Upstream Oil & Gas Consulting
A&A's Complete Upstream Consulting Practice — Subsurface Characterization, Reservoir Performance Forecasting, Field Development Planning, Well Engineering, Production Optimization, and Heavy Oil Resource Development — Worldwide
Assign your company's most challenging upstream oil & gas projects — from subsurface characterization and reservoir performance forecasting, through field development planning, well engineering, and production optimization, to mature-field revitalization and specialized heavy-oil development — to A&A, and let the high-level, seasoned consultants of the A&A Consulting Team bring the full depth of A&A's upstream practice to bear on your project, of any reservoir type, onshore or offshore, anywhere around the world.
Avasthi & Associates, Inc. (A&A) is an independent petroleum engineering and geoscience consulting firm. A&A does not sell reservoir-simulation, geosciences, or nodal-analysis software, drilling or completion equipment, artificial-lift systems, or field hardware of any kind — our only business is expert technical consulting, which means A&A's upstream recommendations are never influenced by a stake in any particular vendor or technology.
A&A's Upstream Oil & Gas Consulting practice has supported clients on oil & gas field projects since 1970 — across every stage of an asset's life, from acreage acquisition, exploration, and appraisal, through development, production, and mature-field management. Rather than isolated single-discipline studies, A&A's high-level, seasoned consultants assemble multi-disciplinary project teams — geoscientists, reservoir and production engineers, well engineers, facilities engineers, and economists — matched to what a given project actually needs, whether that is a single focused study or full-lifecycle support.
A&A's Upstream Oil & Gas Consulting Services
A&A's upstream practice is organized into nineteen consulting services, grouped below into five logical categories that broadly follow the sequence of a typical field's technical lifecycle — each service has its own dedicated page describing A&A's methodology, project experience, and deliverables in depth:
Subsurface Characterization & Static Modeling
1. Geosciences Consulting
Integrated geophysical/seismic, petrophysical, geological, geostatistical, and geochemical analysis — using industry-standard software such as Petrel, Interactive Petrophysics (IP), PowerLog, SMT, ECLIPSE, Landmark, and OFM — to build the 3-D static reservoir models that dynamic simulation, reserves estimation, and development decisions depend on.
2. Geomodeling/Static Modeling Consulting
Integrating geological, petrophysical, and geophysical/seismic-interpretation data into a single, internally consistent 3-D static (geocellular) model of reservoir structure, stratigraphy, facies, and rock/fluid properties — the geological foundation that dynamic reservoir-simulation models are upscaled from, and that original oil- and gas-in-place volumes and probabilistic reserves estimates are calculated from directly.
3. Reservoir Characterization Consulting
Integrated, multi-disciplinary reservoir characterization and dynamic reservoir-simulation studies — determining reservoir architecture and oil & gas in-place, and predicting future reservoir performance under alternative operating scenarios — to identify the optimum technical and economic reservoir-exploitation plan.
4. Geomechanics Consulting
Geomechanics and fracturing consulting — including planning, coordination, and independent technical oversight of fracturing operations, wellbore-stability and in-situ stress-field analysis, and drilling/completion program design in geologically complex or hostile environments — to lower drilling and completion cost and raise recovery across the life of the asset.
Reservoir Performance Forecasting, Due Diligence & Field Development Planning
5. Probabilistic Approach to Reservoir Performance Predictions
Top-Down Modeling (TDM) and Experimental Design/Design of Experiments (DoE) — the two leading methods for generating fast, fully probabilistic reservoir performance forecasts that integrate subsurface geological uncertainty with operational and economic uncertainty — with A&A recommending whichever method actually fits a project's data and deadline.
6. Full Field Review (FFR) of Oil & Gas Fields
Independent technical due diligence — covering reservoir and subsurface, facilities, and operations — for companies considering a major investment in an oil & gas field, giving management, partners, and lenders the independent review a major capital decision requires.
7. Oil & Gas Field Development Planning (FDP) and Field Development Modeling (FDM)
Probabilistic, PetroVR-based field development plans and models — from notional concept through ready-to-sanction — for onshore and offshore conventional oil & gas fields, integrating subsurface, well, facility, and economic uncertainty into a single, auditable decision-support model.
8. Decision-Grade Reservoir Simulation-Driven Field Development Planning (FDP) Studies
A rigorous, four-phase decision-grade FDP framework — static subsurface characterization, integrated asset modeling, next-generation parallel/cloud reservoir simulation and AI-based reservoir proxies, and P10/P50/P90 probabilistic analysis — built to mitigate capital risk and support development CAPEX approval by management, equity partners, and lenders.
9. Field Development Planning (FDP) and Field Development Modeling (FDM) of Unconventional/Shale Resources
Resource assessment, evaluation, and notional field development planning for unconventional/shale plays, fields, acreage, or lease portfolios — consolidating geological data, reservoir-parameter mapping, resource-potential estimation, and production-performance analysis into a reserves-and-economic-value report and field development model.
Related A&A Service: For A&A's full suite of dedicated shale/unconventional consulting services — assessment, geological and static modeling, geophysical/seismic inversion, dynamic modeling, fracturing, and horizontal drilling and completion — please see A&A's Shale/Unconventional Resources Development (URD) Consulting page.
Well Engineering, Integrity & Integrated Production-System Modeling
10. Well Engineering, Drilling and Completion Consulting
Senior-level well engineering and project advisory support — well architecture selection, drilling program development, casing/cementing/completion design, and well rehabilitation and reactivation — for complex drilling, completion, CCS/CCUS, CO₂-EOR, and geothermal developments, onshore and offshore, including large-scale legacy well-stock rehabilitation and rejuvenation in Venezuela.
11. Well Integrity Consulting Services
Life-cycle well-integrity due diligence — from drilling through plugging and abandonment — for conventional, CO₂-EOR, and CO₂-storage wells, confirming which existing wells meet applicable fluid-injection or production standards, which require workover, and what a defensible new-well drilling and completion program should look like.
12. Integrated Asset Modeling (IAM)
A single, realistic integrated production-system model — reservoir, well inflow, wellbore, pipeline, and compressor — replacing isolated facilities, well, and reservoir studies, using MBAL, GAP, PROSPER, RESOLVE, IMEX, GEM, ECLIPSE, PIPESIM, PIPER, tNavigator, and HYSYS, among other industry-standard software.
13. Nodal Analysis and PROSPER Modeling
Specialized nodal analysis of CO₂ injection wells and high-CO₂-content production wells — accounting for CO₂ phase behavior, Joule-Thomson temperature effects, and electrical-submersible-pump (ESP) performance under high-CO₂ conditions — for CCS/CCUS and CO₂-EOR projects, using PROSPER, tNavigator, and HYSYS.
Related A&A Service: For A&A's full suite of dedicated CCS/CCUS consulting services — CO₂-EOR and dedicated geologic storage, well-integrity and regulatory support (Class II vs. Class VI), and monitoring, reporting, and verification (MRV) — please see A&A's CCS/CCUS Consulting page.
14. Produced Water Management Consulting
Produced water characterization, Class II UIC disposal-well design and permitting, and induced-seismicity risk assessment and mitigation — applying the same subsurface-characterization and injection-well engineering disciplines A&A uses on CO₂ storage, CO₂-EOR, and waterflooding projects to the industry's largest-volume waste stream, plus beneficial-reuse strategy support as regulatory pathways for off-lease reuse develop state by state.
Related A&A Service: Produced water and brine management expertise also extends directly to A&A's Lithium (DLE) and Geothermal practices — for brine characterization and injection-well design supporting Direct Lithium Extraction, please see A&A's Lithium (DLE) Consulting page.
Related A&A Service: For the same expertise applied to geothermal brine and injection wells, please see A&A's Geothermal Energy Resources Assessment & Development Consulting page.
Reservoir Performance Diagnostics, Production Optimization & Mature-Field Revitalization
15. Reservoir Performance & Production Optimization Consulting
Reservoir surveillance and performance diagnostics — decline-curve, material-balance, pressure-transient, and injection-conformance analysis — that identify why a field is underperforming and translate the findings into a ranked, economically justified inventory of production-optimization, waterflood, EOR/IOR, and redevelopment opportunities.
16. Production Optimization
Field-wide production-enhancement strategies — fracturing and acidizing, sand control, coiled tubing, hydraulic workover, artificial lift, and pipeline/process changes — supported by flexible, look-ahead production models that incorporate both reservoir decline and future facilities investment across the life of the asset.
17. Revitalizing Mature Oilfields
Extracting the last economic barrel from mature and marginal fields through bypassed-pay identification (pulsed neutron/carbon-oxygen logging), fluid-recovery maximization (gas lift, electrical submersible pumps), and waterflood redesign — A&A's three-pronged approach to extending a field's productive life.
Heavy Oil Resource Specialization
18. Heavy Oil Resources Evaluation, Development and Optimization
Cyclic Steam Stimulation (CSS), steamflooding, and SAGD (steam-assisted gravity drainage) screening for heavy and extra-heavy oil resources — decades of thermal EOR experience applied to the rejuvenation, redevelopment, and brownfield reactivation of mature heavy-oil assets, including Venezuela's Faja del Orinoco (Orinoco Belt) and Lake Maracaibo/Bolivar Coastal Fields.
19. Shallow, Unconsolidated Sandstone Heavy Oil Reservoirs
Reservoir evaluation, sand management, and thermal/polymer EOR for the world's shallow (roughly 40 to 1,200 meters), unconsolidated sandstone heavy-oil reservoirs — where sand production, wellbore stability, and completion design are as central to development as the recovery method itself.
Related A&A Service: For A&A's full suite of dedicated EOR/IOR consulting services — including waterflood optimization, CO₂/hydrocarbon-gas/nitrogen/chemical/steam EOR, history-matching, pilot testing, and project operations — please see A&A's EOR/IOR Consulting page.
How A&A's Upstream Services Fit Together
The five categories above broadly follow the technical sequence of a typical upstream project, though A&A clients engage A&A at whichever point their project actually needs support:
• Subsurface characterization: geosciences, static/geomodeling, reservoir characterization, and geomechanics studies build the geological, petrophysical, and geomechanical foundation everything downstream depends on
• Reservoir performance forecasting and field development planning: probabilistic prediction, independent Full Field Review due diligence, and conventional or unconventional FDP/FDM studies turn that foundation into a defensible investment and development decision
• Well engineering, integrity, and integrated production-system modeling: well engineering, well-integrity due diligence, Integrated Asset Modeling, and CO₂-specific nodal analysis design and validate the wells and production system the FDP calls for
• Reservoir performance diagnostics, production optimization, and mature-field revitalization: diagnose why a producing asset is underperforming, then keep it performing at its potential and extend the productive life of mature and marginal fields
• Heavy oil resource specialization: applies dedicated thermal, polymer, and sand-management expertise to heavy and extra-heavy oil assets, wherever they fall in that sequence
A&A's Upstream Track Record
A&A's upstream consultants bring more than fifty years of combined, hands-on experience — dating back to 1970 — across the full technical lifecycle of oil & gas assets: geosciences and static modeling; probabilistic reservoir performance prediction; Full Field Review due diligence; conventional, decision-grade, and unconventional/shale field development planning; well engineering and well-integrity due diligence; integrated asset and nodal-analysis modeling; reservoir performance diagnostics and production optimization; mature-field revitalization; and specialized heavy-oil resource development. A&A's project experience spans the Permian Basin, the Gulf Coast, the Rocky Mountain region, and the Williston Basin in the United States, and internationally in Canada, Argentina, Indonesia, Vietnam, Vaca Muerta (Argentina), and Venezuela — including large-scale heavy-oil and legacy well-stock work in the Faja del Orinoco and Lake Maracaibo/Bolivar Coastal Fields. This breadth means A&A's recommendations are grounded in direct project experience across alternatives, not just the option being proposed.
What A&A Delivers
An Upstream Oil & Gas Consulting engagement with the A&A Consulting Team is built around the practical decisions your company needs to make, including, but not limited to:
• A clear technical and economic picture of your subsurface — static models, in-place volumes, and reservoir characterization your development and investment decisions can stand on
• A probabilistic, defensible reservoir performance forecast, and a field development plan or model built to the level of rigor your decision requires — notional, ready-to-sanction, or decision-grade
• Independent, vendor-neutral technical due diligence for field acquisitions, redevelopment programs, or major capital commitments
• Well engineering, well-integrity, and integrated production-system designs your drilling, completion, and operations teams can execute
• Production-optimization and mature-field revitalization strategies that extend the economic life of assets already on production
• Specialized thermal, polymer, and sand-management expertise for heavy and extra-heavy oil resources, including complex legacy assets
Frequently Asked Questions
Which A&A upstream service is the right starting point for our project?
It depends on where your project stands today. A new or unfamiliar asset typically starts with subsurface characterization (geosciences, static modeling) or an independent Full Field Review; a field already characterized typically moves to reservoir performance forecasting and field development planning; a field already in development or production typically starts with Reservoir Performance & Production Optimization Consulting's diagnostic screening, then moves into well engineering, production optimization, or mature-field revitalization, as the diagnosis warrants. A&A's consultants can help identify the right entry point for your specific project.
Can A&A support just one phase of our upstream project, or the whole lifecycle?
Both. Many A&A clients engage A&A across the full lifecycle — from subsurface characterization through field development planning, well engineering, and ongoing production optimization — while others engage A&A for a single phase, such as a Full Field Review, a static model, or a well-integrity due-diligence study. A&A's nineteen upstream services are designed to work together, but each stands on its own.
How do these Upstream Oil & Gas Consulting services relate to A&A's EOR/IOR, Shale/Unconventional Resources Development (URD), and CCS/CCUS consulting practices?
A&A organizes its EOR/IOR, Shale/Unconventional, and CCS/CCUS practices as their own dedicated consulting hubs, since each involves recovery methods, technical workflows, or regulatory frameworks distinct enough to warrant a full suite of specialized services. This Upstream Oil & Gas Consulting practice covers the subsurface characterization, reservoir performance forecasting, field development planning, well engineering, and production-optimization services that apply across conventional, unconventional, EOR/IOR, and CCS/CCUS projects alike — and cross-links to the EOR/IOR, Shale/Unconventional (URD), and CCS/CCUS hub pages wherever a project needs that specialized depth.
Does A&A have specialized experience with heavy oil and extra-heavy oil resources, including in Venezuela?
Yes. A&A's Heavy Oil Resources Evaluation, Development and Optimization and Shallow, Unconsolidated Sandstone Heavy Oil Reservoirs services bring decades of Cyclic Steam Stimulation (CSS), steamflooding, and SAGD experience — including extensive project experience in Venezuela's Faja del Orinoco (Orinoco Belt) and Lake Maracaibo/Bolivar Coastal Fields — as well as sand-management and polymer-EOR expertise applicable to shallow, unconsolidated heavy-oil sands worldwide.
What software does A&A's upstream practice use?
A&A's consultants are expert users of industry-standard upstream software, including Petrel, Interactive Petrophysics (IP), PowerLog, SMT, Landmark, and OFM for geosciences and static modeling; ECLIPSE, IMEX, GEM, and tNavigator for reservoir simulation; PetroVR for field development planning; and MBAL, GAP, PROSPER, RESOLVE, PIPESIM, PIPER, and HYSYS for integrated asset modeling and nodal analysis. A&A's software recommendations are always matched to the project's data and objectives, never to a vendor relationship.
Does A&A sell reservoir-simulation software, equipment, or any other product?
No. A&A is an independent consulting firm and does not sell reservoir-simulation, geosciences, or nodal-analysis software, drilling or completion equipment, artificial-lift systems, or any other upstream product, so A&A's technical recommendations are never influenced by a stake in any particular vendor or technology.
If you need consulting support on your company's challenging upstream oil & gas projects — from subsurface characterization and reservoir performance forecasting, through field development planning, well engineering, and production optimization, to mature-field revitalization and specialized heavy-oil development, around the world — please contact us.
