초록 ▼

In a combination for the drilling of a gas, oil, water and/or steam well comprised of a well hole, which is being drilled, well casing, which extends at least part of the way down the well hole, rotatable drill pipe, which extends down the well hole to the bottom thereof and which contains a passage

In a combination for the drilling of a gas, oil, water and/or steam well comprised of a well hole, which is being drilled, well casing, which extends at least part of the way down the well hole, rotatable drill pipe, which extends down the well hole to the bottom thereof and which contains a passageway through the center thereof, a drill bit attached to the bottom of the drill pipe, means for rotating the drill pipe and the drill bit, and means for forcing a fluid, such as, drilling mud, down the passageway of the drill pipe to and through the drill bit, an annulus being formed by the region between the well casing and side of the well and the drill pipe, the fluid exiting out the annulus, the improvement which comprises a reverse circulating tool or device located in the casing, the device comprising a cylindrical main body, means for attaching the device to the top portion of the drill pipe, means for attaching the device to the bottom portion of the drill pipe, a first passageway in the main body communicating between the top portion of the drill pipe and the portion of the annulus located below the main body, and a second passageway in the main body communicating between the bottom portion of the drill pipe and the portion of the annulus located above the main body, the main body tightly and rotatably fitting within the well casing.

대표청구항 ▼

A device for reversing the flow of circulating fluid which comprises a cylindrical body, which has a flat upper surface and a flat lower surface, the flat upper surface and the flat lower surface being perpendicular to the central axis of the cylindrical body, a protrusion on the bottom of the cylin

A device for reversing the flow of circulating fluid which comprises a cylindrical body, which has a flat upper surface and a flat lower surface, the flat upper surface and the flat lower surface being perpendicular to the central axis of the cylindrical body, a protrusion on the bottom of the cylindrical body, the central axis of the bottom protrusion generally lying on the central axis of the cylindrical body and the end of the bottom protrusion being externally threaded, the width of the bottom protrusion being less than the diameter of the cylindrical body, a protrusion on the top of the cylindrical body, the central axis of the top protrusion generally lying on the central axis of the cylindrical body, the width of the top protrusion being less than the diameter of the cylindrical body, a first passageway which lies generally on the central axis of the bottom protrusion and which extends through the cylindrical body to a site on the upper end surface of the cylindrical body located away from the interface of the cylindrical body and the top protrusion, and a second passageway which lies generally on the central axis of the top protrusion and which extends through the cylindrical body to a site on the lower end surface of the cylindrical body located away from the interface of the cylindrical body and the bottom protrusion, the end of the first passageway in the top protrusion being internally threaded, the first passageway and the second passageway not intersecting.