SU1190015A1 - Arrangement for closing valves of deep-well sampler - Google Patents

Abstract

A DEVICE FOR CLOSING VALVES OF A DEEP SAMPLE, containing a body, a sampling chamber, a cylindrical working chamber with holes in the upper and lower end walls, which communicate its cavity with external space, installed in the working chamber with the possibility of axial movement of the sleeve with a central hole and thickening outside diameter and shchetk, interacting through the hole in the lower end wall of the working chamber with the trigger lever of the valves of the sampling chamber, characterized in that simplifying the design and increasing its reliability by preventing the device from being contaminated by mechanical inclusions, the central opening of the sleeve and the holes in the end walls of the working chamber are provided with annular seals, the working chamber is filled with a gas-liquid mixture, and the stem is made in the form of a differential scale with a ring and an annular the protrusion restricting its movement in the working chamber, and the differential piston is placed in a large section in the opening of the upper end wall of the working whose chambers, and smaller ones - in the central opening of the sleeve, which is installed with the possibility of fixation in the working chamber.

Description

ate

The invention relates to the oil and gas industry, namely, devices for sampling formation fluid in wells, and can be used also in hydrogeological studies.

The purpose of the invention is to simplify the design and increase the reliability of the device by preventing contamination of the device by mechanical inclusions.

The drawing shows a device for closing the valves of the depth sampler, a general view.

The device consists of a housing 1, on which inlet ports 2 are located. In the inner cavity of the housing 1, the upper part of the differential seal 3 is placed with the restrictor nut 4, passing through the gland seal 5 into the working chamber 6 filled with gas-liquid medium, and the lower part of the differential fluid 3 provided with a calibrated tongue 7 to set a certain pressure, passes through the sleeve 8 with the gland seals 9 and 10 located along its external and internal diameters, and then through the hole in the washer 11 with sal a unique seal 12 into the internal cavity of the sub 13, which connects the housing 1 with the sampler 14. The sub 13 contains inlet ports 15 and the trigger lever 16 of the sampler valves 14.

Preparation of the device for operation is performed as follows.

Before lowering the sampler 14 into the well, the trigger lever 16 is installed with the possibility of holding the sampler valves 14 in the lock. With the aid of the sleeve 8, the gas-liquid mixture in the chamber 6 is compressed and, using a calibrated slat 7, a certain pressure is established which is somewhat less than the pressure in the well at the depth of sampling. At the same time, the working pressure is set on a special calibration stand in the laboratory, taking into account

temperature and pressure in the sampling interval. The upper part of the differential pressure 3 is set to limit its stroke with the help of a nut 4 in the event of a significant excess of the specified pressure at the depth of sampling, and the lower part of the differential piston 3 is sealed and isolated from possible contamination of the particles to the sleeve 8 by means of a stuffing box 12, moreover, the lug 1I is mounted on the protrusion of the sub 13, by means of which the device body 1 is screwed together with a sampler 14.

A device for closing the valves of the depth sampler works as follows.

When a given sampling interval is reached, one part of the well fluid entering through the inlet ports 2 acts on the upper part of the differential squash 3, and another part of the well fluid coming in through the inlet ports 15 of the sub 13, under the same pressure acts on the lower part of the differential piston 3 .

When a given sampling depth is reached, the pressure of the well fluid acts on the differential piston 3 with a force exceeding the pressure of the gas-liquid mixture in the working chamber 6, as a result of which the differential piston 3 makes a translational axial movement down and rests on the release lever 16, which releases the depth sampling valve 14 and the sample is isolated from the external space.

Making the rod in the form of a differential pressure gauge with a calibrated pin, the axial movement of which is limited by the sleeve with seals on the external and internal diameters, eliminates mechanical contamination of the device, as a result of which the device can be reused without complete disassembly for washing and cleaning, increases productivity

Claims (1)

DEVICE FOR CLOSING VALVES OF A DEPTH Sampler, comprising a housing, a sampling chamber, a working chamber of cylindrical shape with holes in the upper and lower end walls communicating its cavity with the external space, axially displaced in the working chamber with a central bore and a sleeve thickened along the outer diameter and the rod interacting through an opening in the lower end wall of the working chamber with the trigger lever of the valves of the sampling chamber, characterized in that, in order to simplify To simplify the design and increase its reliability by preventing contamination of the device by mechanical impurities, the central hole of the sleeve and the holes in the end walls of the working chamber are equipped with ring seals, the working chamber is filled with a gas-liquid mixture, and the rod is made in the form of a differential piston with a calibrated scale and an annular projection limiting its movement in the working chamber, and the differential piston is placed in a large cross section in the hole of the upper end wall § of the working chamber, smaller - in the central opening of the sleeve D, which usta- Credited and with the possibility of fixing in the working chamber I *. Ιζ i190015