High Resolution Acoustic Imaging of Plug Related Casing Damage in Hydraulically Fractured Horizontal Wells

An advanced high-resolution acoustic imaging technology was deployed for well integrity and deformation assessments in both vertical and horizontal wells. This high frequency acoustic tool collected three-dimensional data quantifying deformation and wall thickness with resolution unobtainable by existing multi-finger caliper, magnetic flux leakage, and rotating single element ultrasonic systems. Several novel imaging methods are enabled by the high number of transducers (up to 512) on the imaging probe. These methods, including beam forming, beam steering and semi-stochastic multipulse imaging, are outlined and discussed in this paper. In addition, multiple types of standardized visualizations enabled by this high-resolution 3D data capture tool are introduced and examples of each are shown. Lab qualification and imagery generated by the high-resolution solid-state imaging technology, when applied to various precision machined geometric anomalies, are presented. In addition to lab validation results, several field studies are showcased including assessments of ovalized casing, complex downhole corrosion, and isolated minor pitting. Leak paths, splits, and damaged regions within threaded casing collars were also identified, imaged, and quantified using the acoustic technology. Until now, these collar regions have been very difficult to image using legacy downhole tools due to fundamental limitations at the threaded connection geometry. Lastly, various downhole completion equipment case studies are presented showcasing several applications of acoustic imaging used to validate the set-position or condition of specialty downhole equipment. This paper outlines the usage of the solid-state acoustic technology to generate three dimensional geometry and wall thickness datasets with sub-millimetric resolution, providing operators with a holistic and actionable assessment of their well integrity.

show abstract

Integration of Sealed Wellbore Pressure Monitoring Responses with Wellbore Strain and Deformation Measurements for Fracture Diagnostics

Elliott

Zheng

Russel

et al. 2022

Day 3 Thu, February 03, 2022

View full text Add to dashboard Cite

The objective of this work is to investigate, develop, and demonstrate the direct link between wellbore casing strain / deformation measurements, and sealed well pressure responses. The paper presents new laboratory experiments for casing deformation that tie directly to wellbore deformation during hydraulic fracturing and to subsequent pressure increases caused by intersections of fractures with horizontal wellbores. We show that wellbore strain measurements can be combined with surface wellbore pressure measurements to diagnose fracture intersection and estimate geometry and growth rates. A casing strain experiment was set up to measure wellbore deformation caused by loads that are encountered during fracture intersection. Multiple strain gauges were installed on a joint of 5.5" P110 casing radially and longitudinally, as well as azimuthally around the pipe. A load frame was utilized to stress the casing at various points along the pipe to develop relationships between load, strain, and deformation. Analytical models were deployed to compute the expected casing strain for thick-wall pipes and were compared to our laboratory measurements. Numerical modeling was performed to simulate the casing strain response and the induced pressure change at the surface as hydraulic fractures approach and intersect the wellbore. The results of the laboratory measurements of azimuthal casing strain agree well with fully coupled 3D numerical modeling. Sealed wellbore pressure responses calculated from the magnitude of these deformations agree well with the actual field responses. This work now allows us to relate the sealed well response to a quantifiable fracture geometry and region of deformation along the casing. Strain profiles from deformation are developed and allow a direct coupling of volume change in the wellbore due to fracture arrivals. We display the various fracture properties required to generate the observed field responses (0.1-10 psi order of magnitude). Additionally, Sealed Wellbore Pressure Monitoring (SWPM) field data is reported, interpreted and explained with the help of our experimental data and numerical simulations. This work deploys first of its kind measurements to enhance the interpretation of a sealed well pressure response during fracturing. The additional knowledge of wellbore strain and deformation together with surface pressure responses is a major leap forward in further understanding the full utility of downhole strain and casing ovality responses as a diagnostic. This work sets the stage for using physical wellbore deformation as a key, low-cost fracture diagnostic method and opens up a new category of diagnostic technologies for the industry based on integrating surface pressure and downhole strain measurements.

show abstract

High Resolution Acoustic Imaging of Plug Related Casing Damage in Hydraulically Fractured Horizontal Wells

Cited by 13 publications

References 7 publications

Research on Wellbore Axis Alignment Calibration Method for Casing Deformation Ultrasonic Three-Dimensional Imaging Technology

Research on Wellbore Axis Alignment Calibration Method for Casing Deformation Ultrasonic Three-Dimensional Imaging Technology

High Resolution Solid State Acoustic Imaging for Advanced Well Integrity and Deformation Assessments in Conventional and Unconventional Wells

Integration of Sealed Wellbore Pressure Monitoring Responses with Wellbore Strain and Deformation Measurements for Fracture Diagnostics

Contact Info

Product

Resources

About