ADJUSTABLE GAUGE DOWNHOLE DRILLING ASSEMBLY

摘要

A downhole drilling assembly including a housing having an upper end for connection to a drill string and a lower end, a fluid passage extending through the housing from the upper end to the lower end, a power unit contained within t he housing, a drive assembly extending within the housing between the power uni t and the lower end of the housing such that a mandrel chamber is defined between the drive assembly and the housing, a radially movable first stabilizer associated wit h the housing and located between the power unit and the lower end of the housing, an axially movable mandrel contained within the mandrel chamber, the mandrel being associated with a stabilizer actuator for causing radial movement of the fir st stabilizer in response to axial movement of the mandrel, and a sensor apparatus located between the power unit and the lower end of the housing for sensing at least one drillin g parameter. The drilling assembly may also include a second stabilizer located between t he power unit and the lower end of the housing and a bent housing assembly located between the power unit and the lower end of the housing.