pnge-geochem-pw

Compare produced water chemistry across formations or basins with QA/QC validation. Trigger: /water-chem-compare Marcellus vs Smackover

Analytical chemistry and sampling plan designer for produced water characterization. Recommends sampling protocols, preservation methods, ICP-OES/ICP-MS/IC analytical methods, detection limits, QA/QC plans including blanks, duplicates, and spike recovery targets, and flags high-TDS matrix interference risks. Use when the user asks how to sample produced water, what analytical methods to use for brine Li/Mg analysis, how to preserve produced water samples, what detection limits are needed, how to design a QA/QC plan for water chemistry, what interferences to expect from high-TDS matrices, or how to plan a field sampling campaign. Trigger phrases include sampling plan for produced water, analytical methods for brine, ICP-OES vs ICP-MS for lithium, sample preservation protocol, QA/QC plan water chemistry, high-TDS matrix interference, detection limits for produced water, or field sampling design for brine characterization.

Produced water treatment engineering agent that evaluates treatment options for reuse, disposal, and critical mineral recovery from oilfield brines. Orchestrates produced water chemistry data, environmental compliance data, water stress context, and engineering calculations to provide treatment pathway assessments. Use when the user asks about treating produced water for beneficial reuse, evaluating treatment options for a specific brine composition, assessing DLE applicability, or needs an engineering assessment of produced water management options. Trigger phrases include produced water treatment options, brine treatment for reuse, DLE feasibility assessment, produced water chemistry treatment design, Class II injection vs. reuse economics, zero liquid discharge for produced water, desalination of oilfield brine, scaling and fouling prediction, treatment train design, or NEWTS produced water data.

Water chemistry QA/QC specialist agent for produced water and brine geochemical data. Harmonizes units, flags censored and below-detection values, calculates charge balance errors, identifies duplicate samples, normalizes formation names across datasets, and validates ionic balance. Use when the user asks to clean or validate produced water chemistry data, check charge balance, harmonize units between datasets, flag data quality issues in brine analyses, normalize formation names, identify outliers or duplicates, or convert ppm to mg/L with specific gravity correction. Trigger phrases include QA/QC water chemistry, charge balance check, ionic balance error, unit harmonization ppm mg/L, data quality screening, formation name normalization, censored data handling, or duplicate sample detection.

Perform material balance, energy balance, and reaction stoichiometry calculations for chemical and petroleum engineering courses. Covers steady-state and transient material balances on single and multiple components, energy balances with heat of reaction, heating and cooling, phase equilibria basics, combustion calculations for natural gas, separator design balances, flash calculations, and reaction extent for refinery and gas processing applications. Use this skill when the user needs to solve mass balance problems, energy balance problems, stoichiometry, combustion air calculations, separator flash calculations, heat duty estimation, or reaction engineering calculations for ChBE 211, ChBE 321, or petroleum processing coursework. Trigger for phrases like "material balance on separator", "energy balance for heater treater", "combustion air for natural gas", "flash calculation", "reaction stoichiometry", "heat of combustion methane", "steady state mass balance", "recycle stream balance", "excess air calculation", or "heat duty for reboiler". Produces step-by-step solutions with labeled equations and Python code.

Query NIST WebBook for thermodynamic and transport properties of pure fluids including natural gas components, CO2, water, and hydrocarbon solvents. Provides vapor pressure, density, viscosity, thermal conductivity, heat capacity, enthalpy, entropy, and phase equilibrium data. Use this skill when the user asks about thermodynamic properties of a fluid, vapor pressure at a given temperature, density of methane at reservoir conditions, viscosity of CO2 for injection design, heat capacity of natural gas components, steam tables, equation of state properties, or any physical property of a pure substance. Trigger for phrases like "viscosity of methane at 200F and 3000 psi", "density of CO2 at reservoir conditions", "vapor pressure of water at 150C", "heat capacity of ethane", "enthalpy of methane at wellhead conditions", "steam table properties", "natural gas component properties", "thermodynamic properties of propane", or any pure fluid property query. Returns tabulated saturation or single-phase properties with units.

Run PHREEQC (USGS geochemical modeling code) to compute aqueous speciation, mineral saturation indices, and scaling/precipitation predictions for produced waters and oilfield brines. Use this skill whenever the user asks about brine chemistry modeling, scaling prediction (barite, calcite, gypsum, celestite, halite, anhydrite), saturation index (SI), aqueous speciation, activity coefficients, ion interference in direct lithium extraction (DLE), produced water treatability, or any question needing thermodynamic equilibrium calculations. Trigger phrases: PHREEQC, speciation, saturation index, SI, scaling prediction, scaling tendency, barite scaling, calcite scaling, gypsum scaling, brine chemistry, aqueous geochemistry, Pitzer model, activity coefficient, high-TDS brine, will this brine scale, DLE interference, equilibrium speciation, mineral solubility, sulfate scaling, carbonate scaling. Selects the right thermodynamic database for the ionic strength, builds the input deck, runs PHREEQC, and interprets the SI table.

Emulate tNavigator reservoir simulation workflows for PNGE students. Use this skill when asked to build .DATA files, run material balance, calculate PVT properties, do decline curve analysis, history matching, nodal analysis, VFP tables, IPR curves, kriging, petrophysics, or anything involving reservoir simulation, black oil models, compositional models, Arps decline, Vogel IPR, Beggs-Brill, Peng-Robinson EOS, Z-factor, bubble point, formation volume factor, water saturation, Archie equation, or sensitivity studies on reservoir parameters. Trigger phrases: "reservoir simulation", "build a DATA file", "PVT calc", "decline curve", "material balance", "history match", "nodal analysis", "IPR curve", "VFP table", "Z-factor", "bubble point", "Bo calc", "kriging", "Archie", "skin factor sensitivity", "recovery factor". Educational tool — not a replacement for full tNavigator or Eclipse runs.