SU441400A1 - Hermetic core sampler - Google Patents

Description

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The invention relates to devices used in gas metering of wells by core and for testing oil and gas that is opened by a well in a mountain, namely to devices for hermetic coring from wells.

A hermetic core sampler is known, comprising a drive part, a core receiving chamber, a drill bit, a core device, a lower and upper sealing elements and a bellows.

The aim of the invention is to improve the reliability of the sealing of the sample with the possibility of separating the core receiver chamber from the core sampling chamber without disturbing its tightness.

For this, the core gas sampler is provided with a sleeve with an axial bore, on the outer end surface of which a bellows is mounted, the other end of which is attached to the valve seat of the upper sealing device, the axial bore of the bushing communicating with the inner cavity of the core receiver and bellows.

The drawing shows the described hermetic core sampler at the time of completion of sealing before raising it to the day surface, general view.

Core pick-up chamber consists of a bottom sealing element 1, core2

device 2, core tube 3, separator 4, sleeve 5, bellows 6 and upper sealing elements including spring 7, retaining ring 8, valve seat 9, valve 10, nut II, rubber nipple 12 and sleeve 13. The drive part consists of drill bit 14, security sleeve 15, support 16, flap 17, spacer sleeve 18. guide sleeve 19, pipes 20, pins

21, adapter 22, bushings 23, keys 24. spindle 25, pipes 26. springs 27, piston 28, balls 29, ball 30, pipes 31. adapter 32 and sleeve 33.

The porous chamber is connected to the drive part by means of pins 21. included in the longitudinal grooves on the core tube 3, and another can be replaced for subsequent sampling of the core. The sleeve 5, the axial hole of which is protected from core filling with separator 4, is connected to the core tube 3 with one side and the bellows 6 with the other side and the valve seat 9 fixed to the core tube 3 that is movable relative to the core tube 3. Places

the connections of the bellows 6 with the sleeve 5 and the valve seat 9 are sealed with rubber rings. Spring 7, resting one end against the adjusting nut 11, and the other end, in sed: 10 9 valves, through the rubber ring presses

valve 10 to the saddle 9. Through the axial bore

sleeve 5 the inner cavity of the core tube is connected to the bellows 6. The axial hole in the valve 10 is closed with a rubber washer 12, pressed by the sleeve 13.

The core sampler is lowered into the well for core sampling on the drill pipe. During the core sampling process, the transfer of torque from the drill pipe is approached through adapter 32, spindle 25, sleeve 23, through the key connection of the latter to adapter 22, then to pipe 20 and to the drill tip 14. The flushing fluid flows to the bottom hole through the internal the cavity of the parts 32, 28, 25, through the holes in the part 25, through the annular space between the parts 23 and 26, through the slots in the part 22, the holes in the parts 19, 16, 14.

In the core sampler prepared for the selection of keria, the flap 17, on which the lower sealing element 1 is fixed to seal the inlet of the core receiver chamber, is retracted against the wall of the pipe 20 and is held in this position by the core receiver 3.

The drill bit 14 and associated parts 20, 15, 16, 17, 32, 22, 26, 27, 25, 33 are held in a raised position relative to the core tube in position by two balls 29 which fall in through the holes in the spindle 25. bushings 33.

Under the action of the axial pressure generated by the weight of the parts of the core gas collector and drill pipes, the spring 7 and the bellows 6 are compressed until the sleeve 23 stops against the end of the ring 8 and the nut 11 into the end groove of the sleeve 5. As a result, between the valve 10 and the valve seat 9 connected to the bellows is formed by an annular gap for the passage of the washing liquid when the core receiver tube 3 is filled with a core. After the interval corresponding to the length of the core lifter pipe 3 has been completed, drilling is stopped, and a steel ball 30 is thrown from the surface into the drill pipe string to drive the bottom sealing element 1, and after immersion it sits on the saddle 28.

If the flushing fluid continues to be pumped by hydraulic force, the piston 28 will move to the lower position. Without stopping the pumping, the core sampler is raised above the face. In this case, the balls 29 fall on the piston 28, the spindle 25 and the sleeve 33. As a result, the sleeve 33 will also move to the lower position under the action of hydraulic force, dragging the parts 26, 22, 20 and 14 associated with it. Details 26, 22, 20 and 14 of the core sampler are moved to the lower position until the sleeve 33 fits into the sleeve 23. The moment of dismemberment of the core gas sampler is characterized by a pressure drop on the pressure gauge of the flushing pump, as the sleeve 33 moves downwards and opens the holes in the pipe 31 through which the washing pump fluid flows into the annulus.

After dismemberment, the core lifter tube 3 is raised above the flap 17, which, under the action of coil springs

is lowered onto the support 16. At the beginning of the dismemberment, the lower end of the core receiver tube leaves the sleeve 15, exposing the core device 2, and the valve 10 is closed, since the axial pressure from the end

sleeve 5 is removed.

To seal the core sampler, it is again lowered onto the face. In so doing, the core-borne pipe is lowered onto the lower sealing element and seals the inlet. The core sampler then rises to the day surface. At the moment of lifting, the valve 10 under the action of the spring 7 sits on the saddle 9, seals the core tube, and the bellows can freely expand under the action of pressure inside the core tube. The expansion of the bellows is completed when the nut 11 is pressed into the ring 8. The stroke of the bellows is selected depending on the expected gas pressure and gas saturation of the core being taken. After removing the core receiver from the core sampler, the chamber is placed in a vertical position and is punctured with an injection needle through a rubber washer 12.

free gas recovery and core degassing.

Subject invention

A hermetic core sampler including a drive unit, a core receiver chamber, a drill bit, a core device, a lower and upper sealing elements and a bellows, characterized in that, in order to improve the reliability of the sealing of the sample taken, it is equipped with

a sleeve with an axial bore, on the outer end surface of which there is a bellows, the other of which is attached to the valve seat of the upper sealing device, the axial bore of the sleeve

reported with the internal cavity of the core tube and bellows.

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