Abstract: 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 communica

Abstract: Device for use in the drill string used to drill an oil well. The device has a cylindrical body, four passageways located lengthwise through the cylindrical body, and a Y-shaped bottom member, which has a Y-shaped passageway therethrough. The two upper arms of the bottom device communicate with two oppositely-located passageways in the cylindrical body. Such Y-shaped passageways communicate with the bottom portion of the drill pipe. A top stem, which has a longitudinal passageway thereof and which has four side ports. Such longitudinal passageway communicates with the top portion of the drill pipe. A collar is rotatably positioned around the four ports of the top stem and is slidably removable from the top stem. The collar has two side L-shaped arms, with a passageway in each arm. Retainer means which is detachably positioned around the top of the top stem. The cylindrical body tightly and rotable fits within the well casing.