Abstract: A pressure pulse generator for use in transmitting pressure signals to surface in a fluid-based drilling system having a housing having an inlet to admit drilling fluid to the interior of housing, and an outlet to discharge fluid from the interior of the housing; a control element slidably mounted in the housing between an open and a closed position, the control element generating a pressure pulse in the supply of pressure fluid when the control element takes-up the closed position; a control passage extending through the control elements and closable by a pilot valve element exposed to the pressure of the fluid in the passage; and an actuator coupled with the valve element to generate a pressure signal, to move the valve element to a position closing said passage and thereby to cause movement of the control element towards the closed position; the coupling between the actuator and the valve element includes a yieldable biassing element which provides control of the amplitude of the pressure signals produces

Abstract: A pressure pulse generator to generate pressure signals in drilling fluid for transmission to surface includes an outer housing having an inlet and an outlet for supply to the drilling assembly; a control element slidably mounted in the housing for opening and closing said inlet, the element being operative to generate a pressure pulses when it closes; a control passage extending through the element and closable by a valve element arranged to be exposed to the pressure in the passage; and an actuator assembly connected to the control element. The control element moves upon activation relative to the inlet to generate a pulse. When deactivated, it blocks the flow through the passage so that all of the fluid bypasses via the inlet.

Abstract: A pressure pulse generator for use in transmitting pressure signals to surface in a fluid-based drilling system having a housing having an inlet to admit drilling fluid to the interior of housing, and an outlet to discharge fluid from the interior of the housing; a control element slidably mounted in the housing between an open and a closed position, the control element generating a pressure pulse in the supply of pressure fluid when the control element takes-up the closed position; a control passage extending through the control elements and closable by a pilot valve element exposed to the pressure of the fluid in the passage; and an actuator coupled with the valve element to generate a pressure signal, to move the valve element to a position closing said passage and thereby to cause movement of the control element towards the closed position; the coupling between the actuator and the valve element includes a yieldable biassing element which provides control of the amplitude of the pressure signals produces

Abstract: A pressure pulse generator to generate pressure signals in drilling fluid for transmission to surface comprising: an outer housing (100) having an inlet (9) and an outlet for supply to the drilling assembly (59); a control element (10) slidably mounted in the housing (100) for opening and closing said inlet (9), said element being operative to generate a pressure pulses when it closes; a control passage (26, 27, 28) extending through the element (10) and closable by a valve element (36) arranged to be exposed to the pressure in the passage; and an actuator assembly (13, 14, 15, 17, 19, 21, 35, 36, 37) connected to the control element (10). The control element moves upon activation (10) relative to the inlet to generate a pulse. When deactivated, it blocks the flow through the passage (26, 27, 28) so that all of the fluid bypasses via the inlet.

Abstract: A pressure pulse generator for use in transmitting pressure signals to surface in a fluid-based drilling system. The generator is arranged in use in the path of a pressurized fluid to operate a drilling assembly and is capable of being actuated to generate pressure signals in such fluid for transmission to surface pressure monitoring equipment. The pulse generator includes pulse height compensation to keep the pulse height within acceptable limits over a wide flow range.

Abstract: A pressure pulse generator for use in transmitting pressure signals to surface in a fluid-based drilling system. The generator is arranged in use in the path of a pressurized fluid to operate a drilling assembly and is capable of being actuated to generate pressure signals in such fluid for transmission to surface pressure monitoring equipment. The pulse generator includes pulse height compensation to keep the pulse height within acceptable limits over a wide flow range.