GOHFER 9 is a multidisciplinary comprehensive geological fracture simulator that includes all necessary tools for conventional and unconventional completion design, analysis, and optimization. GOHFER is the abbreviation of the grid oriented hydraulic fracture extension replicator, which is a planar three-dimensional geometric fracture simulator with a fully coupled fluid/solid transport simulator. The fracturing and acidification simulation software GOHFER adopts a three-dimensional grid structure algorithm to dynamically calculate and simulate the expansion of three-dimensional fractures. The calculation process fully considers the anisotropy of the formation, multiphase flow multi-dimensional flow, proppant transportation, fracturing fluid rheology, and dynamic filtration Acid rock reaction and other related factors can calculate and simulate the asymmetric crack propagation of multiple perforated intervals and other well conditions.
GOHFER is a multi-disciplinary, integrated geomechanical fracture simulator that incorporates all the tools necessary for conventional and unconventional well completion design, analysis and optimization. GOHFER, which stands for Grid Oriented Hydraulic Fracture Extension Replicator, is a planar 3-D geometry fracture simulator with a fully coupled fluid/solid transport simulator. GOHFER has been continually developed and refined by Dr. Robert D. Barree & Barree & Associates LLC for over 40 years. GOHFER and Barree & Associates were acquired by Halliburton in 2018.
Multidisciplinary, 3D fracture simulator and completion optimization tool
Fracture modeling value-delivery requires the right people and the right tools. Halliburton engineers have supported hydraulic fracturing since its inception. As a company we have more fracture data and results than any company in the world. However, that data is only valuable if it can be put to use. This requires the right tools. GOHFER software is the premier hydraulic fracture software package on the market and is the right tool to drive value to the end users.
Petrophysical Analysis – Comprehensive petrophysical analysis package with built-in synthetic correlations for mechanical rock properties and gas identification. QC or replace poor or absent sonic data and ability to incorporate core data.
Fracture Simulation & Production – Finite difference gridded solution assuming shear/slip fracture geometry (not linear elastic). Vertical and horizontal anisotropy, spatially variable leakoff and limited entry design/multiple simultaneous fracture initiation sites. Handles impact of secondary fracture systems on fluid leakoff/proppant transport and geometry. 3D Complex horizontal fracture modeling – longitudinal and transverse components. Variable inter/intra-stage fracture stress shadow interference factor. Multi-stage/multi-cluster modeling capability for plug & perf or ball drop simulations. Fracture orientation determined by stress azimuth, independent of well direction.
GOHFER Production handles cleanup, multiphase non-Darcy flow and stress (proppant crushing) based on 30 years of Stimlab Inc. research. Handles production interference of multiple transverse fractures and allows for optimization of fracture spacing in unconventional reservoir development.
Pressure Diagnostics – Complete pressure diagnostic analysis package including step rate and blowdown analysis; fracture closure analysis and determination and effects of primary leakoff mechanism; after closure analysis for pore pressure and permeability. Also includes a permeability estimation from G function analysis.
Production Analysis – Uses actual production data to analyze post-frac performance and assess stimulation effectiveness. Includes rate transient type-curve analysis, decline curve analysis, production forecasting to ultimate recovery, and flow regime identification. Determines fracture spacing and effective well spacing for horizontal wells, along with the fraction of the lateral producing.
Real-Time – Direct importation of streaming or internet real time data with real time pressure diagnostic analysis, fracture simulation and calculated bottomhole pressure.
GOHFER 3D is leading the industry into the future with the most current research and technology while challenging outdated philosophies and paradigms giving you more confidence and predictability in your completion strategy. GOHFER’s formulation has been used extensively and successfully in all regions globally in all types of reservoirs and does not require a special module for individual environments. GOHFER’s timely technical support and comprehensive software documentation is unparalleled in the industry.
GOHFER 3D can handle multiple wells, including vertical and horizontal in the same model
Full 3D geo-mechanical earth model input or optional input of 2D surface map with digital reference well log data
Variable inter/intra-stage fracture stress shadow interference between each fracture and stage on each well with stress shadow cloud display.
Wellbore breakdown gradient and angle & breakdown pressure and orientation calculations
Geosteering of laterals and engineered completions
Models both the longitudinal and transverse fracture components
Pressure diagnostic analysis, production forecasting and rate transient analysis
DAS/DTS integration, perforation erosion and flow diversion modeling
Production optimization feature to optimize completions on spacing (well spacing/frac spacing) or length (frac length/stage length) to determine maximum economic value.
What makes GOHFER different?
Process Zone Stress (PZS) as fracture extension criterion instead of fracture toughness. PZS is directly measurable and can be calibrated from DFIT
Fully planar three-dimensional transport and deformation, not pseudo-three-dimensional
Shear-decoupled formulation of large-scale rock deformation
Realistic fracture screenout behavior and modeling
Fracture conductivity under actual producing conditions correlated to more than 30 years of laboratory measurements
Laboratory validated proppant transport model
System Requirements
Operating System (Windows 10 recommended)
GOHFER 3D – Windows 10/8/7
Sentinel RMS License Manager
Windows (32-bit and 64-bit) operating system
UNIX-based (32-bit and 64-bit) operating systems, including Linux, Mac, Solaris Sparc, x86, AIX, and HPUX
Linux ARM (32-bit [Hard Float/Soft Float] and 64-bit) operating system.
For a full list of Operating Systems and Virtual Machines supported by Sentinel RMS, please navigate to THALES.
Processor / Memory:
7th generation processor recommended (recommend upgrading if older than a 6th generation processor).
Minimum quad core processor recommended. 6 core processor is considered ideal.
Utilizes multi-threading and will benefit from multiple processors.
Non-geologic model projects 8 GB RAM recommended minimum. Geologic model projects > 16 GB ram recommended.
Video Card:
Minimum 512K memory video card.
Recommend 2GB video memory. Main recommendation is that the card has its own memory rather than sharing main memory.
Engine Priority Options:
In the Run Engine Options beginning in v9.1+, the priority level of the simulation can be set. Recommendations are shown below based on number of cores.
SETTING
PRIORITY
RECOMMENDATION
Background
low priority with ½ the cores
Recommended setting for dual core
Foreground
normal priority with all the cores
Best for most users
Max Performance
high priority with all the cores
Quad core or above recommended
For Additional Performance, consider adding the following:
