RU167027U1 - DEVICE FOR DIVIDING OIL WELL PRODUCTS PRODUCT FLOW - Google Patents

Abstract

A device for dividing the flow of oil wells, containing a supply pipe with a mixer, an inlet cowl, calibrated tubes, two outlet pipes, characterized in that the calibrated tubes, one measuring tube and the remaining bypass tubes are made with a constricting device and are fixed at one end to the inlet cowl in the vertical position, and the bypass tubes at the other end are fixed in the output fairing connected to one outlet pipe, the measuring tube at the other end with It is connected through a control valve to another outlet pipe, and a differential pressure sensor is connected to one of the bypass tubes and to the measuring tube at the same distance from the end, the output of which is connected to the control valve through a control and control unit.

Description

The utility model relates to oil production and can be used to work as a part of measuring installations when measuring the mass of oil and the volume of oil gas.

A device for dividing the flow of oil production wells, containing the inlet pipe with a mixer, calibrated tube and inlet cowl, two outlet pipes (RF patent No. 39645).

The disadvantage of this device for dividing the flow of oil wells is the low accuracy of the division at different hydraulic resistances to the flow in the outlet pipelines.

The objective of the proposed technical solution is to increase the accuracy of dividing the gas-liquid flow of oil well products, by controlling the change in flow rate in the tubes

The technical result achieved by the implementation of the technical solution is to ensure high accuracy of dividing the gas-liquid flow of oil well products

The specified technical result is achieved by the fact that in the device for dividing the flow of oil wells containing a supply pipe with a mixer, an inlet cowl, calibrated pipes, two discharge pipes, calibrated pipes including one measuring pipe and the remaining bypass pipes, are made with a constriction device and fixed one end on the inlet cowl in an upright position, with the bypass tubes at the other end secured in the outlet cowl connected to one outlet pipe with a gadfly, a measuring tube, the other end is connected through an adjustable valve to another outlet pipe, and a differential pressure sensor is connected to one of the bypass tubes and to the measuring tube, at the same distance from the end, the output of which, through the control and control unit, is connected to an adjustable by crane.

The drawing shows a diagram of the device.

The device comprises a supply pipe 1 with a mixer 2, connected to the inlet fairing 3, in holes located around a circle at an equal distance from the center, which is calibrated at one end, calibrated tubes, of the same cross section and length, of the same material, in a vertical position. At the inlet of each calibrated tube, a constricting device 4 is placed. Part of the calibrated tubes is the bypass tubes 13, the other end is fixed in the openings of the outlet fairing 11 connected to the outlet pipe 12. One of the calibrated tubes is a measuring tube 5, the other end is connected through a regulating crane 9 (KP), which is connected to the control and control unit 7 (BKU), with a discharge pipe 8. The input of the control and control unit 7 is connected to the output of the differential pressure sensor 6 (DPD), the sensitive elements 10 of which first, are connected to one of the bypass tubes 13 and the measuring tube 5 at a predetermined distance h from the place of fastening of the ends of the calibrated tubes, with a constricting device 4 placed in the openings of the inlet fairing 3.

The device operates as follows.

The gas-liquid flow Qsk from an oil well (not shown) enters through the inlet pipe 1 with a mixer 2, where the flow is homogenized, and evenly, using the inlet fairing 3, is divided in proportion to the specified number of calibrated tubes, one measuring tube 5 and the remaining bypass 13, with narrowing devices 4.

One part of the gas-liquid stream, separated through the bypass tubes 13, is combined with the help of the outlet fairing 11 into one stream, which enters the discharge pipe 12, and then goes to the bypass pipe of the oil production measuring installation (not shown).

In all bypass tubes 13, when the gas-liquid flow moves in them, the pressure drop and the flow rate will be the same, since the output of the bypass tubes 13 will not change the flow parameters.

Another part of the gas-liquid stream passes through the measuring tube 5, an adjustable valve 9, and enters the discharge pipe 8, from which it is sent to the separator of the oil production measurement unit (not shown).

Since, at the output of the measuring tube 5, the hydraulic resistance to the flow can change due to changes in the flow parameters in the discharge pipe 12, connected for example to a separator of oil well production measurement units, the gas-liquid flow rate in the measuring tube 5 may differ from the bypass flow rate handsets 13.

The differential pressure sensor 6, the sensing elements 10 of which are connected at a predetermined distance h to one of the bypass tubes 13 and to the measuring tube 5, determine the value of the difference measured in them, the pressure of the gas-liquid flow.

In the case when a certain value of the difference in pressure of the gas-liquid flow measured in these tubes is not equal to zero, the control and control unit 7 generates a signal that drives an adjustable valve 9, providing at the output of the measuring tube 5 hydraulic resistance to flow, which will allow you to change the average speed flow through the measuring tube 5, so that the magnitude of the difference in the magnitude of the pressure flow in the tubes becomes equal to zero.

This ensures accurate division of the gas-liquid flow Q in proportion to the number of calibrated tubes, with the same volume flow in each calibrated tube

The volumetric flow rate of a gas-liquid stream through each calibrated device tube is determined by:

Where

K is a coefficient taking into account the compressibility of the gas and the relative motion of the liquid and gas phases of the gas-liquid flow,

α is the flow coefficient,

F is the cross-sectional area of the hole of the calibrated tube,

ρ _cm is the density of the gas-liquid flow,

ΔР _Tr - differential pressure flow in a calibrated tube.

When measuring at each moment of time for all calibrated tubes, the coefficients, K, α, as well as the values of ρ _cm and F remain constant.

Pressure drop in one of the bypass tubes

_{ΔР bp.tr} = Р-Р _bp.tr ,

Where:

P is the flow pressure at the inlet of one of the bypass tubes 13,

R _bp.tr is the flow pressure in one of the bypass tubes 13 at the point of pressure measurement at a distance h from the inlet of the tube.

Differential flow pressure in the measuring tube

_{ΔР from.tr} = Р-Р _from.tr ,

Where:

P is the flow pressure at the inlet of the measuring tube 5,

P _Iz.tr - flow pressure on the measuring tube 5 at the point of pressure measurement at a distance h from the inlet of the tube

The main condition for the exact division of the gas-liquid flow between one of the bypass tubes 13 and the measuring tube 5 is to ensure a zero value of the difference in flow pressure in the tubes, which is determined by the differential pressure sensor 6

ΔР ₀ = _{ΔР bp.tr} -ΔР _tr.iz = P _{bp.tr -R from.tr} = 0

Where:

ΔP ₀ is the difference in flow pressures in one of the bypass tubes and in the measuring tube.

To do this, regulate the average gas-liquid flow rate in the measuring tube 5 by the control valve 9, so as to equate the average flow rate in the measuring tube 5 to the average flow rate in the bypass tube 13.

The volumetric flow rate of a gas-liquid stream in each calibrated tube can be determined:

Q _TP = V _cp.tr · F _tr ,

Where:

V _cp.tr. - average gas-liquid flow rate through a calibrated tube.

F _Tr - the cross-sectional area of the holes of the calibrated tube

Thus, in the proposed device, the equality of the volume flow rate in each calibrated tube will be achieved due to the equality of the average velocity of the gas-liquid flow through each calibrated tube V _cp.tr, with the same values of the cross-sectional area of the hole of each calibrated tube F _Tr. that will allow for higher accuracy of the division of the gas-liquid flow than the prototype.

The proposed device as part of a device for measuring the production of oil wells will determine the volumetric flow rate of gas-liquid flow from the well:

Q _ck = _{nQ from tr}

Where:

Q _istr - the volumetric flow rate of gas-liquid flow in the measuring tube

n is the number of tubes.

The use of the proposed device in installations for measuring the production of oil wells will expand the range of measured flow rates of gas-liquid flows and reduce capital costs for their production.

Claims (1)

A device for dividing the flow of oil wells, containing a supply pipe with a mixer, an inlet cowl, calibrated tubes, two outlet pipes, characterized in that the calibrated tubes, one measuring tube and the remaining bypass tubes are made with a constricting device and are fixed at one end to the inlet cowl in the vertical position, and the bypass tubes at the other end are fixed in the output fairing connected to one outlet pipe, the measuring tube at the other end with It is connected through a control valve to another outlet pipe, and a differential pressure sensor is connected to one of the bypass tubes and to the measuring tube at the same distance from the end, the output of which is connected to the control valve through a control and control unit.

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