Schlumberger

FPIT Free-Point Indicator Tool

Overview Library

Combined free-point indicator and backoff system recovers more pipe more effectively

The FPIT free-point indictator tool with combined backoff shot determines the free point in stuck drillpipe, drill collars, tubing, or casing and then provides the force that frees the stuck assembly. The FPIT tool provides accurate information about the stuck assembly, saving you both time and money because you can make immediate and informed decisions.

During the course of drilling or workover, the work string can become stuck in the borehole for many reasons: hole conditions, formation characteristics, mud properties, mechanical problems, assembly tools, or operational error. Saving the well and reducing expense means freeing the stuck assemblies quickly and efficiently.

The FPIT tool determines how much of the stuck assembly may be freed. In combination with a backoff shot, the FPIT tool efficiently frees the stuck section of the assembly by applying an explosive shock inside a tool joint to which left-hand torque has been applied. Up to seven strands of Primacord detonating cord can be used for the combined operation’s explosive load.

Stretch and torque measurements

Correctly choosing the backoff depth is a crucial part of the pipe recovery operation. The FPIT tool consists of a sensor section between two anchors. The sensor package includes two sensors. One sensor detects stretch and is unaffected by torque; the other detects torque.

Independent and sequential torque and stretch measurements result in accurate free point determination. With the measurements from both the sensors in observed in real time, the application of stretch and torque is effectively guided to give the best chance for a successful backoff on the first attempt.

Full measurement integration

Control of the FPIT tool is customized from a surface unit that integrates the driller’s parameters with the measurements acquired during tool operational sequences. The percentage of the free torque and stretch is automatically computed at each measurement point and displayed on the surface.

The operation is digitally recorded and can be monitored in the wireline surface unit. InterACT global connectivity, collaboration, and information service can also be used for remote monitoring at the operator’s offices.

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Immediate, Informed Stuck Assembly Decisions

The Schlumberger FPIT tool combined with backoff service gives you the capability you need to make immediate downhole decisions about freeing a stuck assembly.By monitoring the stretch and torque that is effectively applied downhole during the backoff stage, the Schlumberger FPIT tool and backoff service provides the best chance for successful backoff on the first attempt.
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