A system for removing debris from a drill hole, the system comprising: a drill system comprising: a drill rod comprising a proximal end, a distal end a first lumen extending between the proximal end and the distal end, and a second lumen extending parallel to the first lumen, the first lumen being fluidically-isolated from the second lumen; a drill bit, the drill bit comprising: a proximal end for mounting to the distal end of the drill rod; a distal end configured to drill into a material so as to form the drill hole; at least one air channel extending between the proximal end of the drill bit and the distal end of the drill bit, the at least one air channel being configured to be fluidically connected to the first lumen of the drill rod when the dual channel drill bit is mounted to the drill rod; at least one vacuum channel extending between the proximal end of the drill bit and the distal end of the drill bit, the at least one vacuum channel being configured to be fluidically connected to the second lumen of the drill rod when the drill bit is mounted to the drill rod; a container fluidically connected to the second lumen of the drill rod; a compressor, the compressor being fluidically connected to the first lumen of the drill rod and fluidically connected to the container; wherein the compressor (i) pumps pressurized air through the first lumen of the drill rod such that the pressurized air passes through the at least one air channel of the drill bit and exits the distal end of the drill bit into the drill hole, and (ii) pumps air out of the container so as to generate a vacuum within the container, which vacuum is fluidically connected to the second lumen of the drill rod and hence to the at least one vacuum channel of the drill bit, such that pressurized air exiting the at least one air channel into the hole and debris in the hole enters the at least one vacuum channel, passes through the second lumen of the drill rod and into the container, such that the debris is collected in the container.

A flushing system in a drill bit is disclosed. The drill bit includes a body that defines the flushing system. The flushing system includes an inlet to facilitate supply of pressurized fluids into the bore hole. A cutting surface of the drill bit is provided with a main opening that defines a main passageway in communication with the inlet. A peripheral surface of the drill bit is provided with a secondary opening that defines a secondary passageway in communication with the inlet. The secondary passageway is disposed at an angle from a horizontal reference plane. The horizontal reference plane is defined between the inlet and the origin of the main passageway and is perpendicular to a central longitudinal axis of the body of the drill bit. An origin of the secondary passageway is at a distance from the origin of main passageway.

A flushing system in a drill bit is disclosed. The drill bit includes a body that defines the flushing system. The flushing system includes an inlet to facilitate supply of pressurized fluids into the bore hole. A cutting surface of the drill bit is provided with a main opening that defines a main passageway in communication with the inlet. A peripheral surface of the drill bit is provided with a secondary opening that defines a secondary passageway in communication with the inlet. The secondary passageway is disposed at an angle from a horizontal reference plane. The horizontal reference plane is defined between the inlet and the origin of the main passageway and is perpendicular to a central longitudinal axis of the body of the drill bit. An origin of the secondary passageway is at a distance from the origin of main passageway.

A drill bit, drill bit assembly and related methods of manufacture as disclosed involve a head portion having a circumference and a face surface, and a shank portion extending longitudinally from a side of the head portion opposite to the face surface. A central flushing channel extends longitudinally through the shank portion and a distance within the head portion, and a lateral flushing channel extends from the central flushing channel to the circumference of the head portion. A first portion of the lateral flushing channel is inclined, in a flushing fluid flowing direction, towards the face surface with respect to said second portion, and correspondingly, a second portion is inclined, in a flushing fluid flowing direction, towards the shank portion.

A drill bit, drill bit assembly and related methods of manufacture as disclosed involve a head portion having a circumference and a face surface, and a shank portion extending longitudinally from a side of the head portion opposite to the face surface. A central flushing channel extends longitudinally through the shank portion and a distance within the head portion, and a lateral flushing channel extends from the central flushing channel to the circumference of the head portion. A first portion of the lateral flushing channel is inclined, in a flushing fluid flowing direction, towards the face surface with respect to said second portion, and correspondingly, a second portion is inclined, in a flushing fluid flowing direction, towards the shank portion.

For clearing of the bore liners of geothermal wells, disclosed is a clearing tool that can be used without a drive motor, but with a drive hammer, to clear mineral deposits from the inside of the bore liners of geothermal wells. A forward end clears unwanted material from a live well. An aft end engages with a hammer device. The tool also has working surfaces to bear against and to cut through or to break up the unwanted material, at least one bypass passage conveying fluid from the live well through the clearing tool, and at least one exhaust passage communicating with the hammer device and conveying exhaust gases from the hammer to exhaust exit ports. The location of at least one exhaust exit port is a location that is situated aft of a forward face of the forward end of the clearing tool.

For clearing of the bore liners of geothermal wells, disclosed is a clearing tool that can be used without a drive motor, but with a drive hammer, to clear mineral deposits from the inside of the bore liners of geothermal wells. A forward end clears unwanted material from a live well. An aft end engages with a hammer device. The tool also has working surfaces to bear against and to cut through or to break up the unwanted material, at least one bypass passage conveying fluid from the live well through the clearing tool, and at least one exhaust passage communicating with the hammer device and conveying exhaust gases from the hammer to exhaust exit ports. The location of at least one exhaust exit port is a location that is situated aft of a forward face of the forward end of the clearing tool.

A drill bit nozzle assembly and drill bit including the same may include a conical or frustum contoured nozzle body. The nozzle body includes multiple movable closure elements circumferentially arranged to form an inlet orifice, a variable diameter outlet orifice, and a fluid a passage to transport fluid from the inlet orifice to the variable diameter outlet orifice. The nozzle assembly may further include an actuator configured to vary a diameter of the variable diameter outlet orifice based on a change of position of the movable closure elements.

A pressurized fluid flow system for a down the hole drill hammer has main and auxiliary chambers that exert work on the piston. The auxiliary chambers are formed around respective waists on the piston and externally delimited by respective cylinders which are arranged longitudinally in series. A set of supply chambers filled with the pressurized fluid are defined by annular recesses in the external surface of the piston for supplying said fluid to the chambers. Supply channels and discharge channels are formed in between the outer casing and the cylinders for respectively supply pressurized fluid through exit ports in the cylinders to the supply chambers and emptying the chambers through discharge ports in the cylinders. The supply and discharge of the chambers is controlled in a cooperative way by the piston and the cylinders. A normal circulation drill hammers is provided having this system.

A drill bit includes a shank and drill bit head, which are both centered on a longitudinal axis, a gauge, and a front face with a peripheral edge adjacent to the gauge. An area within the peripheral edge defines a total area of the front face. The front face includes a central island at its radially innermost section, a plurality of peripheral platforms at its radially outermost section adjacent to the peripheral edge, and a recessed section positioned radially between the central island and the peripheral platforms. The central island and the peripheral platforms are axially raised compared to the recessed section. A plurality of inner front inserts are positioned on the central island and at least one outer front insert is positioned on each of the peripheral platforms. The area of the recessed section is >62% of the area of the total area of the front face.