RU2708736C1 - Cell sampler - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular, to cut-off-type devices for sampling from pressure pipelines. Cell sampler consists of a housing, a probe, a piston, a piston stop, an external drive, a sample receiver, the housing is a cylindrical part of the pipeline with a guide part for only reciprocal movement of the probe, with a drain channel, at the outlet of which there is a sample receiver, the probe has a blind axial groove, in which a piston is movably installed, and a piston stop which is fixed in the outlet part of the probe, in the side wall of the probe in the deepest point of the groove there is a through window, between the piston and the probe a piston spring is installed, which tends to press the piston to the deepest point of the groove and to close the through hole, the probe is able to move inside the housing under the action of an external drive, probe has two extreme positions, in the extreme position of sampling the through window is in the extraction zone in the flow center, wherein the through opening is located along the flow direction, and in the sample discharge position, the through opening is located in the sample drain zone at the level of the drain channel, between the outer surface of the probe and the guide surface of the housing, four seals are located, wherein two of these seals are located between the sampling zone and the sample drain zone and form a sample cut-off zone.

EFFECT: high reliability of the sampled sample with simultaneous elimination of the check valve as a separate device.

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Description

The invention relates to the oil and gas industry, in particular to die-cutting devices for sampling from pressure pipelines, and can be used to control the processes of production, preparation, transportation and storage of oil, oil products, regardless of their rheological properties and ambient temperature, ensuring their high reliability.

Known automatic device for sampling liquid, gaseous media and their mixtures from pipelines (patent for utility model No. 52637). It is characterized by the fact that the cylindrical barrel of the probe and the rotary rod introduced into it are provided with through longitudinal slots covering the inner diameter of the pipeline, while the length of the barrel with its lower end extends beyond the inner diameter of the pipeline, and a depression is made in the pipeline, a three-way valve is equipped with a metering chamber with a movable differential piston and is rigidly connected to the probe rod and actuator, and a flow mixer is introduced into the pipeline before the probe.

A disadvantage of the known device is the low reliability of the sample due to the fact that water, which is a hydraulic piston, may also be present in the sample.

A sampling device for integrated sampling of a multicomponent gas-liquid medium is known (patent for invention No. 2253012), comprising a hollow body installed in the pressure pipe of the wellhead fittings, inside of which there is a rotary body for controlling the flow of a multicomponent gas-liquid medium, a sampling chamber with intake channels, a shut-off body with an inside of the housing sampling drive valve, handle and guide pipe. The hollow body is a fragment of the pressure pipe predominantly in the vertical section of the wellhead fittings, the flow control body of the multicomponent gas-liquid medium is made in the form of a smaller shutter installed on the shaft than the internal diameter of the hollow body, and the selective chamber is an annular cavity on the hollow body located at the flap level and communicated at the inlet with the flow of a multicomponent gas-liquid medium through intake channels made symmetrically to the axis of rotation of the bones, and at the exit - with a locking body, the drive screw installed in the housing of the locking body is connected to the sampling valve with the possibility of rotation relative to each other and joint axial movement, and the sampling valve and the shaft with a shutter are coupled with the possibility of synchronous limited rotation around the common axis and relative axial displacement.

A disadvantage of the known device is the presence of a sampling valve with its inherent disadvantages (high hydraulic resistance, sudden pressure drops at the moments of actuation, additional structural connections), as well as the presence of a stagnant zone between the sampling zone and the valve, significantly affecting the reliability of the sample.

A known sampler for highly viscous oil (patent for invention No. 2573658), comprising a tubular body with connecting elements at the ends and mounted sampling and sampling devices, a spring-loaded valve for receiving and draining the selected sample into the storage tank and actuator, the sampling device housing is made up - upper and lower, connected by flanges, the upper of which is equipped with a hydraulic cylinder with a spring-loaded piston, the rod of which is connected to a spring-loaded drive sleeve, supported by plunger. The under-piston space is hydraulically connected with the over-piston space of the drive hydraulic cylinder, the piston rod of which is pivotally connected to the rod of the electro-hydraulic pusher, electrically connected to the controller, which together with the drive hydraulic cylinder drive the sampler drive, the lower case with the guide tube installed inside and connected to the cavity inside the sampler body, pipes with the possibility of axial movement mounted hollow sample cutter with spring-loaded rolling pin in the morning, the said cutter with its upper end is connected by pins through the connecting link with the lower end of the drive sleeve, and the lower end is connected to the cavity of the flow stabilizer body, which concentrates the flow of the entire cross section of the pipeline in the sampling area by the cutter, the sample receiving device is made in the form of a stepped cylinder with a central channel and mounted coaxial to the body of the sampling device, its smaller stage is equipped with a spring-loaded sleeve and a sealing ring on the outer surface and is in communication with the floor the flow stabilizer, while its diameter is chosen smaller than the internal diameter of the sample cutter for the possibility of docking with each other after the cutter presses the spring-loaded sleeve.

A disadvantage of the known sampler is the presence of a sampling valve with its inherent disadvantages (high hydraulic resistance, sudden pressure drops at the moments of actuation, additional structural connections).

The closest technical solution to the claimed one is an automatic sampler (patent for utility model No. 150614), comprising a housing fixed by flanges in the pipeline, a control unit, a drive connected to a sampling probe made in the form of a sleeve, inside which a movable piston is placed, interacting with the reverse a valve installed in the lower part of the housing, characterized in that the actuator is made in the form of two actuators mounted on the housing, and the rod of one actuator is connected to the sleeve by a lever mechanism m, the stem of another actuator is connected to the piston.

The disadvantages of the known sampler belonging to the class of cell samplers are the presence of a sampling valve with its inherent disadvantages (high hydraulic resistance, sudden pressure drops at the instant of operation, additional structural connections), as well as low reliability of the samples, since sampling is not carried out in the middle of the stream .

The technical task of the inventive cell sampler is to increase the reliability of the sample taken while eliminating the check valve as a separate device.

The stated technical problem is solved by a cell sampler, consisting of a housing, a probe, a piston, a piston stop, an external drive and a receiver. The casing is a cylindrical part of the pipeline with a guide part for only reciprocating movement of the probe, with a drain channel, at the outlet of which a probe is installed. The probe has a non-through axial groove in which the piston is movably mounted, and a piston stop, which is fixed in the output part of the probe groove. A through window is made in the side wall of the probe at the deepest point of the groove, a piston spring is installed between the piston and the probe, which tends to press the piston to the deepest point of the groove and block the through window. The probe has the ability to move inside the housing under the action of an external drive, the probe has two extreme positions, in the extreme position of sampling, the through window is located in the sampling zone at the center of the flow, while the through window is located along the flow direction, and in the discharge position of the sample, the through window is located four seals are located in the drain area of the sample at the level of the drain channel, between the outer surface of the probe and the guide surface of the body, two of these seals being located between the sampling zone and the willow samples and form a cut-off zone of the sample. That is, the function of the valve is performed by the constructive device of the probe and the housing itself.

Such a technical solution provides complete forced displacement of the entire sample volume from the probe, maximizing the reliability of the sample.

The claimed technical solution is illustrated by the schemes:

Figure 1 - Diagram of a cell sampler at the time of sampling;

Figure 2 - Diagram of the cell sampler at the time of discharge of the sample with a cross section in the sampling area;

The cell sampler consists of a housing 1, a probe 2, a piston 3, an emphasis on the piston 4, an external drive (not shown) and a sampler (not shown). The housing 1 is a cylindrical part of the pipeline with a guide part for the movement of the probe 2, with a drain channel 5, at the outlet of which a sample receiver is installed. The rotation of the probe 2 around its axis inside the housing 1 is limited, and only its reciprocating motion is free. The probe 2 has a through axial bore 6, in which the piston 3 is movably mounted, and a piston stop 4, which is fixed in the output part of the bore of the probe 2. A through-window 7 is made in the side wall of the probe 2 at the deepest point of the bore 7. Between the piston 3 and probe 2 a piston spring 8 is installed, tending to press the piston 3 to the deepest point of the groove 6 and block the through window 7. The probe 2 has the ability to move inside the housing 1 under the action of an external drive. The probe 2 has two extreme positions, in the extreme position of sampling, the through window 7 is located in the sampling zone “o” in the center of the stream, while the through window 7 is located in the direction of flow, and in the draining position, the through window 7 is located in the drain zone “ d "samples at the level of the drain channel 5. Between the outer surface of the probe 2 and the guide surface of the housing 1 there are four seals 9, and two of these seals are located between the sampling zone" o "and the drain zone" d "of the sample and form a cut-off zone" x " samples.

The piston 4 may have a seal.

The guide surface of the housing 1 at the level of the drain channel 5 may have a drain bore 10, forming a region of discharge into the drain channel 5.

The outer surface of the probe 2 at the level of the through window 7 may have a bore 11, forming with the drain bore 10 in the housing 1 an expanded drain area.

For greater reliability of the sample, the shape of the bore inside the housing 1 around the probe 2 can be performed symmetrical about the axes of the cylindrical part of the housing 1.

The piston stop 4 can be fixed in the probe 2 by a threaded connection 12 for the possibility of regulating the volume of the sample.

An external drive, which is, for example, an electromagnetic drive, can work both for forced movement of the probe 2 in both directions, and only for pulling the probe 2, and to retract the probe 2 back, in this case, it can with the help of a return spring 13 installed in case 1.

The sampler can have an automatic device for monitoring its filling, which, at the required level of filling the sampler, gives a signal that stops the sampler, while the drain channel 5 is automatically closed.

Cell sampler works as follows.

An external drive draws out the probe 2, placing (Fig. 1) the through-hole 7 in the selection zone “o”. In this case, due to excessive pressure in the pipeline, the piston 3, overcoming the force of the spring 8, moves to the stop 4 and releases the volume for the sample.

After that, the probe 2 is returned through an external drive or under the force of the return spring 13. In this case, the through-hole 7 first passes the “x” cut-off zone, in which the pressure is equalized and the sample volume is cut off from the flow. Then, the through window 7 enters (Fig. 2) into the sample discharge zone “d”, as a result of which the piston 3 displaces the sample volume under the influence of the spring 13 into the drain channel 5 with a lower pressure than in the pipeline, or directly if the drain channel 5 is located directly in front of the drain window 7, or through the drain area formed by the bores 10 and 11 in the housing 1 and the probe 2, if the drain channel 5 is located away from the drain window 7.

From the drain channel 5, the sample enters the sampler. When the probe is completely full, the probe may automatically stop working to eliminate the risk of overfilling and environmental damage. In this case, the drain channel can also automatically overlap.

The volume of the sample taken can be adjusted by screwing / unscrewing the stop 4.

It should be noted that the inventive cellular sampler is able to perform sampling very quickly, on the order of 0.2 seconds, which further increases the reliability of the sample, since with a long response in the sampling zone the medium manages to mix.

Claims (8)

1. A cell sampler, consisting of a body, probe, piston, piston stop, external drive, sampler, the body is a cylindrical part of the pipeline with a guide part for only reciprocating movement of the probe, with a drain channel, at the outlet of which a sampler is installed, a probe has a through axial groove in which the piston is movably mounted, and a piston stop, which is fixed in the output part of the probe groove, a through window is made in the side wall of the probe at the deepest point of the groove, m A piston spring is installed between the piston and the probe, which tends to press the piston to the deepest point of the groove and block the through window, the probe has the ability to move inside the housing under the action of an external drive, the probe has two extreme positions, in the extreme position of sampling the through window is in the sampling zone in the center of the flow, while the through-window is located in the direction of flow, and in the discharge position of the sample, the through-window is located in the drain area of the sample at the level of the drain channel, between the outer surface of the probe and four seals are located on the guiding surface of the case, two of these seals being located between the sampling zone and the sample discharge zone and form a sample cut-off zone. 2. The cell sampler according to claim 1, characterized in that the piston has a seal. 3. The cell sampler according to claim 1 or 2, characterized in that a drain bore is made in the guide surface of the housing at the level of the drain channel, forming a drain area into the drain channel. 4. The cell sampler according to claim 3, characterized in that a boring is made on the outer surface of the probe at the level of the through window, forming an extended drain area with a drain bore in the housing. 5. The cell sampler according to paragraphs. 1-4, characterized in that the shape of the bore inside the housing around the probe is made symmetrical with respect to the axes of the cylindrical part of the housing. 6. The cell sampler according to paragraphs. 1-5, characterized in that the piston stop is fixed in the probe by a threaded connection for the possibility of regulating the sample volume. 7. The cell sampler according to paragraphs. 1-6, characterized in that the external drive only works to extend the probe, and the probe is pulled back using a return spring. 8. The cell sampler according to paragraphs. 1-7, characterized in that the sampler has an automatic device for monitoring the filling of the sampler, with the ability to stop the sampler when filling the sampler to the required level and at the same time block the drain channel.

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