Tech Report

CT-Conveyed Distributed Temperature Sensing Finds Significant Leak at 9,875 ft in a 20-Stage Horizontal Well

Published: 08/28/2014

Tech Report

CT-Conveyed Distributed Temperature Sensing Finds Significant Leak at 9,875 ft in a 20-Stage Horizontal Well

Published: 08/28/2014

Graph: CT-Conveyed Distributed Temperature Sensing Finds Significant Leak at 9,875 ft in a 20-Stage Horizontal Well

Temperature changes only above Port #17 depth indicates that a leak in the completion at this depth. Based on the DTS results, a subsequent well workover plan was developed.

Location

Canada, North America

Details

Alberta, Canada
Harmattan Field

Lithology
Sandstone, shale

Reservoir
Cardium

Temperature
143.6 degF [62 degC]

Well depth
13,537 ft [4,126 m]

Pressure
3,481 psi [24 MPa]

Completion size
4.5 in [114.3 mm]

CT string size
1.75 in [44.5 mm]

Background

After successfully fracturing the first two zones of a 20-stage horizontal well in Alberta, Canada, the operator was unable to confirm port shifting for subsequent zones and achieve designed stimulation pump rates. Coil Tubing Services conducted three distributed temperature sensing (DTS) surveys using the ACTive Profiling live CT DTS service and used THERMA thermal modeling and analysis DTS software to uncover the cause. A significant leak was found at 9,875 ft [3,010 m], which matched the depth of port 17, with 100% of the fluid lost to this zone. Further well workover plan was developed based on the DTS results.

Products Used

ACTive DTS

Distributed temperature measurement and inversion analysis

Quantify the intake profile of treatment fluid along the wellbore.

THERMA

Distributed temperature and acoustic sensing (DTS and DAS) analysis software

Improve downhole understanding by visualizing and analyzing distributed wellbore temperature profiles and acoustic data.