RU2334101C1 - Valve sampler device - Google Patents

Abstract

FIELD: mining; physics.

SUBSTANCE: device includes seat and ferromagnetic valve, the seat being equipped with a permanent magnet system, while the valve has ferromagnetic inserts with Curie magnetic transition point equal to oil temperature at the sampling site.

EFFECT: improved device efficiency due to actuating valve device at given oil sampling site and creating additional press force.

1 dwg

Description

The invention relates to the oil industry and can be used, for example, in samplers for sampling oil from a well.

The closest technical solution to the proposed is the valve device of the sampler of the VNII-1 system [Study of reservoir oils / A.I. Khaznaferov. - M .: Nedra, 1987. - S.54-55], containing a seat, a valve made of ferromagnetic material and a valve operation control unit. The valve is controlled by a hydraulic power relay, driven by oil pressure in the well and designed to open the oil to the sampler and close it after filling.

The disadvantage of the prototype is its lack of effectiveness, associated with the dependence of the place of actuation (opening and closing of the valve device) from many uncontrollable factors (temperature difference at the wellhead and bottom of the well, speed of descent of the device, unexpected stops of the sampler), poor valve tightness due to that the oil pressure force pressing the valve to the seat is not large enough.

The problem to be solved and the expected technical result are to increase the efficiency of the device due to the actuation of the valve device in a given place of oil sampling and the creation of additional clamping force, which allows to increase the tightness due to a more tight fit of the valve to the seat.

The problem is solved in that the valve device of the sampler, consisting of a seat and a valve of ferromagnetic material, is characterized in that the seat is equipped with a system of permanent magnets, and the valve has inserts of ferromagnetic material with a Curie point equal to the temperature of the oil at the sampling location.

The Curie point is the temperature above which the spontaneous magnetization of a ferromagnet disappears, and it goes into a paramagnetic state [New Polytechnical Dictionary / Ed. A.Yu. Ishlinsky. - M .: Big Russian Encyclopedia, 2000. - P.256]. For example, the Curie point of electrolytic iron is 768 ° C. [Handbook of elementary physics / N.I. Koshkin, M.G.Shirkevich. - M .: Science. - 1988. - P.166 (Table 110 Curie temperature of metals)], and the Curie point of some alloys of the Fe-Nd-Ru system is in the range from 36 ° C to 202 ° C [Yu.I. Rusnyak et al. Study of magnetic properties alloys of the Fe-Nd-Ru system. - Herald Mosk. University. Ser. 2. Chemistry. 2005.V. 46. No. 6. S.420].

The drawing shows the inventive device, where

1 - Saddle

2 - Valve made of ferromagnetic material

3 - Inserts of ferromagnetic material with a Curie point equal to the temperature of the oil at the sampling location

4 - Permanent magnet system.

The device comprises a saddle 1 equipped with a system of permanent magnets 4, and a valve 2 of ferromagnetic material with inserts 3 of ferromagnetic material with a Curie point equal to the temperature of the oil at the point of sampling. It is recommended to attach a set of interchangeable valves 2 to the device, having inserts 3 made of ferromagnetic materials with various Curie points.

The drawing shows, for example, the inventive device with a variant of a conical valve 2 of ferromagnetic material. Valve 2 has inserts 3 of ferromagnetic material with a Curie point equal to the temperature of the oil at the sampling location.

The system of permanent magnets 4, equipping the seat 1, is preferably located at the maximum depth of the seat for the most deep-seated valve in it and ensure tightness; for example, directly from the outside of the valve device. The resulting magnetic field causes a force pressing the valve 2 of the ferromagnetic material to the seat 1.

The proposed valve device operates as follows.

Before taking a sample, a valve 2 is installed in the valve device, having inserts 3 of ferromagnetic material with a Curie point equal to the temperature of the oil at the proposed sampling location. In the initial state, the valve 2 is pulled to the magnet system 4 and pressed against the seat 1. The clamping force is sufficient to keep the valve device closed. It is known that the temperature of oil reservoirs depends on their depth. Upon reaching the specified depth, which corresponds to a certain temperature of the oil, valve 2, as a result of heat exchange with oil, is heated to this temperature equal to the Curie point of the ferromagnetic material from which the inserts are made. 3. The inserts 3 lose their magnetic properties, the clamping force decreases and the valve the device opens. As a result, a sample of oil enters the sampler. As the oil enters the sampler, the external and internal pressures are equalized. The valve 2 is pressed against the seat 1 with a force sufficient to prevent leakage of oil from the sampler in the initial stage of its lifting. When the sampler is lifted, valve 2 cools below the Curie point, the magnetic properties of the inserts 3 are restored, and valve 2 is pressed against the seat 1, reliably sealing the oil sample.

Claims (1)

The valve device of the sampler, consisting of a seat and a valve made of ferromagnetic material, characterized in that the seat is equipped with a system of permanent magnets, and the valve has inserts of ferromagnetic material with a Curie point equal to the temperature of the oil at the point of sampling.