Abstract: A flow splitting device for gas reverse circulation drilling, including: an upper joint for connecting with a double-wall drill pipe; an inner tube which is arranged in the upper joint and defines a first passageway in communication with an inner chamber of the double-wall drill pipe, a second passageway in communication with an annular space in the double-wall drill pipe formed between the inner tube and the upper joint; a lower joint, having an upper end fixedly connected with the upper joint and a lower end for connecting with a drill tool; and a flow guiding member provided between the upper joint and the lower joint. A flexible sealing mechanism is provided outside the upper joint. The flexible sealing mechanism extends radially outward relative to the upper joint and the lower joint to form a sealing contact with a wellbore wall.

Abstract: Described embodiments provide systems and methods for automatic cluster scaling. A processor can receive a metric of a first metric type for a cluster of computing devices and an identification of a version of an application and. The processor can aggregate a metric of the first metric type for the version of the application and the metric for the cluster of computing devices to establish an third metric. The processor can determine the third metric exceeds a threshold for the first metric type for the cluster of computing devices, the threshold proportional to a capacity of the cluster of computing devices for the first metric type. The processor can increase a size of the cluster of computing devices.