SU1490252A1 - Sealed core-taking device - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to mining and is intended for drilling wells. The purpose of the invention is to increase the reliability of work. For this purpose, a movable closure sleeve 21 with a longitudinal through groove 25 and an overflow channel 22 is fixed in the piston 8. It has a saddle 23 for the relief valve 24. In the groove 25 a pin 26 is mounted, which fixes the upper 5 and the lower 6 valves on the sub 3. The locking element of the fixing unit of the piston 8 is formed by a support for the rotation of the core receiver 4. The locking elements are made in the form of cylindrical rods 14 with a ball at one end and a cone at the other. The piston 8 has lateral guide holes that are oriented upwards at an angle to the longitudinal axis. Under the action of the balls, the rods 14 move into the annular recess, and the balls enter the holes. The piston 8, together with the core receiver 4, is moved down by the pressure of the drilling fluid and its own weight. The piston 8 slides over the valve 5, sealing the upper part of the core receiver 4. By turning, the valve 6 seals the lower part of the core receiver 4. Simultaneously with the rotation of the valve 6, the core is separated from the bottom. 4 il.

Description

valve 24. Pin 26 is placed in groove 25, which secures the upper 5 and the lower 6 valves to the sub 3. The locking element of the fixing unit of the piston 8 is formed by a support for the rotation of the core receiver 4. The locking elements are made in the form of cylindrical rods 14 with a ball at one end and a cone at the other. The piston 8 has lateral guide holes which are oriented upwards at an angle to the longitudinal axis. Under the influence

the balls 14 are moved into the annular recess and the balls enter the holes. The piston 8, together with the core receiver 4, is moved down by the pressure of the drilling fluid and its own weight. The piston 8 advances on the valve 5, sealing the upper part of the core receiver 4. By turning, the valve 6 seals the lower part of the core receiver 4. Simultaneously with the rotation of the valve 6, the core is separated from the bottom. 4 il.

The invention relates to mining, in particular to devices for drilling wells with coring and preservation of the formation medium.

FIG. 1 shows a hermetic core sampler, a section; in fig. 2 - piston fixation unit in the cylinder; in fig. 3 - upper valve in the process of drilling; in fig. 4 - hermetic core sampler in position before removal from the well, general view.

The hermetic core sampler comprises a housing 1 with a crown 2 and a translation with NICOM 3 for connection with a drill pipe string (not shown). The body 1 is fitted with a core receiver 4 with top 5 and bottom 6 sealing valves, as well as with a mechanism for moving the core receiver and valves, which is formed by cylinder 7 in adapter 3 with a piston 8 made with side guiding holes 9 and connected to the core receiver. 4. The piston 8 is fixed in the cylinder 7 by a fixing unit made in the form of a movable sleeve 10 having a bypass channel 11 with a saddle 12 for the relief valve 13 and locking elements — cylindrical rods 14 with a ball 15 at one end and a cone 16 at the other. The locking elements are located in the lateral straightening holes 9 of the piston 8 and interact with the annular recess 17 of the cylinder 7, while the guide holes 9 are oriented upward at an angle to the longitudinal axis, and the locking elements themselves form a support for rotation of the core receiver.

The sleeve 10 is held in its original position in the central canape 18 with a shear pin 19. In the same canape

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18 piston 8 with the same shear pin 20 fixed movable locking sleeve 21 with the bypass channel 22, having a saddle 23 under the discharge valve 24, and with a through longitudinal groove 25.

The upper valve 5 is fixed on the sub 3 by a finger 26, placed in the groove 25 of the sleeve 21, while the finger 26 passes through the holes 27 in the piston 8 and interacts with the annular recess 28 of the cylinder 7.

The valve 5 has an o-ring 29 with a coaxially underlay {outer ring 30 and 31 and a high-pressure valve 32. The valve 5 interacts with the cylindrical hip 33 of the core receiver 4. The lower part of the core receiver 4 has a shank 34 in which is located on the axis 35 of the valve 6, ball-shaped with a hole 36 for the passage of the core. A valve assembly is installed above the valve 6 in the shank 34, which contains a sealing sleeve 37, which interacts with the valve 6 by means of protrusions 38, which, when the valve 6 is rotated 90, sink into the grooves 39 under the action of springs 40, inside which there is a core-hub 41. is kept from turning by the shear pin 42. The turning unit of the lower valve 6 has stops 43, which interact with the Kai-m 44, mounted on the valve 6, which are mounted on the sleeve 45 movable relative to the shank 34 and placed in the guide nut 46. Vise sleeve 45 is held in shank 44 by a moving finger 47.

 For fixing the core receiver and valves in the closed position and signal5

To lick about this, the sleeve 10 has an annular recess 48, and a cylinder 8 has an annular recess 49 and drain holes 50.

Hermetic core sampler works as follows.

The coring tool is connected by means of the sub 3 to the drill string and lowered into the well to the bottom. When the flushing is switched on, the drilling fluid reaches the bottom of the well through the central channel 18 of the hole 27 between the body 1 and the core receiver 4, as well as through the cavity of the cylindrical key 33 inside the core receiver. The valve 24 is lowered into the drill pipe string, which falls onto the saddle 23 and closes the orifices 27. Due to the increase in pressure, the pin 20 is cut off, the movable closure sleeve 21 moves downward, closing the core cavity 4. The core is drilled by rotating the housing 1 with a drill bit 2, the core being drilled enters the core receiver 4. The drilling fluid flows through the groove 22, the housing 1 rotates relative to the core receiver 4 on the rotation support. After the core receiver is filled with 4 cores, a valve 13 is thrown into the drill string, which falls on the saddle 12 and closes the channel 11. By increasing the pressure of the drilling fluid in the drill string, a force arises, under the action of which the movable sleeve 10 moves and moves down. The annular recess 49 coincides with cylindrical rods 14, which under the action of the balls 15 moves into the annular recess, and the balls 15 enter into the guide holes 9, the piston 8 together with the core receiver 4 moves downwards under the action of the drilling fluid pressure and its own weight. The upper sealing valve 5 is held by a pin 26 in the annular recess 28 of the cylinder 7, and the piston 8 is pushed by a cylindrical bolt 33 onto the valve 5 by sealing the upper part of the core receiver 4. At the same time, the shank 34 moves relative to the sleeve 45, the stops 43 act on the notches 44 of the lower valve 6, under impact force

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pin 42 is cut off and valve 6 rotates 90 °. The protrusions 38 enter the grooves 39, the sealing sleeve 37 interacts with the surface of the lower valve 6, sealing the lower part of the core receiver 4, simultaneously with the rotation of the lower valve 6, the core separates from the bottom. In the lower position of the core receiver 4, the balls 15 of the piston 8 enter into the annular recess 49 and side of the piston 8 from moving upwards. The solution drains into the drain holes 50, and a pressure drop is observed on the surface.

Claims (1)

Invention Formula 0 five 0 five 0 five 0 five A hermetic core sampler, comprising a housing with a crown and a sub for connecting to the drill string, mounted in a housing on a rotation support, a core receiver with upper and lower sealing valves, and a drive mechanism for moving the core receiver and valves with a cylinder in an adapter having a piston connected to the core receiver, worked as a piston, worked as a piston, made a piston connected to a core receiver, and a cylinder connected to the core receiver has an adapter connected to a core receiver. lateral guide holes, a piston fixation unit in a cylinder with a movable bushing, having an overflow channel with a saddle for a waste valve and with stop elements, placed in the side guide holes of the piston and interacting with the annular undercut of the cylinder and the movable sleeve, characterized in that, in order to increase reliability, it is equipped with a movable stop sleeve fixed in the piston with a longitudinal through groove and a bypass channel having a saddle for the discharge valve , the upper valve is fixed on the adapter with a finger, placed in the through groove of the movable locking sleeve, and the rotation support of the core receiver is formed by locking elements of the piston fixing unit, while the locking elements are made in the form of cylindrical rods with a ball at one end and a cone at the other, and the side guide holes of the piston are oriented upwards at an angle to the longitudinal axis. thirty. FIG. 3 Phi-g.