Casing filling and circulating apparatus

摘要: A casing fill circulator assembly is disclosed. The valve (42) constructed so that the member (52) moves out of main flowpath (12) when in open position. flow opens it and majority pressure drop taken an area other than interface between seat (60). For circulation, apparatus advanced further into (14) until a cup seal (20) closes off top (14). Once initiated condition, internal (14), at very low applied pressures, circulation (70) through accomplished while bypassing (42). Erosive effects from on are thus eliminated during circulation. An alternative dual-function circulator/filling disclosed where control system senses valve. If has been inserted such closed with seal, same then used to circulate.