SU1411431A1 - Double core tool - Google Patents

Abstract

The invention relates to mining and allows for improved core recovery. The snar d contains a crown 1, a sub 4, an outer tube 2 in which a core-receiver tube 6 is fastened with a detachable retainer, connected to a piston in the form of a movable sleeve (PV) 8, having a saddle node, a discharge valve, and with a core holder in the form of a deformable snap 10. The pipe 2 is fixed to the housing 3 of the hydraulic shutter projec. A spool 7 is connected to the pipe 6 and PV 8, and the channel is communicated to the body 3 of the projectile gates. A spool 7 is connected to the pipe 6 and 8, and the channel communicates the cavity of the pipe with the external space. The slots between the petals of the slips 10 are made tangentially to the inner surface. During the drilling process, the flow of flushing fluid in the near-wellbore part splits: the part rises between the pipe 2 and the walls of the well, and the other part between the core and the pipe 6 and through the gate channel 16 enters the outer space. After the end of the drilling, the valve is thrown, PV 8 with the spool 7 and the pipe lowered. The petals of the clips 10, in contact with the crown 1, are deformed and clamped core material. 5 il. i (L

Description

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The invention relates to mining, a means for drilling wells with coring.

The aim of the invention is to increase the yield of the core.

FIG. 1 shows a double core drill while drilling; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a snip in the position of a core capture, general view: in FIG. 4 - core holder; in fig. 5 is a view B in FIG. four.

The double core projectile contains a crown 1 connected to the outer pipe 2, which in turn through the housing 3 and the sub 4 is connected to drill pipes 5. Inside the pipe 2, a core receiver 6 is fixed by means of a detachable retainer, connected through the valve 7 a piston in the form of a movable sleeve 8 having a saddle under the discharge valve 9.

At the lower end of the core receiver tube 6, the core holder is mounted in the form of a deformable shlip 10, the slots 11 between the petals 12 of which are made tangentially to the internal surface.

-Removable clamp core tube formed of a spring-loaded stud 13 installed in the nest 14 of the adapter 4, and interacting with the brace ring grooves 15 on the piston sleeve 8.

The housing 3 together with the spool 7 form a shutter having a channel 16, which communicates the jugs of the core tube 6 with the outer space.

Channels 17 and 18 are provided for the circulation of fluid injected into the well in the parts of the projectile.

The device works as follows.

During the drilling process, the flushing fluid supplied from the surface drilling mud (not shown) through the drillstring pipes 5 flows through the channels 17 and 18 into the annular gap between the outer 2 and core receiver 6 and then through the crown 1 to the bottom of the well. In the wellbore part, the flow splits: a part of the liquid rises through the annular gap between the outer pipe 2 and the walls of the well, another part of the liquid rises through the annular gap between the core and the inner walls of the core receiver b and through the channel 16 goes into the outer space,

in the annular gap between the outer pipe 2 and the walls of the well.

The slips 10 are designed and installed in such a way that the erosion effect of the direct flow of the washing liquid is practically prevented due to the presence of narrow slots between the petals directed tangentially to the inner surface of the core holder. Such a direction of the slits prevents the ejection of a direct jet of liquid from the core, and the small amount of liquid that can get to the core is directed tangentially to it and does not erode the core.

After the end of drilling, the valve 9 is thrown, which sits in the socket of the sleeve 8, blocking the flow of fluid.

Under pressure from the flushing fluid, the sleeve 8, together with the spool 7 and the core receiver tube 6, moves downwards. In this case, the petals 12, in contact with the inner

the curved surface of the crown 1 is deformed by tightly clamping the core material.

When, when the sleeve 8 moves downwards, the annular groove 15 on its outer surface coincides with the position of the pin 13, the latter will enter the annular groove and fix the sleeve 8 and the core holder interconnected with it. In cases where the core is represented by loose material, the core holder may sink lower, then the retainer will lock the sleeve to the second annular groove.

Claims (1)

Invention Formula  Double core projectile containing a crown, a sub, an outer tube, fixed in the outer tube with a detachable clamp core tube, connected to a piston in the form of a movable sleeve, 40 having a saddle for a waste valve, and with a core holder in the form of a deformable schlips, characterized in that, in order to increase the core output, it is equipped with a hydraulic gate, the casing of which is fixed on the outer pipe, the spool is connected to the core receiver and the movable sleeve, and the channel reports the cavity core tube with external space, while the slots between the petals of the slips are made tangentially to the inner surface. 45 r ± L Fig.Z I 5 FigL