RU154443U1 - LIQUID AMOUNT COUNTER - RAW OIL - Google Patents

Abstract

A liquid quantity counter - crude oil, consisting of a casing, a measuring unit, an input and an output manifold, a separation unit, characterized in that the casing is a horizontally arranged cylindrical vessel, on whose shell perpendicular to the axis there are two coaxial openings for the input / output of the oil and gas mixture hermetically connected inlet and outlet headers, moreover, an adjustable inlet device is installed at the inlet, and a cover is attached to the body through the flange and measuring, and to make the connection leakproof, a rubber gasket is used, and on the inner end of the cover there are three threaded holes in which studs are installed that support the support, in addition, shock absorbers are installed on these axes, the movement of which is limited by the washer and cotter pin, and at the end of the cover and support there are coaxial holes with bearings and the axis of the measuring unit is installed in them, and the measuring unit is a movable system and consists of two prismatic buckets a triangular section and side plates to which the load is attached, and two permanent magnets are mounted on one of the plates, and holes for mounting electromagnetic sensors, a density sensor, handles and level are made on the outer end of the cover of the measuring unit, and holes for mounting electromagnetic sensors are made so that their center coincides with the trajectory of the permanent magnets of the measuring chamber, and the separation unit contains two ejectors mounted on the input and output collectors; nave

Description

The utility model relates to the field of measurement technology and can be used to measure the mass flow rate of crude oil and its components (oil, produced water).

Known devices and methods for measuring flow, for example: P. P. Kremlevsky. Flow meters and quantity counters. - Leningrad .: Engineering, 1975; Abramov G.S., Barychev A.V. Practical flow metering in the oil industry. - M .: VNIIOENG OJSC, 2002.

The disadvantages of these technical solutions is the large error of flow measurements, the complexity and large dimensions of the structures.

Closest to the proposed utility model of the counter is a mass flow meter, in which the mobile system consists of two triangular prismatic chambers mounted on the swing axis, and adjustable stops that change the angle of inclination of the two-chamber vessel in its original position. When filling with liquid, each chamber is oriented so that the center of gravity of the liquid mass moves along the bisector of the corner at the top of the isosceles triangle, which eliminates the error in the flow measurement caused by a change in the density of the liquid (P. P. Kremlevsky. Flow meters and quantity counters. - Leningrad .: Engineering , 1975;).

The disadvantages of the prototype are the large inaccuracy of flow measurements, the need to ensure the constancy of the frequency of receipt of the measured doses at different fluid flow rates, the complexity of the design, and the lack of automation of data collection. The purpose of the utility model is to increase reliability, maintain the accuracy of flow measurement regardless of the density of the medium being measured, simplify the design, maintenance and collection of information.

This goal is achieved by the fact that the counter of the amount of liquid - crude oil (hereinafter referred to as SKZh-SN) is a chamber-type device with tipping prismatic buckets and load balancers for tipping over a mass portion of liquid.

In FIG. 1 shows a general view of a counter for the amount of liquid crude oil; in FIG. 2 - case; in FIG. 3 - measuring unit.

SKZH-SN consists of the following main units: housing, measuring unit, input collector 3, output collector 4, separation unit.

The housing is a horizontally located cylindrical vessel, on the shell 1 of which, perpendicular to the axis, two coaxial openings are made for the inlet / outlet of the oil and gas mixture through hermetically connected inlet and outlet manifolds 3 and 4, respectively. Moreover, an adjustable input device 6 is installed at the inlet 6. The cover 11 of the measuring unit is attached to the housing through the flange 7 using the ring 8. To impart a seal to the joint, a gasket, for example made of rubber, is used. Three threaded holes are made on the inner end of the cover, into which the studs 2 are installed, which serve to fasten the support 12. In addition, shock absorbers 13 are installed on these axes, the movement of which is limited by the washer 14 and cotter pin 15. There are coaxial openings on the end of the cover and the support with bearings, they are installed axis 16 of the measuring unit.

The measuring unit is a movable system and consists of two prismatic buckets 17 of triangular section and side plates 18, to which the load 19 is attached, and one of the plates has two permanent magnets 20.

On the outer end of the cover of the measuring unit, holes are made for attaching electromagnetic sensors 21, density sensor 22, handles 23 and level 24. The holes for attaching electromagnetic sensors are made in such a way that their center coincides with the path of the permanent magnets of the measuring chamber.

The separation unit contains two ejectors 5 mounted on the input and output headers; oil and gas manifold 9, gas manifold 10, interconnecting ejectors and housing SKZH-SN; a damper 25 and a funnel 26 installed in the housing. The quencher is a perforated sheet.

The principle of operation of the utility model is based on alternately filling with crude oil one of the two prismatic buckets located in the measuring chamber with cargo balancing and their subsequent tipping over upon reaching a certain mass of liquid in them. The filling time of the measuring chambers determines the mass flow rate of the flowing fluid.

An input manifold and an adjustable input device are designed to enter the working fluid and its output.

The oil and gas mixture is fed into the inlet manifold, then through an adjustable inlet, damper and funnel into the measuring chamber, to fill one bucket of the measuring chamber to a value (in mass units), leading to a change in the condition of stable equilibrium due to the position of the center of mass of the buckets in the measuring chamber, leads to the rotation of the measuring chamber and the discharge of liquid from the bucket into the housing SKZH-SN. This process is then repeated on the second camera bucket. At the same time, liquid located in the lower part of the housing is displaced into the output manifold.

A prerequisite for operation in a closed collection system (under overpressure) is the presence of gas in the SKZh-SN housing, which is released from the oil and gas mixture when passing through the elements of the separation unit (damper, funnel) due to the effect of gravitational separation. In addition, this unit serves to exclude the action of a shock wave on buckets and achieve a static loading mode of the mixture. The excess of released gas through the gas collector enters the ejector, then into the output manifold. In addition, to avoid a critical increase in pressure inside the housing, part of the oil and gas mixture is released through the oil and gas manifold into the ejector and enters the inlet manifold.

When the permanent magnet axis passes through the axis of the electromagnetic sensor, the last electric pulse is formed, fixed by the calculator and the countdown starts, which stops after the axis has re-entered the magnet after filling the bucket.

Indications of the mass of liquid and flow rate are displayed on the indicator, and are also recorded and stored for a certain time in the archive. In addition, it is possible to transfer a normalized impulse to a telemetry system:

- the density of crude oil and its components under operating conditions;

- volume and volumetric flow rate of crude oil under operating conditions;

- mass and mass flow rate of crude oil under operating conditions;

- mass and mass flow rate of crude oil excluding water under operating conditions;

- the volume and volumetric flow rate of crude oil excluding water under operating conditions;

- volume and volumetric flow rate of free gas in crude oil under operating conditions;

- bringing the calculated values of the volume and volumetric flow rate of crude oil, crude oil excluding water and free gas to standard conditions.

When the data on the content of solids and chloride salts in crude oil is entered into the BV, according to the results of studies of the crude oil sample in the HAL, SKZh-SN has the ability to calculate the net oil mass, as well as adjust the net mass of crude oil taking into account the estimate of the amount of crude oil dissolved in it gas.

The dielcometric method (GOST 14203) was chosen as the method for measuring the moisture content of crude oil, which is based on measuring the equivalent dielectric constant of a gas-liquid mixture using a high-frequency electric field created between the electrodes of a capacitive sensor.

% W = f (ε; D0, ℓ; F)

Where:

% W is the percentage of water in the gas-liquid mixture;

ε is the dielectric constant of the liquid;

D0, ℓ - geometric dimensions of the sensor;

F is the frequency of the electric field;

The principle of operation of the converters is to convert non-electrical quantities (pressure, temperature, physical properties of the medium to be measured) into electrical signals, in proportion to the change in non-electrical quantities.

The mass flow rate of crude oil is calculated by the formula:

Qмwn = (nimк) / t

Where:

Qm is the mass flow rate of crude oil (liquid phase) of the oil and gas mixture;

ni is the number of tipping over buckets;

mk is the mass of crude oil in the ladle (liquid phase);

t is the time of mass flow measurement.

The mass flow rate of oil is calculated by the formula:

Qmn = f [Qmwn (1-% W)

The mass flow rate of produced water is calculated by the formula:

Qmn = f [Qmwn (% W)

The list of used literature:

1. P.P. Kremlin. Flow meters and quantity counters. - Leningrad .: Mechanical engineering, 1975. With 366-371;

2. Abramov G.S., Barychev A.V. Practical flow metering in the oil industry. - M .: VNIIOENG OJSC, 2002. From 361-363.

Claims (1)

A liquid quantity counter - crude oil, consisting of a casing, a measuring unit, an input and an output manifold, a separation unit, characterized in that the casing is a horizontally arranged cylindrical vessel, on whose shell perpendicular to the axis there are two coaxial openings for the input / output of the oil and gas mixture hermetically connected inlet and outlet headers, moreover, an adjustable inlet device is installed at the inlet, and a cover is attached to the body through the flange and measuring, and to make the connection leakproof, a rubber gasket is used, and on the inner end of the cover there are three threaded holes in which studs are installed that support the support, in addition, shock absorbers are installed on these axes, the movement of which is limited by the washer and cotter pin, and at the end of the cover and support there are coaxial holes with bearings and the axis of the measuring unit is installed in them, and the measuring unit is a movable system and consists of two prismatic buckets a triangular section and side plates to which the load is attached, and two permanent magnets are mounted on one of the plates, and holes for mounting electromagnetic sensors, a density sensor, handles and level are made on the outer end of the cover of the measuring unit, and holes for mounting electromagnetic sensors are made so that their center coincides with the trajectory of the permanent magnets of the measuring chamber, and the separation unit contains two ejectors mounted on the input and output collectors; oil and gas manifold, gas manifold, interconnected ejectors and the body of the meter for the amount of liquid - crude oil; a damper and funnel mounted in the housing, and the damper is a perforated sheet.

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