Patent ID: 9689255
Date: 2017-06-27
CPC Classifications: E21B

Claim:
1. A well logging apparatus having an outer surface, the outer surface having a first side for engaging a borehole surface of a borehole and having a second side opposite the first side, the well logging apparatus comprising: a main stabilizer including a pair of moveable, rigid, main stabilizer arms that each are pivotably secured adjacent to one another and equally disposed about a first point on the second side of the outer surface at one end to the well logging apparatus so as to be moveable between a relatively retracted position on the one hand and a relatively advanced position on the other in which the main stabilizer arms diverge from one another and protrude from the second side of the outer surface of the well logging apparatus so as to present a pair of main arm free ends that are spaced from the outer surface of the well logging apparatus and are engageable with the borehole surface of the borehole; and a mechanism for effecting coordinated, powered, linked movement of the main stabilizer arms between the retracted and advanced positions, wherein the well logging apparatus is capable of being withdrawn along said borehole with the main stabilizer arms forcing the first side of the outer surface against the borehole surface when the main arm free ends are engaged with said borehole surface.