SU1745871A1 - Device for determination of core orientation - Google Patents

Abstract

Usage: in coring from wells with indication of its position in space. SUMMARY OF THE INVENTION: The device has an inclinometric sensor with an erretry mechanism with a driving differential valve and a hydraulic damper, the piston of which through the spring-loaded rod interacts with the stopper in the open position. 2 Il.

Description

The invention relates to the drilling of exploration wells, namely to the means of selecting an oriented core.

A device for sampling an oriented core is known, which contains a visual inclinometric orientation sensor with an arresting mechanism of hydraulic control through a differential valve and a marking mechanism made in the form of a milling cutter with one or more jetting nozzles arranged radially.

A disadvantage of the known device is the lack of reliability associated with the low reliability of the sensor readings due to the influence of vibration of the drill string, since the differential valve is directly connected to the arresting mechanism and the sensing elements are fixed immediately after the flushing is turned off.

The purpose of the invention is to increase reliability by increasing the reliability of indications of an inclinometer sensor,

which does not depend on the vibration of the drill string.

This goal is achieved by the fact that it is equipped with a hydraulic damper, which has a piston connected to a spring-loaded rod, and the locking mechanism is installed in an open position with the possibility of interacting with the damper piston.

FIG. 1 shows the device, a general view; in fig. 2 is a view A of FIG. one.

The device consists of a housing 1, inside of which there is a visual float inclinometric sensor 2 with a transparent shell 3, a protective casing 4 and a spring-loaded arresting mechanism 5, which keeps the inclinometric sensor in the disarmed position.

Below sensor 2 orientation in the flow channel of the housing 1 is installed hydraulic damper 6, made in the form of a closed hydraulic cylinder with a piston 7 spring-loaded and a back valve

with

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ate with VJ

The piston 7 is connected with the upper rod 9 and the lower rod 10 on which the disk-shaped differential valve 11 is mounted. In view of the fact that the force of the spring of the piston 7 is greater than the force of the arresting mechanism 5, the rod 9 fixes in the initial position through the arresting mechanism 5 inclinometric sensor 2.

. The differential valve 11 is placed in a cylindrical sleeve 12, in the lower part of which there are side gaps for the passage of flushing fluid to the hydraulic hydroxter 13 after moving the differential valve 11 down.

The milling cutter 13 is equipped with an eccentric nozzle 14, which is made in the form of a narrow reinforced slot.

The sensor case 4 and the sensor are equipped with two elastic pressure compensators 15, which separate the two fluid media — clean inside the case 4 and in contact with the transparent sheath 3, as well as the usual washing fluid through which the hydrostatic pressure is transmitted to both compensators 15 This prevents abrasive material from entering the transparent sheath 3.

When drilling very hard rocks, a container 16 with an abrasive filler can be placed between the hydrotherner mill 13 and the body 1,

All parts located near the inclinometric sensor 2 are made of a diamagnetic material.

The device works as follows.

Upon reaching the bottom include flushing and bottom grinding. Then, the rotation is turned off and, in order to remove the twisting moment, the tool is torn off and then installed on it for applying hydro-hydromethyl through the eccentric nozzle 14.

At this time, the rod 9, the piston 7 and the rod 10 together with the disc differential valve 11 are in the lower position and the locking mechanism

5, having been released from pressing the rod 9, rasarret the inclinometric visual sensor 2.

After a time sufficient to leave a quality mark on the ground face, the flushing is switched off.

Having released from the axial force of the flushing fluid, the disk-shaped differential valve 11 together with the rod 9 and 10 slowly rises up due to the closing of the check valve 8 of the piston 7. During the return of the rod 9 to the stopper of the arresting mechanism 5, all sensitive elements of the sensor 2 in the quiescent state in relation to the northern meridian, apsidal plane of the well and the position of the eccentric nozzle 14.

Then, using known technologies, the oriented core is lifted and indexed on the surface.

The advantages of this device include: improving the quality of the hydraulic mark of the bottom; high accuracy of the obtained survey data for orientation in both inclined and vertical wells.

Claims (1)

Invention Formula A device for determining the orientation of the core, comprising a housing with a discharge channel and a jetting eccentric nozzle; mounted in the discharge channel, an inclinometric visual sensor with a protective cover equipped with an elastic pressure compensator, and an arresting mechanism of the sensor having a stop with a drive in the form of a differential valve fixed to a spring-loaded stem, characterized in that. in order to increase reliability, it is equipped with a hydraulic damper having a piston connected to a spring-loaded rod, while the stopper of the locking mechanism is installed in the open position with the possibility of interaction with the piston of the hydraulic damper. Tsfe- jl .one Byte.