| 摘要 |
A downhole circulation valve, particularly useful for using generated lost circulation material to inhibit the initiation or propagation of subterranean strata fractures comprises a conduit assembly with at least one slurry passageway apparatus member (58), a first conduit string member (50) and at least one larger diameter additional conduit string member (51). Alignment of a radially-extending passageway member (75) allows communicating between an internal passageway member (53), an intermediate enlarged internal passageway member (54A), an additional annular passageway member (54),a first annular passageway member (55), or combinations thereof, such that fluid slurry flowing in one of said passageway members (53, 54, 54A, 55) is diverted through said at least one radially-extending passageway member (75) to another of said passageway members (53,54, 54A, 55) to control the slurry circulation velocities and pressures. |
