A hydraulic fracturing plan executable by a hydraulic fracturing system to hydraulically fracture a plurality of oil and gas wells.

A hydraulic fracturing plan executable by a hydraulic fracturing system to hydraulically fracture a plurality of oil and gas wells.

A rolling bearing device includes a first bearing section including a first outer ring, a first inner ring, and a plurality of balls, each of which is made of metal, and a second bearing section including a second outer ring, a second inner ring, and a plurality of balls, each of which is made of metal. The first inner ring and the second inner ring are electrically connected to each other, and the first outer ring and the second outer ring are electrically insulated from each other. The first outer ring is provided with an input contact for an electric signal, and the second outer ring is provided with an output contact for the electric signal.

A hydraulic fracturing plan executable by a hydraulic fracturing system to hydraulically fracture a plurality of oil and gas wells.

A hydraulic fracturing plan executable by a hydraulic fracturing system to hydraulically fracture a plurality of oil and gas wells.

An apparatus, system, and method for bleeding off a hydraulic fracturing manifold used in oil and gas extraction operations.

An apparatus, system, and method for bleeding off a hydraulic fracturing manifold used in oil and gas extraction operations.

A retainer is rotationally driven about a axis of a ball bearing, and convex areas having pockets provided therein along a ball pitch circle of the retainer and concave areas between adjacent pockets is detected by a sensor. Grease is discharged according to phases of the convex areas and concave areas in the rotationally driven retainer from a dispenser having grease discharge ports arranged to face an annular space.

Grease distribution systems for lubricating a plurality of fracking valves on a wellhead include a distribution manifold configured for mounting on or adjacent to the wellhead, stand mount, mobile skid, grease skid or trailer. The distribution manifold includes a plurality of manifold valves configured for coupling in fluid communication with the fracking valves, respectively, on the wellhead. A grease pump is disposed in fluid communication with the distribution manifold. Methods of lubricating fracking valves on a wellhead are also disclosed.

Grease distribution systems for lubricating a plurality of fracking valves on a wellhead include a distribution manifold configured for mounting on or adjacent to the wellhead, stand mount, mobile skid, grease skid or trailer. The distribution manifold includes a plurality of manifold valves configured for coupling in fluid communication with the fracking valves, respectively, on the wellhead. A grease pump is disposed in fluid communication with the distribution manifold. Methods of lubricating fracking valves on a wellhead are also disclosed.