RU2253012C1 - Sample-taking device - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: hollow body of device is actually a fragment of force pipeline at mostly vertical portion of mouth armature. Organ for controlling flow of multi-component gas-liquid substance is made in form of valve mounted on shaft having lesser size, than inner diameter of hollow body. Sample chamber is in form of ring-shaped hollow on hollow body, positioned at same level with valve. Ring-shaped hollow is connected at input to flow of multi-component gas-liquid substance through intake channels, positioned symmetrically to valve rotation axis, and at output - with locking organ. Driving screw mounted on body of locking organ is connected to sample-taking valve with possible mutual rotation and combined axial displacement. Sample-taking valve and shaft with valve are mated with possible synchronous rotation around common axis and relative axial displacement. Working organs of device are positioned immediately near main flow of substance taken as sample to provide for lesser dimensions of device and prevented freezing in winter season.

EFFECT: simplified construction, simplified maintenance.

7 dwg

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 fluid flow like a rod, the spring may pick up frost, because water may occur in the oil, and the device will have to be heated during sampling. In addition, the device is installed on a horizontally located section of the pressure pipe, where the multicomponent gas-liquid mixture manages to separate (settle) to some extent, which negatively affects the results of the analysis of the sample.

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

The problem is solved in that the hollow body is a fragment of the pressure pipe, mainly on 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 inner diameter of the hollow body, and the selective chamber is an annular cavity on a hollow body located at the level of the damper and communicated at the inlet with the flow of a multicomponent gas-liquid medium through the intake channels, symmetrical to the axis of rotation of the shutter, and at the output to the shutoff body, 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 the shaft with the shutter are synchronously mated rotation around a common axis and relative axial displacement.

Figure 1 shows a section along the line aa in figure 3; figure 2 is a horizontal projection of the device of figure 1 in the position of ″ Sampling ″; figure 3 is a view along arrow G in figure 1 (view of a vertically located portion of the wellhead fittings, gander, where the device is located); figure 4 is a section but line BB in figure 1 with the open position of the shutter; figure 5 is a section along the line BB in figure 1 with the shutter closed; figure 6 is a section along the line BB in figure 1; in Fig.7 - one of the positions of the device when installing it on a horizontally located section of the pressure pipeline.

The device consists of a hollow body 1 (Fig. 1), which is a fragment of a pressure pipe in a vertical section of wellhead fittings, the so-called gander (Fig. 3). Inside the hollow body 1, a shaft 2 is located, to which the shutter 3 is attached (welded), the diameter of the shutter 3 being smaller than the inner diameter of the hollow body 1, due to which an annular gap 4 is formed (Fig. 2) for passing the mixed flow of a multicomponent gas-liquid medium.

In the hollow body 1, a sampling chamber 5 is provided (Figs. 1, 2) located at the level of the shutter 3 and communicated at the inlet with the flow of a multicomponent gas-liquid medium through the intake ducts 6 located symmetrically to the axis of rotation of the shutter 3, and at the outlet with a shut-off element . In the boss 7 by means of a union nut 8, a housing of the locking device 9 with a guide tube 10 is installed, a two-sided saddle 11 with a gasket 12 (figure 2). Located at the end of the housing 9, the drive screw 13 is connected to the sampling valve 14 with the possibility of rotation relative to each other and joint axial movement due to engagement of the annular protrusion 15 with the corresponding groove in the drive screw 13 (figure 2). And the sampling valve 14 (Fig. 1) and the shaft 2 with the shutter 3 are coupled with the possibility of synchronous limited rotation around a common axis by 90 ° and relative axial movement, which is achieved due to cam engagement (BB, Figs. 4, 5) and spline connection (BB, 6), respectively. At the outer end of the sampling valve 14, an opening 16 is made located in the plane of the shutter 3 (Fig. 1), however, as are the flat sections 17 (Figs. 4, 5) and 18 (Fig. 6) of the valve 14. The device can be installed on a horizontal section of the pressure pipe, for example, the shut-off element "up" (Fig.7) or "down" (not shown) or in an intermediate position. In each case, it is necessary to calculate the optimal layout of the intake channels 6 with their respective sizes.

For sampling a multicomponent gas-liquid medium, it is necessary to install a storage tank (not shown) under the guide tube 10. On the drive screw 13 put on a removable handle (not shown) included in the device, rotate it on the lapel.

At the initial moment, under the action of the friction force between the valve 14 and the drive screw 13 in the area of the annular protrusion 15 (Fig. 2) and due to the spline connection (Fig. 6), the shaft 2 with the shutter 3 will rotate 90 ° and will occupy the closed position (Fig. 5 ), having encountered cams on the way 19. With further rotation of the drive screw 13, valve 14 slots away from the seat 11 (FIG. 6) and the multicomponent gas-liquid mixed mixture passes through the annular gap 4 through the sampling channels 6 into the sampling chamber 5 and through open seat 11 and guide tube 10 - in n storage capacity.

In the process of sampling, the multicomponent gas-liquid flow of the mixture does not stop, but is directed along the narrowed annular gap 4 in the same proportional composition of the components, but at a higher speed, and this happens in the area of the intake channels 6.

After sampling, the drive screw 13 must be rotated by turning, at the same time, the shaft 2 with the shutter 3, turning back 90 °, occupy an open position (figure 4), and the sampling valve 14 is pressed against the seat 11, simultaneously and automatically rubbing against the last one. Such grinding of the valve pair, seat 11 and valve 14 takes place when the device is opened for sampling, which positively affects the reliability of the device as a whole.

If, after taking the sample for unforeseen reasons, the shutter 3 remains closed, which can be judged by the position of the hole 16 (Fig. 1), then after loosening the drive screw 13, it is necessary to turn the sampling valve 14, catching the handle on the hole 16, until the shutter opens 3 and finally close the valve 14 by means of a drive screw 13. During operation, after using one side of the seat 11, the latter is installed by the other side, which indicates the serviceability, rational use of the metal of the seat and, consequently specifically, to increase the reliability of the device.

In this technical solution, the design of the device and its maintenance are simplified. The fact that the working bodies of the device are located directly near the main flow of the medium sampled, indicates its compactness and, above all, the exclusion of cases of freezing in the winter.

Claims (1)

A sampling device for integral sampling of a multicomponent gas-liquid medium, containing a hollow body installed in the pressure pipe of the wellhead fittings, inside 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 a drive sampling valve located inside the body, a handle and a guide pipe, characterized in that the hollow body is a fragment of the pressure pipe mainly on 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 flap mounted 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 level of the flap and communicated at the inlet with the multicomponent flow gas-liquid medium through intake channels made symmetrically to the axis of rotation of the valve, and at the exit with a locking body, moreover, installed in the body of the locking body the drive screw 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 damper are coupled with the possibility of synchronous limited rotation around a common axis and relative axial movement.

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