Abstract: A charge canister for a perforation tool has a cylindrical body with an expansion portion extending along a radius of the cylindrical body, the expansion portion having a narrow portion at a first end of the expansion portion and a wide portion at a second end of the expansion portion opposite from the first end. An explosive material is disposed within the expansion portion in direct contact with an interior surface thereof.

Abstract: An air sampling system and method are provided to collect air samples from a plurality of air sample inlets. Before or after transmitting an air sample originating from one of the sample inlets, a signal gas is transmitted via the sample line in accordance with one of a plurality of predefined burp patterns, each of which uniquely corresponds to a different one of the sample inlets. The sample line is monitored for the signal gas in accordance with the predefined burp patterns. Based on detection of the signal gas in the sample line in accordance with one of the predefined burp patterns, a related action is taken. The related action can be identifying the sample inlet from which the air sample originated, or further transmitting the air sample via the sample line.

Abstract: A charge canister for a perforation tool has a cylindrical body with an expansion portion extending along a radius of the cylindrical body, the expansion portion having a narrow portion at a first end of the expansion portion and a wide portion at a second end of the expansion portion opposite from the first end. An explosive material is disposed within the expansion portion in direct contact with an interior surface thereof.

Abstract: A wall repair device comprising a thin, flexible disc having an inside portion surface area, an outside portion surface area and an outside perimeter located around the outside edge of the disc and a center portion located in the center of the disc, wherein the center portion is an attachment means; a wand removeably attachable to the center portion of the disc; and wherein the outside perimeter of the disc is collapsible towards and in the direction of the length of the wand when the wand is attached to the center portion of the disc. A method to repair a hole in a wall, wherein the wall is made of drywall plaster or plaster lathe, is also disclosed herein.

Abstract: A wall repair device comprising a thin, flexible disc having an inside portion surface area, an outside portion surface area and an outside perimeter located around the outside edge of the disc and a center portion located in the center of the disc, wherein the center portion is an attachment means; a wand removeably attachable to the center portion of the disc; and wherein the outside perimeter of the disc is collapsible towards and in the direction of the length of the wand when the wand is attached to the center portion of the disc. A method to repair a hole in a wall, wherein the wall is made of drywall plaster or plaster lathe, is also disclosed herein.