RU2748173C1 - System for collecting and transporting oil well products - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, namely to field equipment for collecting and transporting oil well products. The system includes a collection pipeline running from the production wells through group metering units, a pressure pipeline to the oil treatment unit with a separation unit through a booster pumping station, an ejector placed between the collection pipeline connected to the low-pressure chamber of the ejector and the pressure pipeline connected to the outlet of the ejector. The inlet of the ejector is equipped with a pressure line for water supply, which is connected to the reservoir pressure maintenance system by means of a comb for sampling part of the water going to the injection wells. To maintain the operation of the ejector within the maximum efficiency, the collection pipeline can be additionally equipped with a pressure sensor at the inlet to the ejector, equipped with a bypass pipeline with an adjustable gate valve, controlled by a control unit depending on the data from the pressure sensor. To control the water content of the pumped products before and after the ejector, the collection and pressure pipelines can be additionally equipped with appropriate samplers.

EFFECT: proposed system is simple and reliable and allows it to be operated in remote fields by using water partially taken from the reservoir pressure maintenance system for pumping through the ejector.

3 cl, 1 dwg

Description

The invention relates to the oil and gas industry, in particular to field equipment for collecting and transporting oil well products.

A known system for collecting and transporting oil well products (patent for PM RU No. 135390, IPC F17D 1/00, F04F 5/54, publ. 10.12.2013 Bul. No. 34), including a network of prefabricated pipelines of wells, a pipeline for supplying oil wells, an ejector, a separation unit connected to it with a separation product discharge line to a power unit located in a pit and including a submersible electric motor, an electric centrifugal pump and tubing tubing connected in series from bottom to top, the inner cavity of which is hydraulically connected to the ejector, and the pipeline for supplying oil products wells additionally contains a gas pre-sampling unit, which is equipped with a line for withdrawing the separated gas and a line for removing degassed borehole fluid, while the ejector is made in the form of a two-stage jet apparatus, the first stage of which consists of a water-liquid pump consisting of a nozzle, a receiving chamber and a mixing chamber, the second stage - from gas dc pump, consisting of a nozzle connected to a mixing chamber of a water-liquid pump, a receiving chamber, a mixing chamber and a diffuser, and the line for removing the separated gas from the gas pre-selection unit is connected to the receiving chamber of the gas-liquid pump, and the line for removing the degassed well fluid is connected to the receiving chamber of the water-liquid pump, which in turn is hydraulically connected to the well tubing cavity through the nozzle of this pump, while as a separation unit the system contains an oil and gas separator with water discharge, made with the possibility of dividing the fluid flow entering it from the outlet of the second stage of the jet pump into a gas-oil mixture, discharged to the transport pipeline, and to the separated water with a low oil content, discharged to the power unit.

The closest in technical essence is the system for collecting and transporting oil wells production (patent RU No. 2236639, IPC F17D 1/00, publ. 09.20.2004 Bul. No. 26), including a network of collecting pipelines from wells, a pressure pipeline to an oil treatment unit, an ejector and a pump fixed to the tubing and located in a sump, which is equipped with a pipe with a plug at the lower end and wellhead equipment at the upper end, a sump annulus outlet and a linear outlet of wellhead equipment communicating with the inner cavity of the tubing, and the system is additionally equipped with a separation unit with outlets for gas-oil and water-oil separation products, the ejector is located between the network of collecting pipelines and the pressure pipeline, while the pipe for entering the transported liquid into the ejector is connected to the network of collecting pipelines, the ejector nozzle is connected to the pumping cavity through the linear outlet of the wellhead equipment. to pressure pipe, and the ejector diffuser - with the inlet of the separation plant, the outlet of the gas-oil separation product is connected to the pressure pipeline, and the outlet of the oil-water separation product is connected by means of a bypass pipeline with the outlet of the annular space of the sump, while the system contains an electric centrifugal pump as a pump.

The disadvantages of both systems are the complexity of implementation and low reliability, since it is necessary to have a technological well with underground injection equipment directly in the oil gathering zone for pumping water through the ejector and separators for separating water after the ejector and re-injecting it into the technological well, as well as a narrow field of application from - due to the impossibility of using it in remote fields, since it is impossible to constantly monitor the operation of a technological well and a separator.

The technical objective of the present invention is to create a simple and reliable system for collecting and transporting oil well products, allowing it to be operated in remote fields by using water for pumping through the ejector, partially taken from the reservoir pressure maintenance system (RPM).

The technical problem is solved by a system for collecting and transporting oil well products, including a collecting pipeline from production wells, a pressure pipeline to an oil treatment plant with a separation unit, an ejector located between the collecting pipeline connected to the low-pressure chamber of the ejector and a pressure pipeline connected to the outlet from ejector, while the ejector inlet is equipped with a pressure line for water supply.

The novelty is that the pressure line is connected to the reservoir pressure maintenance system to extract part of the water going to the injection wells.

It is also new that the collecting pipeline is additionally equipped with a pressure sensor at the inlet to the ejector, equipped with a bypass pipeline with an adjustable valve controlled by the control unit depending on the data from the pressure sensor of the collecting pipeline to maintain the ejector operation within the maximum efficiency.

It is also new that the collection and discharge pipelines are equipped with appropriate samplers to control the water cut of the pumped product.

The drawing shows a diagram of the system.

The system for collecting and transporting oil well products includes a collecting pipeline 1 running from production wells 2 through group metering units (GDU) 3, a pressure pipeline 4 to an oil treatment unit (OTP) with a separation unit (not shown) through a booster pumping station (BPS) 5, the ejector 6, located between the collection pipeline 1, communicated with the low pressure chamber 7 of the ejector 6, and the pressure pipeline 4, communicated with the outlet from the ejector 6. The inlet of the ejector 6 is equipped for water supply with a pressure line 8, which is connected to the pressure maintenance system (not shown) with the help of a comb 9 for taking a part of the water going to the injection wells 10. To maintain the operation of the ejector 6 within the maximum efficiency (the optimal operating parameters, at which the pumps have the maximum efficiency - efficiency, are indicated in the passport of the jet pump - ejector 6 ) collecting pipeline 1 can be additionally equipped with a pressure sensor 11 at the inlet to the ejector 6, supplying connected by a bypass pipeline 12 with an adjustable valve 13 controlled by a control unit 14 depending on the data from a pressure sensor 11. To control the water content of the pumped product before and after the ejector 6, the collection 1 and pressure 4 pipelines can be additionally equipped with appropriate samplers 15 and 16.

Structural elements and technological connections that do not affect the system's performance are not shown in the drawing or are shown conditionally.

The system works as follows.

At an oil-bearing area remote from the OTP with injection 10 and production 2 wells, respectively, a pressure maintenance system with a comb 9 and a production collection system consisting of a gas control unit 3 and a collection pipeline 1, which is connected to the low pressure chamber 7 of the ejector 6. The pressure line 8 of the ejector 6 is connected to comb 9, and the outlet - by pressure pipeline 4, which sends the products of production wells 2 using BPS 5 to the OTP with a separator unit for separating water from oil and gas.

If long autonomous operation is required (a month or more) without setting and maintaining the ejector 6, it is equipped with a bypass pipeline 12 with an adjustable valve 13 controlled by the control unit 14 to maintain the operation of the ejector 6 within the maximum efficiency in the interval between the next services.

For a more objective control over the water cut of production wells 2 before and after the ejector 6, the collection 1 and pressure 4 pipelines can be additionally equipped with appropriate samplers 15 and 16, the readings of which are taken into account when calculating the oil produced and the water cut of the product.

After installing all the necessary elements of the system, the selection of products by deep pumps (not shown) from the production wells 2 begins, and water is supplied through the pressure maintenance system to injection wells 10, and part of the water from the comb 9 is taken through the pressure line 8 to the inlet of the ejector 6. The flow of the sampled water passing at a high speed, creates a low pressure in the chamber 7 of the ejector 6, which is transmitted through the collecting pipeline 1 and the GZU 3 to the wellheads of the production wells 2, significantly reducing the load on the deep pumps of the corresponding wells 2, which facilitates the operation of these pumps and increases their service life especially in deep production wells 2 and wells 2 producing viscous oil (more than 200 mPa • s). As practice has shown, the overhaul period of these pumps has more than doubled. Water from the reservoir pressure maintenance system and the production of wells 2 are mixed in the chamber 7 of the ejector 6 and through the pressure pipeline 4 with the help of the BPS 5 is sent to the OTP. Water-cut control of well 2 production can also be carried out using samplers 15 and 16.

In the presence of a bypass pipeline 12 with an adjustable valve 13, the vacuum in the chamber 7 of the ejector 6 is constantly regulated throughout the entire period of operation. Based on the readings of the sensors 11, the control unit 14 adjusts the amount of closing or opening of the corresponding valve 13 on the bypass pipeline 12 to adjust the amount of vacuum in the chamber 7 of the ejector 6 and obtain the optimal pressure in the collecting pipeline 1.

The control unit 14 can be hydraulic, electronic, mechanical, or the like. The authors do not pretend to the appearance and method of operation of the control unit 14 (in practice, in the RT, they give more preference to electronic control units 14)

In the hydraulic control unit 14, when the pressure in the sensor 11 rises, this pressure is supplied by a system of pipes (not shown) to the unit 14, where, by means of communicating pistons, the force is transmitted to the valve 13 and closes it. As a result, more liquid from the pressure line 8 is directed to the ejector 6, its speed increases and a greater vacuum is created in the chamber 7, which reduces the pressure in the collection line 1 to the optimum for the ejector 6. When the pressure in the sensor 11 decreases, the reverse processes occur: the valve 13 opens slightly , more liquid from the pressure line 8 is directed to the bypass pipeline 12, and the speed in the chamber 7 decreases along with the discharge, which ensures an increase in the pressure in the collection pipeline 1 to the optimum for the ejector 6.

In the electronic control unit 14, when the pressure in the sensor 11 rises, the signal is fed via wires (not shown) to the unit 14, where it is compared with the reference one and, if it does not match, is transmitted to the valve 13 and closes it. As a result, more liquid from the pressure line 8 is directed to the ejector 6, its speed increases and a greater vacuum is created in the chamber 7, which reduces the pressure in the collection line 1 to the optimum for the ejector 6. When the pressure in the sensor 11 decreases, reverse processes occur: the valve 13 opens slightly, more liquid from the pressure line 8 is directed to the bypass pipeline 12, and the speed in the chamber 7 decreases along with the discharge, which ensures an increase in the pressure in the collection pipeline 1 to the optimum for the ejector 6.

In the mechanical control unit 14, when the pressure in the sensor 11 rises, this pressure is supplied by a system of pipes (not shown) to the unit 14, where, using a system of levers from the piston (not shown), the force is transmitted to the valve 13 and closes it. As a result, more liquid from the pressure line 8 is directed to the ejector 6, its speed increases and a greater vacuum is created in the chamber 7, which reduces the pressure in the collection line 1 to the optimum for the ejector 6. When the pressure in the sensor 11 decreases, the reverse processes occur: the valve 13 opens slightly , more liquid from the pressure line 8 is directed to the bypass pipeline 8, and the speed in the chamber 7 decreases along with the discharge, which ensures an increase in the pressure in the collection pipeline 1 to the optimum for the ejector 6.

Since the entire system is located on the surface without the use of technological wells and a separation unit in the oil-bearing area, its design, as well as installation at the oil site and maintenance, is greatly simplified, while reliability is increased due to the simplification.

The proposed system for collecting and transporting oil well products is simple and reliable and allows it to be operated in remote fields due to the use of water for pumping through the ejector, partially taken from the reservoir pressure maintenance system.

Claims (3)

1. A system for collecting and transporting oil products, including a collection pipeline from production wells, a pressure pipeline to an oil treatment plant with a separation unit, an ejector located between the collection pipeline connected to the low-pressure chamber of the ejector and a pressure pipeline connected to the outlet from the ejector , while the inlet of the ejector is equipped with a pressure line for supplying water, characterized in that the pressure line is connected to the reservoir pressure maintenance system to take a part of the water going to the injection wells. 2. The system for collecting and transporting oil well products according to claim 1, characterized in that the collecting pipeline is additionally equipped with a pressure sensor at the inlet to the ejector, equipped with a bypass pipeline with an adjustable valve controlled by the control unit, depending on the data from the pressure sensor of the collecting pipeline to maintain work of the ejector within the limits of maximum efficiency. 3. The system for collecting and transporting oil well products according to one of claims 1 or 2, characterized in that the collection and pressure pipelines are equipped with appropriate samplers to control the water cut of the pumped product.

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