SU759712A1 - Deep well flow meter - Google Patents

Description

The invention relates to hydrodynamic studies of oil wells, and more specifically to flow measurement.

Known downhole flowmeter including a housing, the transducer, the measuring element in the form of a strengthening crosspiece ₅ lennymi hemispheres at its ends facing one convexity in the direction [1].

The flowmeter is designed to determine the flow rate in oil and gas wells and highlight the boundaries of the working part of the reservoir, but its measuring element responds only to radial flow directed to one side, while in real well conditions fluid flow can be directed from all sides depending on the nature of the perforation).

Also known depth meter - ¹⁵ flowmeter, comprising a housing with inlet and outlet windows, a packer, a sensitive element in the form of an impeller placed on an axis, and a transducer [2].

With the packer open, all liquid flows through the channel of the housing where the turbine-type measuring unit is located and rotates the turbine. Turbine rotational motion with a magnet and magni2

The controlled contact is converted into an electrical signal and transmitted via wireline to the surface.

But this flowmeter-flowmeter is intended only to determine the total flow rate (flow rate) of the axial fluid flow in the column and therefore has a low sensitivity to the radial component of this flow, the value of which in some cases may be small.

The purpose of the invention is to increase the sensitivity when measuring radial flows.

This goal is achieved by the fact that the device is mounted on the same axis with the first additional turbine, and the turbine have oppositely directed blades, and on the case between them made an additional input window.

In order to improve measurement accuracy with small radial flows, it is equipped with an additional packer, with one of the packers located between the input windows and the other between the output and additional input windows.

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The drawing shows schematically a depth flowmeter flow meter.

It consists of a housing 1, in which there is an exit window 2, an additional input window 3, an input window 4, an axis 5 on which two identical, oppositely directed turbines 6 and 7 are fixed, with the impeller 6 located between windows 2 and 3, and ^h impeller 7 - between the windows 3 and 4.

Axis 5, together with the turbines 6 and 7, can rotate freely on agate thrust bearings 8 and 9. On axis 5, a permanent magnet 10 is asymmetrically fixed, and a packer is mounted on the holder of an agate thrust bearing 8. 12, and between the additional input window 3 and the input window 4 a packer 13 is installed.

The flow meter works as follows.

Since the impellers are the same and oppositely directed, they will not rotate from the axial flow. The turbines also do not rotate when the flowmeter-flowmeter is pulled along the wellbore, which makes it possible to measure the radial flow and when the flowmeter-debtor is drawn along the well axis.

When the additional inlet window 3 hits the portion of the wellbore where there is a radial fluid flow, the impeller 6 is affected by the radial flow, and the influence of the axial flow acting simultaneously on both oppositely directed turbines is compensated.

A permanent magnet mounted on an axis during rotation, controlling a magnetically controlled contact, converts the number of the obor759712

four

mouths of turbine in pulses of electric current. The frequency of the pulses is proportional to the flow rate of the radial fluid flow. This signal is transmitted through the wireline to the surface.

₅ With small radial flows, it is possible to increase the sensitivity of the flow meter with the help of two remotely controlled packers directing the entire radial flow to the upper turbine.

Claims (2)

Claim 1. Depth flowmeter-flow meter, comprising a housing with inlet and outlet windows, a packer, a sensitive element in the form of an impeller placed on an axis and a transducer, characterized in that, in order to increase the sensitivity when measuring radial flows, it is equipped with first additional 20 by the impeller, the impellers having oppositely directed blades, and an additional input window is made on the body between them. 2. Depth flowmeter debitomer on π. 1, characterized in that, in order povy ²⁵ sheniya measurement accuracy at small radial flow, it is provided with an additional packer, wherein one of the packers is located between the input windows and the other - between the output and an additional ₃₀ entrance window.