Abstract: Disclosed herein is a downhole signal-conducting and power-conducting flexible cable that can stretch and contract as required while remaining conductively conducted to a source and a receiver. Also disclosed is a method of conducting a signal and power downhole through said flexible cable. The flexible cable can be used with or included with downhole tools.

Abstract: An activation method and a mechanism in which a pressure or flow sensor senses the pressure or flow rate of the treatment fluid being pumped through the drill string. A controller powered by a power source monitors the sensed pressure or flow rate within a first time window and via a suitable activator activates a first downhole tool or operation mode thereof if the sensed pressure or flow rate is stable with that time window. The controller monitors the sensed pressure or flow rate within a second time window and activates a second downhole tool or second operation mode of the first downhole tool if the sensed pressure or flow rate is stable with that time window. In one embodiment, the sensed pressure is combined with a rotation sensor sensing the rotation of the drill string. The controller logs the starting time for the pumping and the rotation.

Abstract: A method and a system for monitoring one or more control parameters in a borehole, wherein a downhole tool is mounted in a drill string and is able to measure at least one control parameter using suitable sensor units is provided. The downhole tool generates at least one pulsating signal based on the measurements, wherein this pulsating signal includes a single pulse where the pulse length is determined as function of the value of the measured control parameter. The pulse length may further be determined using a selected resolution for that control parameter. The pulsating signal is then transmitted to ground level via the drilling fluid where it can be read by simply monitoring the pump pressure. A simple test can be performed before starting the operation of the drill string.

Abstract: An agitator tool (1) for introducing forward and backward axial movement in a downhole tool of a drill string, where the agitator tool has a first axially moveable element (5) coupled to a second laterally moveable element (9) arranged inside a housing (2) via mechanical coupling. The mechanical coupling may be a pin and groove arrangement where the groove forms a modified or unmodified sinus shaped guiding loop that allows the first element (5) to oscillate within the housing (2). The second element (9) is driven by a turbine unit which may have flow regulating means. This provides an agitator tool comprising with very few moving and wearable parts. The shape of the groove sections allows an accelerated and/or de-accelerated forward and backward movement of the first element (5) that allows it to be used for various applications in a bore hole.

Abstract: The present invention relates to an activation method, an activation mechanism and a downhole tool comprising the activation mechanism. The activation mechanism com-prises a pressure switch for turning power to the electrical components, a control unit connected to a pressure sensor for sensing the internal pressure of the drilling fluid located in a first fluid conduit. The control unit controls an actuator unit connected to a moveable valve element. The actuator unit moves the valve element from a closed position when activated. A seat for the valve element is arranged relative to a second fluid conduit so that the valve element closes the second conduit when it is placed in its seat. This provides a very fast and accurate activation method that involves the use of balls or RFID tags. Furthermore, the downhole tool can be activated even if no actual flow is passing through the tool.

Abstract: A cutting tool (1) for widening the diameter of a borehole and method thereof is disclosed. The cutting tool (1) comprises a housing (2) having cavity (10) in which a moveable activation element (6) is arranged. The activation element (6) is moved in an axial direction and is connected to one or more cutting blocks via a mechanical coupling (15). The mechanical coupling (15) transfers the axial movement of the action element into a radial movement of the cutting blocks. An activation unit (24) pushes the activation element (6) towards a stopping position which in turn causes the cutting blocks (11) to move out of the housing. The activation unit (24) further pulls the activation element back towards its starting position which in turn causes the cutting blocks to move back into the housing. The cutting blocks (11) extend into one or more cavities formed in the activation element, thereby increasing the travel-to-expansion ratio.

Abstract: An activation method and a mechanism in which a pressure or flow sensor senses the pressure or flow rate of the treatment fluid being pumped through the drill string. A controller powered by a power source monitors the sensed pressure or flow rate within a first time window and via a suitable activator activates a first downhole tool or operation mode thereof if the sensed pressure or flow rate is stable with that time window. The controller monitors the sensed pressure or flow rate within a second time window and activates a second downhole tool or second operation mode of the first downhole tool if the sensed pressure or flow rate is stable with that time window. In one embodiment, the sensed pressure is combined with a rotation sensor sensing the rotation of the drill string. The controller logs the starting time for the pumping and the rotation.

Abstract: An agitator tool (1) for introducing forward and backward axial movement in a downhole tool of a drill string, where the agitator tool has a first axially moveable element (5) coupled to a second laterally moveable element (9) arranged inside a housing (2) via mechanical coupling. The mechanical coupling may be a pin and groove arrangement where the groove forms a modified or unmodified sinus shaped guiding loop that allows the first element (5) to oscillate within the housing (2). The second element (9) is driven by a turbine unit which may have flow regulating means. This provides an agitator tool comprising with very few moving and wearable parts. The shape of the groove sections allows an accelerated and/or de-accelerated forward and backward movement of the first element (5) that allows it to be used for various applications in a bore hole.

Abstract: A power generation system in which a thermally expandable fluid, e.g., R134a, CO2, is circulated in a loop between a first location and a second location, the second location being at a higher elevation than the first location. The fluid is heated at the first location to expand it, so that it rises to the second location where it is cooled and contracted. The cooled fluid, being denser, then falls back to the first location under hydrostatic pressure, causing a circular fluid flow. This flow is used to generate power in a power transfer system. The system is regulated so that the fluid does not flash to a vapor, i.e., the fluid does not change state, which improves the efficiency of the system. The system is suitable for use in any situation where a height difference exists, and is particularly suited for geothermal heating sources.

Abstract: A power generation system in which a thermally expandable fluid, e.g., R134a, CO2, is circulated in a loop between a first location and a second location, the second location being at a higher elevation than the first location. The fluid is heated at the first location to expand it, so that it rises to the second location where it is cooled and contracted. The cooled fluid, being denser, then falls back to the first location under hydrostatic pressure, causing a circular fluid flow. This flow is used to generate power in a power transfer system. The system is regulated so that the fluid does not flash to a vapor, i.e., the fluid does not change state, which improves the efficiency of the system. The system is suitable for use in any situation where a height difference exists, and is particularly suited for geothermal heating sources.

Abstract: A connection apparatus is adapted to allow connection of one substantially tubular member to another substantially tubular member. The connection apparatus includes a male connecting member and a female connecting member. Cooperating attachment mechanisms are provided on the male and female connecting members. Each of the male and female connecting members includes at least one primary surface adapted to form a primary joint and at least one secondary surface adapted to form a secondary joint. The at least one primary surface may be adapted to form a primary load bearing shoulder joint. The at least one secondary surface may be adapted to form a secondary load bearing shoulder joint. The connection apparatus may provide a double shoulder high torque connection for downhole tubular members. A double acting hydraulic jar is also disclosed.

Abstract: An impact enhancer apparatus includes: a substantially tubular inner member, a substantially tubular outer member that is axially movable in relation to the inner member, a primary energy storage device adapted to store energy when the inner member is moved in either of first and second axial directions with respect to the outer member and a secondary energy storage device adapted to store energy when the inner member is moved in a first axial direction with respect to the outer member. The primary energy storage device may include a primary biasing device. The secondary energy storage device may include a secondary biasing device. The primary and/or secondary biasing devices may be a spring device such as a disk spring, a coiled spring, a fluid spring, a gas spring, etc. The impact enhancing devices may include tubular members that have double shoulder high torque connections.

Abstract: An impact enhancer apparatus includes: a substantially tubular inner member, a substantially tubular outer member that is axially movable in relation to the inner member, a primary energy storage device adapted to store energy when the inner member is moved in either of first and second axial directions with respect to the outer member and a secondary energy storage device adapted to store energy when the inner member is moved in a first axial direction with respect to the outer member. The primary energy storage device may include a primary biasing device. The secondary energy storage device may include a secondary biasing device. The primary and/or secondary biasing devices may be a spring device such as a disk spring, a coiled spring, a fluid spring, a gas spring, etc. The impact enhancing devices may include tubular members that have double shoulder high torque connections.

Abstract: A connection apparatus is adapted to allow connection of one substantially tubular member to another substantially tubular member. The connection apparatus includes a male connecting member and a female connecting member. Cooperating attachment mechanisms are provided on the male and female connecting members. Each of the male and female connecting members includes at least one primary surface adapted to form a primary joint and at least one secondary surface adapted to form a secondary joint. The at least one primary surface may be adapted to form a primary load bearing shoulder joint. The at least one secondary surface may be adapted to form a secondary load bearing shoulder joint. The connection apparatus may provide a double shoulder high torque connection for downhole tubular members. A double acting hydraulic jar is also disclosed.

Abstract: A steerable motor system with integrated formation evaluation logging capacity is presented. The device comprises a housing, a formation resistivity logging tool, a surface signaling device, a density logging tool, a porosity logging tool and a downhole motor and drill. The formation resistivity logging tool is located below the downhole motor and is mounted within the housing wherethrough a drive shaft, extending from the downhole motor, is disposed. Power and signal cables are located within an outer shell of the housing and connect the surface signaling device with the resistivity logging tool. In an alternate embodiment, the resistivity logging tool is located between a motor stabilizer and the drill bit. The present invention allows for increased drill angle during wellbore drilling and formation evaluation.