RU2250981C1 - Drilling body for extraction of directed core - Google Patents

Abstract

FIELD: geology.

SUBSTANCE: device has columnar pipe with drilling crown, transfer pipe, core extractor and core-directing device. Core-directing device is in form of arc-shaped pipe of plastic-flexible material, separated on sections. Inside each section of pipe metallic ball of hard material is placed. Pipe ends are closed. Pipes are held in circular groove, made on inner surface of core extractor upper end. Upper end of extractor is separated on sectors by means of slits. Drilling body is of simple construction and operation and provides trustworthy data concerning inclinometer measurements of core.

EFFECT: higher efficiency.

3 dwg

Description

The present invention relates to devices for producing and extracting undisturbed core, namely, oriented core, and may find application for the selection of oriented core when drilling exploration wells in a core method in solid rocks.

A device is known for extracting oriented core (A. S. No. 759709, IPC E 21 B 47/02, B.I. No. 32 - 1980). The device comprises a core projectile, a crown, a longitudinally movable core breaker and an orientator. In this case, the orientator is made in the form of rings interacting with each other from plastic material, a spring and a movable sleeve and is located under the core cutter with the possibility of interaction with it.

The disadvantage of the device according to A. S. No. 759709 is the high probability of errors in determining the position of the apsidal well plane.

A device is also known for the selection of oriented core (A. S. No. 883321, IPC E 21 B 25/16, B. I. No. 43 - 1981). The device comprises an outer pipe with an adapter and a crown, an internal core collection pipe, a mechanism for marking the core connected to the core collection pipe, and an apsidal plane position sensor with a multiple marking mechanism and a clamping element in the gap between the soft metal plate and the movable heel on a spring loaded stock. In this case, the marking element is made in the form of a group of balls of different diameters, the rod has an injection channel for moving the balls in the clamp gap, and the heel of the clamp and the soft metal plate are located inside the core-receiving pipe, which is spring-loaded with the possibility of longitudinal movement relative to the outer pipe.

The disadvantage of the device according to A. S. No. 883321 lies in the complexity of its design.

A well-known core orientator for the selection of oriented core from exploration wells (A. S. No. 1257162, IPC E 21 B 25/16, B.I. No. 34 - 1986 prototype). The core orientator consists of a core pipe with a drill bit and adapter, an orienting sensor, a core explorer with a casing, and a core orientation device. The core-orienting device consists of a marking cutter mounted on a casing, and an indenter installed in the drill bit and hidden in the holes of the casing in the form of a ring made of elastically deformable material, on which a replaceable washer made of plastic-deformable material is placed.

The core orientator according to A. S. No. 1257162 has the following disadvantages: the complexity of the design, the possibility of errors in determining the apsidal plane of the well due to the possible rotation of the crown at a certain angle when the drill string is pulled in the process of interlocking and detaching the core from the bottom.

The task: to simplify the design of the core orientator according to A.S. No. 1257126 and to increase the reliability of information on the measured apsidal well plane.

The problem is solved as follows. A drill for the selection of oriented core consists of a core pipe, adapter, drill bit and core drill, inside which a core-orienting device is placed. The latter consists of an arcuate tube of plastic deformable material. The tube is divided into sections, in each of which a loose hard ball is placed. The arcuate tube is fixed in a circular groove of the upper part of the core core, the end of which is divided into sectors by means of slots.

The invention is illustrated by drawings:

- figure 1 is a General view of the drill in axial section;

- figure 2 - core drill with a core-orienting device (top view);

- figure 3 is the same, a section along aa.

A drill for selecting an oriented core consists of a core pipe 1, an adapter 2 and a drill bit 3, inside which a core explorer 4 is placed (Fig. 1). On the inner surface of the core core 4 at the upper thickened end there is a groove 5, in which a core-orienting device is mounted (Figs. 2, 3), which is an arc-shaped tube made of plastic-deformable material, for example, aluminum. The tube is divided into sections, for example, two - 6 and 7. In each section a ball of solid material 8 and 9 is placed, while the ends of the tube are plugged. The upper end of the core core 4, cutting perpendicularly to the groove 5, is cut into sectors so that the upper end surface has springing properties. This allows you to fix the core-orienting device, that is, the tube, in a circular groove and exclude the possibility of its loss. The inner diameter of the core-orienting device is slightly smaller than the inner diameter of the core explorer.

After driving a certain interval of the well, the drilling process is stopped and the well is stopped, the well is washed, the core explorer and core-orienting device continue to remain under the end of the core pipe 1 in the upper part of the drill bit 3. At the same time, the core explorer with the core-orienting device is held on the core column due to the spring properties of the core explorer and longitudinal section 13. A ball, for example 9, in the tube 7 shows the desired apsidal plane 14, since the tube 7 is located in the lower part of the bottom of the well. Ball 8 will always be at the end of the tube 6, while the latter is located at the top of the bottom of the well, and the readings of ball 8 are not taken into account. After this, the core is detached from the bottom and the projectile is lifted from the well.

In the projectile lifted from the well, the drill bit is unscrewed and the core column is carefully removed along with the core drill and core orienting device. Visually, through the cutouts of the core explorer sectors, the desired ball is found and the mark is marked with an oil pencil through which the apsidal plane 14 of the well passes. According to the position of the mark on the core and taking into account inclinometric measurements in the well, the elements of rocks in the massif are determined using a core meter.

The proposed technical solution has the following advantages:

- the device is simple in design and operation;

- it improves the accuracy of determining the apsidal plane of the well.

Claims (1)

Oriented core drilling tool, consisting of a core pipe with a drill bit and an adapter, in which a core drill and core orienting device are located, characterized in that the core orienting device is made in the form of an arc-shaped tube of plastic deformable material mounted in a circular groove on the inner surface the upper end of the core breaker and divided into sections, while in each section of the tube a ball of solid material is freely placed, and the ends of the tube are plugged.

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