SU899846A1 - Device for taking oriented core - Google Patents

Description

one

The invention relates to mining, to means for drilling wells with coring and indicating its position in space.

Prior art core sampling devices are known in which an oriented tag is applied to the surface of a special projectile before drilling 1.

It is also known a device comprising a housing, a locking mechanism connected to the housing for azimuthal fixing of the device in the borehole, a crown, a crown rotation drive, a core receiver tube and a core gauge kinematically connected with the rotation drive 2.

When drilling with a known device, a reduction in the core section occurs as a result of drilling a marking channel along its length. As a result, the strength of the core decreases and during long-term interaction with the device, it collapses, interposes the device and prevents further drilling.

The purpose of the invention is to increase reliability by preventing the destruction of the core.

This goal is achieved by the fact that in the known device the core marker is made in the form of a percussion mechanism with a spring-loaded striker installed in a radial hole in the wall of the core tube, and a drummer in the form of an eccentric protrusion on the inner surface of the body, while the core tube is connected to the crown and the rotation drive .

FIG. 1 shows the device, a general view; in fig. 2 - locking mechanism of the device in the working position.

The device includes a housing 1 with a drummer in the form of an eccentric protrusion 2 in its lower part 3. The protrusion 2 can be you, 5 complete in the form of a rod or a spring-loaded element rigidly fixed on the inner side of the case. The upper end 4 of the housing 1 is rigidly connected with a locking mechanism 5, including spacer carriages 6 mounted on the springs 7, and

20 shaft 8. The lower end of the shaft 9 is spring-loaded with a spring 10 relative to a core-receiving pipe 11 and has a splined connection 13 with the upper part 12 of the latter.

The lower end 14 of the core-borne pipe 11 is equipped with a rock-breaking crown 15. 11p; the crown rotates from ba.a 8 through the core tube 11. In the off position, the body 1 is fixed with the shaft 8 by the stop 16. The upper part 17 of the shaft 8 has a stop sleeve 18 to extend the springs 7. Carriages 6 are connected to the springs 7, which, when moved apart, fix the housing 1 relative to the walls of the well. The lower part 14 of the core receiver tube 11, at the level of the projection 2, has a radial hole 19 in which the core body 20 is located.

The core block 20 has the possibility of free movement along the opening 19 perpendicular to the axis of the core-receiving tube 11. The end 21 of the core block 20, directed towards the inside of the core-receiving pipe 11, is pointed. The opposite end 22 extends from the core-receiving tube 11 and has the ability to interact with the protrusion 2 while rotating the core-receiving tube 11 inside the housing 1. The core body 20 can be freely inserted into the hole 19 of the core-receiving tube 11 or connected to it by the spring 23. The head 20 of the spring 23 and the drummer in the form of a protrusion 2 form the core marker mechanism.

A device for selecting an oriented core operates as follows.

A device for sampling an oriented core is lowered into the well on drill pipes (not shown) attached to the upper part 17 of the shaft 8. Next, the device is oriented in the well and is set by a core 15 of the core tube II to the bottom of the well. When the drill pipes are subsequently supplied to the face, the shaft 8 with its lower end 9 compresses the spring 10 and moves in the clamp connection 13. With the compression of the spring 10, the axial load is transmitted through the end face of the slots and core tube to the crown 15. Simultaneously with the downwardly feeding of the shaft 8, the stop 16 comes out of engagement with the upper part 4 of the housing 1, and the spacer part 18, moving downwards, moves the springs 5, which in turn, press the spacer carriages 6 to the walls of the well and fix the body 1 in an oriented state relative to the borehole walls. At the same time, the locking carriages 6, without allowing the body to rotate relative to the walls of the well, allow the device for taking an oriented core to move along the walls of the well.

When rotating and feeding the drill pipes downward, the crown 15 drills a core sample from the rock formation at the bottom of the well. Together with the core lifter pipe 11, the core hammer 20 rotates during core drilling as well. At this, the hammer head 20, due to the centrifugal forces or the additional action of the spring 23, tends to exit the core receiver 11. end of 22

will not reach the inner wall of housing 1 and jump onto eccentric protrusion 2. Upon impact of projection 2, the core firing pin 20 bounces into the core receiver tube 11 and with its sharp end 21 rods the core wall.

The marking of the core wall occurs at each revolution of the core-receiving tube 11. In the process of dredging and core drilling, the marks are placed

along core core one over the other. The proposed device for the selection of oriented cores is simple in design and is distinguished by the reliability of operation of both individual units and as a whole. Thanks

applying marks on the core generator without long-term force action on the rock sample and without reducing its cross section, the latter can be preserved from destruction and, consequently, selected a high-quality sample. The design provides the possibility of creating devices for the selection of high-quality oriented core, even for wells of small diameters (less than 76 mm).

Claims (2)

1. USSR author's certificate number 230759, cl. E 21 B 47/022, 1966. 2. USSR author's certificate for application number 2690123 / 22-03, cl. E 2G 25/16, 1978 (prototype).