Abstract: Various embodiments of a fishing float are provided. The fishing float has an internal axial passageway for use when a slip-type configuration for the float is desired, and a plurality of divergent passageways for use when a fixed-type configuration for the float is desired.

Abstract: A temporary seaming bridge (62) for connecting two belt ends (26,27) during seaming comprises a bridge portion (63) with a plurality of pegs (34,35) provided at each end. The pegs (34,35) are complementary with apertures (28,29) provided in the belt ends (26,27) such that the pegs (34) at one end of the bridge engage the apertures (28) in one belt end (26) and the pegs (35) of the other end of the bridge engage the apertures (29) in the other belt end (27).

Abstract: Once a new oil well has been drilled and cased, a test string is set in place for the purpose of evaluating the production potential of the chosen formation. One way of controlling the operation of the various tools included in the downhole test string, including the opening and closing of the downhole valve itself, is by changes in the pressure differential between the tubing and the annular space which surrounds it in the well, but this requires the provision and maintenance of a fixed "reference" pressure within the tool, and a convenient such pressure is the hydrostatic (annulus) pressure experienced by the string after it has been lowered down the well bore and set into the packer.

Abstract: For use as part of a test string employed to evaluate the production potential of a chosen formation through which an oil well has been drilled, an annulus-pressure-operated sub-surface control valve, typically a ball valve, wherein to deal with the problem of the high pressure of fluid acting on the upstream side of the ball resulting in the frictional forces caused by the ball being pressed up against the seating on its downstream side making the ball stick, the utilization of a differential thread force multiplier by which the actuating force may be applied to the ball.

Abstract: Apparatus for the venting and isolation of an oil well test tool drill string comprises reference pressure gas release apparatus having two spaced pistons (7, 11) located at opposite ends of the reference gas chamber (10) and blocking both a gas vent (17) to annulus and a hydraulic liquid passageway (22) extending further up the test string, the pistons being held together by a shear pin (13) until the application of a predetermined higher pressure across those pistons causes the pin to shear, allowing sequential movement of the two pistons toward each other, firstly opening the gas vent to annulus, and secondly opening the passageway (22) to a chamber (24) of hydraulic liquid. The hydraulic liquid pressure within this passageway then causes actuation of ball valve apparatus for isolating the upper section of tubing, which in turn enables transfer of hydraulic pressure to apparatus for venting the contents of the tubing to annulus.

Abstract: A papermakers' felt of the batt-on-mesh type wherein the mesh layer is a fabric formed from machine direction yarns in combination with cross-machine direction yarns. The cross-machine direction yarns are multifilament yarns with a polyurethane coating thereon.

Abstract: A papermakers wet felt comprising a three layer fabric having a first or lower layer which defines a machine roll contacting surface, a second or intermediate layer, and a third or top layer which defines a paper-receiving surface. The lower layer is woven of machine direction yarns which are of much greater diameter than the cross machine direction yarns. The intermediate layer is also woven, and adds stability and strength to the felt while providing void areas for drainage. The top layer comprises a batt or fleece of non-woven batting material.Also disclosed is a method of making the papermakers felt wherein the lower and intermediate cloths are separately woven and then associated with each other so that the inner surface of the intermediate layer contacts the outer surface of the bottom layer. The associating of the two layers takes place on a conventional fiber locker or needling machine associated with a conventional stretching device.