Halliburton Company

Other

Robert T Evans

David L Farley

Richard Lee Giroux

Burchus Q Barrington

Theron A Scott

Philip C Richards

Bernard L Hackney

A method for communicating between a first communication terminal and any selected one of a group of second remotely disposed compatible communication terminals using a designated communication service of a designated common carrier having at least one toll switch connectable via local telephone company central offices between the first terminal and any selected second terminal. Each second terminal has at least one different postal zip code assigned thereto that designates the geographical location thereof. Each second terminal is provided with means to receive a designated security code of digits from a toll switch which identifies the designated service, means to record the time, date and type of call identified by the designated security code, means to initiate receipt of any message transmitted thereto, means responsive to the end of any message transmitted thereto to terminate reception and to send an end of reception signal to said toll switch.

Enhanced communication services and apparatus

An annulus pressure operated ratchet device for use in a well bore. A mandrel includes an upwardly-directed elastomeric cup which is slidingly received over the mandrel. A sleeve is slidingly received over the mandrel beneath the cup and a ratchet disposed between the sleeve and the mandrel permits only downward movement of the sleeve. An elastomeric packer is received about the mandrel between the sleeve and an upwardly-directed shoulder. Annulus pressure urges the cup and sleeve downwardly to compress the packer thereby sealingly engaging it with the casing. The shoulder beneath the packer is threadably engaged with the mandrel by a left-hand thread. Right-hand mandrel rotation unthreads the connection thereby releasing the packer.

Annulus pressure operated ratchet device

A bridge plug apparatus includes a mandrel assembly having an operating fluid passageway disposed therein. A releasable coupling assembly has an upper end adapted to be connected to a tubing string and has a lower portion adapted to be releasably connected to the mandrel assembly. An annular packer is disposed about the mandrel assembly. A mechanical first slip assembly is connected to the mandrel assembly below the packer. A hydraulic second slip assembly is connected to the mandrel assembly above the packer. A power piston is disposed about the mandrel assembly for longitudinally compressing and radially expanding the packer to seal the packer in response to an increase in fluid pressure within the operating fluid passageway of the mandrel assembly. A hydraulically actuatable releasing device is provided for releasing a latched connection between the coupling assembly and the mandrel assembly. This releasing device is defined upon a power sleeve slidably disposed about the mandrel assembly. This power sleeve also has defined thereon a first valve portion for closing a bypass passage of the mandrel assembly and a second valve portion for trapping fluid under pressure within a portion of the operating fluid passageway of the mandrel assembly communicated with the hydraulic second slip assembly and the power piston.

Hydraulically set and released bridge plug

An improved retrievable compression set straddle packer assembly for use in oil and gas wells. The straddle packer assembly comprises an hydraulic slip assembly, an injection mandrel assembly, a packer assembly, a mechanical slip assembly, a drag block assembly, and a bypass assembly.

Retrievable straddle packer

An access valve for communicating a wire line pressure sensing probe with a subsurface formation of a well to conduct continuously monitored shut in pressure tests on said subsurface formation. The access valve includes a tubular body having a cylindrical inner surface. A first passage communicates the subsurface formation with the cylindrical inner surface of the tubular body. A sliding valve sleeve has a cylindrical outer surface slidably received in said cylindrical inner surface of said tubular body, and has a valve sleeve port disposed through a side wall thereof communicating said cylindrical outer surface of said sliding valve sleeve with a cylindrical inner surface of said sliding valve sleeve. The sliding valve sleeve is slidable between a closed position wherein the valve sleeve port is in fluid isolation from the first passage, and an open position wherein the valve sleeve port is in fluid communication with the first passage. A probe nose member has a cylindrical outer surface adapted for sliding insertion within said cylindrical inner surface of said sliding valve sleeve, and includes a chamber for receiving a sensing device and a second passage for communicating the chamber with the valve sleeve port when the probe nose member is fully inserted in the sliding valve sleeve. A bypass allows fluid from the subsurface formation to bypass the tubular body, valve sleeve and probe nose member so that formation pressure may be monitored during either shut in or open flow conditions.

Access valve for drill stem testing

Disclosed is a circulation valve for use in the testing of an oil well wherein the circulation valve may be reclosed by application of well annulus pressure to allow a subsequent treating or testing program. A spring means is subjected to well annulus pressure on two ends of a volume of fluid. The volume of fluid is divided by a dividing means which includes pressure relief means such that fluid on one side of the dividing means is either higher or lower than the well annulus pressure. This different pressure is applied to one set of a piston means, and the other side of the piston means is subject to well annulus pressure such that movement of the piston means may be controlled by changing the well annulus pressure. An indexing means is additionally disclosed which controls opening of the circulation valve after a selected number of piston means movements, and which closes the circulation valve upon a selected movement of said piston means when the circulation valve is in the open condition.

Reclosable circulation valve for use in oil well testing

In a well testing tool having a spring whose biasing force is supplemented by the hydrostatic pressure in the well annulus at the testing depth, a method and apparatus for isolating the spring from the pressure in the well annulus utilizing the pressure differential between the well annulus and the testing tool bore which exists after the formation is isolated. An insolation valve is provided whose closing force is generated by isolating the testing tool bore from the well annulus, and then increasing the well annulus pressure above the hydrostatic pressure. The pressure differential thus created is utilized to close the valve. The opening force is generated by compressing a spring as the valve is closed. Thus, an isolation valve is provided which is normally open and which closes only after the well annulus pressure exceeds a reference pressure trapped in the bore of the testing tool by a predetermined amount.

Growing community of inventors

Duncan, OK, United States of America

Robert T Evans