SU977698A1 - Double core drill string - Google Patents

Description

(54) DOUBLE COLUMN WAREHOUSE

This invention relates to mining, in particular to core drilling tools.

Known are double core shells containing an outer tube with an adapter and a crown, an inner tube with a suspension assembly and an open-type core-breaker 1.

The possibility of spraying a kernorjatel when drilling with such shells reduces the reliability of its operation.

More sophisticated projectiles where closed cores are used.

Such a known projectile contains a tuned pipe with an adapter and a crown, an inner pipe with a suspension assembly connected by means of a hollow rod with an adapter, a core-breaker with uncoupled conical sectors not connected to each other and a thrust ring centering the sector, as well as a Sector 2 unclamping mechanism.

However, the use of hydraulic elements with small gaps and significant guide surfaces in the sector securing mechanism significantly complicates the design and contributes to the occurrence of failures during operation.

The purpose of the invention is to simplify the design.

This goal is achieved by the fact that in the DOUBLE-9M core column of the sector, the core companies are equipped with a resiliently deformable ring and are placed on the outer surface of the inner pipe, while the inner pipe is made with an outer annular groove to accommodate the sectors at the lower end of it, and the sector detachment mechanism made in the form of a screw pair formed by an adapter on the outer

15 pipe and rod assembly suspension inner pipe.

In addition, the rod is made with a bypass radial channel on the part of its stroke inside the adapter.

20

Figure 1 shows a double columnar d, a slit; in Fig.2, section A-A in Fig.1; FIGS. 3-6 core jamming schemes; 712 shows possible forms of core 25 sectors.

The double core projectile contains a hollow rod 1 and an adapter 2 interconnected by a thread 3 with protrusions 4, which prevent self-tightening of the thread. To eliminate

when the cuttings got into the threaded connection, the adapter 2 is screwed on a guide including a centralizer 5 with sealing rings b and a branch pipe 7.

On the rod 1 there are radial channels 8, designed for. draining the fluid from the drill string when lifting a projectile out of a well. Each channel 9 flushing fluid goes to the bottom of the drilling process.

The rod 1 is connected to a suspension assembly consisting of an adapter 10, a sleeve 11, a bearing 12, a shank. 1.3 and O-rings 14. The shank 13 is threadedly connected via an adapter 15 to an internal pipe 16.

The inner column pipe 16, together with its connected parts, is located inside the outer pipe 17 connected by threads with adapter 2, and underneath with a nipple 18, in which a retaining centering ring 19 is fastened. The nipple 18 is in turn connected to a crown 20 by thread. inner pipe outside em ring groove 21.

Kernel cores 22 are installed in the annular groove, in which transverse grooves are made on the outside of the cylindrical surface and are designed to install elastic deformable rings 23, which together with the sectors cover the inner core tube.

The mechanism for detaching the core sectors is formed by a screw pair i in the form of a stem 1 and an adapter 2 connected by threads 3.

Double columnar d works as follows.

A drill bit that includes a double core pipe in the position shown in Fig. 1 is lowered into the well and drilled in the usual way. A flushing fluid is supplied to the drill string through the central channel of the stem 1 and the radial holes 9 enters the annular gap between the Hc1 external and the inner 16 pipes, and then to the bottom of the well. The water is washed down, the liquid changes direction and is directed to the wellhead. Displaced by the coring fluid from the inner tube 16 along the radial channels of the adapter 15 aates out.

 ..Before lifting the drill string yes. on the surface of the drill column turn to the left. In this case, the rod 1 is partially unscrewed from the adapter 2 and lifts the inner tube 16. In this case, the sectors 22 abut against the stop-centering ring 19, and expanding the ring 23 leaves the groove 21 and are displaced downwards relative to the inner tube 16,.

entry into engagement with the core. When lifting a BBepk, the sectors of the lower parts fall into the lower part of the crown, jamming and disrupting the core. In the case of the presence of fractured rocks or ores at the bottom, the capture of the core is carried out by partially blocking the central hole of the crown and forming a self-ridge.

If necessary, in order to enhance the wedging of the core, the inner tube can be shifted somewhat downward by turning the stem 1 to the right.

When lifting a snare yes on the top. The radial holes 8 of the stem J are located above the centralizer 5, ensuring the discharge of fluid from the drill string in the event of a complete overlap of the central channel of the crown 20.

The core-breaking device of a double-core pipe can be equipped with two or only one sector. In Figures 1 and 2, a double-core pipe is shown with two sectors.

The sectors shown in Fig. 7 can be used to drill weakly fractured rocks. The presence of constrictions at the end of the sectors will allow them to pass more freely into the constricted part of the crown, thereby facilitating the jamming of large pieces of irregularly shaped core.

The sector, the general view of which is shown in Fig. 9, can be used when drilling highly fractured rocks with inclusions of monolithic rocks. Compared with the sector shown in Figs. 7 and 8, this sector is characterized by increased rigidity and self-centering capacity (approach, the central axis of the core pipe), thereby increasing the reliability of the core pickup.

The sector (Fig. 11) is intended mainly for drilling monoliths with small inclusions of fractured rocks, characterized by increased development (in diameter).

The elevated surface of contact with the core in various, including. number and almost diametrically opposite points, will provide an opportunity to ensure the selectivity of the core pickup location and increase the adhesion reliability.

Claims (2)

1. A double coring tube containing an outer tube with an adapter and a crown, an inner tube with a suspension assembly connected by means of a hollow rod with an adapter, a core breaker with unconnected friend with another gripping conic sectors and a centrirubdim sector with a thrust ring, as well as a sector loosening mechanism, and with the fact that, in order to simplify the design, the core sections are provided with an elastically deformable surrounding ring and are placed on the outer surface of the inner pipe, while the inner pipe is complete with an external annular groove to accommodate the sectors at its lower end, and the sector securing mechanism is designed as a screw pair formed by an adapter on the outer pipe and a stem zl suspension “and inner tube. . 2. Device POP.1, characterized in that the rod is made, with a diversion channel from the channel in the stroke of the rod inside the adapter. Sources of information taken into account in the examination 1. Grebenyuk A.A.Technique and core technology. M., Nedra, 1973, p. 22, fig. eight. 2.Sinitsin Yu.I. Universal dual core stencil Ural 15 types. - Exploration and protection of mineral resources, 1966, 9, p. 26-30. ch 13 Zo Fig.Z Fig.e Bb &-AT RS / GUO r-f Riga.g