KR-102965265-B1 - INDEPENDENT MULTI-CHANNEL FULL-HOLE REVERSE CIRCULATION CLUSTER DOWN-THE-HOLE HAMMER

KR102965265B1KR 102965265 B1KR102965265 B1KR 102965265B1KR-102965265-B1

Abstract

The present invention relates to a reverse-circulation cluster downhole hammer for drilling rock strata, comprising a drill rod, a drill rod joint, a drill rod ventilation pipe, a sorting bin, at least one impactor, and an upper pressure plate, a lower pressure plate, and an upper outer protective tube for fixing the impactor. Between the impactors, at least one injection suction hole air pipe communicating with the sorting bin and at least one sludge return pipe for sludge return are installed; the lower ends of the injection suction hole air pipe and the sludge return pipe are located near the impactor drill head, and an injection suction hole is installed at the lower end of each injection suction hole air pipe to form negative pressure. The present invention improves drilling efficiency by providing a good sludge discharge effect, preventing the sludge discharge transfer pipe from being easily damaged, and reducing the repeated crushing of rock debris particles.

Inventors

자오 예천
옌 청량
징 펑정
자오 예수이
자오 예춘

Assignees

하오저우 드릴링 엔지니어링 머시너리 (산둥) 컴퍼니 리미티드

Dates

Publication Date: 20260513
Application Date: 20231115
Priority Date: 20221118

Claims (5)

In a standalone multi-channel full hole reverse circulation cluster downhole hammer comprising a drill rod (13), a drill rod joint (1), a drill rod ventilation pipe (3), a sorting bin (5), at least one impactor (8) and an upper pressure plate (4), a lower pressure plate (9) for fixing the impactor (8), and an upper outer protection tube (6) for the impactor, Each impactor (8) provides power through the classification bin (5) via the drill rod ventilation pipe (3), and Between the above impactors, at least one injection suction hole air pipe (7) communicating with each other and at least one sludge return pipe (11) for sludge return are installed; the lower ends of the injection suction hole air pipe (7) and the sludge return pipe (11) are located near the impactor drill head (10), and injection suction holes (12) for forming negative pressure are installed at the lower ends of all injection suction hole air pipes (7), and an outer flange (20) is fixed to the sludge discharge port at the lower end of the sludge return pipe (11), and the airflow direction of the injection suction holes has a constant angle of inclination with both the axial and radial directions of the sludge discharge port so that a vortex negative pressure is formed after air injection, and the sludge gravel is discharged by the sludge return pipe (11); An inner protective tube (19) is installed on the upper outer circumference of the drill rod (13), and an outer protective tube (16) is fitted and connected to the outer circumference of the inner protective tube (19). A bearing (17) is installed between the outer protective tube and the inner protective tube to allow the outer protective tube and the inner protective tube to rotate relative to each other. The space between the inner protective tube and the outer protective tube is an annular sludge discharge bin (14). The lower end of the sludge discharge bin (14) is connected to a sludge return pipe (11) for sludge return. A sludge discharge transfer pipe (15) for sludge discharge is connected to the side of the sludge discharge bin (14). An arc-shaped sludge discharge baffle (18) is installed above the sludge return pipe (11) inside the sludge discharge bin (14), and the sludge discharge baffle (18) has a detachable structure; The sludge discharge baffle (18) is located at the top of the inner protective tube (19), and the sludge discharge baffle forms an outward arc shape; The outer flange is toroidal, and its lower end is serrated, and a roller shaft (21) is fixed in the radial direction of the lower end of the outer flange, and one rotatable roller (22) is installed on the roller shaft (21), and the radial surface of the roller is serrated, and the roller protrudes from the outer flange; An independent multi-channel full-hole reverse circulation cluster downhole hammer, wherein a rotatable roller with teeth is additionally mounted at the sludge discharge port, so that when the downhole hammer is operated, the downhole hammer rotates along the circumferential direction and the roller contacts the bottom of the hole, and as the roller rotates while receiving frictional resistance from the rock surface at the bottom of the hole, the rock debris accumulated at the sludge discharge port is disturbed and introduced into the sludge discharge pipe, thereby discharging the rock debris under negative pressure conditions.
In paragraph 1, The above injection suction hole airway tube (7) and sludge return pipe (11) correspond one-to-one and are uniformly distributed between impactors, and the airflow direction of the above injection suction hole has an inclination angle of 5-30 degrees with respect to the axial direction of the sludge discharge port and an inclination angle of 5-30 degrees with respect to the radial direction, in an independent multi-channel full hole reverse circulation cluster downhole hammer.
In paragraph 1, Each of the above injection suction holes at the bottom of the injection suction hole airway (7) is an independent multi-channel full hole reverse circulation cluster downhole hammer with 2 to 8 injection suction holes.
In paragraph 1, An independent multi-channel full-hole reverse circulation cluster downhole hammer, wherein the roller is fixed to the roller shaft through a sleeve, and a baffle is installed between the roller shaft and the outer flange to fix the roller shaft.
In paragraph 1, The above roller is an independent multi-channel full-hole reverse circulation cluster downhole hammer having serrated ends and a circumferential groove in the middle.

Description

Independent Multi-Channel Full-Hole Reverse Circle Cluster Down-the-Hole Hammer The present invention relates to a reverse-circulation cluster downhole hammer for drilling rock strata, and in particular to a standalone multi-channel full-hole reverse-circulation cluster downhole hammer. Currently, commonly seen drilling processes are classified into two types based on the drilling fluid (gas) circulation method: one is a reverse circulation drilling process, where all reverse circulation is returned upward from the center pipe of the drill rod, and the other is a forward circulation drilling process, where all forward circulation is returned upward between the drill rod and the hole wall. Most current downhole hammers discharge sludge using the forward circulation method, although some also discharge sludge using the reverse circulation method. The reverse circulation sludge discharge process forms a local negative pressure zone at the bottom of the downhole hammer, and the drilling sludge passes directly through the sludge discharge port, flows into a vertical central pipe, returns upward, returns to the top of the drill rod, and is then discharged through a horizontal soft pipe. Compared to the forward circulation process, the reverse circulation sludge discharge process is increasingly being used because the drilling sludge returns upward faster, the bottom of the hole is clean, the repeated crushing of rock debris is reduced, and the drilling efficiency is high. Conventional reverse circulation sludge discharge processes primarily suffer from the following three shortcomings: First, reverse circulation requires a constant liquid level within the holes. When gas enters the sludge discharge pipe, a gas-liquid mixture is formed; as this mixture's specific gravity decreases, it floats upward. Since the liquid within the holes outside the sludge discharge pipe has a higher specific gravity, the gas-liquid mixture in the pipe floats upward and is forced into the pipe, thereby forming reverse circulation. The theoretical condition for forming reverse circulation is that the sinking ratio (the ratio of the depth of the sludge discharge pipe buried in the liquid to the total height of the sludge discharge pipe) must be 0.4 or higher for reverse circulation to be realized (if the sinking ratio is less than 0.4, the liquid pressure outside the sludge discharge pipe is lower than the upward resistance of the gas-liquid mixture inside the pipe, making it impossible to form reverse circulation). Second, in the general reverse circulation type, sludge discharge from the drill head is collected in the center pipe of the drill rod, so wear is severe, costs are high, and maintenance of the drill rod is cumbersome and complex. Third, in current downhole hammers on the market, when reverse circulation sludge returns, the sludge return port discharges straight sludge, and generally, the sludge gravel must be crushed into small particles to smoothly discharge the drilling sludge, which reduces drilling efficiency. In particular, with large gravel particles, sludge discharge is not smooth, and there are cases where the downhole hammer cannot operate normally. FIG. 1 is a schematic front cross-sectional view of the impactor part of the present invention. FIG. 2 is a schematic planar cross-sectional structural diagram of the impactor part of the present invention. FIG. 3 is a schematic front cross-sectional view of the sludge discharge portion of the present invention. FIG. 4 is a schematic planar cross-sectional structural diagram of the sludge discharge portion of the present invention. FIG. 5 is a schematic front view of the main body structure of the present invention. FIG. 6 is a schematic structural diagram of the sludge discharge bin of the sludge discharger of the present invention. FIG. 7 is a schematic structural diagram of the sludge discharge port of the sludge discharger of the present invention. FIG. 8 is a schematic diagram of the anti-clogging structure of the sludge discharger of the present invention. The present invention will be described in detail below in combination with FIGS. 1 to 8. As illustrated in FIGS. 1 to 8, the standalone multi-channel full-hole reverse circulation cluster downhole hammer of the present invention comprises a drill rod (13), a drill rod joint (1), a drill rod ventilation pipe (3), a sorting bin (5), at least one impactor (8), an upper pressure plate (4), a lower pressure plate (9) for fixing the impactor (8), and an external protective tube (6) for the impactor. The present invention has nine impactors installed, six located around the periphery and three located in the middle. Each impactor is powered through the sorting bin (5) by the drill rod ventilation pipe (3). Three sets of independent sludge discharge systems are installed between the impactors and are each located at a position between the impactors. Each set of sludge discharge systems includes a spray suction hole airw