What’s New: HFTC, the Parent/Child Industry Study, HFTS2, Supercritical Geothermal, DFIT, and Automated History Matching
This post reviews some of the more interesting things happening at ResFrac right now: HFTC paper with Apache on Calibrating models with offset fiber, parent/child well industry study, HFTS2 project, engineering geothermal systems, DFIT’s and automated history matching.
The ResFrac mission is to accelerate the process of continuous improvement. We simulate the entire well lifecycle in a single integrated simulation, help operators to synthesize information, make changes, and continue to improve.
Theoretical and Empirical Problems with the Holistic Permeability Correlation for DFIT Interpretation
In this post, I focus on a particular correlation that is sometimes used in the industry to estimate permeability from a shale DFIT: the ‘holistic permeability correlation.’ I show that this correlation can greatly overestimate permeability. When applied to optimize frac design, well spacing, and cluster spacing, overestimated permeability leads to significant loss of economic value.
DFIT interpretation has been a theme of the work that we’ve done within ResFrac. Our collaborative 2018 Industry Study, which culminated in one of the ‘Best of URTeC’ papers in […]
“Postclosure” interpretation is used to infer formation permeability from DFIT pressure measurements. As reviewed in previous posts, the goal of a DFIT is to infer formation properties, of which permeability […]
G-function plots are routinely used to interpret diagnostic fracture injection test (DFIT) transients. Ideally, a plot of pressure versus G and G*dP/dG versus G should form a straight line. However, the G*dP/dG curve is very often curving. A typical DFIT transient is shown below.
Diagnostic fracture injection tests (DFITs) are commonly interpreted by plotting pressure versus a function of time called the G-function. The G-function seems rather arcane and is often misunderstood. However, it has […]