Abstract: The present disclosure belongs to the field of drilling fluid additives, and particularly relates to a phase-change heat storage microcapsule material suitable for cooling a drilling fluid and a preparation method therefor. The phase-change heat storage microcapsule material of the present disclosure consists of a high molecular wall material wrapped outside, a phase-change heat storage material as a core material and nano-graphite doped therein, and the microcapsules have an overall size within the range from 20 ?m to 80 ?m.

Abstract: A lightning strike probability-based coordinated power control method for an energy storage system and a load adjusts output power of an energy storage system and a regulatable load based on a real-time predicted lightning strike probability. This reduces a correlation between a power grid in a lightning region and an external power grid, minimizes impact of a lightning strike if any on the external power grid, and decreases an economic loss due to the lightning strike in the lightning region. The present disclosure establishes a relationship between the output power of the energy storage system, the regulated power of the regulatable load, and a lightning strike probability in a same region, and then regulates the power of the energy storage system and the regulatable load in real time based on the lightning strike probability.

Abstract: The present invention relates to an experimental device for testing the lubricity in horizontal well drilling with a cuttings bed taken into consideration, which comprises a simulated wellbore with a pulley provided at one end and a hydraulic cylinder fixed and a drill rod mounted at the other end; a cuttings feeding port is arranged above the simulated wellbore; a low end of the simulated wellbore is connected with a liquid return pipeline; the simulated wellbore is provided with an ultrasonic probe and is connected with a rock core holder. The present invention is in line with the actual operating conditions because it not only takes consideration of the friction force between the drill string and the drilling fluid, wellbore wall and slurry cake, but also takes consideration of the friction force between the drill string and the cuttings bed.

Abstract: Disclosed is an experimental device for testing the lubricity in horizontal well drilling with a cuttings bed taken into consideration, which comprises a simulated wellbore with a pulley provided at one end and a hydraulic cylinder fixed and a drill rod mounted at the other end, wherein the drill rod is connected with a driving mechanism and a rotating mechanism, and is provided with thrust and torque sensors; a cuttings feeding port is arranged above the simulated wellbore and connected to a slurry tank through a liquid feeding pipeline, and a high-pressure pump, a flowmeter and a pressure sensor are arranged on the liquid feeding pipeline; the low end of the simulated wellbore is connected with a liquid return pipeline, and a temperature-reducing and pressure-reducing mechanism, a flowmeter and a transfer pump are arranged on the liquid return pipeline; the simulated wellbore is provided with an ultrasonic probe and is connected with a rock core holder that is provided with a heating mechanism, a rock core