Abstract: A hybrid bit includes fixed blades and wheel support structures. The wheel support structure includes a wheel inserted into a slot between a leading support and a trailing support. One or more shims fill a gap between a flange and the leading supports. An elongated seal between the wheel and the supports is provided to seal the wheel support.

Abstract: A downhole tool includes a housing configured to be connected between two tubular members. The housing includes a chamber and a plug assembly is disposed in the chamber and divides the chamber into an up-hole portion and a downhole portion. The plug assembly includes a glass member having a predetermined residual surface compression, at least a first face, and at least one strength-reducing surface feature on the first face. The strength-reducing surface feature is configured to cause the glass member to disintegrate when the glass member is exposed to a pressure in the up-hole portion of a magnitude that creates a tensile stress on the first face that exceeds the predetermined residual surface compression.

Abstract: A milling tool includes a cutting block in a recess in a tool body. The cutting block is configured to extend radially outward from and retract radially inward toward the tool body. The milling tool further includes a milling blade in a recess or cut-out in the cutting block. The milling blade is configured to extend radially outward from and inwards toward the cutting block. One or more links may couple the milling blade to the tool body to cause the milling blade to move radially relative to the cutting block when the cutting block moves radially relative to the tool body. The milling tool may be used as a dual string section mill to remove any of an inner casing, an outer casing, or cement between the inner and outer casings.

Abstract: A milling tool includes a cutting block in a recess in a tool body. The cutting block is configured to extend radially outward from and retract radially inward toward the tool body. The milling tool further includes a milling blade in a recess or cut-out in the cutting block. The milling blade is configured to extend radially outward from and inwards toward the cutting block. One or more links may couple the milling blade to the tool body to cause the milling blade to move radially relative to the cutting block when the cutting block moves radially relative to the tool body. The milling tool may be used as a dual string section mill to remove any of an inner casing, an outer casing, or cement between the inner and outer casings.