Abstract: A downhole actuator typically for a downhole tool such as a valve, and typically for incorporation in a string of tubulars in an oil or gas well has a central axis with radially movable counterweights on opposite sides of the axis, which move radially outward to change the activation state of the actuator. The counterweights are supported by link arms which control the movement of the counterweights in response to centrifugal force created by rotation of the body, for example, during rotary drilling operations of the string. Radial outward movement of the counterweights typically transmits axial forces between sleeves at the upper and lower ends of the counterweights, so when the counterweights move radially outward, the upper and lower sleeves approach one another, which typically triggers the actuator.

Abstract: A housing (70) for a battery-powered electronic device is provided, the housing (70) comprising a wireless charging coil assembly (50) adapted to selectively wirelessly charge the battery. An adapter (1) has first and second ends, the first end comprising a tip (5) adapted to be inserted into a charging socket in the electronic device and the second end comprising a magnetic connector (10) suitable for magnetic connection to a complementary charging or data transfer cable. At least two electrical connectors (20; 120) are further disposed on the adapter (1) and which are selectively electrically connected to the tip (5).

Abstract: A downhole actuator typically for a downhole tool such as a valve, and typically for incorporation in a string of tubulars in an oil or gas well has a central axis with radially movable counterweights on opposite sides of the axis, which move radially outward to change the activation state of the actuator. The counterweights are supported by link arms which control the movement of the counterweights in response to centrifugal force created by rotation of the body, for example, during rotary drilling operations of the string. Radial outward movement of the counterweights typically transmits axial forces between sleeves at the upper and lower ends of the counterweights, so when the counterweights move radially outward, the upper and lower sleeves approach one another, which typically triggers the actuator.

Abstract: A downhole actuator typically for a downhole tool such as a valve, and typically for incorporation in a string of tubulars in an oil or gas well has a central axis with radially movable counterweights on opposite sides of the axis, which move radially outward to change the activation state of the actuator. The counterweights are supported by link arms which control the movement of the counterweights in response to centrifugal force created by rotation of the body, for example, during rotary drilling operations of the string. Radial outward movement of the counterweights typically transmits axial forces between sleeves at the upper and lower ends of the counterweights, so when the counterweights move radially outward, the upper and lower sleeves approach one another, which typically triggers the actuator.

Abstract: A downhole actuator typically for a downhole tool such as a valve, and typically for incorporation in a string of tubulars in an oil or gas well has a central axis with radially movable counterweights on opposite sides of the axis, which move radially outward to change the activation state of the actuator. The counterweights are supported by link arms which control the movement of the counterweights in response to centrifugal force created by rotation of the body, for example, during rotary drilling operations of the string. Radial outward movement of the counterweights typically transmits axial forces between sleeves at the upper and lower ends of the counterweights, so when the counterweights move radially outward, the upper and lower sleeves approach one another, which typically triggers the actuator.

Abstract: An oil, gas or water borehole drill bit protector apparatus (10, 100, 200, 300, 400) comprises one or more protector portions (10A, 10B; 100A, 100B) adapted to be placed around and/or adapted to envelope at least a drilling portion of the drill bit; and the one or more protector portions comprising an aperture (16) through which a connection portion of the drill bit projects in use. The one or more protector portions are placed around and/or enveloping the drilling portion of the drill bit; and closed around the drilling portion of the drill bit such that the connection portion of the drill bit projects through the aperture of the one or more protector portions.