RU90859U1 - SYSTEM OF MULTI-STAGE LIFTING OF LIQUIDS FROM DRILLING WELLS - Google Patents

Abstract

1. The system of multi-stage lifting of liquids from boreholes, containing placed underneath the pump-modules, characterized in that the pump-modules are made in the form of interchangeable borehole pneumatic displacement pumps, interconnected by pipelines of vacuum, compressed gas, exhaust and associated gas produced fluid and power cable; pumps-modules of each stage are equipped with level sensors in each working chamber, an electric two-way pneumatic distributor, a control unit and a three-way valve having two positions: “vacuum” for the pump module of the lower stage and “exhaust gas” for all others; in each pump module, through channels of compressed gas or air, vacuum and exhaust gas are made, as well as a through wire of an electrical circuit; the pump module of the lower stage is equipped with a receiving pipe for suction of the liquid, and the pump module of the upper stage is connected to the pipeline for pumping the produced fluid to the surface; a high pressure pipeline is connected to the output of the compressed gas channel of the upper pump module; a vacuum pipeline is connected to the output of the vacuum channel of the upper pump module; an exhaust and associated gas pipeline is connected to the exhaust channel of the upper pump module; the power cable of the pump-modules is connected to the upper connector of the power supply wire. ! 2. The system of multi-stage lifting of liquids from boreholes according to claim 1, characterized in that when raising carbonated liquid to the inlets of the through channels of the lower stage pump module, vacuum, compressed gas, exhaust gas, and the lower connector, etc.

Description

The system of multi-stage lifting of liquids from boreholes can be used in any sectors of economic activity for lifting aerated and non-carbonated formation fluids, water, oil, condensate, from deep wells.

A known system of pneumatic vacuum lifting of oil according to patent RU 2291283 "Device for oil lifting pneumatic vacuum method" from 12/29/2004, published. 01/10/2007, IPC Е21В 43/00, containing a glass with holes placed in the casing with perforation, and a poppet valve, which, under the influence of hydrostatic pressure of the oil horizon, opens and passes oil to a certain level of the casing, in which it is later compressor create pressure and oil is fed to the wellhead. In this case, vacuum and pressure are created by the same compressor (switching the compressor “input” to “output”), which is installed in a warm room near the wellhead.

This system has low performance, fixing the glass in the casing is unreliable. The system is difficult to install due to the need to accurately combine the holes of the glass with the perforation of the casing.

The closest is a multi-stage fluid lifting system with submersible electric centrifugal pumps (ESP). (Handbook of oil production. Authors: V.V. Andreev, K.R. Urazakov, V.U. Dalimov and others; Edited by K.R. Urazakov, M. LLC Nedra-Business Center, 2000, chapter 6).

This system is not practical for wells with a flow rate of less than 40 cubic meters per day. When this system produces liquids with a high gas content, gas plugs form in the pump’s working chambers, which leads to unplanned shutdowns of the entire system during production.

The content of mechanical impurities of more than 0.5 g / l., Leads to increased wear of the pump parts, and frequent repairs.

This system consumes high voltage current, therefore there is a danger of electric shock to personnel.

The objective of the proposed technical solution is to create an electrically safe system that can be easily integrated into existing ones, easy to operate and maintain, allowing production from large depths of carbonated and non-carbonated liquids containing mechanical impurities, including from wells with small debit.

The problem is solved by a system of multi-stage lifting of liquids from boreholes containing module pumps located under each other, while the module pumps are made in the form of interchangeable borehole pneumatic replacement pumps, interconnected by pipelines, vacuum, compressed gas, exhaust gas and associated gas , produced fluid, and power cable; pumps-modules of each stage are equipped with level sensors in each working chamber, an electric two-way pneumatic distributor, a control unit and a three-way valve having two positions “vacuum” for the pump module of the lower stage, and “exhaust gas” for all others; in each pump module, through channels are made: compressed gas or air, vacuum and exhaust gas, as well as a through wire of the electrical circuit; a receiving pipe for suction of liquid is connected to the pump module of the lower stage, and a pipeline for pumping the produced fluid to the surface is connected to the pump module of the upper stage; a high pressure pipeline is connected to the upper exit of the compressed gas channel of the upper pump module, a vacuum pipeline is connected to the upper exit of the vacuum channel of the upper pump module, an exhaust and associated gas pipeline is connected to the upper outlet of the exhaust gas channel of the upper pump module; the power cable of the pump-modules is connected to the upper connector of the power supply wire; when lifting carbonated liquid to the inlets of the through channels of the pump module of the first stage - vacuum, compressed gas, exhaust gas, to the lower connector of the power supply cable, to the outlet of the exhaust gas channel, as well as to the input of the exhaust gas channel of the pump module of the second stage, sealed stubs; when lifting non-carbonated liquid, to the lower inputs of the through channels of the pump module of the first stage: vacuum, compressed gas, exhaust gas and the lower connector of the power supply cable and to the upper exit of the exhaust gas channel, as well as to the lower inputs of the exhaust gas channels of the pump modules of the remaining stages sealed plugs are installed; the control unit, two-way valve and sensors are powered by a 24 V electric circuit.

The presence of a three-way valve, which has two “vacuum” positions selected during installation, for the lower stage pump module and “exhaust gas”, for all others, allows the implementation of borehole pneumatic replacement pumps interchangeable, can be used at any stage of the systems, installing during installation left the three-way valve to the desired position, to the “vacuum” position, in order to create a vacuum on the lower stage pump module, to draw liquid into the working chambers, and to exhaust and associated gases on the module pumps GOVERNMENTAL stages, when set to "exhaust gas", as the need for absorption already there, and the liquid rises due to the pressure created by the compressed gas, and exhaust gas is expelled from the working chambers by the pressure of the rising liquid.

The presence of a three-way valve allows the use of a small-capacity vacuum pump in the process of fluid production, facilitates and simplifies the design of the entire system.

The use of a multi-stage system based on pneumatic pumps-substitution modules makes it possible to produce liquids containing mechanical impurities. This is due to the minimization of the use of friction elements in the design of pump modules.

Since all pump modules of a multistage system are interchangeable, this makes it possible to minimize the cost of their manufacture. All components used are mass produced and fairly cheap. These factors make production relatively inexpensive.

Since the working pressure in the pump modules, pipelines for the extraction of the product and compressed gas does not exceed 1.0 MPa, which makes it possible to make pump modules quite light and use light pipes, this makes the design of the pumps quite light and makes it possible to use a multi-stage system significant depths.

The system of multi-stage lifting of liquids from boreholes is shown in the drawings, in which Fig. 1 shows a system of multi-stage lifting of carbonated liquids from boreholes, Fig. 2 shows a system of multi-stage lifting of non-carbonated liquids from boreholes, Fig. 3 is an initial stage of operation of a multi-stage system and figure 4 is a subsequent step of the multi-stage system.

1, 2, 3, 4 show the pump module 1 of the lower stage, the pump module 2 of the second stage, the pump module 3 of the third stage, the pump module 4 of the N-1st stage, the pump module 5 of the upper stage, intermediate suspension cable 6, earring 7 top, earring 8 lower, cable 9 of a multi-stage suspension system, support flange 10, pipe 11 of the produced fluid, produced fluid 12, pipe 13 receiving the first stage, plugs 14, pipe 15 of the vacuum cable 16 power supply pumps modules, exhaust and associated gas pipeline 17, compressed gas pipeline 18, wells Ina 19 with casing, pneumatic directional control valve 20 electric two-way, control unit 21, three-way valve 22, working chamber 23 first, working chamber 24 second, float chamber 25 of the first working chamber, float chamber 26 of the second working chamber, float valve 27 with built-in permanent magnet the first working chamber, a float valve 28 with a built-in permanent magnet of the second working chamber, a saddle 29 lower than the first working chamber, a saddle 30 lower than the second working chamber, a saddle 31 higher than the first working chamber, a saddle 32 upper second th working chamber, a level sensor 33 of the first working chamber, a level sensor 34 of the second working chamber, a suction valve 35 of a first working chamber, a suction valve 36 of a second working chamber, a pressure valve 37 of a first working chamber, a pressure valve 38 of a second working chamber, a suction channel 39, channel 40 injection, channel 41 pneumatic vacuum of the first working chamber, channel 42 pneumatic vacuum of the second working chamber, vacuum channel 43, wire through 44 power supply, channel through 45 compressed gas, channel through 46 vacuum, channel through 47 trabotavshego and associated gas.

The system of multi-stage lifting of carbonated and non-carbonated fluids from boreholes is as follows.

The system consists of completely interchangeable pump modules (Figs. 1 and 2), which are borehole pneumatic displacement pumps, pump module of the lower stage 1, pump module of the second stage 2, pump module of the third stage 3, pump module N- 1 stage 4, the pump module of the upper stage 5, which are interconnected by pipelines; vacuum 15, compressed gas 18, exhaust and associated gas 17 (is not used in the production of non-carbonated liquid), produced liquid 11, and also an power cable 16. The system is suspended in the well on the support flange 10 with a cable 9 for the upper earring 7 of the upper pump module 5 , all other pump modules are suspended under each other by the lower earrings 8 of the upper pump modules and the upper earrings 7 of the lower pump modules by the intermediate cables 6.

In each pump module, through channels are made: compressed gas or air 45, vacuum 46 and exhaust gas 47, as well as a through wire of the electrical circuit 44.

The number of stages of a multistage system depends on the height of the liquid and is determined by the formula:

N = H / L

Where N is the number of stages of a multistage system;

H is the height of the liquid;

L is the distance between the pump modules (L = from 3 to 50 m.),

The operating pressure in any pump module of a multistage system does not exceed 1.0 MPa. This is enough, since each pump module of a stage of a multistage system is designed to lift the fluid only one stage, to a height of 50 meters, that is, to the pump module of the next stage.

When applying a working pressure exceeding 1.0 MPa, the distance between the pump modules, with a reinforced casing and parts, can be increased and exceed 50 m.

A receiving pipe 13 for suctioning liquid is connected to the pump module of the lower stage 1, and a pipe of the produced liquid 11 is connected to the upper pump module 5, which is designed to lift the liquid to the surface. At the lower inputs of the channels of the pump module 1 of the first stage: vacuum 46, compressed gas 45, exhaust gas 47 and a connector (not shown) of the power supply cable 44 and at the upper exhaust gas outlets, as well as at the lower exhaust gas inlet of the pump module steps, install sealed plugs 14. When producing non-carbonated liquid, plugs 14 are placed, in addition to those listed, also on the lower inlets of the exhaust gas channels of all other pump modules (figure 2).

When producing soda liquid, the module pumps, starting from the second stage to the top, are connected together the same (when producing non-carbonated liquid, all the system module pumps are connected the same way). A pipe 18 is connected to the upper outlet of the compressed gas channel 45 of the upper pump module 5, the other end of which is connected to a source of compressed gas or air (not shown in the drawing). A pipe 15 is connected to the upper exit of the vacuum channel 46 of the upper pump module 5, the other end of which is connected to a vacuum source (not shown in the drawing). A pipe 17 is connected to the upper outlet of the exhaust gas channel 47 of the upper pump module 5, the other end of which is connected to a compressor (not shown in the drawing) for pumping the exhaust and associated gas (only for producing carbonated liquid). To the upper connector of the power supply wire 44 is connected a cable 16 of the power supply of the pump modules, the other end is connected to a power source (not shown).

Each individual pump module of the multi-stage fluid lifting system is a borehole pneumatic dual-chamber displacement pump (FIGS. 3 and 4). It consists of working chambers 23 and 24 for suction and displacement of liquid. The chambers 23 and 24 are float chambers 25 and 26, communicating with the working chambers 23 and 24. In the float chambers are float valves with built-in permanent magnets 27 and 28, the purpose of which:

- short circuit of reed level sensors 33 and 34.

- overlapping seats 29 and 30 to prevent leakage of compressed gas or air into the discharge channel 40.

- overlapping saddles of the vacuum-pneumatic line 31 and 32 and preventing liquid from entering the vacuum-pneumatic channels 41 and 42.

The pumps have suction valves 35 and 36 and discharge valves 37 and 38. The pump is controlled by a control unit 21, which, according to the signals from level sensors 33 or 34, generates a command to switch the two-way valve 20.

The control unit 21, the two-way valve 20 and the level sensors 33 and 34 are powered by an electrical circuit with a voltage of 24 V.

A three-way valve 22 is built into the vacuum channel 43, connecting the pneumatic vacuum lines 41 and 42 of the pump module with the installation option “vacuum” connecting with the through channel of vacuum 46, or “exhaust gas” connecting with the through channel of exhaust and associated gases 47. Position of the three-way valve 22 each pump module is installed during the installation of a multi-stage system.

For liquid suction, the pump module is equipped with a suction channel 39, to which a receiving pipe 13 is connected.

To displace fluid from the working chambers 23 and 24, the pump module is equipped with a discharge channel 40, which is connected to the pipeline of the produced fluid 11.

The system of multi-stage lifting of carbonated liquids from boreholes is as follows.

On the pump module of the lower stage 1 of the system for the production of carbonated and non-carbonated liquids, the three-way valve 22 (Figs. 3, 4) is installed in the vacuum position during installation of the system, while channel 43 is connected to the through vacuum channel 46 to create a vacuum in chambers 23 and 24. On the pump modules of the remaining stages, the three-way valve 22 is set to the "exhaust gas" position, while the channel 43 is connected to the through channel of the exhaust and associated gases 47.

Each of the working chambers 23, 24 of all the pump modules operates alternately, if one of the chambers works to absorb liquid through the suction channel 39, the second chamber at this time works to displace the liquid through the discharge channel 40, and vice versa. Due to this create a continuous flow of fluid in the pipe 11.

Pump-modules are in standby mode until liquid enters one of the working chambers. When filling one of the chambers of the pump module of the second stage 2 with liquid, all 4 chambers of both stages work simultaneously. When filling with liquid one of the chambers of the pump module of each subsequent stage, all chambers of the involved stages work.

Let us consider in more detail the operation of the system.

From a source of electricity (not shown) on a cable 16, power is supplied to all pump modules (Figs. 1, 2, 3, and 4). Compressed gas or air enters through the pipeline 18 to all pump modules, while one of the working chambers 23 or 24 of all pump modules is filled with compressed gas or air until the maximum value of the working pressure equal to the pressure in the compressed gas pipeline 18 is reached.

At the same time, through a pipe 15, in one of the working chambers of the pump module 1 of the lower stage, a vacuum is created due to the installation of a three-way valve 22 in the “vacuum” position.

When producing carbonated liquid, by setting the three-way valve 22 to the “exhaust gas” position, the exhaust and associated gas are pumped through a pipe 17 through an exhaust gas through passage 47 from pump modules of all stages except the lower one. When producing non-carbonated liquid, by setting the three-way valve 22 to the “exhaust gas” position, the exhaust compressed air is removed from the pump modules into the well through the through channel of the exhaust gas 47 from the pump modules of all stages except the lower one.

Which of the chambers of the pump-modules at the initial moment of operation of the system will be filled with compressed gas or air, depends on the position of the valve 20 at the time the system starts to work. In this case, the magnetic float valves 27 and 28, on all pump modules, being in the lower position, will block the seats 29 or 30 and will prevent the leakage of compressed gas or air.

Simultaneously with the supply of compressed gas or air (Fig. 3), one of the channels, depending on the position of the air distributor 20, for example, through the channel 42, into the chamber 24, of the lower stage pump module 1, is created in the other chamber 23 through the channel 41 vacuum. In the chamber 23, a vacuum is created, as a result of which, through the inlet pipe 13 immersed in the liquid 12, the suction channel 39 and through the suction valve 35, liquid begins to flow into the chamber 23, while the magnetic float valve 27 pops up until reaches the reed switch level sensor 33, which supplies a signal to the control unit 21, which generates a command to switch the two-way valve 20.

After switching the air distributor 20 (Fig. 4), now compressed gas or air already enters the chamber 23 of the lower pump module through the channel 41, while displacing the liquid into the chamber 24 of the pump module 2 of the second stage, through the valve 37 through the discharge channel 40 , the pipe 11 and the suction channel 39 through the suction valve 36, and atmospheric air located in the working chamber 24 (atmospheric air is in the working chambers of all pump-modules only until the first suction cycle, only compressed gas will be displaced during operation) from it by the incoming liquid through the seat 32 through the pneumatic-vacuum channel 42 through the pneumatic distributor 20 through the channel 43 through the three-way valve 22, which is set to the "exhaust gas" and the through channel of the exhaust and associated gases 47 through the pipeline of exhaust and associated gases 17 further to the surface .

At the same time, a vacuum is created in the chamber 24 of the lower pump module 1 through the channel 42, which sucks in the liquid 12 through the pipe 13 and the suction channel 39 through the valve 36, and the compressed gas inside it is removed into the vacuum pipe 15 through the seat 32 through the pneumatic -vacuum channel 42 through the air distributor 20 through channel 43 through a three-way valve 22, which is installed in the "vacuum" position and the through channel of vacuum 46 through the vacuum pipe 15 to the surface to the source of vacuum. As liquid enters the working chambers 24, the magnetic float valves 28 of the pump modules 1 and 2 float until they reach the reed level sensors 34, which signal the control units 21 of the pump modules 1 and 2, which form commands switching two-way valve 20, each of the pump modules 1 and 2.

At the same time, fluid is displaced from the chamber 23 of the lower pump module 1. Thus, the cycle is repeated on all involved pump modules, which leads to a continuous rise in liquid until the supply of compressed gas or air, power supply or vacuum to the pump modules is stopped.

When producing non-carbonated liquid, the principle of operation of pump-modules is the same as in the production of carbonated liquid.

The use of a multi-stage system for oil production based on borehole pneumatic pump-replacement modules, which use a minimum of rubbing elements and lightweight, through the use of plastic resistant to aggressive environments, as well as light metal alloys makes it possible to produce oil with a high content of solids with a large depths.

The principle of the system allows the production of a liquid with a high content of associated gas, as it is sucked out of the working chambers of the pump modules as it is released from the liquid and does not interfere with the operation of the pump modules.

When liquid is extracted from any depth, the working pressure in the pipelines for the extraction of the product and the compressed gas or air of the system does not exceed 1.0 MPa, which allows the use of lightweight pipes and lightweight module pumps.

This makes the entire suspension structure of the system light enough and makes it possible to use it at considerable depths.

All pumps-modules of the system are interchangeable, which makes it possible to minimize the cost of manufacturing the system.

It is easy to adjust the performance of the downhole pump to the debit of the well, since the performance of the system can vary over a wide range, for this it is enough to change the pressure of compressed gas or air and the degree of vacuum vacuum.

When using this system, environmental pollution does not occur, since all pipelines are tight.

The supply voltage of the pump modules does not exceed 24 V, since low-voltage equipment is used in the control units of the system, this makes the use of the pump system safe for people and animals.

Claims (4)

1. The system of multi-stage lifting of liquids from boreholes, containing placed underneath the pump-modules, characterized in that the pump-modules are made in the form of interchangeable borehole pneumatic displacement pumps, interconnected by pipelines of vacuum, compressed gas, exhaust and associated gas produced fluid and power cable; pumps-modules of each stage are equipped with level sensors in each working chamber, an electric two-way pneumatic distributor, a control unit and a three-way valve having two positions: “vacuum” for the pump module of the lower stage and “exhaust gas” for all others; in each pump module, through channels of compressed gas or air, vacuum and exhaust gas are made, as well as a through wire of an electrical circuit; the pump module of the lower stage is equipped with a receiving pipe for suction of the liquid, and the pump module of the upper stage is connected to the pipeline for pumping the produced fluid to the surface; a high pressure pipeline is connected to the output of the compressed gas channel of the upper pump module; a vacuum pipeline is connected to the output of the vacuum channel of the upper pump module; an exhaust and associated gas pipeline is connected to the exhaust channel of the upper pump module; the power cable of the pump-modules is connected to the upper connector of the power supply wire. 2. The system of multi-stage lifting of liquids from boreholes according to claim 1, characterized in that when raising carbonated liquid to the inputs of the through channels of the lower stage pump module, vacuum, compressed gas, exhaust gas and the lower connector of the power supply wire and to the output of the exhaust gas channel , as well as airtight plugs are installed at the inlet of the exhaust gas channel of the pump module of the second stage; 3. The system of multi-stage lifting of liquids from boreholes according to claim 1, characterized in that for lifting non-carbonated liquid to the inputs of the through channels of the lower stage pump module - vacuum, compressed gas, exhaust gas and the lower connector of the power supply wire and to the output of the exhaust gas channel as well as at the inlet of the exhaust gas channels of the pump modules of the remaining stages, sealed plugs are installed; 4. The system of multi-stage lifting of liquids from boreholes according to claim 1, characterized in that the control unit, a two-way pneumatic distributor and sensors are supplied with a voltage of 24 V.