SU883321A1 - Device for taking oriented core - Google Patents

Description

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FIELD OF THE INVENTION The invention relates to mining, to tools for drilling with coring.

Prior art core sampling devices are known. a pipe with an adapter and a crown, a mechanism for marking the core, and an apsidal plane position sensor 1.

When such a device is drilled on flooded rocks, where individual core pieces can be displaced, there is a loss of information due to the inability to restore the original core position relative to the apsidal plane, which is fixed once at the end of the voyage.

More perfect is the device, where the position of the apsidal plane is fixed many times as the core deepens into the pipe.

Such a device includes an outer tube with an adapter and a crown, an inner core tube, a mechanism for applying a mark on the core, and a sensor for positioning the apsidal plane with a mechanism for repeatedly marking and clamping the marking element in the gap between the soft plate. metal and movable heel on a spring-loaded rod 2.

However, the mechanisms used in this device contain a large number of moving parts relative to each other, which ultimately significantly complicates the design and reduces the reliability of the device.

The purpose of this invention is to simplify the design and increase reliability.

This goal is achieved by the fact that in the device the marking element is designed as a group of balls of different diameters, the rod is made with a discharge channel for moving the balls with an exit into the nip gap.

The fifth clamp and a plate of soft metal f are located inside the corecore pipe, which is spring loaded with the possibility of maximum displacement relative to the outer pipe.

Figure 1 shows the device, cut; in FIG. 2, a section A-A on ig.1.

The device for sampling the oriented core includes a cam ufta consisting of the upper coupling half 1. and the lower coupling half 2 with the sealing lip 3 and the stem 4, with the thrust bearing 5 fixed on it, the middle adapter 6 with two sealing cuffs 7. The apsidal position sensor contains a rod 8 with a spring 9, an annular pin 10 and a marking element I1 placed in the gap between the fifth 10 and a plate 12 of soft metal,

A core receiver tube 13, equipped with a cutter 14, a scale 15, a sliding bearing 16 and a spring 17 placed under the lower part 18 of the middle adapter 6 in the outer pipe 19, form a mechanism for applying a mark on the core. At the lower end of the pipe 1.9, the crown 20 is screwed with a core ring 21. In the rod 8, a discharge channel 22 is made, having an exit 23 into the gap between that 10 and the plate 12.

The device works as follows.

The marking element 1 1 is a group of balls thrown through pipes through channel 22. Each ball has a diameter greater than the previous one. When setting on the bottom and rotation of the drill bit and the upper coupling half 1, resting against the lower coupling half 2, rotates relative to it until it takes up such a position in which the cams are closed. Through the cam coupling halves 1 and 2, torque and axial load are transmitted to the bottom. In this case, the lower end of the rod 4 moves the rod 8, compressing the spring 9. As a result of this, the first 10 will move downward. During the drilling process, the cutter 14 of the core tube 13 causes a spiral furrow on the core surface, due to

rotation of the inner core tube 13 under the influence of friction forces on the surface of the core ring. At a certain point in time after the core has been drilled

the required length (for example, 0.250, 5 m) stops drilling and supply of washing fluid. Through a string of drill pipes, a ball 11 with a diameter of 3 mm is thrown into the device. The ball 11 enters the gap between point 10 and the plate 12, occupies a position corresponding to the apsidal plane of the well. The gear is lifted 5-10 cm above the workpiece, as a result of which the first 10 rises up, the ball 11 is impressed into the plate 12, leaving a trace on it corresponding to the apsidal plane, then the spring 17 is compressed, the core receiver 12 moves upwards, and the tool 13 causes a vertical groove on the surface of the core, oriented relative to the apsidal plane of the well. After 0, the drilling process continues. At certain points in time, the orientation cycle is repeated by throwing balls of larger diameter (for example, 6.9 and 12 mm), which leave a larger footprint and prevent re-imprinting of previously blasted balls of smaller diameter. When lifting the projectile from the bottom, the cam half coupling 1 is disconnected from the coupling half 2 and rotated by the twist angle of the drill pipe string. At the same time, the rod 4 moves upward, freeing the rod 8, which under the action of the spring 9 moves upward and presses the ball I1 (the last one abandoned in the core guide and having the largest diameter) to the plate 12. In the process of lifting the projectile and the cam half coupling 1 and 2 remain open, since the reciprocating movements of the device relative to the drill pipe string under the action of the forces of friction and inertia are limited by the asymmetrically arranged cams of the coupling half 1 and 2, which excludes the possibility of misalignment of the last o from balls 11.

After lifting the core to the surface from a scale of 15 according to the marks of different diameters of the plate and 12, readings are taken for each of the balls and correlated with sequentially extracted core samples and having a vertical groove, followed by 5 corrections after joining the core connection.

Claims (2)

The adjustment of fingerprint readings is made by introducing five corrections equal to the half-sum of the diameter of the balls that were in the annular gap at the moment of orientation (the maximum error is possible). At that, the reading of the fingerprint of a smaller diameter is not corrected and the determined apsidal line at the core corresponds to after docking the entire core with the dipsial lines drawn on other samples. Thus, the entire core obtained in the drilling process is oriented. Claims An apparatus for sampling an oriented core comprising an outer tube with an adapter and a crown,. an inner core tube, a core tag mechanism, and a sensor for positioning the apsidal 1 plane with a mechanism for repeatedly marking and clamping the marking element in the gap between the soft metal plate and the movable spot on the subshell, which is different so that with. In order to simplify the construction and increase the reliability of operation, the marking element is designed as a group of balls of different diameters, the rod is made with a discharge channel dp of moving the balls, with a exit into the nip gap, and a pin of the clamp and a plate of soft metal are located inside the core receiver spring-loaded with the possibility of longitudinal displacement relative to the outer pipe. Sources of information taken into account in the examination 1. The author's certificate of the USSR No. 343029, class E 21 V 49/00, 1969. 2. USSR author's certificate for application number 2811761 / 22-03, class; E 21 V 25/16, 1979 (prototype).