Abstract: A heating device includes a base member and a gas burner mounted in or on the base member. An upper housing located above the base member and a tabletop mounted above the upper housing. A hollow heat shield having a proximal end located on or near the base member, and a distal end located within the upper housing, and a support member extending between the base member and the upper housing or tabletop. The distal end of the heat shield extends beyond a proximal end of the upper housing, defining a region of vertical overlap between the heat shield and the upper housing.

Abstract: A heating device includes a base member and a gas burner mounted in or on the base member. An upper housing located above the base member and a tabletop mounted above the upper housing. A hollow heat shield having a proximal end located on or near the base member, and a distal end located within the upper housing, and a support member extending between the base member and the upper housing or tabletop. The distal end of the heat shield extends beyond a proximal end of the upper housing, defining a region of vertical overlap between the heat shield and the upper housing.

Abstract: An underreamer tool for use in a wellbore of an oil or gas well and a method of actuation. In an embodiment, the underreamer tool has body having a longitudinal axis and a fluid conduit, a tool element and an actuation device configured to urge the tool element relative to the body from a first configuration into a second configuration. In this embodiment, a portion of the tool has a curved actuation surface and as the tool element is urged across the curved actuation surface, the tool element is moved radially with respect to the body of the tool. Typically, the actuation device may include a piston driven by pressure of fluid circulated through the fluid flow conduit.

Abstract: The present invention relates to downhole tools, and in particular an underreamer tool for use in a wellbore of an oil or gas well and a method of actuation. In an embodiment, the underreamer tool has body having a longitudinal axis and a fluid conduit, a tool element and an actuation device configured to urge the tool element relative to the body from a first configuration into a second configuration. In this embodiment, a portion of the tool has a curved actuation surface and as the tool element is urged across the curved actuation surface, the tool element is moved radially with respect to the body of the tool. Typically, the actuation device may include a piston driven by pressure of fluid circulated through the fluid flow conduit.