Abstract: A single pass filtration process for the removal of suspended solids from completion fluids used in oil or gas well drilling operations which utilizes pressure injection of these fluids into a filter having pattern filter plates.

Abstract: The disclosure relates to an improved flapper type safety valve for use in subterranean wells wherein the flapper valve is actuated from a horizontal closed position to a vertical open position by contact from a downwardly moving actuating sleeve. The top surface of the valve is elevated so that the bottom edge of the actuating sleeve always contacts the flapper valve at a position maximally spaced from the axis of its pivot mounting, thereby assuring that the opening force applied to the flapper valve has a maximum moment arm in order to overcome any fluid pressure differential existing across the flapper valve.

Abstract: The disclosure relates to a flapper type safety valve incorporating a pressure equalizing feature in the body of the flapper valve. A bypass aperture in the flapper valve communicates with a downwardly facing conical sealing surface. A conically shaped sealing plug is insertable in the bypass aperture and has a post portion projecting upwardly through such aperture. A diametral slot is provided in the top surface of the flapper valve body to mount a leaf spring which is secured to the upstanding post. An abutment element is also secured to the top end of the upstanding post and projects diametrically into the path of the actuating sleeve normally utilized to effect the opening of the flapper valve.

Abstract: A method and apparatus are provided for effecting the replacement of a cementing float shoe on the bottom of a well casing. A casing extension sleeve defines an upwardly facing locating shoulder and a seal bore adjacent such shoulder. A new or replacement float shoe is run into the well casing on the end of a tubular workstring and seated on the locating shoulder with an external seal engaging the casing seal bore. A plurality of radially expandable slip elements are provided in the replacement unit at a position above the external seal and such slips are retained in a retracted position by a retaining sleeve. Connection of the replacement cementing shoe to the workstring is achieved through a coupling sleeve having a threaded engagement with the replacement shoe and also being connected to the retaining sleeve.

Abstract: A swing chute sampler for diverting the flow of material from a mainstream comprising an external housing having upper and lower openings, a side-arm chute, a fixed internal chute and an internal swing chute pivoted near the upper edge of the opening in the main housing which communicates with the side-arm chute is described. The fixed internal chute is substantially axially aligned with the main housing and has an upper and lower opening, said lower opening preferably being below the upper edge of the side opening in the main housing.

Abstract: Well control valve to be installed in a tubing string for use in killing a well through use of fluid under pressure pumped down through the annulus surrounding the tubing string. When the annulus pressure exceeds a predetermined value, the valve is opened to permit the kill fluid to flow into and through the tubing string into the producing formation. The valve contains a closure member or disc, the upstream side of which is subject to the normal hydrostatic pressure of the fluid in the annulus, and also to an increase in the pressure of the annulus fluid above normal hydrostatic pressure, but its downstream side is subjected to atmospheric pressure initially. Accordingly, the closure member can be placed in its opened condition, as by rupturing it, when subjected to a predetermined increase in annulus pressure above the normal hydrostatic pressure, allowing the annulus kill fluid to flow into and through the tubing string to the producing formation.

Abstract: Apparatus is provided for affording transmission of liquid or gas inhibitor within and below the bore of a well packer during production of hydrocarbons in a subterranean well.

Abstract: An enclosed hammermill crusher having a closed-loop vent is described. The crusher-enclosure has an upper vent opening in the housing above the hammers where the hammer direction is upward, said vent opening communicating with a closed-loop vent duct. The lower part of the crusher housing is contiguous with a crushed particulate collector which has sloping sides and a small discharge opening cummunicating with a discharge conduit. The lower end of the vent duct connects to the discharge conduit near the collector discharge opening, preferably at about right angles to the discharge conduit. The inlet opening for aggregate material in the top of the housing is above the hammers where said hammers have a downward direction.

Abstract: Apparatus for and method of gravel packing a well, wherein a well liner is run into a well bore on a hydraulically set packer assembly which is releasably supported on a setting tool which provides a fluid flow crossover and seals which are selectively positionable within the packer body and a sealing receptacle in the liner. A ball is dropped to enable pressure to set the packer. The running tool is released and moved upwardly to a circulating position at which fluid can circulate downwardly through the running pipe string and the running tool, through the crossover to the annulus outside the liner to deposit gravel, the fluid flowing upwardly through the crossover and past the packer into the annulus outside of the running pipe string. The running tool is then moved further upwardly to position the seals for reverse circulation of fluid down the annulus outside of the running pipe string and through the crossover into the liner, and then back through the crossover into the running in pipe string.

Abstract: A subsurface safety valve for wells has a ball valve supported for rotation between open and closed positions in response to control fluid pressure supplied from the top of the well and a spring which overcomes the hydrostatic pressure of the control fluid. The ball is split and has a pressure equalizing flow passage through a ball cap initially opened before the ball is rotated, the ball valve base including a screen to preclude entry of large particles. An adjustable connection in the valve support and housing structure enables adjustment to compensate for tolerances and effect snug engagement of the ball cap with its seat. Control fluid pressure enters the pressure responsive region through a balanced sleeve. An internal spring guide has a seat adjustable relative to the valve housing to provide a smooth continuous bore when the valve is open.

Abstract: A liner provided with by-pass ports and a perforated portion or screen below the ports is secured to a suitable well packer and lowered on an outer tubing string in well casing to a location at which the screen straddles casing perforations within a producing formation, the packer being packed-off against the casing above its perforations and anchored against movement in both directions to secure the liner and its screen in place. An inner tubing string is lowered through the outer string into the liner, the inner string and liner having upper and lower seal devices, either of which is selectively engaged while the other is disengaged, or both of which are disengaged, by longitudinal movement of the inner string in the outer string and liner, to control the flow of circulating, washing, or acidizing fluids in both directions between the inner string, liner-casing annulus, and inner string-outer string annulus, and also the placement of gravel in the liner-casing annulus.