Method for fluid flow control in well production strings

FIELD: oil production, particularly thermal field investigation inside producing wells.

SUBSTANCE: method involves lowering downhole cable provided with temperature meter in well, wherein downhole cable is arranged outside production string. Fluid temperature is measured by means of downhole measuring-and-stabilizing unit including at least one temperature sensor and parameter stabilizing device. The temperature sensor is installed so that sensing member thereof touches production string wall or production string clutch wall or is located in immediate proximity thereto. Crystal resonators are used as the temperature sensors. Land-based measuring assembly includes frequency electronic measuring module. The land-based measuring assembly and conductive signal transmitting communication line thereof with measuring-and-stabilizing unit may simultaneously read signals from all temperature sensors if number of temperature sensors exceeds 1.

EFFECT: increased measuring accuracy in working well in initial and following time periods and possibility of method usage in wells with any oil recovery mechanism.

7 cl

 

A known method of controlling the temperature of a liquid medium [1], according to which make the descent into the well on tubing (tubing) shank placed on the outer surface of the tubing and the shank on a strictly fixed distances from each other at least three temperature sensors, and record downhole temperature, which encode in digital form and stored in deep in the electronic memory block, if necessary, transmitting data over a communications line (cable) at the wellhead.

The disadvantage of this known method is that the data of the known device is measured not flow temperature of the liquid inside the tubing, measuring downhole parameters during the stopped pump.

Also there is a method of exploration, in particular, for the temperature control of the fluid flow, including a run in hole provided inside the airtight tubing submersible cable with the sensor element for measuring temperature, and the heater; the descent of the jet pump, mounted on the tubing, the subsequent pumping fluid (fluid flow) inside the tubing and casing annulus and check the temperature of the fluid flow in the perforated interval [2].

However, this known method is rather complex and requires a complex arrangement of wells.

Also what about the, to use this method, you must plug the well and temperature measurements to make in the broken well, which does not allow to obtain timely and reliable information about the temperature of the liquid stream.

Along with this, this method cannot be implemented in wells equipped with sucker rod pumps (SRP system), i.e. it is not universal.

The technical result achieved by the invention is to improve measurement accuracy in working well both in the initial and subsequent periods of time, while providing versatility for wells with any extraction method.

Additional technical result is a simplification of the way and less time to implement.

This technical result is achieved by the proposed method of temperature control of the fluid flow in the tubing of the well, including the descent into the borehole submersible cable with the installed element for temperature measurement and recording of the temperature of the fluid flow, while the new is the fact that during the descent into the well specified submersible cable, the cable is placed on the outside of tubing tubing, and as an element for measuring the temperature of the fluid used downhole measure is Ino-stabilizing unit, includes at least one temperature sensor and connected through the above-mentioned cable, perform the function of conductive signaturebase line with land measuring unit, with the specified sensor is positioned so that its sensing element is touching the wall of tubing or wall couplings tubing, or were in the immediate vicinity of the wall of the tubing or from the wall of the coupling tubing.

As temperature sensors using quartz resonators.

As a land measuring unit using a frequency electronic measurement module.

Land measuring unit and electrically conductive signalaveraged communication with downhole measurement-stabilizing unit is made with the possibility of simultaneously reading signals from all of these sensors for presence sensors more than one.

The temperature sensors are connected to ground measurement unit, providing the work continuous contact with one of the receiving / transmitting channel for all specified sensors.

Land measuring unit is carried out in a programmable frequency electronic measurement module, which includes a noise generator, a tunable input resonant amplifier, microprocessor control unit, microprocessor the first computing unit and an LCD display.

As a downhole measurement-stabilizing unit use unit consisting of at least one temperature sensor and a device for stabilizing parameters.

This technical result is achieved due to the following.

Because submersible cable with sensor (sensors) temperature when the shutter is placed outside of the tubing, is provided by the versatility of the proposed method for wells with any kind of exploitation: the fountain, using electrical submersible pump (ESP) and SRPS.

The orientation of the sensing element of the temperature sensor to the wall of the tubing or to the wall of the tubing coupling (by touching or being in close proximity) to improve the accuracy of the temperature measurement of the fluid flow within the tubing regardless of the depth of the sensor (typically, the extraction is done by lifting reservoir fluid - the fluid in the tubing above the surface), because the metal tubing is more conductive than the fluid medium, thereby the temperature of the wall of the tubing or space near it most accurately and reliably reflects the temperature of the fluid flowing through the tubing. Moreover, as a result of this same phenomenon, the temperature measurement accuracy will be high in the initial period of pumping fluid through the tubing, and all p the following periods of time. All this allows accurate control of the temperature field of the well.

The proposed method is simple, is carried out using simple equipment.

The proposed method is implemented as follows in the following sequence.

Directly at the well or at the cable site on the submersible cable, for example, brands Cpbp, Cnpbp, KG, etc., perform tight bends to connect the sensor (sensors) temperature, for example, quartz resonators. Their number depends on the depth of the well and the objectives to control thermal field well, but in any case they should be at least one, and in an advantageous embodiment, at least two. To perform the specified submersible cable functions conductive signaturebase line on one of its free end to produce an end sealing conductive wires, for example, "star", and the other free end connected to ground measurement unit located at the surface. There is another kind of connection with another cable design, for example, if the conductive core of the cable is made in the form of a loop, then all the ends of the lived interconnected and connected to the power source is from this place of connection.

Then make the descent into the well of the criminal code of the above prepared submersible cable with sensor (sensors) temperature, place it on the outside of tubing and attach them to the steel belts. When the sensor (sensors) are oriented so that it touches the outer wall of the tubing or outer wall of the coupling tubing or were in the immediate vicinity. In the case of multiple temperature sensors can set some of them on the walls of the tubing or couplings, and others in the immediate vicinity of said walls.

Then submersible cable through land measuring unit is connected to a power source. The sensor (sensors) produces temperature measurements of the fluid through heat exchange with the wall of the tubing). The signal from the sensor (sensors) temperature falls to the ground measuring unit, for example, a programmable frequency electronic module, which allows you to record and monitor thermal field wells. Due to the fact that in the design of a downhole measurement-stabilizing unit includes a device stabilization ensures the stability of the transmitted temperature data.

The proposed method was tested in laboratory conditions. This took a segment of tubing length 3 m, on its outer surface is fastened submersible cable brand CNPBP-120 3×8 with one quartz resonator, execute the named function temperature sensor. The sensitive element of the sensor touching the wall of the production tubing. Through the pipe tubing missed the flow of oil-water emulsion (water content 30%) at a rate of 0.2 l/s Primary flow temperature was set to +22°With (in the first experiment) and +40° (in the second experiment). The sensor in the first experience was at 22.1°and in the second experiment 40,1°C (error is 0,25-0,45%). Thus, it was confirmed that the proposed method is really accurate and reliable.

The proposed method has the following advantages over known:

- allows high accuracy and reliability to record the temperature of the fluid flow in the borehole;

- is universal and can be used in wells with any method of production;

- easy to implement and does not requires sophisticated equipment.

SOURCES of INFORMATION

1. RF patent №2244102, CL. EV 43/00, 2003

2. RF patent №2194855, CL. EV 47/00, 2001

1. The method of temperature control of the fluid flow in the tubing of the well, including the descent into the borehole submersible cable with the installed element for temperature measurement and recording of the temperature of the fluid flow, characterized in that during the descent into the well specified submersible cable, the cable is placed on the outside of the pump-compressor is s oil well tubing moreover, as an element for measuring the temperature of the fluid used downhole measuring and stabilizing the unit, which includes at least one temperature sensor and connected through the above-mentioned cable, perform the function of conductive signaturebase line with land measuring unit, with the specified sensor is positioned so that its sensing element is touching the wall of tubing or wall couplings tubing, or were in the immediate vicinity of the wall of the tubing or from the wall of the coupling tubing.

2. The method according to claim 1, characterized in that as temperature sensors using quartz resonators.

3. The method according to claim 1, characterized in that as a land measuring unit using a frequency electronic measurement module.

4. The method according to claim 1, characterized in that land measuring unit and electrically conductive signalaveraged communication with downhole measurement-stabilizing unit is made with the possibility of simultaneously reading signals from all of these sensors for presence sensors more than one.

5. The method according to claim 4, characterized in that all the temperature sensors are connected to ground measurement unit, providing the work continuous contact with one transceiver Kahn the Les for all of the above sensors.

6. The method according to claim 1, characterized in that land measuring unit is carried out in a programmable frequency electronic measurement module, which includes a noise generator, a tunable input resonant amplifier, microprocessor control unit, microprocessor computing unit and an LCD display.

7. The method according to claim 1, characterized in that as a downhole measurement-stabilizing unit use unit consisting of at least one temperature sensor and device stabilization parameters.



 

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FIELD: oil and gas industry, particularly to stimulate oil production.

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9 cl, 3 dwg

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EFFECT: reduced time of pressure measurement and data transmission.

7 cl, 1 dwg

FIELD: testing the nature of borehole walls and formation testing particularly for obtaining fluid samples or testing fluids, in boreholes or wells.

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EFFECT: increased accuracy of well and formation testing.

38 cl, 29 dwg

FIELD: survey of boreholes or wells, particularly measuring temperature or pressure in running wells.

SUBSTANCE: device comprises land-based assembly and submersed assembly including pressure transducer made as pressure unit linked to measuring resistor with output connected to land-based assembly inlet through diode and communication line. Land-based assembly includes power source, computing unit, digital indicator, the first analog-digital power source voltage converter, and the second analog-digital power source voltage converter. Land-based assembly input is linked to input of the first analog-digital converter having output linked to the first input of the computing unit. Land-based assembly input is also connected with the first output of power source having the second output linked with ground through resistor and with input of the second analog-digital converter. Output of the second analog-digital converter is connected to the second input of computing unit. The first output of computing unit is connected to digital indicator. The second output thereof is linked to power source input.

EFFECT: increased operational reliability.

1 dwg

FIELD: well survey, particularly geothermal well survey.

SUBSTANCE: temperature probe assembly comprises temperature sensors installed in upper or lower assembly part and uniformly distributed around a circle having radius r>R3/2, where R3 is probe assembly radius. Circle center coincides with probe assembly axis. Assembly also has safety lamp made as a pipe with orifices. Summary orifice area is not less than pipe cross-sectional area. The probe assembly may be provided with two centralizers arranged in upper and lower parts thereof. In some variants temperature sensor is arranged along assembly axis in upper or lower part thereof, probe assembly has safety lamp made as a pipe with orifices, wherein summary orifice area is not less than pipe cross-sectional area, and pressing device. The pressing device includes two springs arranged in upper and lower probe assembly parts. Temperature sensor is 1-2 mm under or over safety lamp end plane correspondingly. In other variants safety lamp has beveled end and is pressed to pipe string by short generator thereof. Probe assembly variants including temperature sensors and two centrators in upper and lower parts are also disclosed. The temperature sensors are arranged on each spring of upper centrator in upper part thereof or each spring of lower centrator in lower part thereof is provided with one temperature sensor spaced a distance from pipe string or production string axes. The distance is determined from equation. In just other variants probe assembly has centrators arranged in upper and lower parts thereof and temperature sensors carried by substrate formed of resilient material and arranged in lower probe assembly part between springs of lower centrator or in upper probe assembly part between upper centrator springs. Each spring is provided with limiting strip to restrict substrate and temperature sensor displacement with respect to probe assembly axis. Temperature sensors are located in upper or lower probe assembly parts in dependence of downhole instrument movement direction during well survey performance.

EFFECT: increased accuracy of continuous temperature measurement along generator defined by temperature sensor movement due to elimination of liquid mixing in front of temperature sensor.

12 cl, 7 dwg

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