RU24701U1 - WELL FLOW METER SENSOR - Google Patents

Description

lillilliJilMiliJillJIlt, μl E21B47 / 00

20021010681

WELL FLOW METER SENSOR

The utility model relates to the oil industry, in

particular for hydrodynamic studies of oil, gas and

injection wells.

Known downhole tools for

hydrodynamic studies containing turbine sensors

expense. For example, downhole tools of the company "GEOTRON (g.

Tyumen) and MEGA-K (West Siberian Corporation

Tyumenneftepromgeofizika ").

In these devices, the flowmeter sensor impeller is located inside

annular holder protecting the impeller from radial

jets of liquid or gas in the intervals of perforation of the well. In both

flowmeter sensors are located at the bottom

downhole tool.

Significant disadvantages of this design sensors

flowmeters are:

clogging of the sensor in the well by mechanical particles falling into the gap between the turbine and the annular holder of the sensor housing, which leads to braking or stopping of the turbine; - insecurity of the turbine supports from clogging with sand and slit;

-protection of the magnetic system of the turbine from sticking

rust and metal particles;

- the design of the sensor does not allow it to be installed in the upper part of the downhole tool, since there is no transit electric wire in it, and therefore it can be installed only in the lower part of the downhole tool, which is most prone to clogging in the bottom of the well.

Known integrated downhole tool "AGDK scientific production company" Contact (Kimry), which is adopted as a prototype. In it, as well as in the above counterparts, the flowmeter sensor is located at the bottom of the downhole tool and does not have protection against clogging in the well.

The objective of the invention is to increase the reliability of the turbine sensor of the flowmeter in the well and increase the stability of its metrological characteristics by improving its flushing and protection against clogging in the well. The task is achieved by making the following improvements to the design of the turbine flow sensor:

in the proposed sensor there is no annular cage, which significantly reduces the likelihood of clogging and jamming of the turbine in the well. Experience with the use of such a sensor design in wells has shown that the absence of an annular cage does not affect the metrological characteristics of the flowmeter sensor;

the sensor has a transit wire that allows you to set

it in the upper part of the downhole tool, that is, in the part that is least prone to clogging in the bottomhole zone of the well;

turbine bearings are located in recesses protecting them from clogging with sand and sludge;

the magnetic system of the turbine is protected from sticking to its magnets of metal particles and rust by a special sleeve made of non-magnetic material.

The applicant is not aware of technical solutions containing similar features that distinguish the claimed solutions from the prototype, which allows us to conclude that its criterion of “Novelty and“ Inventive step. The invention is shown in FIG. 1.

The sensor comprises a turbine 1 with a converter 2, which are placed between two housings 3 and 4, connected by rigid rods 5. The rods have grooves to accommodate a larger diameter turbine. The turbine rotates on thrust bearings 6 and 7, which are placed in recesses made in the form of capsized cups 8. On the axis of the turbine there is a permanent magnet 9, closed by a sleeve 10 made of non-magnetic material, which protects the magnet from sticking of metal particles and rust to it. The sensor has a transit wire located in the tube 11 connecting the housings 3 and 4.

The flow meter sensor operates as follows.

The sensor in the downhole tool is lowered into the well on a cable or wire. In this case, the sensor turbine rotates with a frequency proportional to the flow rate of the liquid or gas and the velocity of the downhole tool. In this case, the magnet of the turbine interacts with the transducer 2. The current pulses generated in the transducer are transmitted via cable to the surface to the ground-based device or recorded in the memory of the downhole tool.

In order to improve the washability of the sensor and reduce the likelihood of clogging, there is no annular cage in it and the turbine is placed between the rigid rods 5 connecting the upper 3 and lower 4 of the sensor housing. To protect the bearings 6 and 7 of the turbine from clogging with sand and sludge, the bearings of the bearings are located in recesses 8 made in the form of capsized cups. To protect the magnet 9 from sticking of metal particles and rust, it is closed by a sleeve 10 made of non-magnetic material. Thus, the present invention improves the reliability of the sensor flowmeter in the well and increase the stability of its metrological characteristics.

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Claims (4)

1. A downhole flowmeter sensor comprising a turbine rotating on supports and a converter, characterized in that the turbine is placed between two bodies interconnected by rigid rods having grooves for accommodating the impeller of the turbine.  2. The downhole flowmeter sensor according to claim 1, characterized in that the thrust bearings of the turbine supports are located in recesses made in the form of capsized cups.  3. The borehole flowmeter sensor according to claim 1, characterized in that the magnet of the turbine is separated from the borehole medium by a sleeve made of non-magnetic material. 4. The downhole flowmeter sensor according to claim 1, characterized in that it has a transit electric wire extending in a tube connecting the upper and lower housing of the sensor.