RU153785U1 - Borehole Ultrasonic Flow Meter - Google Patents

Abstract

A borehole ultrasonic flow meter containing a flowing part from straight cylindrical pipe segments connected in series with each other, in which acoustic transducers are installed, an electronic signal processing unit, characterized in that it is mounted on the pipe by means of a thread, the body of the flowing part is made thick-walled and serves simultaneously as a body for electronic unit, the flow part is made of two separated by a gap between removable rectilinear cylindrical sections with an outer p a thread, in the inner end of which the outer part of the end cover is installed, one acoustic transducer is installed, near which openings are made on the lateral surface of the straight sections for the inlet / outlet of the working medium.

Description

Downhole Ultrasonic Flowmeter

The utility model relates to the field of measuring tools for measuring flow and can be used to account for the volume of water in a water well and injection pressure systems injected into injection reservoirs, as well as for accounting for the volume of oil extracted from reservoirs.

Known borehole ultrasonic flow meter, presented in C. No. 20071400689 by class G01F 1/66, c. 11/06/07, op. 05/20/09.

A known flow meter for determining the volumetric and / or mass flow rate of a multicomponent medium in an oil well containing an emitter configured to transmit ultrasonic measuring signals, and at least two transducers configured to receive ultrasonic measuring signals transmitted through or against the flow of the medium to be measured, and offset relative to each other along the pipeline, the control unit and / or processing, made with the possibility of determining volumetric and / or mass Flow rate of the medium, and characterized in that the emitter and the transducers are in the form of rings having a continuous acoustic contact along the entire perimeter.

Since application No. 2007140689 did not become a patent, and the brief publication of its formula does not give a complete picture of the design and the possibility of comparing it in more detail with the claimed technical solution.

Known ultrasonic flow meter for wells, described in p. RF No. 85638 class. G01F 1/74, 1/66, c. 03/18/09, op. 08/10/09. and selected as a prototype ..

According to the formula of clause RF No. 85638, a well-known downhole flowmeter is made as follows.

"one. An ultrasonic flowmeter of components of a multiphase medium in a pipeline containing two flow rate changing elements, representing two pipe sections of different diameters connected in series, each pipe section contains an ultrasonic flow rate conversion unit for determining the real gas velocity of a multicomponent medium based on the Doppler effect, an ultrasonic conversion unit volumetric gas concentration to determine the actual gas concentration; ultrasonic volume conversion unit th concentration of the liquid components of the multiphase medium, an electronic calculator of the parameters of the multiphase medium flow: temperature, pressure, oil, gas and water flow, characterized in that the ultrasonic unit for converting the volume concentration of the liquid components of the multiphase medium together with the additionally entered temperature and pressure sensors are placed in the additionally entered the third pipe segment, which is installed at the outlet of the second pipe segment having a smaller diameter than the first and third pipe segments and connected to neither and through the tapered portion.

2. The ultrasonic flow meter according to claim 1, characterized in that a second ultrasonic unit for converting the volume concentration of the liquid components of the multiphase medium is additionally introduced into the third pipe section, while one of them measures the concentration of the liquid phase in the center of the third pipe segment, and the second one pipe wall.

3. The ultrasonic flow meter according to paragraphs. 1 and 2, characterized in that the unit is additionally introduced a block of the current time value. "

This flow meter is characterized by high measurement accuracy and allows you to reliably measure the parameters of the controlled flow.

However, the disadvantage of the known flow meter is its complexity due to the flow part of three pipe sections of different diameters, their conical connection to each other, and the presence of three separate ultrasonic transducers in two of them (flow velocity, volumetric gas concentration, volumetric concentration liquid components), which complicates the circuit and reduces its maintainability. In this case, the electronic unit is located in a separate housing, as “The output signals from the output of all ultrasonic transducers are digitally encoded and, upon request of the electronic calculator 12, via the communication line 11, they enter the electronic calculator 12 of the multicomponent medium flow parameters - temperature, pressure, oil, gas and water flow. Coded values are received from temperature sensors 9 and pressure 10 located in the third pipe segment 3 ”, which increases the dimensions of the sensor, despite the fact that compact dimensions are a critical characteristic for downhole equipment.

Since the measurement data from each ultrasonic unit is involved in the calculation of the flow rate, failure of any of the six units will lead to a malfunction of the flowmeter. Thus, the reliability of this flow meter is lower compared to the claimed solution, where only one pair of ultrasonic transducers is used.

Thus, the complexity of the design reduces its reliability, in particular, its components such as failure-free operation and maintainability. In addition, the known flowmeter, having more than the claimed number of similar parts (three pipes of different diameters in the flow part, seven ultrasonic transducers, an electronic unit in a separate housing), clearly has very significant dimensions.

In accordance with the foregoing task of the proposed technical solution is to simplify the design while reducing the size and increase reliability by increasing the reliability and maintainability of the flow meter.

The problem is solved in that the borehole ultrasonic flowmeter containing a flowing part of straight cylindrical pipe segments connected in series with each other, in which acoustic transducers, an electronic signal processing unit are installed, ACCORDING TO THE USEFUL MODEL, is mounted on the pipe using thread, the body of the flowing part is made thick-walled and serves simultaneously as a housing for the electronic unit, the flow part is made of two removable rectilinear interconnected by a gap cylindrical sections with an external thread, in the inner end end of which is closed by a lid, one acoustic transducer is installed, near which openings for the inlet / outlet of the working medium are made on the lateral surface of the rectilinear sections.

The execution of the body of the flowing part is thick-walled and its use for placing an electronic unit in it in conjunction with the implementation of the flow-through assembly of two removable rectilinear cylindrical sections separated by a gap with an external thread, in the inner cover that is closed on the outside, the end part of which has one acoustic transducer, near which the input / output openings of the working medium are made on the side walls of the straight sections, simplifies its design, makes it possible to reduce ii flowmeter dimensions make it very strong and reliable, which is complemented by a threaded fastening to the tube of the flowmeter, providing the ability to withstand high external pressure to which it is subjected when installed in the wellbore when it is installed at a depth of 3 km or more. The threaded fastening of the flowmeter to the pipe simplifies its repair, and the execution of rectilinear cylindrical sections of the flowing part removable with an external thread and the end cover closed on the outside makes it possible to change only the removable sections when the flowing part is dirty, and not the entire flowmeter, simplifying the operation of the device.

The technical result is a simplification of the design while reducing the dimensions, ensuring the necessary strength and reliability, ensuring maintainability.

The inventive borehole flow meter has a novelty in comparison with the prototype, differing from it by such significant features as the installation of the flow meter on the pipe using a threaded connection, the execution of the body of the flowing part thick-walled and its use as a housing for the electronic unit, the execution of the flow part of two separated from each other a gap of removable rectilinear cylindrical sections, placement in the inner end of the rectilinear sections, one that is closed on the outside, by one acoustic transducer performance near the last input / output openings of the working medium on the side surface of straight sections, providing a plurality of achieving the desired result.

The inventive ultrasonic flow meter can be widely used in the oil industry for measuring the volumetric flow rate of oil from wells, water injected into the reservoirs, and therefore meets the criterion of "industrial applicability".

The utility model is illustrated by drawings, on which are presented on:

- FIG. 1 - general view of the assembled flow meter;

- FIG. 2 is a longitudinal sectional view of the assembled flowmeter.

- FIG. 3 - a straight section in longitudinal section.

- FIG. 4 is a cross-sectional view of the assembled flow meter in the center of the flow part.

The inventive borehole ultrasonic flow meter (Fig. 1-4) contains a flow part 1 located in a thick-walled body 2, and an electronic unit 3 located in the same body 2. The flow part 1 is made of removable rectilinear cylindrical sections 5 separated by a gap 4, made with external thread. In the housing 2, an internal thread is made for straight sections 5, which are screwed into it. At the end of each straight section 5 is a node 6 of the Converter. The transducer assembly 6 consists of an acoustic transducer 7 (Fig. 3) installed in a glass 8 and tightened with a nut 9 in it, and a cap 10 is screwed onto the end of the straight portion 5 from the outside. 10 On the side surface of the straight portion 5, holes 11 are located for the acoustic transducer 7 input / output of the measured medium.

Under the wires (not shown) from the acoustic transducers 7 in straight sections 5 channels 12 are made, and in the housing 2 - channel 13, which goes into the compartment of the electronic unit 3. The flow meter is installed on the pipe using thread 14.

The electronic unit 3 and the body 2 of the flowmeter are designed to operate at an ambient pressure of up to 50 MPa, in the range of ambient temperatures of -20 - +100 C. This is achieved by the use of reliable connections of parts of the body 2 and the use of electronic elements that are resistant to high temperature.

Dust and moisture protection is achieved by using sealing rubber rings (not shown in the drawings).

In the process of immersion of the flowmeter into the well, it can be subjected to mechanical stresses, therefore, its body 2 is thick-walled and has a heavy-duty and shock-resistant design and has a mechanical design group M34. Impact resistance is ensured by the large thickness of the walls of the housing 2, as well as reliable fastenings of the nodes and elements of the flow meter. In this case, the body 2 of the flow part 1 is a cylinder with a through cylindrical bore hole 15 displaced relative to the central longitudinal axis.

The operation of the ultrasonic flow meter is as follows.

In the electronic unit 3, electrical pulses are generated, which are alternately supplied to the acoustic transducers 7. The acoustic transducers 7 operate alternately as transmitters and receivers. When an electric pulse arrives at the transducer 7, the latter generates an ultrasonic signal, which is transmitted through the membrane to the liquid and, after a certain time, acts on the opposite transducer 7.

When the fluid moves, the ultrasonic wave drifts, which leads to a change in the propagation time of the ultrasonic signal: the flow time decreases along the fluid flow, and increases against the flow. The difference in the transit times of the ultrasonic signal through the liquid in and against the flow is proportional to the flow velocity and, therefore, to the volumetric flow rate.

In comparison with the prototype of the inventive downhole ultrasonic flow meter has a simpler design, smaller dimensions, and more reliable in operation.

Claims (1)

A borehole ultrasonic flow meter containing a flowing part from straight cylindrical pipe segments connected in series with each other, in which acoustic transducers are installed, an electronic signal processing unit, characterized in that it is mounted on the pipe by means of a thread, the body of the flowing part is made thick-walled and serves simultaneously as a body for electronic unit, the flow part is made of two separated by a gap between removable rectilinear cylindrical sections with an outer p a thread, in the inner end of which the outer part of the end cover is installed, one acoustic transducer is installed, near which openings are made on the lateral surface of the straight sections for the inlet / outlet of the working medium.

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