RU2611786C2 - Single packer pump facility for fluid production from two well formations - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: facility comprises a lift pipe string installed in the casing pipe, wellhead and two sections mounted in the casing pipe with a fitting assembly. The lower section contains a double-armature packer with a facility receiving fluid from the lower formation, where the upper section - a submersible motorized pump with submersible telemetry unit (STU) joined with the frequency-controlled submersible electric motor (SEM) of the submersible motor-driven pump, motorized throttle valve with a shutter and shut-off valve seat connected mechanically and electrically with the STU with measuring means of one or more formation parameters including pressure measuring sensor, and is provided with a centering part to connect fitting assembly part of the upper section toits return past at the lower section. Shutter-by-wire throttle valve is configured to cut off automatically fluid flow from the lower formation in the shut-off valve seat in case of emergency power cutoff of the well. The facility is equipped with a telemechanical system (TMS) with automatic control of a submersible electrically driven pump and a throttle valve after measuring formation parameters; the system comprises at least another pressure measuring sensor and a facility to register fluid proceeds from the lower formation installed at the entering point of the fluid from the lower formation to the shut-off valve seat of the throttle valve, and a facility of the cumulative registration of the fluid production from both well formations mounted at least at the outlet of motor-driven, electrically connected to the well control station and the unit receiving and processing information with one or more conductors of electrical cable installed inside STU through pump motor windings and the wellhead.

EFFECT: design simplification and well operation reliablity improvement.

3 cl, 1 dwg

Description

The invention relates to the field of mining, in particular to oil production, and can be used to produce fluid from two layers of one well.

A well-known pumping unit for the operation of formations in a well, comprising a string of lift pipes, a cable, a liner, packers coupled to the liner and separating the well into sections including well formations, an electric submersible pump with an input module and a casing surrounding the electric motor together with the cable and ending on the input module of the electric submersible pump, and a regulator providing the ability to turn on and off the electric submersible pump when the specified bottomhole pressure is reached in one of the sections and communicated I with its housing cavity through a corresponding passage provided in the shank. The regulator includes a ground control unit, pressure gauges for measuring bottomhole pressure in the area, and electrovalves installed in the respective channels of the liner, each of which communicates with one of the sections of the well. On the casing made node tight cable entry. The ground control unit, solenoid valves and manometers are functionally connected to the control unit. (Patent RU 2339795. Pumping unit for the operation of formations in a well. IPC: Е21В 43/14. - 11/27/2008).

A known installation for simultaneous and separate research and operation of an electric submersible pump of a multilayer well, comprising a one-packer arrangement consisting of a pipe string with an electric submersible pump equipped with a casing connected to a control valve, the latter is connected to the packer from the bottom and consists of at least two hydraulically interconnected non-axial and one axial passage channels, inside of which is placed a shut-off element such as a piston, plunger, shutter or rotary disk, having the ability to control from the surface of the well through a cable or pipe, or a pipe string, or medium, or automatically from the fluid parameters, moreover, in one of its positions, all the flow channels are hydraulically, partially or completely, communicated both with the reception of the electric submersible pump through the casing and wellbores for simultaneous production of fluid from them, and, conversely, in a different position, to cut off the fluid flow from at least one formation by closing the inlet or outlet of the corresponding off-axis passage channel. (Patent RU 2380522 C1. Installation for simultaneous and separate exploration and exploitation of a multilayer well by electric submersible pump (options). - IPC: Е21В 43/12, Е21В 47/12. - January 27, 2010).

A single-packer device is known for simultaneous and separate production of fluid from two reservoirs of a well, comprising a centrifugal pump with a receiving module and an electric drive, lowered into the casing on a tubing string, equipped with a casing connected by a cross-flow coupling of fluid flows with a liner, forming a fluid mixing chamber from different layers of the well, communicating, on the one hand, with the eccentric channels of the coupling and, on the other, with the receiving module of the pump, and the central channel with the upper layer of the wells through the radial holes of the coupling, the packer and two control valves. In the central channel of the coupling there is a fluid cut-off valve of one of the control valves with an electric actuator located in a cylinder mounted on top of the coupling. A shank is attached to the cross-flow coupling, mating from the bottom to the docking unit in which the second control valve is located. The control valves are equipped with sensor blocks of instrumentation and are connected with the telemetry unit mounted on the end of the pump electric drive, with the ability to control the control valves from the surface of the well through an electric cable or automatically. The docking unit is connected to the lower fluid reservoir intake made with the packer barrel. (Patent RU 2523590 C1. Single-packer device for simultaneous and separate production of fluid from two layers of the well. IPC: Е21В 43/12, Е21В 43/14. - July 20, 2014).

The main disadvantage of the known technical solutions is the lack of control over the parameters of the produced product, in particular, control over the flow rate of the wellbore.

A known installation for producing fluid from two layers of a well containing a pipe string, two sections connected by a disconnector-connector, the lower section containing a packer, a liner with a plug, a fluid receiving device from the lower reservoir with bypass valves, and the upper section with an electric drive pump with a submersible electric motor powered by electric current through a cable, with a submersible telemetry unit equipped with a pressure sensor, an electric valve with a locking mechanism, an electric circuit connected through a winding ki of a submersible electric motor, and a cable with a control station and a unit for receiving and processing information. The installation contains a node that excludes the influence of a submersible electric motor on the power line of an electric cable, measuring and transmitting information. (Patent RU No. 2546218 C1. Method for the study of productive formations during simultaneous and separate operation of a multilayer well and installation for its implementation. IPC: Е21В 43/14, Е21В 47/06. - 04/10/2015). This technical solution is taken as a prototype.

The main disadvantage of the known technical solution adopted for the prototype is the overflow valves that are excessively built into the receiving device, which are unsuccessful in suctioning the fluid, and the inability to promptly maintain productivity and simultaneously separately monitor the parameters of both layers of the well, making it difficult to control the unit in real time.

The main task to be solved by the claimed invention is directed is the ability to automatically maintain the specified parameters of the productive formations simultaneously and separately in real time, as well as to monitor and record changes in the physical quantities of formation fluids of the well.

The technical result is to simplify the design of a single-pack pumping unit for producing fluid from two layers of the well and increase the reliability of the operation of the well.

The specified technical result is achieved by the fact that, in a known single-pack pumping unit for producing fluid from two reservoirs of a well containing a string of lift pipes and two sections connected by a docking station, the lower section contains a packer with a device for receiving fluid from the lower reservoir, and the upper section - a submersible electric drive pump with a submersible telemetry unit including a pressure sensor and other means of measuring reservoir parameters associated with the well control station and the information receiving and processing unit and one or more wires of an electric cable laid inside the telemetry unit through the windings of the submersible pump electric motor, an electric throttle valve with a shutter and a locking seat, connected mechanically and electrically to the telemetry unit, according to the proposed technical solution,

it is equipped with a telemechanical system with the ability to automatically control a submersible electric drive pump and a butterfly valve according to the results of measuring the parameters of the reservoirs, which additionally contains at least a pressure measuring sensor and a meter for recording fluid from the lower reservoir installed in front of the fluid inlet from the lower reservoir into the throttle locking seat valves, and a device for the total accounting of fluid production from both layers of the well - at the outlet of at least the electric drive pump, electric and associated with one or more conductors of electrical cable to the control station and the block bore receiving and information processing;

part of the docking unit of the upper section is equipped with a centralizer when mounting it with the mating part of the lower section;

the shutter of the electric throttle valve is configured to automatically cut off the fluid flow from the lower reservoir in the event of an emergency shutdown of the well’s power supply.

The analysis of the prior art by the applicant has made it possible to establish that there are no analogues that are characterized by sets of features identical to all the features of the claimed single-pack pumping unit for producing fluid from two well strata. Therefore, the claimed technical solution meets the condition of patentability "novelty."

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

The claimed technical solution can be used in oil wells according to the adopted technology. Therefore, the claimed technical solution meets the condition of patentability "industrial applicability".

The presented figure schematically shows the proposed single-pack pumping unit for the production of fluid from two layers of the well.

A single-pack pumping unit for producing fluid from two layers of a well contains installed in the casing 1, made with perforations in the wall at the level of the productive upper formation A and lower formation B, the string of lift pipes 2, wellhead fittings 3 and two sections mounted in the casing 1 using the docking unit 4, while the lower section contains a biconductor packer 5, uncoupling layer A and B, with a device 6 for receiving fluid from the lower layer B, and the upper section is a submersible electric drive pump 7 with a submersible telemetry unit ( PT) 8, an electric drive throttle valve 9 with a shutter 10 and a locking seat 11, mechanically and electrically connected to the BPT 8, attached to the end of the frequency-controlled submersible electric motor (PED) of the submersible electric drive pump 7, including means for measuring one or more parameters of the formations, including a pressure measurement sensor (P _total ), and is equipped with a centralizer 12 for connecting part of the docking unit 4 of the upper section with its counterpart on the lower section. The shutter 10 of the electric throttle valve 9 is configured to automatically cut off the fluid flow from the lower reservoir B in the locking seat 11 in the event of a power failure in the well. The installation is equipped with a telemechanical system (TMS) with the ability to automatically control a submersible electric drive pump 7 and a throttle valve 9 according to the results of measuring the parameters of formations A and B, containing at least a second pressure measurement sensor 13 (P _n ) and a device 14 for recording fluid intake ( Q _n ) from the lower formation B, installed in front of the fluid inlet from the lower formation B into the locking seat 11 of the throttle valve 9, and the device for the total recording of fluid production ΣQ = Q _{в +} Q _n from both layers A and B of the well (not shown conditionally), mouth renewed at the outlet of at least the electric drive pump 7, electrically connected with the well control station 15 and the information receiving and processing unit 16 with one or more wires of the electric cable 17, laid inside the BPT 8 through the windings of the SEM of the pump 7 and wellhead fittings 3.

Single-pack pumping unit for producing fluid from two layers of the well operates as follows.

Installation of a single-pack pumping unit in the casing 1 of the well is performed in two stages. First, the lower section of the installation is lowered into the well on the pipe string and a biconductor packer 5 is installed between the productive formations A and B and, with reciprocating movements, fix it in the casing 1 with two anchor devices. Then, the upper section of the installation is lowered into the casing 1 of the well on the string of elevator pipes 2. Both sections of the installation are connected in the casing 1 by pairing the parts of the docking station 4, the electric cable 17 is passed through the wellhead 3, which is fixed over the well string of elevator pipes 2, and the electric cable 17 is connected to the control station 15 of the well, while due to the lack of the power supply of the well, the locking seat 11 of the electric throttle valve 9 is closed by a shutter 10, isolating the fluid flow of the lower reservoir B.

при условии [Н_max]≥Н≥[H_min], где

. При Н<[Н_max] ТМС затвором 10 открывает запорное седло 11 электроприводного дроссельного клапана 9 и флюид из нижнего пласта Б через устройство 6 приема флюида из нижнего пласта Б, ствол двуякорного пакера 5, стыковочный узел 4 и открытое запорное седло 11 поступает под давлением Р_н нижнего пласта Б в надклапанную полость дроссельного клапана 9 и через отверстия в боковой стенке поступает в межтрубное пространство скважины, в котором смешивается с флюидом верхнего пласта А и насосом 7 по колонне лифтовых труб 2 перекачивается через устройство суммарного учета добычи флюида ΣQ=Q_в+Q_н из обоих пластов А и Б на поверхность скважины. Информация о замерах дебита (Q_н) и давлении Р_н нижнего пласта Б, а также дебита скважины в целом ΣQ=Q_e+Q_н и давлении столба флюида в межтрубном пространстве скважины Р_общ передается по электрическому кабелю 17 на станцию управления 15 и блок 16 приема и обработки информации, от которых идёт обратно в виде команд к частотно-управляемому ПЭД насоса 7 и электроприводу дроссельного клапана 9. При ΣQ≤Q_н ТМС снижает поток флюида из нижнего пласта Б путем уменьшения просвета запорного седла 11 затвором 10 электроприводного дроссельного клапана 9, тем самым снижает депрессию верхнего пласта А. При Р_н<Р_общ ТМС также снижает поток флюида из нижнего пласта Б путем уменьшения просвета запорного седла 11 затвором 10 дроссельного клапана 9, тем самым снижает депрессию нижнего пласта Б. При этом по мере изменения уровня столба флюида Я в межтрубном пространстве ТМС увеличивает или убавляет частоту вращения n_об/мин ПЭД погружного насоса 7.After installing a single-pack pumping unit from the control station 15, a cable 17 supplying the frequency-controlled PEM of the electric drive pump 7 is supplied with power to the installation's TMS, while fluid from the upper formation A passes through the perforations in the wall of the casing 1 and acts on the sensor BPT pressure measurement 8. The fluid pressure in the annulus increases for a certain time to the reduced value of P _in , which determines the level H of the fluid column of the upper reservoir A relative but a submersible electric drive pump 7, and the fluid of the lower reservoir B through the fluid receiving device 6 acts on the pressure measuring sensor 13 and at the same time interacts with the fluid production metering device 14 from the lower reservoir B. Information about the measurements of the fluid pressure P _{in the} upper reservoir A by the BPT sensor 8 and the pressure R _{n the} lower reservoir B sensor 13 is transmitted by electric cable 17 to the control station 15 and the block 16 for receiving and processing information, based on which the submersible electric drive pump 7 is launched into operation with a speed n _{/ min} SEM corresponding to the level N of the fluid column in the borehole annulus, sufficient for productive work submersible electrically driven pump 7, in other words -

subject to [H _max ] ≥H≥ [H _min ], where

. With H <[H _max ], the TMS shutter 10 opens the locking seat 11 of the electric throttle valve 9 and the fluid from the lower formation B through the fluid receiving device 6 from the lower formation B, the barrel of the double-arm packer 5, the docking unit 4 and the open locking saddle 11 is supplied under pressure R _{n of the} lower formation B into the nadklapanny cavity of the throttle valve 9 and through the holes in the side wall enters the annulus of the well, in which is mixed with the fluid of the upper formation A and the pump 7 through the column of elevator pipes 2 is pumped through the device Mainly recording fluid production ΣQ = Q _in + Q _n from both reservoirs A and B to the surface of the well. Information on the measurements flow rate (Q _n) and a pressure P _and the lower layer B, and the well production generally ΣQ = Q _e + Q _n and a pressure of the fluid column in the annulus of the well P _commonly transmitted via electrical cable 17 to the control station 15 and the block 16 receiving and processing information from which it goes back in the form of commands to the frequency-controlled PED of pump 7 and the electric drive of the throttle valve 9. When ΣQ≤Q _{n, the} TMS reduces the fluid flow from the lower reservoir B by reducing the clearance of the locking seat 11 by the shutter 10 of the electric drive throttle valve 9 topics with reduces depression by direct upper layer A. When P _n <P TMS _commonly also reduces the fluid flow from the lower reservoir B by reducing the lumen 11 of the locking bolt seat 10 of the throttle valve 9, thereby reducing the depression of the lower layer B. In this case, as the level changes in the fluid column I in the annular space of the TMS increases or decreases the rotational speed n _rpm SEM of the submersible pump 7.

An advantage of the proposed single-pack pumping unit for producing fluid from two wellbores compared to known installations is the ability to quickly maintain wellbore productivity by influencing changes in the parameters of productive formations on the operation of a submersible electric drive pump and an electric drive throttle valve, as well as to quickly record produced fluid.

Claims (3)

1. A single-pack pumping unit for producing fluid from two reservoirs of a well, comprising a column of elevator pipes and two sections connected by a docking unit, the lower section containing a packer with a device for receiving fluid from the lower reservoir, and the upper section a submersible electric drive pump with a submersible telemetry unit including a pressure sensor and other means of measuring reservoir parameters associated with the well control station and the information receiving and processing unit with one or more wires of an electric cable, lay inside the telemetry unit through the windings of a frequency-controlled submersible pump electric motor, an electric throttle valve with a shutter and a locking seat, mechanically and electrically connected to the telemetry unit, characterized in that it is equipped with a telemechanical system with the ability to automatically control the submersible electric drive pump and throttle valve according to the results measuring the parameters of the layers, additionally containing at least a pressure measuring sensor and a device for recording the flow of flu uids from the lower reservoir, installed in front of the fluid inlet from the lower reservoir into the throttle valve shut-off seat, and a device for the total recording of fluid production from both layers of the well - at the outlet of at least the electric drive pump, electrically connected by one or more wires of the electric cable to the station well control and a block for receiving and processing information. 2. The pump installation according to claim 1, characterized in that the part of the docking unit of the upper section is provided with a centralizer when mounting it with the mating part of the lower section. 3. The pump installation according to claim 1, characterized in that the shutter of the electric throttle valve is configured to automatically cut off the fluid flow from the lower reservoir in the shut-off seat in the event of a power failure in the well.

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