RU2333358C2 - Subsurface sampler - Google Patents

Abstract

FIELD: petroleum industry.

SUBSTANCE: invention relates to the mining industry and can be used for taking subsurface samples of oil in production and exploration wells, mainly operating by the natural flow production method. The subsurface sampler contains the receiving chamber, the upper and the lower valves, the piston, sealing assemblies, valve rods for retaining samples in the sampler, the locking mechanism, the upper head and the lower tail piece with a hole for passing the fluid; the sampler is also provided with a stirrer located in the receiving chamber between the upper and the lower valves. The piston is of cylindrical form with axial boring, in which a spring-loaded valve is accommodated. The retaining and restricting nuts are provided in the bottom of the piston. The subsurface sampler is made so that it can be connected with the valve control mechanism in the upper and in the lower parts of the sampler.

EFFECT: increased strength of the sampler and operational reliability.

2 cl, 3 dwg

Description

The invention relates to the mining industry and can be used for deep oil sampling in existing and exploratory wells, mainly working in a fountain way.

A known deep-flow type sampler containing a locking mechanism located in the housing interacting with a control and controlled valve assemblies and a relay device, the valves are made of solid rubber with taper angles of 30 °, and a butt relay consisting of a housing with holes for the pusher pin, interacting on the control valve assembly and bushings with holes for the passage of fluid, and the butt relay is equipped with antennae for hooking with the connection n aso-compressor pipes when the sampler moves down. (See RF patent No. 2265123, IPC ЕВВ 49/08, published on January 20, 2005).

A disadvantage of the known flow-through depth sampler is contact with the working fluid, which adversely affects the quality of the taken depth sample.

The closest in technical essence and the achieved result to the deep sampler declared by us is a device for sampling formation fluid in the well, a deep-well piston sampler PPG-3, including a tip, lower and upper valves, a piston, a collet, an expansion ball, a lever, pushers, a spring , pin (see E.Sh. Aliyev, K.V. Vinogradov “Determination of saturation pressure of reservoir oil directly at the bottom of the well” Azerbaijan State Publishing House of Oil and Scientific and Technical Literature. Baku, 19 60, p. 45-47).

The disadvantage of the known device, taken as a prototype, is the design complexity, low reliability, due to the presence of a large "dead" volume and the presence of "extra" parts in the chamber, such as a cable, loose collet and a valve with a rigidly fixed ball.

The objective of the present invention is to simplify the design of the sampler and increase reliability in operation.

The task in the depth sampler, including the receiving chamber, the upper and lower valves, the piston, sealing units, valve stems for holding the sample in the sampler, the locking mechanism, the upper head and the lower tip with holes for the fluid passage, is solved by the fact that the depth sampler is equipped with a mixing a device located between the upper and lower valves, and the piston is made in the form of a cylindrical body with an axial groove in which the spring-loaded valve is placed, and the piston in the lower part nabzhen retaining nuts and restrictive, the sampler depth is adapted to be connected to valve control mechanism as the bottom and the top of the probe.

The problem is also solved by the fact that the mixing device is made in the form of a sleeve, in the mating part of which the holes are made in diameter, and a hole is made in the central part, while on the outside of the sleeve at the same distance from each other, slots are made.

The salient features of our claimed invention are:

- the piston is made in the form of a cylindrical body with an axial groove in which a spring-loaded valve is placed, and the piston in the lower part is equipped with a holding and restrictive nuts;

- the deep sampler is made with the possibility of its connection with the valve control mechanism, both in the lower and upper parts of the sampler;

- the deep sampler is equipped with a mixing device located in the receiving chamber between the upper and lower valves;

- the mixing device is made in the form of a sleeve, in the mating part of which the holes are made in diameter, and a hole is made in the central part, while on the outside of the sleeve at the same distance from each other, slots are made.

The above significant distinguishing features were not known to us from the sources of patent and scientific and technical information and, therefore, are “new”, which corresponds to the patentability condition of “novelty”.

The claimed significant distinguishing features in combination with the known ones allow achieving a technical result, are not obvious to the average person skilled in the art, which contributes to the patentability condition “inventive step”.

The claimed technical solution has successfully passed field tests, which allows us to conclude that the technical solution meets the condition of patentability "industrial applicability".

Figure 1 shows the claimed depth sampler in section. Figure 2 shows a mixing device in section, and figure 3 shows a top view of a mixing device.

The downhole sampler contains a receiving chamber 1 (see FIG. 1), in which a piston 2 with sealing rings 3 is placed. In the axial groove 4 of the piston there is a rod 5 with a lock nut 6 in the lower part and a valve 8. spring-loaded in the spring 7. The piston in the lower part 2 is provided with a restriction nut 9 to limit the downward movement of the piston 2 in the intake chamber 1, and the piston 2 is provided with a retaining nut 10 to prevent the piston 2 from moving during fluid sampling.

The upper part of the receiving chamber 1 of the deep sampler is connected to the valve assembly 11, which includes a stem 12 with a spring 13, o-rings 14 and a valve 15.

In the upper part, the valve assembly 11 is connected to the head 16 for attaching the depth sampler with a wire to the winch when the depth sampler is lowered into the well (not shown in Fig.).

In the lower part, the receiving chamber 1 (see Fig. 1) is connected to a tip 17 in which holes 18 are made for the passage of fluid.

A mixing device 19 is placed in the receiving chamber 1 between the upper valve assembly 11 and the piston 2, which includes a sleeve 20, a mating cylindrical part 21, in which holes 22 are made in diameter, and a hole 23 is made in the central part of the mating cylindrical part 21 ( see figure 2 and 3).

On the outside of the sleeve 20 (see figure 2 and 3) are made at the same distance of the slots 24.

In the process of working with a deep sampler, valve control mechanisms are used (not shown in Fig.).

The downhole sampler works as follows:

Before the descent of the “deep sampler” into the well, for sampling a deep sample of fluid, it is equipped with valve control mechanisms (MUKs), for this purpose, the head 16 and the tip 17 in Fig. 1 are screwed, we designated these places at 25. When screwing the valve control mechanism (MUK) in the upper part of the sampler pos.25, the MUK pusher (not shown in Fig.) Acts on the stem 12 and opens the valve 15 of the sampler. In the same way, when screwing the MUK (not shown in Fig.), The MUK pusher (not shown in Fig.) Acts on the stem 5 and opens the valve 8 of the sampler. Then the sampler with open valves 8 and 15 is lowered into the well. The sampler at this moment works as flowing. At a given point of sampling a deep sample in the well, the calibrated pins of the MUK are cut off and the plunger of the MUK (not shown in FIG.) Moves up into the glass (not shown in FIG.). Valves 8 and 15 are closed by the pressure in the well, and the sampler springs 7 and 13 firmly hold the valves of the sampler 8 and 15 closed. A sampler with a sampled sample is removed from the well. After raising the deep sampler to the surface, unscrew the control mechanisms of the valves of the sampler in the upper and lower parts (see pos. 25 of Fig. 1), then unscrew the restriction nut 9 and tighten the plug (in Fig. Not shown) to prevent the valve from opening and hit of buffer fluid in the receiving chamber 1 of the sampler in the process of transferring a deep sample to the research equipment. Next, in the upper and lower parts of the sampler, heads with valves are screwed to transfer the sample (not shown in Fig.) To the research equipment. A thermostatic jacket is put on the sampler, connected to a thermostat and a press (not shown in Fig.). After that, the pressure and temperature of the point of sampling the deep sample in the well are created and, by swaying the sampler, the mixing device 19 is moved in the chamber 1 of the sampler and the oil sample, passing through the opening 22 of the mixing device, is mixed in the chamber 1. Then, with the help of the head for transferring the sample (to Fig. not shown) buffer fluid creates pressure on the plug (not shown in Fig.), installed instead of the restrictive nut 9. The plug, testing the pressure of the buffer fluid, moves the piston 2 with valves and 8 upwards and displaces the selected oil sample, which, passing through the opening 22 of the mixing device 19, is mixed and squeezed by means of a press and buffer liquid into the research equipment (not shown in Fig.).

Claims (2)

1. An in-depth sampler including a receiving chamber, upper and lower valves, a piston, sealing assemblies, valve stems for holding the sample in the sampler, a locking mechanism, an upper head and a lower tip with a hole for fluid passage, characterized in that the depth sampler is equipped with a mixing device located in the receiving chamber between the upper and lower valves, and the piston is made in the form of a cylindrical body with an axial groove in which the spring-loaded valve is placed, and the piston in the lower part with it is fitted with a holding and restrictive nuts, while the deep sampler is made with the possibility of its connection with the valve control mechanism, both in the lower and upper parts of the sampler. 2. The depth sampler according to claim 1, characterized in that the mixing device is made in the form of a sleeve, in the mating part of which holes are made in diameter, and a hole is made in the central part, while on the outside of the sleeve at the same distance from each other cut through.

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