Electronically activated underreamer and calliper tool

摘要

An electronically activated tool (50) comprising a tool body, cutter blocks and sensors with means for attachment to a drilling support and rotation so as to permit the simultaneous underreaming and measurement of the diameter of a wellbore (especially in oil and gas drilling) characterized by a means of activation using an electronic signal sent by mud-pulse, fiber-optics, wireless transmission or other means which may also communicate commands and receive data from the underreamer during drilling, at least one radially extendable cutter block (62) incorporating positional sensors adapted to measure the relative position of the cutter block to the tool, at least one calliper means (76) to measure wellbore diameter, all of which are inter-linked by a means of communication using receivers, sensors and microprocessors and a system that optimizes underreaming or expansion (22) by simultaneously comparing and correlating wellbore diameter data (22) and underreaming parameters in real-time or in memory.

主权项

1. A method of closed loop reaming to provide a borehole with a predetermined dimension, comprising providing a rig in contact with a reamer and a processor linked to a calliper measuring borehole dimension, thereby providing caliper data,
sensing a relative position of extendable cutter blocks using a magnetic position sensor thereby providing extendable cutter block positional data, wherein said cutter blocks are housed within a tool body and extendable from said tool body and said magnetic sensor remains housed within a tool body when said cutter blocks are extended, wherein the processor makes a comparison between said calliper data, and said extendable cutter block positional data, wherein the processor sends an alert to a user in response to the comparison to check operational parameters in order to to ensure that the borehole is accurately provided with the predetermined dimension, wherein a user is capable of making a user comparison between said caliper data, said extendable cutter block positional data, and said predetermined borehole dimension.