EA031425B1 - Pump station based on a horizontal pumping set and a multi-phase pumping unit - Google Patents

Abstract

The invention is related to the field of petroleum machinery manufacturing and can be used in the oil and gas producing industry for pumping over gas-liquid mixtures of various viscosities and for injection of water from underground and surface water sources. The technical objective of the invention is protection of equipment against corrosive environment or great temperature differences, reduction of capital investments, shortening of new facilities commissioning times, and a rise in profitability. Said technical objective is attained by provision of a pump station including a horizontal pumping set (plant) based on a multi-phase pump and a centrifugal pump installed in the same premises module. The pumping station consists of two or more motor-driven pumps mounted on the same mounting frame, control units for each pump, an operator's workplace, and inlet and outlet lines. The proposed invention is characterized in that the pump station includes a horizontal multi-phase pumping unit (HMPU) having a suction line and a delivery line for pumping over a multi-phase fluid from production wells; and a horizontal centrifugal pumping set (HPS) having a suction line and a delivery line for water injection into water-injection wells of reservoir pressure maintenance systems at oil fields.

Description

The invention relates to the field of petroleum engineering in the oil and gas industry for pumping gas-liquid mixtures of different viscosity and injection of various waters from underground and surface sources. An object of the invention is to protect equipment from the effects of an aggressive external environment, a large temperature difference, a reduction in capital investment, a reduction in the time it takes to commission new facilities and an increase in profitability. The stated technical problem is solved by a pumping station, which has in its composition a horizontal pumping complex (unit) based on multiphase and centrifugal pumps installed in one block-room. The pumping station consists of two or more pumps with electric drives that are installed on the mounting frame, control units for each pump, the operator’s workplace, as well as input and output lines. The present invention differs in that the composition of the pumping station includes a horizontal multiphase pumping unit (MFNU), which has a suction and discharge line for pumping a multiphase medium from the production wells; horizontal centrifugal pump unit (GCS), which has a receiving and injection lines, for pumping water into injection wells of the systems for maintaining reservoir pressure of oil fields.

The technical field to which the invention relates.

The invention relates to the field of petroleum engineering in the oil and gas industry for pumping gas-liquid mixtures of different viscosity and injection of various waters from underground and surface sources.

Extraction from the reservoir of reservoir oil to the surface through the system of producing wells. Together with oil, significant volumes of produced water as a displacing agent, associated (oil) gas, solid particles of mechanical impurities (rocks, hardened cement) are extracted from the depths. Therefore, downhole production of oil fields is always a complex multi-phase multicomponent dispersed system.

To collect well production and deliver it to its destination, oil fields are equipped with appropriate equipment and a pipeline system that provides:

1) transfer of a three-phase mixture (oil, gas and water) through separate pipelines to the metering and metering unit;

2) separation of well production into liquid and gas components;

3) transportation of gas to the preparation points or to the consumer;

4) transportation of oil to the collection points;

5) separation and purification of the aqueous phase from oil;

6) transportation of water to pumping stations;

7) water injection into injection wells.

The level of technology

Known devices [see Kaplan LS Improving the technology of water injection into the reservoir Oil industry, 2001, № 7, p. 49-50], realizing the method of PPD by pumping water into the injection well from a hole specially drilled next to it, into which an electrocentrifugal pump (ESP) is lowered. Receiving or fresh water is supplied to receiving the ESP through low pressure water supply, and the ESP installation is discharged and connected to the injection well. A device that implements the PPD method by pumping water through a specially organized pit requires capital expenditures on the construction of a large-diameter pit;

Submersible centrifugal pumps of the ESP type, used in the pit, have limited application due to low productivity and coefficient of performance (EFF);

the coefficient of performance (EFF) of a submersible centrifugal pump of the ESP type used in a pit is significantly reduced when operating in modes other than nominal;

when using water from high-pressure conduits, the reliability of the pump in the hole and the hole equipment decreases (with high pressure at the pump intake, the durability of the sealing assemblies is reduced and the load on the hole casing is high).

Known installation for downhole pumping water from the lower reservoir to the upper (see I. Andreev and others. Interwell and downhole pumping of water in the reservoir pressure maintenance system, JSC VNIIENG, 2006, p. 107, Fig. 3.3.6), containing inverted ESP, in which the engine is located above the pump, and a packer that separates the layers.

The disadvantages of the installation are the complexity of the design, the inability to ensure the cooling of the engine with the close placement of the aquifer and productive layers.

Known pumping station with one or more centrifugal pumps of the type of central nervous system and engines installed in the block room on the mounting frame, receiving and pressure pipelines, bypass line, control system, operator's workplace (see the book. Ivanovsky V.N. and others. Equipment for oil and gas production, part 2, M., Oil and gas, 2003, pp. 477-494).

The disadvantages of these pumping stations are low efficiency, compressed Q-H operating range of characteristics, high power consumption, labor-intensive installation and dismantling, large metal consumption, high operating costs.

Also known methods of pumping the production of oil wells, including the separation of multicomponent gas-containing mixture before entering the pumping station [Oil field equipment. Directory. Ed. E.I. Buhalenko. M., Nedra, 1990, p. 425].

The disadvantage of this method is the need for complete removal of gas from the liquid fraction during separation (complexity of the process), as well as the loss of gas and negative environmental consequences when it is burned in a flare unit.

The use of multiphase pumping stations for pumping products leads to a noticeable decrease in field installations, which significantly reduces the overall costs of field development.

The main feature of multiphase technology is to significantly reduce the pressure at the wellhead, which allows to increase the productivity of this particular well. At the same time, the extracted crude oil is immediately pumped into the pipeline and sent to the oil treatment installation (OTF), where it is further divided into fractions. The absence of a multiphase installation leads to the construction of a booster pump station (CSN) and transportation of its components (oil and gas) separately via different pipelines to the OTF and gas compressor station (GCS). Nali

- 1 031425 which multiphase pump installation allows transportation of oil and gas liquid using only one pipe. The mixture, passing through a multiphase pumping station (MFNS), receives additional pressure and again, via one pipe, goes to the OTF and then to the GCS and the oil metering station. At the same time, there is no need to build expensive separator and gas pumping stations, water separators and other metal-intensive equipment, which significantly reduces the environmental impact of the oil production process due to the absence of the need to burn associated petroleum gas in flares.

There are various technical solutions for the injection of gas-liquid mixture: pumping installations containing metering and booster piston pumps interconnected by means of a pipeline and a valve [a.s. USSR № 1585545, cl. F04E 23/00, publ. 15.08.90], pumping stations with preliminary separation of the production of oil wells in front of the station into oil, water and gas, followed by separate injection and mixing after the station [US Pat. Of the Russian Federation No. 2007659, cl. F17D 1/00, publ. 1994].

The disadvantages of the known technical solutions are the complexity of the design, low reliability in operation and the high cost of pumping stations that implement these technical solutions.

The closest to the technical nature of the claimed invention Pumping station for pumping fluid and water injection "is a horizontal multiphase pump unit based on gerotor pump [RU 58150 U1, publ. 10.11.2016, IPC E21V 4/00], which has a receiving and injection lines, for pumping a multiphase medium from production wells.

A distinctive feature of the invention is that in addition to the multiphase pumping unit (MFNU), the pumping station includes a horizontal centrifugal pump unit (GCS), which has a suction and injection lines and is designed to inject water into the injection wells of the reservoir pressure maintenance systems of oil fields installed in one block room.

The pumping station consists of two or more pumps with electric drives, which are mounted on the mounting frame, control units for each pump, the operator’s workplace, as well as individual input and output lines.

The present invention is illustrated in the drawing, which shows a pumping station with horizontal multiphase and centrifugal pumping units.

The pumping station for pumping fluid and pumping water contains a horizontal pumping complex of centrifugal type 1 and a multiphase pumping complex 2, a control system for pumping complexes 3, an operator’s workplace 4, receiving lines 5 and 7, pressure lines 6 and 8, a lifting device 9, which are located in one block room 10.

A horizontal centrifugal pumping complex (GCS) 1 consists of a pump 11, a discharge unit or a receiving module 12 (depending on the design of the pump 11), an electric motor 13, a mounting frame 14 and depending on the design of the GC multiplier and cooling units.

The pump 11 is a multi-stage and in the general case multi-sectional design, where the number of sections varies from one or more, connected in series or / and in parallel. The number and location of sections depends on the volume of injected water, on the depth of the watering formation, its permeability, etc.

The section consists of a housing, a shaft, a package of steps (impellers and guide vanes), a head, a base, radial bearings and, depending on the design of the pump, axial bearing units.

The discharge unit (thrust chamber) 12 is designed to perceive the axial forces acting on the shaft, arising from the pressure of the pumped medium. Thrust bearings are installed in the chamber, which absorb the axial pressure. To protect against overflows of the pumped liquid over the shaft and thrust bearings, an end seal is installed in the housing of the stop chamber. The receiving chamber is attached to the flange of the thrust chamber.

The input module 12 is designed to supply the pumped liquid to the pump.

The motor 13 is designed to convert the supplied electrical energy into mechanical (creating torque) and serves as a drive pump GNK 1.

The multiplier is designed to increase the rotational speed of the pump shaft and distribute the torque between the pump sections during their parallel operation.

The cooling unit serves to cool the oil multiplier.

The mounting frame 14 is designed to accommodate the nodes of the GNC 1 and 2, ensuring their alignment and alignment.

The control system 3 provides manual and automatic start-up, shutdown of the STC 1, pressure control and protection from overload or underload of the electric motor 13, the ability to turn off the STS by flow meter signals, automatic control of electric locks during start-up and shutdown of the STS, etc.

The receiving line 5 is designed to supply the pumped medium to the pump from the installation of its preparation. Valves, coarse and fine filters can be installed on the receiving line.

Pressure line 6 is designed to supply the pumped medium to the injection well. On the pressure line can be installed valves (including electrically controlled), check valve and valve

- 2 031425 flow meter.

Lifting device 9 is designed for installation and disassembly of nodes GNK 1 and 2.

The pumping system GNK 1 works as follows.

The working medium through the pipeline from the installation of water treatment enters the receiving line 5 of the pumping unit of GNK 1, then to the discharge unit or the input module 12 and to the pump 11, where the rotating impeller communicates the circular movement of the fluid between the blades. Due to the centrifugal force that arises, the fluid from the center of the wheel moves to the outer exit, and the vacated space is again filled with fluid coming under the action of the generated vacuum. From the impeller, the fluid is thrown into the guide vane, which guides the fluid through its channels to the center of the next wheel. Due to this forced deviation of the fluid flow, pressure is created on the inner walls of the guide vane. Thus, the velocity energy is converted into pressure energy. Next, the working fluid through the pressure line 6 through the pipeline under pressure is fed into the injection well.

The multiphase horizontal pumping complex (MFNU) 2 consists of the pump 21, the drive housing 22, the spindle 23, the propeller shaft 24, the gearbox 25, the electric motor 26 and the discharge port 27. The shafts of the spindle 23 and the pump 21 are interconnected by means of an eccentric clutch located inside the housing withdrawal.

Pump 21 is a volumetric type mechanism that allows the transfer of a three-phase mixture (oil, gas and water).

The outlet housing 22 is designed to supply the pumped liquid to the pump.

The spindle 23 is designed for the perception of axial and radial loads that occur during operation, including from the pressure of the pumped medium.

The propeller shaft 24 serves to transmit rotation from the shaft of the gearbox 25 to the shaft of the spindle 23, compensating for their mutual radial and angular displacement.

The purpose of the gearbox 25 is its use complete with a drive to change the torque and speed.

The motor 26 is designed to convert the supplied electrical energy into mechanical (creating torque) and drives the pump MF.GNK 2.

Receiving line 7 serves to supply the pumped medium (gas-liquid mixture) to the pump from the production well.

Pressure line 8 is designed for supplying the pumped medium (MHC) to the oil treatment installation.

The pumping system MFNU 2 works as follows.

The gas-liquid mixture from the production well through the supply pipeline enters through the branch pipe 22 into the suction cavity of the pump 21, where with the help of a rotating rotor located inside the stator, it is forced into the discharge nozzle 27. Then the HSG, receiving additional pressure from the pump 2, through pipeline line enters the oil treatment installation.

Thanks to this technical solution and the design of the pumping station, which incorporates a horizontal pumping complex (unit) based on multiphase and centrifugal pumps installed in one block-room, the equipment is protected from the effects of an aggressive external environment, a large temperature difference, a decrease in investment, a reduction the timing of the commissioning of new facilities and increased profitability.

In the absence of the need to isolate the machine room from the control units and the operator, the inexpediency of operating the pumping station in special insulated rooms, there are other ways to create favorable conditions for operating the equipment without building block boxes, this invention is allowed under a special canopy protecting the equipment and operating personnel from the effects of precipitation and other influences, as well as no overhang (for example, in the open air).

Claims (1)

CLAIM Pumping station containing one block-room with a horizontal multiphase pumping unit (MFNU) placed in it pumping a multicomponent medium from production wells, which includes a bulk-type pump, outlet housing, spindle, cardan shaft, gearbox, electric motor and discharge port placed on the mounting frame, and the connection of the shaft of the pump and the spindle is made by means of an eccentric coupling located inside the housing-outlet; management system of MFNU; receiving line for the supply of a multicomponent medium to the pump; an injection line for supplying a multi-component medium to an oil treatment installation; horizontal centrifugal pumping complex (GPC) pumping water - 3 031425 through the injection wells of the reservoir pressure maintenance systems in the productive formations, which includes a centrifugal pump, a receiving module or stop chamber, an electric motor and a multiplier placed on the mounting frame; control system of GNK; receiving and injection lines for supplying the pumped medium to the pump and supplying it to the injection well, respectively, containing valves, coarse and fine filters, check valve and flow meter; lifting device for the installation and dismantling of the GNK and IFNU; operator’s workplace.