Abstract: Transducer assembly for an offshore drilling riser, in an example, includes a spool for connecting into the riser and a protrusion extending around the side wall of the spool. A recess extends around the protrusion between upper and lower sloping surfaces. Upper transducer bores are spaced around the protrusion and extend from the upper sloping surface downward and inward into the spool bore and lower transducer bores extend from the lower sloping surface upward and inward into the spool bore. A base of a rigid non-metallic material is located in each of the transducer bores. A seal ring extends around a cylindrical exterior portion of each of the bases and one of the transducer bores. An acoustic transducer element is mounted to the outer end of each of the bases. The transducer assembly can detect drilling fluid and form sealing.

Abstract: Transducer assembly for an offshore drilling riser, in an example, includes a spool for connecting into the riser and a protrusion extending around the side wall of the spool. A recess extends around the protrusion between upper and lower sloping surfaces. Upper transducer bores are spaced around the protrusion and extend from the upper sloping surface downward and inward into the spool bore and lower transducer bores extend from the lower sloping surface upward and inward into the spool bore. A base of a rigid non-metallic material is located in each of the transducer bores. A seal ring extends around a cylindrical exterior portion of each of the bases and one of the transducer bores. An acoustic transducer element is mounted to the outer end of each of the bases. The transducer assembly can detect drilling fluid and form sealing.

Abstract: The replaceable circulating liquid supplementing device comprising a guide pillar, a spring, a supplementing mat, a sealing ring, a liner and an external member matched with a container utensil, wherein the liner and the external member are fixedly assembled; the guide pillar is assembled in the liner; one end of the guide pillar is provided with a limit block while the other end is provided with a groove; a flow pass is arranged in the middle of the guide pillar; the supplementing mat is hermetically arranged in the groove; one end of the flow pass passes through the supplementing mat, as a liquid inlet, while the other end of the flow pass is provided with a liquid outlet; the spring is sleeved on the outer wall of the guide pillar; and the sealing ring is arranged at one end of the guide pillar near the limit block.