Riser reentry whipstock

Abstract

The invention relates to the technical field of underwater detection devices, and particularly discloses a riser reentry whipstock. The whipstock comprises an inclined plane body, a straightening unit, a sleeve, an anchoring unit and a lead-in head. The inclined plane body is fixed to a casing cutting opening, the inclined plane body is straightened through the straightening unit, and the inclinedplane body is provided with a longitudinal groove and a transverse groove to play a role in guiding in a riser and a drilling tool. The straightening unit is provided with a straightening cone plate,and performs the preliminary fixing while straightening the inclined plane body; the sleeve is provided with a hollow hole, and cementing sealing can be conducted after the whipstock is disengaged from a hand; the anchoring unit is arranged below the straightening unit and can fix the depth and direction of the inclined plane body; the leading-in head is located below the anchoring unit, and thebottom of the leading-in head is a conical head, so it is guaranteed that the whipstock smoothly descends into a casing cutting opening. The whipstock achieves the reutilization of an abandoned well groove, and effectively solves the problem that an inner-layer casing pipe is not centered; the longitudinal groove and the transverse groove provide guidance for the waterproof guide pipe and a drilling tool, and the risks of well hole finding and orientation deviation are avoided.

Description

technical field [0001] The invention relates to the technical field of drilling tools, in particular to a riser reentry deflector. Background technique [0002] On offshore oil production platforms, slots are generally used up due to cost and space constraints, but slots are still needed to develop oil reservoirs with proven reserves according to the production plan. Factors that produce abandoned well slots. [0003] At present, the main method of adding slots on offshore platforms is to build external well slots, which is costly and at the same time increases the load of the jacket platform, and some platforms can no longer continue to hang external well slots; secondly, opening windows for water-resisting conduits requires not only recycling the inner casing Complicated processes such as pipe, outer casing, sleeve milling and forging milling also increase the risk of subsequent window passing and orientation deviation. [0004] Therefore, there is an urgent need for a r...

AI Technical Summary

Problems solved by technology

[0002] On offshore oil production platforms, slots are generally used up due to cost and space constraints, but slots are still needed to develop oil reservoirs with proven reserves according to the production plan. Factors that create abandoned well slots

[0003] At present, the main method of adding slots on offshore platforms is to build external well slots, which is costly and at the same time increases the load of the jacket platform, and some platforms can no longer continue to hang external well slots; secondly, opening windows for water-resisting conduits requires not only recycling the inner casing Complicated processes such as pipe, outer casing, sleeve milling and forging milling also increase the risk of subsequent window passing and orientation deviation

Images