Wwt North America Holdings, Inc.

Wwt International, Inc.

Sarah Mitchell

Norman Bruce Moore

Garrett C Casassa

Duane Bloom

N Bruce Moore

Philip Wayne Mock

Rudolph Ernst Krueger, Iv

Eric Gollmyer

Andrew Trowbridge

Eric J O'Neal

Rudolph Ernest Krueger, Iv

Duane Thomas Bloom

A casing shoe having a composite body portion, a coupling portion attached to one end of the body portion, and a one-way check valve assembly positioned in the body portion, the valve assembly and body portion having a centerline nozzle and a plurality of circumferentially spaced smaller diameter nozzles positioned around the centerline nozzle.

Fail-safe high velocity flow casing shoe

An oscillating mud motor having a valve section and a piston section positioned within a hollow cylindrical housing wherein the valve section comprises a timing cycle valve and a spool valve which hydraulically controls rotational movement of a piston on a central shaft in the piston section for linear reciprocation within the housing.

Oscillating mud motor

A flexible wellbore casing guide having a tubular body positioned at an end of a wellbore casing having a lower stiffness than the wellbore casing, the casing guide can be a section of fiber reinforced composite tubing.

Flexible casing guide running tool

A drillable reamer shoe having a reamer body and a nose section having a metallic cage containing a plurality of ceramic inserts made from silicon nitride or aluminum oxide. The drillable reamer shoe is positioned on an end of a flexible wellbore casing guide comprising a tubular body having a stiffness lower than a wellbore casing.

Reamer shoe attachment for flexible casing shoe

A gripper mechanism for a downhole tool is disclosed that includes a linkage mechanism. In operation, an axial force generated by a power section of the gripper expands the linkage mechanism, which applies a radial force to the interior surface of a wellbore or passage. For certain expansion diameters, the expansion force can be primarily transmitted from a roller-ramp interface expanding the linkage. For other expansion diameters, the expansion force can be primarily provided by expansion of the linkage, in which during a first stage the expansion force is primarily provided by a first link and during a second stage the expansion force is primarily provided by a second link. Thus, the gripper can provide a desired expansion force over a large range of expansion diameters.

High expansion or dual link gripper

A buoyancy module assembly reduces the effective weight of a sub-sea conduit used in a deep-water wellbore drilling installation. The assembly includes a buoyant sleeve positioned around the conduit between upper and lower stop collar assemblies. The sleeve contains buoyant material forming most of its cross-section, with cross sectional segments thereof each encapsulated in a non-porous resinous material that forms an outer jacket around each segment. In one embodiment, a non-rotating generally circular inside diameter of the sleeve is formed by the thin layer of jacket material bonded directly to an interior reinforcing cage. A narrow gap is formed between the ID of the non-rotating sleeve and the OD of the conduit. The collar assemblies comprise an inner collar rigidly affixed to the conduit and contained within a larger diameter outer shell adapted for rotation relative to the fixed inner collar.

Non-rotating buoyancy modules for sub-sea conduits

A non-rotating downhole sleeve adapted for casing centralization in a borehole. The sleeve includes a tubular body made of hard plastic with integrally formed helical blades positioned around its outer surface and an inner surface which allows drilling fluid to circulate to form a non-rotating fluid bearing between the sleeve and the casing. The tubular sleeve comprises a continuous non-hinged wall structure for surrounding the casing. The non-rotating centralizer sleeve reduces sliding and rotating torque at the surface while drilling the casing, for example, with minimal obstruction to drilling fluid passing between the casing and the surrounding borehole.

Non-rotating casing centralizer

A non-rotating downhole sleeve adapted for open hole drilling and/or casing centralization. The sleeve includes a tubular body made of hard plastic with integrally formed helical blades positioned around its outer surface and an inner surface configuration which allows drilling fluid circulation to form a non-rotating fluid bearing between the sleeve and the drill pipe or casing. The helical blades reduce sliding and rotating torque while drilling, with minimal obstruction to drilling fluid passing through the borehole between the blades.

Open hole non-rotating sleeve and assembly

A non-rotating drill pipe protector sleeve is molded in situ around a drill pipe tubing. The inner surface of the molded protector sleeve can be shaped to form a fluid bearing during use. Fixed stop collars may be molded in situ in the same mold and bonded to the tubing at opposing ends of the molded sleeve. Alternatively, a flexible sleeve liner made from a material having a hardness less than that of the sleeve's molding material can be used as a mold insert around the tubing. The liner can be bonded to the molded sleeve material when the sleeve is molded around the liner. The interior surface of the liner can be shaped to form a fluid bearing for the inside surface of the molded sleeve. Reinforcing inserts and wear pads can be placed in the mold region of the sleeve. Chemical and/or mechanical bonding is provided between the liner reinforcement and the material from which the sleeve is molded. Reinforcing inserts and wear pads also can be placed in the mold regions for the stop collars.

In-situ method of forming a non-rotating drill pipe protector assembly

An attachment and fastener system rigidly secures a rotatable drill pipe protector (RDPP) to a drill pipe. The RDPP comprises a sleeve which is split axially along at least one side. Parallel hinge bars are contained in first and second hinge sections which wrap around the hinge bars along opposite sides of the opening in the RDPP. One hinge bar is rotatable in the first hinge section. A series of axially spaced apart bolts are held in corresponding threaded openings in the rotatable hinge bar which rotates about its axis to swing the bolts in unison between open and closed positions. The other hinge bar has a series of threaded receptor openings facing outwardly from slotted openings in the second hinge section and aligned with the bolts on the other hinge bar. The rotating hinge bar swings the bolts into alignment with the slotted openings in the other hinge, after which the bolts are tightened in the threaded receptor openings for applying a holding force around the drill pipe. The hinges which wrap around each hinge bar are formed on the ends of a reinforcing cage structure molded into the wall of the RDPP.

Growing community of inventors

Tustin, CA, United States of America

Sarah Mitchell