| 摘要 |
<p>A variable offset joint (10) is provided for downhole tools (20), including a first downhole member (30), a second downhole member (40), and at least one intermediate element (52, 54) pivotally coupled at a first end to the first downhole member (30) and at a second end to the second downhole member (40). The variable offset joint (10) further includes a coupler member (60) adapted to maintain a predetermined lateral offset (D1, D2) between the first and second downhole members (30, 40). The coupler member (60) further includes a zone of weakness (66) adapted to fracture when a tensile force applied thereto exceeds a predetermined threshold. In one example, a plurality of intermediate elements (52, 54) are each pivotally coupled to the first and second downhole members (30, 40). In another example, the coupler member (60) extends between at least two of the plurality of intermediate elements (52, 54). In another example, adjusting a length (L) of the coupler member (60) selectively adjusts the predetermined lateral offset (D1, D2).</p> |
