Bottom preventer for use in a drilling system

A conduit assembly for use in a drilling system, the conduit assembly comprising:

• an upper portion including a first seal, the first seal including:
• an outer edge;
• an opening sized and configured to receive and form a seal with an inner drill string;
• and
• at least one slit extending from the outer edge of the first seal to the opening of the first seal;
• an intermediate portion including an outlet for a flushing medium;
• and
• a lower portion sized and configured to be connected to and disconnected from a connecting portion of an outer drill string,
• wherein the lower portion of the conduit assembly is sized and configured to engage a clamp when the lower portion of the conduit assembly is connected to the outer drill string to prevent a loss of the outer drill string down a borehole.

A conduit assembly for use in a drilling system, the conduit assembly comprising:

• an upper portion including a first seal, the first seal including an opening sized and configured to receive and form a seal with an inner drill string;
• an intermediate portion including:
• a hollow interior;
• an outer surface;
• an inner surface;
• and
• an outlet for a flushing medium, the outlet including a projection that extends into the hollow interior beyond the interior surface;
• and
• a lower portion sized and configured to be connected to and disconnected from a connecting portion of an outer drill string,
• wherein the projection that extends into the hollow interior beyond the interior surface is sized and configured to break up portions of the flushing medium and debris conveyed by the flushing media.

A conduit assembly for use in a drilling system, the conduit assembly comprising:

• an upper portion including:
• a first seal including:
• an outer edge;
• and
• an opening sized and configured to receive and form a seal with an inner drill string;
• and
• a housing that houses at least a portion of the first seal, the housing including:
• an inner surface that abuts the outer edge of the first seal such that, when the first seal is axially compressed, a radial force increases a strength of the seal formed between the inner drill string and the opening in the first seal;
• an intermediate portion including an outlet for a flushing medium;
• and
• a lower portion sized and configured to be connected to and disconnected from a connecting portion of an outer drill string.