SU912911A1 - Device for raising core from well - Google Patents

Description

one

The invention relates to geophysics, namely, to geophysical surveys of diamond drilling inclined wells.

A device for lifting a core from a kernoscope well l is known,

A disadvantage of the known device is that all the core drills are lowered into the well with the aid of a drilling tool, and one or two eccentrically located holes are required to obtain an oriented mark at the bottom of the well.

The closest in technical essence to the present invention is a device for lifting cores from wells, containing an inclinometer with an internal frame deflection and a seal 2.

However, the known device, due to its design features, allows to obtain a seal at the bottom of a well only in a non-magnetic environment.

as well as measuring azimuth of a well. In addition, to obtain a measurement of the azimuth of the well and the apsidal plane in the sampling interval of an oriented core sample in the anomalous geomagnetic field, it must be lowered onto the oriented string of drill pipe, which is practically impossible to do with a 59 mm diamond bore hole with an outer diameter of drill bit 48 mm and. through hole internal hole mm at depths of wells 1500-2000 m

15

The purpose of the invention is to obtain oriented printing of the bottom hole in the anomalous geomagnetic field and the subsequent lifting of the oriented core sample.

20

Claims (2)

The goal is achieved by the fact that the device is equipped with an external cylindrical orientator, which is rigidly 39 connected by means of a threaded portion with an inclinometer body and a seal. The outer orientator of the inclinometer contains a lead eccentric balance fixed in the inner part of the case, and a part of the case opposite to the balance facilitated by perforation. FIG. 1 shows a device for lifting the core from the wells, a general view, in Fig. 2 a device for the operation of a well; in fig. 3 is a laboratory instrument (table) for examining oriented core samples. In the device, the drummer with the seal 1 is fixed in the housing 2 and with the aid of a adapter it is attached to the shock absorber of the inclinometer 3, for example IG-50. Against the inclinometer sighting line, there is a sighting line on both the adapter and seal 1. Gyroscopic inclinometer 3 allows measuring the inclination, azimuth and exact depth of the oriented core in wells located in the anomalous geomagnetic field at a distance of 1015 cm from the print. The orientation of the hull of the IG-50 gyroscopic inclinometer consists of two parts: the upper perforated 5 to facilitate and the lower 6 utensil of lead ballast 7 In the lower part there is a thread through which the orientator is connected. to the head of the inclinometer 3- In the center of the orientator there is a central chute where logging cable 8 passes. Lead ballast 7 of the lower part 6 of the orientator constantly holds the IG-, 50 inclinometer body in one position relative to the axis of the well. The device works as follows. After connecting to the logging cable 8 by means of a logging station (not shown in Fig.), The device is lowered onto the slurry-cleared bottom 9 of the inclined well (Fig. 2). The azimuthal and zenith angles are measured by an IG-50 gyro-inclinometer, and a 1-directional imprint is made at the 9 wells. Before the device is lowered into the well on the case 2, the print is applied from the sighting line along the common sight line of the device k. 4 After the matching of the downhole print on the oriented print 1 with the surface of the raised core sample, a common core line k of the device is drawn on the core sample 10 on the raised drilling tool oriented sample core 10. The compared core sample on the target line of the well bottom 9 print (print) a cylinder-holder 11 of core samples made of transparent Plexiglas is placed, which is placed in the clamp 12 of the table of the inclinometer WSI-2 (Fig. 3) After adjusting the setting table 13 to determine the pairs The structure of the cores in the core sample is reproduced by the spatial orientation of the core, i.e. rock sample 10 is attached to a tag labeled with the position it occupied in the monolith prior to drilling out of hole 9. Core orientation is carried out According to the data on the curvature of the well in the core sampling interval. Measurements are made by mountain compass in a visual manner. The proposed device allows to obtain the necessary geological data in the search and exploration of mineral deposits. The effectiveness of using the device for lifting the core and its research in the installation table of the inclinometer ASI-2, as well as its advantages over the known devices and devices, is that the device is lowered and lifted in the well on a wireline using a wireline logging tool; it is possible to obtain measurement results in an anomalous geomagnetic field; the work on obtaining the oriented printing of the bottom hole label is carried out 10 times faster than usual; it is possible to conduct studies of an oriented core sample lifted from an inclined borehole after receiving a bottom seal, i.e. the upper end of the core, in the installation table inclinometer ASI-2, which was carried out before the descent into the well-tuning and calibration of the gyroscopic inclinometer universal geophysical devices. In addition, the proposed device makes it possible to carry out work 59 on the selection of oriented cores in wells up to 2000 m in depth, which is almost impossible to perform with currently known devices. The study of the oriented core in the installation table of the inclinometer ISI-2 and the calibration in the same table of the gyro inclinometer IG-50 of the device for taking measurements in the borehole, significantly increases the accuracy of all measurements made in the geological description of the core sample. Claim 1. Device for lifting core from svazhin, containing inclinometer with internal deviation of frame and print, characterized in that, in order to obtain reference orientation And the 16th wellbore printing in the anomalous geomagnetic field and the subsequent lifting of the oriented core sample, it is equipped with an external cylindrical orientator, which by means of the threaded part is rigidly combined with the inclinometer body and the seal. 2. The device according to claim 1, about 1 tl, which is that the outer orienter of the inclinometer contains a lead eccentric balance fixed in the inner part of the body, and a portion of the body opposite to the balance facilitated by perforation. Sources of information taken into account in the examination 1. The author's certificate of the USSR If 70596 ,, к. E 21 B, 1972. 2.Di konov D.I. General course of well logging. M., Nedra, 1977, p. 313-317 (prototype).