A hydraulic fracturing plan executable by a hydraulic fracturing system to hydraulically fracture a plurality of oil and gas wells. In one or more embodiments, the execution of the hydraulic fracturing plan implements the following steps: communicating fluid to a first well via a manifold and a first valve, the first valve being associated with both the manifold and the first well; and, in response to determining that the fluid communicated via the manifold has satisfied one or more conditions: opening a second valve; communicating fluid to a second well via the second valve; and closing the first valve after opening the second valve.

Methods and apparatus according to which a first valve is opened, or kept open, the first valve being part of a wellhead including a flow component above the first valve. The method may further include detecting a state of the first valve and, in response to detecting the state of the first valve, metering an amount of grease to the first valve. In addition, or instead, the method may further include opening, or keeping open, a second valve, the second valve being operably coupled to the wellhead and positioned above the flow component, and, after opening, or keeping open, each of the first and second valves, detecting whether the second valve is open or closed, in response to detecting that the second valve is open, preventing the first valve from being closed, and in response to detecting that the second valve is closed, allowing the first valve to be closed.

A lubrication device, a lubrication system and a method are for applying a lubricant from a lubricating-fluid reservoir to an internal threaded portion of a pipe body. The lubrication device includes: a rotary device having: first and second coupling parts, and fluid passage for carrying the lubricant from the first coupling part to the second coupling part. The first and the second coupling parts are arranged to rotate relative to each other around an axis that coincides in the main with the longitudinal axis of the pipe body. An applicator body is connected to the second coupling part to allow rotation around the rotational axis of the rotary device. The applicator body has a fluid passage with an outlet for carrying the fluid to the applicator surface as the fluid passage in the applicator body is in fluid communication with a corresponding fluid passage in the rotary device.

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

Methods and apparatus according to which a first valve is opened, or kept open, the first valve being part of a wellhead including a flow component above the first valve. The method may further include detecting a state of the first valve and, in response to detecting the state of the first valve, metering an amount of grease to the first valve. In addition, or instead, the method may further include opening, or keeping open, a second valve, the second valve being operably coupled to the wellhead and positioned above the flow component, and, after opening, or keeping open, each of the first and second valves, detecting whether the second valve is open or closed, in response to detecting that the second valve is open, preventing the first valve from being closed, and in response to detecting that the second valve is closed, allowing the first valve to be closed.

A system and methods according to which a controller communicates control signals to a first frac leg, which includes a wellhead operably associated with a first wellbore, a valve operably coupled to the wellhead, opposite the first wellbore, a frac line operably coupled to the wellhead, and a zipper module operably coupled to the frac line, opposite the wellhead. The first frac leg includes a first sub-controller that receives control signals from the controller. A grease system lubricates the first frac leg and the zipper module. The grease system includes a second sub-controller that receives control signals from the controller. A second frac leg is operably associated with a second wellbore. The second frac leg includes a third sub-controller that receives control signals from the controller. The first, second, and/or third sub-controllers may receive control signals from the controller via a communication bus.

Methods of lubricating fracking valves on a wellhead include mounting a distribution manifold of a grease distribution system on, adjacent to or remotely with respect to the wellhead, the distribution manifold having a plurality of manifold valves; selecting at least one of the fracking valves for lubrication; coupling at least one of the plurality of manifold valves of the grease distribution system to the at least one of the fracking valves; coupling a grease pump to the at least one of the plurality of manifold valves; opening the at least one of the plurality of manifold valves; and distributing grease from the grease pump through the at least one of the plurality of manifold valves to the at least one of the fracking valves by operation of the grease pump.

Provided is a mixer faucet configured such that a lubricant can be effectively supplied. The mixer faucet includes a fixed valve body and a movable valve body. The fixed valve body includes a hot water supply hole, a cold water supply hole, a drain hole, a first sliding surface, and a lubricant retention portion. At least a part of the lubricant retention portion is provided in a circumferentially extended region of the hot water supply hole and a circumferentially extended region of the cold water supply hole. In the circumferentially extended region, only the first sliding surface is present between the hot water supply hole and the lubricant retention portion. In the circumferentially extended region, only the first sliding surface is present between the cold water supply hole and the lubricant retention portion.

A lubricating tube includes an inner surrounding surface that has a non-circular cross-section, angularly spaced-apart inner lubricant-storing recesses, and guide surface portions each of which is interconnected between two adjacent ones of the inner lubricant-storing recesses. The inner lubricant-storing recesses and the guide surface portions constitute the inner surrounding surface and cooperatively define a roller passage hole. The inner lubricant-storing recesses are indented from the guide surface portions toward the outer surrounding surface. A slide rail device having the lubricating tube is also disclosed.

An electric power tool includes a holder, a motor, and a transmission mechanism. The motor includes a stator and a rotor. The rotor includes a rotary shaft and a rotor body. The rotary shaft is coupled to the transmission mechanism. The rotator includes at least the rotor body. The rotator rotates. The electric power tool further includes an absorbing member. The absorbing member has a property to absorb a lubricant. The absorbing member is arranged between the rotator and the transmission mechanism.