MULTIDISCIPLINARYINTEGRATION WITH

GOHFER®

PETROPHYSICS

GEOMECHANICS

SEISMIC GEOPHYSICS

TREATMENT DIAGNOSTICS

RESERVOIR ENGINEERING

COMPLETIONS

ECONOMICS

DRILLING

TREATMENT SURVEY

• Import deviated and horizontal well surveys• Easily overlay and display on top of TVD grid with perforation locations• Fully 3D wellbore directional survey• Wellbore breakdown pressure and orientation calculations along the entire wellbore

TREATMENT LAS

• Direct importing of digital log or core data to build grid and stress profile• Built-in correlations for synthetic mechanical rock properties and gas identification• Ability to generate unique relationships and correlations• Shale log processing• Auto log assistant features

GOHFER®, which stands for Grid Oriented Hydraulic Fracture

Extension Replicator, is a fully 3-D geometry fracture simulator

with a fully coupled fluid/solid transport simulator. The formulation

of GOHFER is based on extensive laboratory and field experiments

and observations, and is continuously updated as new knowledge

and information becomes available. GOHFER is the most

powerful, comprehensive tool available in the petroleum

industry for the design, analysis & optimization of hydraulic

fracture and acid fracture stimulation treatments.

DIAGNOSTICS

• Step Rate Analysis for pipe and near-wellbore friction, number of effective perforations open and frac extension pressure• DFIT analysis including determination of closure pressure, net extension pressure, efficiency, the presence and stress state of natural fractures, the dominant leakoff magnitude and mechanism and reservoir flow capacity• Permeability estimate from G Function

GRID

• Allows for vertical and lateral variations in grid properties• Multiple perforated intervals as well as single and bi-wing asymmetric fractures • Allows complex 3D geologic structure in longitudinal and transverse direction to simulate fracture growth in complex folded and faulted regions• Fluid composition, proppant concentration, shear, leakoff, width, pressure, viscosity and other state variables defined at each grid block.• Adjustable vertical to horizontal anisotropy

PRODUCTION

• Handles cleanup, multiphase non-Darcy flow, and stress (proppant crushing) effects based on more than 30 years of Stim-Lab Inc. research• Correctly handles production interference of multiple transverse fractures on horizontal wells and allows for the optimization of fracture spacing in unconventional reservoir development• Outputs stimulation efficiency details including all accountable damage components, remaining effective frac conductivity, FCD, infinite- conductivity effective length, and NPV of design

FLUID DATABASE

• Robust set of fluids from major service companies including brines, acid, foam, crosslinked and linear fluid rheologies• Ability to match laboratory rheology data to build unique user database

PROPPANT DATABASE

• Stim-Lab Inc. unique proppant database of more than 200 materials that have been studied extensively under actual field conditions of stress, time, and temperature• New proppants continually added

TRANSVERSE FRACTURES

• Variable inter/intra-stage fracture stress shadow interference factor calculated as a function of distance between the fractures • Multi-stage/multi-cluster modeling capability for plug & perf or ball drop simulations• Models crossflow during pumping and after shut-in, up to closure• Fully rotating 3D view of all output variables updated live during model run• Fracture orientation determined by stress azimuth, independent of well direction

REAL TIME

• Direct importation of streaming or internet real time data• Real time diagnostic analysis and calculated bottom hole pressure

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

©2015 Barree & Associates LLC. GOHFER® is a registered trademark of Barree & Associates.

WWW.GOHFER.COM

Maximum stress shadowing interference shownbelow, showing virtual termination of interior fracs

GOHFER DISTINGUISHING CHARACTERISTICS

• Shear/Slip decoupled fracture geometry

• Vertical and horizontal anisotropy in propagation and

transport solutions

• Temporally and spatially variable leakoff

• Non-uniform solid and liquid velocities and fluid transmissibility

in the fracture

• Iteratively coupled fluid pressure/proppant concentration

distribution in the fracture

• Internally calculated geologically consistent in-situ stress

• Handles impact of secondary fracture systems on fluid

leakoff/proppant transport

• Carreau fluid rheology model

Fully 3D wellbore directional survey with variable grid properties and geologic structure.

Calculated Wellbore BreakdownPressure & Orientation

GOHFER ADVANTAGES

• Multi-stage Horizontal Well Modeling – simultaneous longitudinal

and transverse fracs

• Production analysis – rate transient type-curve analysis, decline

curve analysis and production forecasting

• Variable inter/intra-stage fracture stress shadow interference factor

• Comprehensive log analysis package

• Limited entry design

• Complete pressure diagnostic analysis package

• Unique fracture conductivity and post-frac production model

• Accurately models fracturing results as verified by tracer logs

and micro-seismic surveys

• Fracture acidizing and acid conductivity model

• Most effective tool for modeling fracture treatments in

unconventional pay such as tight gas shales and coal

Rate transient type-curve analysis showing fraction of horizontal lateral producing.

Characterize complex 3D geologic grid structure in longitudinal and transverse direction.