Abstract: A method of drilling radial boreholes from a first borehole without withdrawing the drill string from the hole, by providing a first carrier string, a drill string within the carrier string, and a method for orienting the position of the carrier string relative to the position of the inner string, so that the strings are co-oriented, without the need to retrieve either the carrier string or the inner drill string from the bore hole for drilling consecutive radial wells.

Abstract: An apparatus for filtering drilling mud that is being recirculated out of the drill hole. A flow conveying tubular section has at its first lower end a flanged base portion sealably attachable to the well casing or blow out preventer and is open-ended at its second end for allowing fluid flow therethrough. Also provided is an outer tank portion encapsulating substantially the upper half portion of the tubular section. The tank portion has an open-ended top for receiving flow out the upper end of the flow conveying tubular section and is integrally attached at its bottom portion to the outer surface of the tubular section to define a container for receiving fluid flow from the tubular section. An adjustable primary filter is provided on that portion of the tubular section enclosed by the tank portion for filtering and conveying fluid out of the tubular section into the tank portion. There is provided a secondary filter having a plurality of angulated vanes defining an angulated mud filtering surface.

Abstract: An apparatus for filtering drilling mud that is being recirculated out of the drill hole, which substantially comprises the flow conveying tubular section having at its first end a flanged base portion sealably attachable to the top portion of the hydril and open-ended at its second end for allowing fluid flow therethrough. Also provided is an outer tank portion encapsulating substantially the upper half portion of said tubular section, the tank portion having an open-ended top portion for receiving flow out of the end portion of the flow conveying tubular section and integrally attached at its bottom portion to the outer surface of the flow conveying tubular section, the outer tank portion defining a container for receiving the flow from the tubular section.