Device for detecting obstruction positions in operation column

FIELD: oil and gas extractive industry.

SUBSTANCE: device has body with ports in lower and upper ends, main sensitive elements in form of turbines and packing elements, placed in pairs at body ends, side port made in body between main sensitive elements and converter, connected to surface equipment. In side pipe, mounted inside the body between main sensitive elements, additional sensitive element is placed in form of turbine and thermal sensor. Lower end of side pipe is connected to side port. Diameter of turbine of additional sensitive element is less than diameter of turbines of main sensitive elements. Converter is a control block mounted above body including sleeves locator and electronic microprocessor device.

EFFECT: higher precision.

1 dwg

 

The invention relates to the oil and gas industry and can be used to identify irregularities in the production string in oil and gas wells.

A device for determining the intervals of the inflow of fluids into the well containing hollow with holes in the top and side parts of the housing mounted on the casing packers and the indicator stream. The device is provided with a tube placed in the body cavity of the annular gap between them, and on the ends of the pipe movably in the axial direction is set photocopiable stub [1]. The described device is the closest to the essential features of the claimed device.

The drawbacks:

the depression created by the device in megaceros zone is negligibly small, which will allow not only to register the flow, but to call it;

- the design complexity and greater intensity.

It is known device, comprising a housing with Windows in the lower and upper ends, the main sensitive elements in the form of impellers and pokerwise elements placed in pairs at the ends of the casing, the side window made in the housing between the main sensor, and a transducer connected to surface equipment [2].

Significant disadvantages of the device are:

- nevoso the ability to perform the impellers are absolutely identical in their geometric characteristics, which leads to constant rotation and distortion of all of the testimony;

- large inertia of the system, consisting of two impellers with a total length axis, which does not allow to record the position with a very small flow rate.

Object of the invention is a device having a high degree of accuracy in detecting violations.

This problem is solved by the proposed device, comprising a housing with Windows in the lower and upper ends, the main sensitive elements in the form of impellers and pokerwise elements placed in pairs at the ends of the casing, the side window made in the housing between the main sensor, and a transducer connected to the surface equipment.

What's new is that the device is equipped with an additional sensor element in the form of an impeller located in the side tube installed inside the housing between the main sensitive elements, the lower end of which is connected with a side window, and the diameter of the impeller additional sensing element is less than the diameter of the impellers of the basic sensing elements; equipped with a temperature sensor installed in the side tube, and the Converter is a control unit, mounted on the housing, comprising a locator and an electronic microprocessor-based device.

On the line is e shows the proposed device in longitudinal section.

The device consists of a body 1, a pipe with a diameter of 80 mm and a length of 1.5 m from the bottom 2 and top 3 Windows. Inside the main sensitive elements 4 and 5 in the form of impellers with vanes in one direction, and from the outside - pokerwise elements 6 and 7. Between the elements 4 and 5 are side tube 8 connected to the side window 9 in the housing 1. Inside the tube 8 is extra sensitive element 10 in the form of an impeller with a diameter less than the diameter of the impellers sensitive elements 4 and 5. Inside the tube 8 is also installed sensor 11. From the upper part of the body is connected to the control unit 12 includes a locator and an electronic microprocessor unit for processing signals from the sensor elements and the sensor, and transmitting these data to ground-based equipment (not shown) on single-core logging cable with a diameter of 8 mm Locator is designed to bind the position of the device in depth and has a range of values from 0 to 255, the signal-to-noise ratio = 3:1. Transfer data encoding Manchester 2. Ground equipment provides power to the control unit 12. receives and processes data from the line, transmits the received data to a personal computer. To determine the depth of the device used, the depth sensor DP 10/50 and counter p is the position of the speed of the CPS-3. The signal from the depth sensor is processed with regard to step one pulse counter and enters the personal computer. To compensate for the error of measurement depth (due to slippage of the cable relative to the measuring roller can be used magnetic sensor labels DMM-2M, which is connected to the counter PCA-3. The counter can adjust the depth according to magnetic marks or to transmit a signal to the computer without adjusting the depth.

The device operates as follows.

The device on the cable is lowered into the well to the bottom, then start to inject water under pressure, and then lift the device according to the column with a speed of up to 1200 m/H. If there are no disturbances in the production string, then all the liquid passes through the impeller main sensitive elements 4 and 5, with the speed of their rotation will be the same. When there is a breach in the column occurs, the fluid flow in megaceros space. In this case, the fluid flow in the incoming and outgoing cavities of the body will be different, resulting in the rotation speed of the impellers of the basic sensing elements 4 and 5 will be different. This will create a fluid flow through the side tube 8, which will record additional sensor element 10 and the sensor 11. Due to the fact that the data from all sensors come in to the computer at the same time, eliminates the error associated with the uneven flow rate, respectively, and flow rate) of the liquid.

Possible mode of operation of the device on the “points”, i.e. at a constant depth. When this device is installed at a certain depth and record the liquid flow rate for a certain period of time (15-30 C). Sequentially changing the depth in suspicious locations, it is possible with sufficient accuracy to establish a violation of the production string.

The advantages of the proposed device in comparison with the known (prototype):

- accuracy of measurements depends on the relative geometry of the impellers of the main sensing element;

- the presence of an additional sensor element and sensor ensures the duplicate readings of major sensitive components, which eliminates measurement errors, increases accuracy and allows you to capture areas with extremely low consumption.

Used information

1. A.S. No. 1002555, IPC E 21 In 47/10, 1983 prototype.

2. A.S. No. 759712, IPC E 21 In 47/10, 1980.

Device for detecting irregularities in the production string containing the case with Windows in the lower and upper ends, the main sensitive elements in the form of impellers and pokerwise elements placed in pairs at the ends of the casing, the side window made in the housing between the main is obsticale elements, and the Converter is connected to surface equipment, characterized in that it is provided with an additional sensor element in the form of an impeller located in the side tube installed inside the housing between the main sensitive elements, the lower end of which is connected with a side window, and the diameter of the impeller additional sensing element is less than the diameter of the impellers of the basic sensing elements; equipped with a temperature sensor installed in the side tube, and the Converter consists of a control unit, mounted on the housing, comprising a locator and an electronic microprocessor-based device.



 

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