SU1731934A1 - Device for elimination of cutting plugs and pilling above downhole tool - Google Patents

Abstract

The invention relates to the technique of drilling a well and can be used mainly for drilling with hydro- or pneumatic conveying of a core using a double pipe string. The efficiency of the device is enhanced by eliminating the clamps of the outer pipe by dumping large pieces from the borehole walls in unstable rock ores. The device includes inner 1 and outer 2 pipes. The invention relates to a drilling technique, namely, devices for eliminating sludge plugs and debris above the bottom hole, mainly when drilling with hydro- or pneumatic conveying of a core using a double pipe string. A device for eliminating sludge plugs and debris is known, comprising a hollow body located above the bottomhole and rock-breaking elements 4 located above the bottomhole 3, as well as a gear wheel 5 and brackets 6 mounted on the inner pipe 1 and fixed gears on them xx7 8. In this case, in the outer tube 2 are made longitudinal grooves, the brackets 6 are placed in the slots. The inner tube 1 is mounted rotatably with respect to the brackets 6 and the outer tube 2 and axially movable relative to the latter. The brackets 6 have gears 10 for interacting with the intermediate gears 8. The elements 4 are mounted on gears 10. The gear wheel 5 on the inner tube 1 is mounted for transmitting torque to the intermediate gears 8. Above the brackets 6 in the slots are movable along the latter are arcuate dampers 11. To eliminate dumps, pipe 1 is guided through the grooves to the clamping point of pipe 2. A torque is applied to pipe 1. After elimination of the heap, pipe 1 returns to its original position, and drilling into Refreshed. 4 il. a cutter with protrusions reinforced by rock-breaking elements and a sleeve movable in the axial direction for blocking the radial channels connecting the housing cavity with the annular space in the axial direction. This device is ineffective when working with a double drill string used in hydraulic or pneumotrans VI SO with

Description

port of the core, due to the fact that when the sleeve is located inside the drill string, significant pressure drops occur, which impedes the normal drilling process.

Closest to the proposed device for eliminating sludge plugs and debris over a downhole projectile, comprising a hollow body, a milling cutter placed above the bottomhole projection, with protrusions reinforced by rock destructive elements facing the wellhead and axially movable spring-loaded bushing to block in the non-working position of the radial channels, mounted on the outer surface of the body under the router and rigidly connected to it, while above the router on the body there is a rigidly installed additional Sleeve with grooves on the bottom end under the projections of the router.

In this device, the torque is transmitted to the mill from the external drill tube rod, as a result of dumping of large pieces, the rod clips occur, and the torque is not transmitted to the mill, which makes it impossible to eliminate the blade.

The purpose of the invention is to improve the efficiency of the device by eliminating the clamps of the outer pipe by dumping large pieces from the borehole walls in unstable ore rocks.

The goal is achieved by the fact that the known device for the elimination of sludge plugs and debris above the downhole projectile, including the inner and outer pipes and rock-breaking elements located above the downhole projectile, is fitted with an toothed wheel mounted on the inner pipe and brackets with intermediate gears, longitudinal grooves in the outer tube, brackets mounted in the groove, the inner tube mounted for rotation relative to the latter and has gears for Intermediate Gear Loans. At the same time, the gear wheel on the inner tube is installed with the possibility of transmitting torque to the intermediate gears. And in the slots above the brackets, arc-shaped dampers are installed with the possibility of moving along the latter.

FIG. 1 shows a longitudinal section bb of the proposed device; in fig. 2, 3, - sections А-А and BB in FIG. one; in fig. 4 is a view of FIG. one.

The device consists of inner 1 and outer 2 pipes and 3 rock-breaking elements 4 located above the downhole. In addition, the device is equipped with 1 toothed wheel 5 mounted on the inner pipe and 6 brackets with intermediate gears 8 fixed in them on axes 7 The tube 2 has longitudinal grooves 9, the brackets 6 are placed in the grooves 9, the inner tube 1 is mounted rotatably with respect to the brackets 6 and the outer tube 2, and axially displaced with respect to the latter. The brackets have gears 10 for interacting with the intermediate gears 8 (helical gearing of the gear transmission), while the gear wheel 5 on the inner tube 1 is installed with a possibility of transmitting torque to the intermediate gears 8, and in the slots 9 above the brackets 6 are mounted along the last arc-shaped dampers 11.

The device works as follows. Torque to the bottomhole d 3 transmits the outer drill pipe tubular - outer pipe 2. Sludge and fines are sucked out through the inner hole of the inner pipe 1. In the case of large pieces of ore rocks and seizure of the stand (outer pipe 2), the torque is transmitted to inner tube 1. A tube 1 with a gear wheel 5 mounted on it and brackets with intermediate gears 6 fixed on them, gears 10 and rock-breaking elements 4 mounted on them is fed through the grooves 9 of the outer tube 2 to the place of nivani. The torque from the inner pipe 1 through the gear wheel 5, the intermediate gears 8, the gears 10 is transmitted to the rock-breaking elements 4, which drill out the rock outflows that have jammed the outer pipe 2. Broken fines fall at the wellhead. The inner tube 1 with the toothed wheel 5 fixed on it, the intermediate gears 8, the gears 10 and the rock-breaking elements 4 is returned to its original position. The torque is applied to the outer pipe, and the drilling of the well and the suction of the drill fines and cuttings continue. To prevent pieces of rock from entering the grooves 9 of the outer pipe 2, the grooves 9 are closed by an arcuate valve 11 capable of moving along the grooves 9. So that the torque is not transmitted to the brackets 6, the latter are connected to the inner pipe 1 via ball bearings. With the same

The purpose of gear 10 with rock-destroying elements 4 is connected to the brackets 6 via a ball bearing.

The application of the proposed device will ensure the effective elimination of sludge plugs and rock heaps above the bottomhole scale in unstable rock ores.

Claims (1)

Apparatus of the Invention A device for eliminating sludge plugs and debris over a downhole tool, including internal and external pipes and rock-breaking elements located above the bottomhole, characterized in that, in order to increase work efficiency by eliminating the clamps of the external pipe by dumping large pieces from the hole walls in unstable ore rocks, it is supplied the cogwheel mounted on the inner tube and the brackets with intermediate gears fixed in them on the axles are made in the outer tube longitudinal grooves, brackets placed in the grooves, the inner pipe is mounted for rotation relative to the brackets and the outer pipe and axial movement relative to the latter, the brackets have gears for interacting with the intermediate gears, while the gear wheel on the inner tube is installed with the ability to transfer torque to the intermediate gears Gears, rock-breaking elements are mounted on gears, and above the brackets in the slots, arcuate gates are mounted for movement along the latter. 3-3 ,four eleven