RU2257471C1 - Sampler - Google Patents

Abstract

FIELD: oil-field equipment, particularly for obtaining fluid samples or testing fluids in boreholes or wells and may be used for integrated obtaining sample of multicomponent liquid-gas systems transported through pipelines.

SUBSTANCE: sampler comprises hollow body installed in high-pressure pipeline of wellhead fittings and extraction chamber with discharge channels. Rotary tool adapted for multicomponent liquid-gas medium flow regulation is installed inside the body. Sampler also has shutoff member with actuated sample extracting valve, handle and guiding tube. Sampler comprises hollow body made as a part of high-pressure pipeline and tool adapted for multicomponent liquid-gas medium flow regulation arranged in hollow body. The tool consists of flap installed on a shaft and having diameter corresponding to inner hollow body diameter, extraction chamber used to extract and mix multicomponent liquid-gas medium flow formed as annular cavity around hollow body. The cavity is divided into inlet and outlet parts by partition arranged at flap level. Inlet and outlet parts communicate with common multicomponent liquid-gas medium flow correspondingly through inlet and outlet channels on hollow body and through opening formed in the partition at sample extracting valve inlet. Drive screw installed in shutoff member body is connected with sample extracting valve so that drive screw and sample extracting valve may perform mutual rotation and move in axial direction. Sample extracting valve and shaft with flap mate each other so that they may perform synchronous limited rotation about common axis and mutual axial movement.

EFFECT: increased simplicity, provision of high-quality mixing of sample product and increased sample reliability.

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Description

The invention relates to oilfield equipment for sampling for analysis at the wellhead and can be used for integrated sampling of multicomponent gas-liquid systems transported through pipelines.

According to the structural and functional features, the closest analogue is a sampling device (patent RU 2151290 G 1), inside which is located a flow control element of a multicomponent gas-liquid medium, equipped with sealing elements, a selective chamber in the form of a sealed spherical segment with intake channels, a shut-off body with a guide tube, a sampling valve mounted to interact with a spring-loaded stem.

The flow control and shutoff are individually actuated by separate handles in a specific sequence.

The disadvantages of the known device include the complexity of the design, which increases its cost and operating costs, complicates its maintenance. The flow control is driven by a shaft with stuffing box packing, the operation of which must be strictly monitored:

a) periodically tighten the stuffing box to prevent leaks;

b) as wear and tear, add stuffing box seals or replace with a new set, which is associated with well shutdown, environmental damage at the wellhead, etc.

There is a danger that parts distant from the main flow of the process fluid, such as a rod, a spring, can “pick up” with frost, because water may occur in the oil and the device will have to be heated during sampling. In addition, during the sampling process, the space intended for the movement of the process stream is completely blocked by the control body of this stream. The sampling chamber is intensively filled with a multicomponent gas-liquid mixture (process stream) and delaminates, since the flow movement is noticeably reduced and the sampling process depends on the human factor, how correctly and clearly the operator will act in this case. In this regard, there is no full guarantee of obtaining a sample with an objective ratio of components.

The technical problem solved by the invention is to simplify the design and maintenance, increase the reliability of the device and the quality of sampling of a multicomponent gas-liquid medium.

This object is achieved in that a sampling device for integrated sampling of a multicomponent gas-liquid medium, containing a hollow body installed in the pressure pipe, inside which a rotary body for controlling the flow of the multicomponent gas-liquid medium is located, a sampling chamber with inlet channels, a shut-off element with a sampling drive valve sample, the guide tube, it includes a hollow body in the form of a fragment of the pressure pipe, the sweat control a multicomponent gas-liquid medium located in a hollow body and consisting of a damper mounted on the shaft with a diameter corresponding to the inner diameter of the hollow body, a chamber for sampling and mixing the flow of the multicomponent gas-liquid medium in the form of an annular cavity on the hollow body, divided by a partition at the input and output parts in communication with the general flow of a multicomponent gas-liquid medium through respectively inlet and outlet channels on the hollow body and through the passage provided in the baffle at the inlet to the sampling valve, the drive screw installed in the body of the shut-off element being connected to the sampling valve for rotation relative to each other and for joint axial movement, and the sampling valve and shaft with a shutter are coupled with the possibility of synchronous limited rotation around common axis and relative axial displacement.

Figure 1 shows a section along the line aa in figure 2; figure 2 is a section along the line BB in figure 1; figure 3 is a section along the line bb in figure 2.

The sampling device (hereinafter, the device) comprises a hollow body 1 (Fig. 1), which is a fragment of a pressure pipe located indifferent to the surface of the earth. The flow control body of a multicomponent gas-liquid medium is made in the form of a damper 3 mounted on the shaft 2 with a diameter corresponding to the inner diameter of the hollow body 1. At the level of the damper 3, a selection and mixing chamber 4 with the body 5 is provided on the outside of the hollow body 1 (Fig. 1), divided in half the partition 6 to the input 7 and output 8 parts (figure 2), communicated with the common flow of a multicomponent gas-liquid medium through respectively the inlet 9 and outlet 10 channels on the hollow body 1 and through the passage 11 (figure 3) provided in partition 6 at the inlet to the sampling valve 12.

In the boss 13, a valve seat 14 with a gasket 15 is installed, fixed by means of a union nut 16 through the housing 17 of the valve 12 with a guide tube 18 (Fig. 1). The rear end of the sampling valve 12 is configured to interact with the drive screw 19 due to the annular protrusion 20 (Fig.1,3). The other end of this valve 12 (Fig. 1) is connected to the shaft 2 by means of a spline connection (see the remote section on the right, Fig. 1), and the shaft 2 with the shutter 3 are mounted with respect to the hollow body 1 with the possibility of limited rotation (by 90 °) due to the cam connection provided on the other end of the shaft 2 (see the remote section on the left, figure 1).

The device operates as follows. With the open position of the shutter 3, the sampling valve 12 is closed, which corresponds to the initial position. The flow of a multicomponent gas-liquid medium mainly passes directly through the hollow body 1 (Fig. 1). However, it is possible that some of this medium through the inlet 9 and outlet 10 channels (figure 2), as well as through the passage 11 (figure 3) can flow in a roundabout way, although the shutter 3 is open, which in no way affects.

Before sampling, it is necessary to install an appropriate container (not shown) under the guide tube 18 (figure 1). Turn the drive screw 19 to the flap, first of all, the sampling valve 12, being pressed to the end of the drive screw 19 with its annular protrusion 20, will turn 90 ° by the pressure from the side taken to the sample, dragging the shaft 2 s along with it the shutter 3 due to the splined connection, and will take a closed position 21 (figure 1). With a further flap of the drive screw 19, the valve 12 moves away from the seat 14, creating conditions for sampling, in which the mixture being taken, passing from the inlet part 7 through the inlet channels 9 and the passage 11 (Fig. 3), is simultaneously mixed, concentrating directly at the entrance to sampling valve 12, and through the latter enters the sampling tank. The part of the mixed multicomponent gas-liquid mixture flowing through the passage 11 enters the outlet part 8 of the sampling and mixing chamber and, through the outlet channels 10, enters the hollow body again, which creates normal conditions for the passage of the process fluid during the sampling process.

After sampling the required volume, the drive screw 19 is rotated to close. In this case, first of all, the valve 12 together with the shaft 2 and the shutter 3 rotate 90 °, i.e. from position 21 returns to its original position (figure 1). A further rotation of the drive screw 19 causes the sampling valve 12 to move forward, which ends with its closure. At this time, the cam connection provided at the end of the shaft 2 prevents further rotation of the shutter 3, and the valve 12 relative to the shaft 2 makes axial movement due to the spline connection and axial movement joint with the drive screw 19. The taken sample is sent for analysis.

At the end of the work, the position of the shutter 3 is checked by opening 22 at the rear end of the sampling valve 12, because the shutter 3, the hole 22 are located in the same plane. If, for any unforeseen circumstances, the shutter 3 remains closed, then, after loosening the drive screw 19, the valve 12, catching on its hole 22, it is necessary to turn until the shutter opens and tighten the drive screw completely.

Thanks to the constructive solution, compactness, simplicity of the device is achieved, and the inherent mixing scheme of a multicomponent gas-liquid medium using the kinetic energy of the stream allows to achieve high-quality mixing of the sampling product, simplifies the sampling technology regardless of the human factor. The valve pair is located in close proximity to the main process stream, which eliminates the likelihood of freezing in winter.

Claims (1)

A sampling device for integrated sampling of a multicomponent gas-liquid medium, containing a hollow body installed in the pressure pipe of the wellhead, inside which a rotary body for controlling the flow of the multicomponent gas-liquid medium is located, a sampling chamber with inlet channels, a shut-off body with a drive sampling valve located inside the body, a handle and guide tube, characterized in that it contains a hollow body in the form of a fragment of the pressure pipe, the control a flow of a multicomponent gas-liquid medium located in a hollow housing and consisting of a damper mounted on the shaft with a diameter corresponding to the inner diameter of the hollow housing, a sampling and mixing chamber for the flow of a multicomponent gas-liquid medium in the form of an annular cavity on a hollow housing, divided by a partition at the inlet output parts communicated with the general flow of a multicomponent gas-liquid medium through, respectively, inlet and outlet channels on the hollow body and through a passage provided in the partition at the inlet of the sampling valve, the drive screw installed in the shutter body housing being connected to the sampling valve for rotation relative to each other and for joint axial movement, and the sampling valve and shaft with a shutter are coupled with the possibility of synchronous limited rotation around a common axis and relative axial displacement.

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