METHODS FOR IDENTIFYING MUD MOTOR STALL EVENTS DURING BOREHOLE DRILLING OPERATIONS

    公开(公告)号:WO2023064668A1

    公开(公告)日:2023-04-20

    申请号:PCT/US2022/076663

    申请日:2022-09-19

    Abstract: Methods for identifying mud motor stall events are provided herein. One method includes receiving drilling sensor data including a pressure measurement signal, calculating a smoothed pressure signal, calculating a pressure fluctuation signal, determining a pressure fluctuation distribution dataset, and calculating a set of statistical values from the pressure fluctuation distribution dataset, where the set includes a pressure fluctuation value for a selected percentile value and probability distribution parameters that characterize a selected theoretical probability distribution function. The method also includes calculating a theoretical pressure fluctuation value for another selected percentile value using the probability distribution parameters, identifying mud motor stall event(s) when a pressure measurement value from the pressure fluctuation signal is greater than the calculated pressure fluctuation value and the calculated theoretical pressure fluctuation value multiplied by a prescribed numerical value, and utilizing the identified mud motor stall event(s) to manage the borehole drilling operation.

    BLENDING METHODS FOR RIGID VINYL POLYMERS
    19.
    发明申请

    公开(公告)号:WO2023069314A1

    公开(公告)日:2023-04-27

    申请号:PCT/US2022/046690

    申请日:2022-10-14

    Abstract: Blending of polyvinylchloride (PVC) and other rigid polymers may be facilitated using lubricant compositions comprising linear alpha olefins (LAOs) or compounds derived from LAOs. PVC blending methods may comprise: combining PVC and a lubricant composition to form a mixture, and blending the mixture to form a lubricated PVC blend, in which the mixture contains an effective amount of the lubricant composition to provide a fusion temperature for the lubricated PVC blend of about 190°C or below as determined by torque rheometry at 65 rpm. The lubricant composition may comprise one or more C18+ linear alpha olefins (LAOs) having a kinematic viscosity of about 4 cSt or less at 135°C, or one or more LAO dimers formed from the one or more C18+ LAOs, the one or more LAO dimers having an internal olefin and a kinematic viscosity of about 6 cSt or less at 135°C, or reduced LAO dimers.

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