SU1196497A1 - Sampling device for formation tester - Google Patents

Abstract

SAMPLING DEVICE TO THE PLASTIC TESTER, comprising a housing, a sampling chamber with inlet and outlet channels and valves, concentrically mounted relative to the housing, subs with channels for communicating the sampling chamber with the space inside the subs, that, in order to expand the field of application of the sampler, the chamber with compressed gas is provided in the upper part with diametrically located partitions with the center By the openings and pistons, the rods of which are installed in the central openings of the partitions with the ability to interact with each other and through the upper stem with the sampling chamber, the pistons are installed in the upper part of the sects with S partitions formed by partitions, the piston cavities communicate between (L and with a chamber with compressed gas by means of axial and radial channels made in the rods, and the piston cavities are isolated from the chamber of compressed gas. CD

Description

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The invention relates to the field of the oil industry and is intended to work with formation testers.

The aim of the invention is to expand the field of application of the device by reducing the pressure in the working chamber and the pressure required for control.

Figure 1 shows the proposed device, a General view; Fig, 2 is the same, continuation; fig.Z - shaped groove device,

The sampling device comprises a sampling chamber body (details, 1, 2 and 3) with inlet 4 and outlet 5 channels, sleeve 6 with a shaped groove and a separating piston 7 in the housing yctaiiOBJienHMe and valve 8.

Between channels 4 and 5 on the outside. The surface of the sampling chamber body is made of an annular pad A enclosed by interconsolidations U and 10. The housing of the sampling chamber (parts 1, 2 and 3) is housed in a protective sleeve 11, in which a clamp 12 is installed, interacting with the shaped groove, and holes 13-15 are made . The protective sleeve 11 together with the housing of the sampling chamber is located in the cavity of the subs 16-18 and the casing 19. The sub 16 has cables 20. The sub 18 has radial holes. 21.

In the sub 16 and the housing 22 there is a gas chamber B, divided by partitions 23-25 in the upper part. Pistons 26 to 28 are mounted between the partitions 23-25 relative to them in the extreme upper position and in the lower part of the body there are a check valve 29 and a plug 30. The pistons 26-28 are made with a common axial channel 31 and radial; channels 32-34 connecting the main working chamber B with additional cavities D, D and E formed by the lower surfaces of the pistons and the upper surfaces of the partitions. In addition, between the upper surfaces of the pistons and the lower surfaces of the partitions 23-25 there are cavities of reduced pressure Ж, 3 and И, isolated from the gas pressure in chamber B and the fluid that fills the well bore.

The sampling device works in the layout with the reservoir tester as follows.

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Before the device is lowered into the well, the device is assembled so that the pistons 26-28 are located in the extreme upper position relative to the respective barriers 23-25 of chamber B. Then the gas chamber is filled through the backflow 1 valve 29 with gaseous substance (for example, nitrogen) to the calculated pressure. At the same time, additional cavities D, D, and E are filled with nitrogen.

In the process of launching test equipment into the well, the total

15 force from the action of nitrogen pressure on the pistons exceeds the force from the action of hydrostatic pressure, washing liquid on the annular pad A. Therefore, the holes 4 and 13,

20 5 and 15 are in the combined position.

After the test equipment has reached the test interval,. installing the packer, close the balancing valve, and open the receiving valve of the reservoir tester (not shown), the reservoir fluid from the reservoir enters the cavity of drill pipes through the annular space of the cavity, ,, nickname 22, channels 20 of the sub 16, annular space of the cavity of the sub 17, holes 4 and 13, - sampling chamber K, holes 5 and 15, the annular space of the cavity of the casing 19 and the holes L.

When a calculated overpressure is created in the annulus of a well, the force acting on pad A in chamber B increases and moves the body of the sampling chamber to the lower position, where the holes 13 and 4.5 and 15 are disconnected, and the sleeve 6 moves down to the point n shaped groove with retainer 12. The sampling chamber is closed, blocking the access of reservoir fluid to the drill pipe cavity and pressure gauges installed below the sampling device, record the reservoir pressure recovery curve.

When relieving excessive pressure in the annular space of the well, the body of the sampling chamber returns to its initial upper position,

55 The access to the reservoir fluid in the drill pipe cavity is reopened.

Returning the body of the sampling chamber to the upper position method. , 3., N

The pistons 26-28 work on the bottom surface of which is acted upon by the pressure of a compressed gas in cylinder B. An additional force is created by the operation of the isolated cavities with reduced pressure and I. At assembly of the device, atmospheric pressure is established in them. In the well, as a result of an increase in temperature, the maximum increase in pressure in these cavities is possible by a factor of 1.2-1.4.

However, when opening the sampler, when the pistons 26-28 are displaced to the lower position, the volume of these cavities increases tenfold. Thus, a deep vacuum is formed in them, which makes it possible to additionally develop a force of up to 500-700 N on each piston when the sampler is re-closed.

The effect of this additional force during the transfer of the sample chamber makes it possible to reduce the pressure of compressed gas in chamber B in comparison with known devices.

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A sample of formation fluid is cut off in the sampling chamber after the end of each open test period, the number of which is set before the test begins.

After a predetermined number of open test periods have been implemented, the sampling chamber is closed in the closed position, the latch 12 reaches in the figure groove 6 the position of

The body of the sampling chamber (parts 1-3) is designed in such a way, 15 which ensures the extraction of the sampling chamber of the boron chamber without first reducing the pressure of nitrogen from the cavity B of the gas cylinder.

20 The reservoir tester with the proposed device provides work under optimal nitrogen pressure and optimum overpressure without limiting the hydrostatic pressure in the annular well space.

Claims (1)

A SAMPLING DEVICE FOR A PLASTER TEST, comprising a housing, a sampling chamber with inlet and outlet channels and valves, concentrically mounted relative to the housing sub with channels for communicating the sampling chamber with the space inside the sub, a chamber with compressed gas in communication with the end wall of the sampling chamber, characterized in that, in order to expand the scope of the sampler, the chamber with compressed gas is provided in the upper part with diametrically located partitions with a central and holes and piston rods are fitted in the central holes of the partitions to interact with each other and with the stem through the upper sample chamber, wherein the pistons are installed in the upper part _with sec- tions formed by partitions, ® subpiston chamber communicated with each other and with the chamber with compressed gas with the help of axial and radial channels made in the rods, and the supra-piston cavities are isolated from the compressed gas chamber.