pumps, both upper and lower, according to the results of complete control of the equipment and the technical parameters of the reservoir conditions.

The technical effect of the proposed technical solution is to expand the operational capabilities of the installation when developing a field with light, viscous and highly viscous oils, with a content of mechanical impurities of up to 35% and a water cut of from 0 to 99% according to the results of complete control of the equipment and technical parameters of the formation status, due to the relative positioning in the installation relative to productive formations and to each other, frequency-separately regulated electric screw pump with input and output modules, equipped with longitudinal slots, and a screw rod pump, packer, passive gas separator, telemetry unit.

Claims (2)

1. Installation for the simultaneous production of oil from two reservoirs, comprising a screw pump, a packer, lowered into the well at the tubing, characterized in that the screw rod pump, the rotor of which is connected to the upper frequency-controlled drive by rods, is located above the upper formation, the second a frequency-controlled electric screw pump is located above the lower layer, the support node of the electric screw pump is connected by a flexible shaft to the pump rotor connected to a valve motor equipped with a teleme block three with sensors of pressure, temperature and vibration; a packer is installed between the electric screw pump and the upper layer; the installation is additionally equipped with a passive gas separator installed under the rod screw pump with an input module and above the output module of an electric screw pump; the input module of the sucker-rod screw pump and the output module of the lower electric screw pump have longitudinal slots for introducing oil and gas-containing fluid from the lower horizon into the over-packer zone. 2. The installation according to claim 1, characterized in that it is additionally equipped with a control station for a rod-type screw pump with a frequency converter connected to the top drive motor and a control station for an electric screw pump with a frequency converter connected by a cable to the electric screw pump motor.

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