SU1002558A2 - Apparatus for transmitting to surface a signal of produced depression when working with formation tester - Google Patents

Description

The invention relates to well testing, in particular to devices for testing formations with tubular pipe testers.

According to the main auth. No. 883379, a device for transmitting a depression signal to the surface and, when working with a reservoir tester on pipes, consists of a housing with a partition, in which a check valve is installed, a floating piston connected to the pipe column, a sub with a stepped rod forming a housing and a piston an annular chamber, separated by a partition, and a control mechanism including a spring-loaded slide valve with an annular groove and seals. To isolate the control mechanism from contact with the borehole fluid, the control mechanism is provided with a sleeve with an axial channel and installed in the partition, the latter has radial channels, and a spring-loaded spool is installed inside the sleeve, the space of its upper end is communicated through the partition partition with the annular space, and the space under. 1 bottom end - with an annular chamber above the piston. In addition, the sleeve

provided with an elastic membrane installed in the channel, which communicates the space above the upper end of the spool with the tube space fl.

When operating the device in various depths as well as in directional wells, it is not always possible to obtain the desired effect. For example, especially in deep

10 inclined wells, to compensate for the significant axial deformations of the pipe string, the tool hangs on the walls of the well, the device requires maximum working stroke.

15

At the same time, in shallow wells, when the device is triggered, there is a loss of axial load on the packer (in some cases significant), which can lead to

20 tightness of packing and, accordingly, to poor-quality performance of a research operation.

In some cases (deep and offshore wells), the device’s travel should be maximized, and in others (shallow wells) - minimum. Therefore, an important requirement for a device when operating in a variety of well conditions is to ensure

preliminary adjustment of the length of the stroke.

The aim of the invention is to improve the reliability of the device.

The goal is achieved by the fact that the device for transmitting a depression signal to the surface when working with the Layer tester is equipped with an adjusting nut installed on the stepped stem (with a pin).

1 shows the proposed device, a front view with a partial section; Fig 2 is a control mechanism.

Device mocks from upper transducer 1, rods 2 and 3, case parts, including stop 4, middle sub 5, bottom sub 6, spline connection 7 between stop 4 and stem 2, check valve including spring 8, ball 9, saddle 10, floating the piston 11, the control mechanism 12,

The control mechanism consists of a sliding sleeve 13, in which it is mounted on an elastic membrane 14.

The sleeve 13 is attached to a massive bulkhead that separates the annular chamber between the housing and the stem.

chambers a and B. On the outer surface of the sleeve there are three rows of seals and two rows of radial holes 15 and 16, and these holes are isolated from one another by a lower seal 17 of the movable spool 18 pressed to the top by a spring 19. The slide spool 18 is limited to the bottom the ledge on the rod 20 and is adjusted by the nut 21. The upper end of the spool 18 continuously transmits the pressure of the annular space through the channel 22, the elastic membrane of the wound 14, the channel 23, and the lower end of the spool 18 is permanently communicated with the in-pipe space .

Chambers "and b, as well as the cavity between the spool 18 and the elastic membrane 14 are filled with lubricating fluid. For — messages of cameras O. and 5, channels 24 and 25 are made in the device,

The stepped rod 2 is provided with an adjusting nut 26, which is associated with the rod by a stop thread and is secured against self-unscrewing by a pin 27.

In a test instrument assembly, a device is installed between the main valve of the tester and the top packer,

During the descent and ascent of the test tool, the pressure above and below spool 18 is the same and equal to hydrostatic. Therefore, the spool

18, the action of the spring 19 is pressed upwards and the seal 17 separates the rows of holes 15 and 16, which are part of the channel connecting chambers a and B. .

The device can not be compressed even with large axial loads, as in a chamber d there is a closed volume of liquid. After the packing and opening of the valve, the tester in the test area, and therefore in the lower part of chamber B, creates a reduced pressure due to the floating piston 11. A higher annular pressure acts through the radial channel 22, the elastic membrane 14, the channel 23 to the upper end of the spool 18 and displaces it up to the stop of the rod 20 so that the holes 15 and 16 are communicated (in the annular gap between the seals of the spool 18). The lubricating fluid from the chamber a at high speed under pressure rushes through the channel 24 to the annular gap between the sleeve 13 and the middle sub 5, through the holes 15 and 16 again along the annular gap of the junction 25 into the chamber 5.

The device is instantly compressed by the length of the working contact of the nut 26 with the stop 4, which is easily observed on the surface and a sharp fit of the drill pipe, and a change in weight on the indicator of the drilling rig.

After the test, when the equalizer valve of the tester is open, the device is freely stretched, as the liquid flows freely from cameo 5 through the non-return valve {parts 8'9, 10) into the chamber d. .

To perform work in another well, the adjusting nut is moved to the position corresponding to the optimum one for the well.

Claims (1)

Invention Formula A device for transmitting to the surface a signal about creating a depression when working with a formation tester according to auth.St. No. 883379, distinguished by the fact that, in order to increase its reliability in operation, it is equipped with an adjusting nut mounted on a stepped stem with a locking pin. Sources of information taken into account in the examination 1, USSR Author's Certificate S 883379, cl. E 21 V 49/00, 1980 (prototype). 1