Schlumberger Technology Corporation

Baker Hughes Corporation

Li Guo

Anton Kolyshkin

Geoffrey Charles Downton

Ping Duan

Jiaxiang Ren

David Peter Gerrard

James Edward Goodson

Samba Ba

Robert Little

Maxim Pushkarev

A mud motor includes a rotor and a stator. Drilling fluid received by cavities of the mud motor drives the rotor to rotate within the stator. The rotor includes one or more rotor lobes extending helically and defining a rotor pitch. The stator includes two or more stator lobes extending helically and defining a stator pitch. The rotor and the stator together define a tapered profile of the mud motor that varies proceeding from a top end of the mud motor to a bottom end of the mud motor. At least one of the rotor pitch or the stator pitch vary as proceeding from the top end of the mud motor to the bottom end of the mud motor.

Mud motor or progressive cavity pump with varying pitch and taper

A rotor for a mud motor includes a core having a first outer shape, and a shell positioned around the core, the shell having a second outer shape that is different from the first outer shape, the second outer shape defining one or more lobes and one or more cavities that are configured to engage a bore of a stator during rotation of the rotor relative to the stator. A thickness of the shell varies as proceeding around the core, from a non-zero minimum thickness to a maximum thickness.

Mud motor rotor with core and shell

A downhole element to isolate or complete a wellbore includes a shape memory material including polyphenylene sulfide. The polyphenylene sulfide is the cure product of being cured at a temperature of about 200&#xb0; C. to about 400&#xb0; C., for a total time of less than or equal to 200 hours. The shape memory material is thermally activated between an actuated and unactuated shape, and the polyphenylene sulfide in the shape memory material is a closed cell foam, open cell foam, or solid.

Shaped memory polyphenylene sulfide (PPS) for downhole packer applications

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Houston, TX, United States of America

Li Guo