Weatherford/lamb, Inc.

Schlumberger Technology Corporation

Smith International, Inc.

Eric T Johnson

Michael J Foster

Roddie Robert Smith

Lance D Underwood

Bruce H Storm, Jr

Bulent Finci

Peter Wells

John Lee Emerson

Raleigh Fisher

Akio Kita

Joseph Ross Rials

James G Aivalis

Jimmy Duane Wiens

Jonathan Macrae

Thomas Oskamp

A downhole motor drive shaft assembly includes a drive shaft having a longitudinal rotational axis, a plurality of drive key sockets, an end housing having a longitudinal rotational axis, a plurality of circumferentially spaced axial keyways, and a concave spherical thrust bearing surface, and a drive key operatively connecting each drive key socket with a respective axial keyway for transferring torque from the drive shaft to the end housing. The drive key includes a substantially planar drive face slidably engaging the axial keyway, and a radiused, cylindrical back portion rotatably engaging the drive key socket, the substantially planar drive face and radiused, cylindrical back portion forming a nominal half-circle.

U-joint for a downhole motor drive shaft

Embodiments of the present invention generally relate to methods and systems for logging through a drillstring. In one embodiment, a method of logging an exposed formation includes drilling a wellbore by rotating a cutting tool disposed on an end of a drillstring and injecting drilling fluid through the drillstring; deploying a BHA through the drillstring, the BHA including a logging tool; forming a bore through the cutting tool; inserting the logging tool through the bore; longitudinally connecting the BHA to the drillstring; and logging the exposed formation using the logging tool while tripping the drillstring into or from the wellbore.

Through drillstring logging systems and methods

A downhole valve has a closure device (e.g., one or more flappers) for closing off the valve. A no-go actuation mechanism protects the flappers from damage. When the flappers are closed, the mechanism prevents a tool from passing into the valve and causing damage to the flappers. Yet, the mechanism may open the valve's flappers when the tool string is forced into the valve. When the valve has successfully opened, then the mechanism moves out of the way of the toolstring so it can pass through the valve. For the mechanically operated valves, operators use a shifting profile in the valve only in the upward direction to return the valve to the closed position. For hydraulic actuated valves, hydraulic pressure may be used or exhausted, depending on the design, to allow the flappers to go closed. Once the flappers have closed, the no-go mechanism is once again realized.

Downhole safety valve having flapper and protected opening procedure

In one embodiment, a flowback tool for running a tubular string into a wellbore includes a tubular housing having a bore therethrough and a tubular mandrel. The mandrel: has a bore therethrough in communication with the housing bore, is longitudinally movable relative to the housing, is torsionally coupled to the housing, and has a threaded coupling for engaging a threaded coupling of the tubular string. The flowback tool further includes a nose: longitudinally coupled to the housing, operable to receive an end of the tubular string, and including a seal operable to engage a surface of the tubular string, thereby providing fluid communication between a bore of the tubular string and the mandrel bore. The flowback tool further includes an actuator operable to move the mandrel and the nose longitudinally relative to the housing for engaging and disengaging the tubular string.

Flowback tool

The present invention generally relates to a method and an apparatus for selectively isolating a portion of a wellbore. In one aspect, an apparatus for isolating a zone in a wellbore is provided. The apparatus includes a body having a bore. The apparatus further includes a first flapper member and a second flapper member, each flapper member selectively rotatable between an open position and a closed position. Additionally, the apparatus includes a flapper latch assembly disposed in the bore, the flapper latch assembly movable between an unlocked position and a locked position, wherein the flapper latch assembly is configured to hold the first flapper member in the closed position when the flapper latch assembly is in the locked position. In another aspect, a method for selectively isolating a zone in a wellbore is provided. In yet a further aspect, a flapper latch assembly for use with a flapper valve is provided.

Flapper latch

Growing community of inventors

Sugar Land, TX, United States of America

Eric T Johnson