WELL REFERENCE APPARATUS AND METHOD

摘要

The reference member (10) provides a permanent reference for the depth and orientation of all well operations and includes a body (11) with an engaging surface (13) for an attaching engagement to the interior surface of an existing casing in a borehole and an orienting surface for orienting well tools within the cased borehole. No sealing engagement is required with the casing (28). The engaging surface (13) on the body has a first non-engaged position where the engaging surface (13) does not engage the casing (28) and an engaged position where the engaging surface (13) does engage the casing (28) which causes adequate engagement between the body (11) and the casing (28) to permanently dispose the well reference member (10) within the casing (28). The well reference member (10) further includes an actuation member (19) for actuating the engaging surface (13) from the non-engaged position to the engaged position. The actuation member (19) may be an expansion member which expands the body (11) having an engaging surface (13) into engagement with the casing (28) or which expands engaging surfaces (13), reciprocably mounted on the body (11), into engagement with the casing (28).