RU2249694C1 - Sample-taking device - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: device has hollow body mounted in force pipeline, inside of which body tool for controlling flow of multi-component gas-liquid substance is placed, probing chamber with extracting channels, locking tool with handle and guiding pipe, driving valve for picking sample, mounted with possible interaction with spring-loaded rod, placed inside the shaft of flow control tool. Hollow body is a fragment of force pipeline at vertical portion of mouth armature, control tool is made in form of valve of lesser diameter, then inner diameter of hollow body, and probing chamber is a ring-shaped hollow in hollow body, positioned at same level with valve and connected at input to flow of multi-component gas-liquid substance through extraction channels, made symmetrically to rotation axis of valve, and at output - to locking tool, while rod is provided with shelves for multi-start thread of appropriate cross-section, made at shaft on length of no less than quarter of axial step of this thread.

EFFECT: simplified construction, higher efficiency.

3 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 G1), inside which there is a multicomponent gas-liquid medium flow control element equipped with sealing elements, a selective chamber in the form of a sealed spherical segment with intake channels, a shut-off element with a guide tube, a valve sampling installed with the possibility of interaction with a spring-loaded stem. The flow control and shutoff body are individually actuated by separate handles.

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 the wear and tear, add an packing or replace with a new set, which is associated with a shutdown of the well, a violation of the environment at the wellhead, etc.

There is a danger that parts remote from the main fluid flow, such as the stem 38 (Fig. 4), the spring 39, can pick up with frost, because water may also be present 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 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 damper than the inner diameter of the hollow body, and the selective chamber is an annular cavity on the hollow body located at the level of the valve 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 valve, and and output - with the locking body, wherein the rod is provided with projections at respective multiple thread section formed on the shaft over a length at least one quarter of the axial pitch of the thread, and remote from the hollow body of the device are protected from a thermally insulating material cold.

Figure 1 shows the frontal projection of the axial section of the device in the working position; figure 2 is a horizontal projection of the device in section; figure 3 - shaft damper.

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 (not shown). A shaft 2 is located inside the hollow body 1, to which the valve 3 is attached (welded), the diameter of the valve being smaller than the internal diameter of the hollow body 1, due to which an annular gap 4 is formed (Fig. 2) for the mixed flow of a multicomponent gas-liquid medium.

In the hollow housing 1, a sampling chamber 5 is provided, communicated with an annular gap 4 through the intake channels 6, made at the level of the shutter 3 and located symmetrically to the axis of rotation of the shutter 3. A shaft 7 is located inside the shaft 2 with the possibility of interaction with the sampling valve 8 of the shut-off element with on the one hand, and on the other hand, a compression spring 9 installed in the hollow boot 10, protected from the cold by heat-insulating material 11, for example, foam and casing 12.

The sampling valve 8 is a ball mounted in the socket of the head 13 (figure 2) of the drive screw 14 and fixed by compression. The cylindrical section of the head 13 is associated with the corresponding section of the housing 15 of the locking device with a minimum clearance, which ensures a delay in sampling until the shutter 3 is completely closed (Fig. 2). The saddle 16 is placed in the threaded boss 17 (figure 1) and is fixed on the gasket 18 with a union nut 19 through the housing 15 of the locking device with the outlet pipe 20.

The rod 7 is equipped with a pin 21 with protruding ends, forming on the rod 7 protrusions for the corresponding two-way thread in the form of open two-way screw grooves 22 (figure 3) at a length of at least one quarter of the axial pitch of these grooves. L = 0.25 · t, where L is the necessary and sufficient length of the axial component of the screw grooves for opening and closing the shutter, t is the axial pitch of the screw grooves.

The ends of the pin 21 (figure 1) on the periphery are located in the longitudinal grooves 23 of the hollow boss 10, which prevents the rotation of the rod 7 during operation. The intermediate portions of the ends of the pin 21 are in contact with the shaft through two-way screw grooves 22 (figure 3).

To sample a multicomponent gas-liquid medium, it is necessary to install a storage tank (not shown) under the guide tube 20. On the rear end 24 (Fig. 1) of the drive screw 14, put on the handle (not shown) that is included with the device, rotate it on the lapel until a sample mixture appears in the storage tank. This occurs after at the same time the cylindrical section of the head 13 (figure 2) of the drive screw 14 comes out of contact with the housing 15 of the locking device and the shutter 3 closes under the action of the protrusions of the rod 7 on the shaft 2 through its screw grooves due to the potential energy of the spring 9 expended when unclenched.

After taking the required sample volume, the drive screw 14 is screwed to close the valve 8, until it contacts the seat 16, while at the same time the ball 8 of the sampling valve pushes the rod 7 together with the protrusions 21 along the screw grooves 22 (Fig. 3) and opens the shutter 3 by turning it is a quarter turn, which favors the passage of fluid extracted from the well through the hollow body 1 (Fig. 1).

During operation, after using one side of the saddle 16, the latter is installed by the other side, which indicates the rational use of the metal of the saddle 16 (for example, stainless steel) and, therefore, to increase the reliability of the device as a whole.

Elimination of the stuffing box packing on the shaft of the flow control body of a multicomponent gas-liquid medium makes it possible to simplify the design of the device and its maintenance while improving the quality of sampling.

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 fittings, inside which there is a control element for the flow of a multicomponent gas-liquid medium, a sampling chamber with intake channels, a shut-off body with a handle and a guide tube, a sampling drive valve installed with the possibility of interaction with a spring-loaded rod located inside the shaft of the multicomponent flow control element liquid medium, characterized in that the hollow body is a fragment of the pressure pipe in the vertical section of the wellhead fittings, the flow control element of the multicomponent gas-liquid medium is made in the form of a smaller damper than the inner diameter of the hollow body, and the selective chamber represents an annular cavity in the hollow body, located at the level of the valve 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 valve, and at the exit, with a locking member, the stem being provided with protrusions for a multi-thread of a corresponding cross-section, made on the shaft at a length of at least one quarter of the axial pitch of this thread.

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