SU1218066A1 - Core-breaking device - Google Patents

Description

The invention relates to mining, in particular to technical means for capturing cores, used in the drilling of exploration wells in complicated geological conditions characterized by the frequent intermittency of weakly cemented and monolithic rocks.

The aim of the invention is to increase the yield of the core during the drilling of wells by preventing exposure to fluid.

FIG. 1 shows a core breaker device in the working position; in fig. 2 - the same, when jamming core material.

The device consists of a collet core 1 and an additional nut 2 fixed inside core 1 by rivets 3 (Fig. 1). The core breaker 1 and the collet 2 are divided into plate elements 4 and 5, respectively, with slots 6 and 7; The slots 6 of the core 1 are overlapped with plates 5 of the collet 2, similarly the slots 7 of the collet 2 are covered with the plates 4 of the core 1. An elastic element in the form of a split ring 8 is installed on the outer surface of the collet 2. pipe 9. The latter is connected to a piston 10 placed in a cylindrical beaker 11, cooperatingly threaded with a housing 12, onto which a drill bit 13, having an internal conical part, is screwed.

The housing 12 and the inner pipe 9 are fixed by a pin 14, which is destroyed after the washing hole 15 is blocked by a ball valve 16. Details 10, 11, 12, 14,

15 and 16 form the mechanism for forcing the inner core tube against the housing.

The device works as follows.

During the drilling process, the washing liquid is pumped from the surface through the space between the housing 12 and the core tube 9, as well as through the annular gap between the core tube 1 and the crown 13. In this case, the additional collet 2 overlaps the slits 7 with its lamellar elements 4 and protects the drilled rock (core) coming into the core tube 9 from the destructive influence of the flushing fluid flow. In this case, the flow of flushing fluid rushes not into the slot of core 1, but into the annular space between the outer surface of the core 1 and the inner surface of the drill bit 13. At the end of drilling, the ball valve 16 is thrown from the surface and the pump is turned on. After the ball valve

16 goes into the piston 10 and closes the flushing hole 15, a hydraulic pressure occurs, marked by a pressure gauge on the pump, the piston 10 cuts off the pin 14, and the core-receiver tube 9 moves to the lower position (Fig. 2). As a result, Kernorval 1 and collet 2 enter the conical part of the drill bit 13 and securely capture the core.

Compiled by V. Aksler

Tehred I. VeresKorrektor M. Demchik

Circulation 548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Pateit, Uzhgorod, st. Project, 4

fig.g

Claims (1)

(54 ") CORNER DEVICE, comprising a body with a crown having an inner conical part, an internal core receiver pipe, a collet core explorer connected to the internal core receiver pipe, and a mechanism for forcing the internal core receiver pipe relative to the housing, characterized in that, in order to increase core output by preventing the action of liquid on it, it is equipped with an additional collet fixed inside the collet core fin, while the slots of the collet core fin are overlapped with the elements of an additional collet.