CSUR Technical Webinar: Pressure-Based Diagnostics For Evaluating Treatment Confinement In North Montney, Jan. 25, 2022
In multiple-stage hydraulic fracturing treatments performed in horizontal wells, treatment confinement is the state in which fracturing fluid and proppant flow out of the wellbore only through the specific perforations targeted for the fracturing stage. The terms treatment confinement and treatment isolation are synonymous. Isolation from previously treated intervals is a necessary condition for efficient treatment along the lateral. Failure to confine fracturing stages can be a result of failure of the frac plug to maintain a seal or the development of casing breaches (holes) in the proximity of the frac plug. Both conditions can be strongly impacted by proppant induced erosion.
This presentation is based on a case study in which casing erosion and breaches were exhibited in fracture treated horizontal wells in the northern part of the Montney play. Integrated diagnostic methods based on data from treating pressure analysis, fiberoptic measurements, and downhole imaging were applied to investigate the root cause of failure. It was determined that treatment pressure analysis was effective in diagnosing casing and associated fracture plug integrity-loss events. This was achieved by (1) identifying treating pressure trends and anomalies during the main part of the treatment that signify confinement loss, (2) calculating near-wellbore friction at the end of treatments to compare to the friction expected for a confined treatment, and (3) analyzing step-down tests conducted during the pad stage and overflush stage at the end of the treatment to determine the near-wellbore frictional components of perforation friction and near-wellbore tortuosity. This information enabled comparison of previous with current treatments for determining the effects of job design and fracture plug modifications on treatment confinement.
The primary objective of this presentation is to describe the process of assessing treatment confinement using only stand-alone pressure-based analysis. This is achieved by comparing the analysis results with fiber-optic and post-treatment wellbore imaging measurements. Also highlighted is the use of downhole gauges for accurately calculating pipe friction, which is necessary for accurately calculating bottomhole treating pressure at the active treatment interval.
PRESENTER: Dave Cramer, Senior Engineering - ConocoPhillips Global Completions Engineering
Location: Zoom Webinar
Date/Time Information: Tuesday, January 25, 2022 (from 10h00 to 11h00 MST)
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