Production Data Analyzer

The Production Data Analyzer is a free, browser-based visualization tool designed for petroleum engineers, production engineers, reservoir engineers, and asset managers. It takes raw production data in CSV format and instantly generates four key diagnostic charts: production rate versus time, cumulative production, water cut trends, and gas-oil ratio evolution.

Unlike traditional software that requires expensive licenses and lengthy installations, this tool runs entirely in your web browser. Your production data is parsed and visualized using client-side JavaScript, meaning no data is uploaded to any server. This makes it safe for confidential operator data, and ensures instant results with no waiting for server responses.

The tool automatically detects common column formats from popular data sources including OFM exports, Enverus downloads, and state regulatory commission files. It handles multi-well datasets by grouping and color-coding individual wells, allowing you to compare production performance across your asset portfolio at a glance.

Key features include logarithmic and linear scale toggles for rate and GOR charts, automatic calculation of derived metrics such as water cut and gas-oil ratio, one-click PNG export of any chart, and support for data pasted directly from Excel. The analyzer processes files up to 5 MB and can display up to 20 wells simultaneously.

Whether you are reviewing monthly production reports, preparing for a well review meeting, or conducting initial asset screening, the Production Data Analyzer provides the visualization foundation you need in seconds. For deeper analysis including decline curve fitting, EUR forecasting, and economic evaluation, explore our companion tools.

What the Four Key Plots Tell You

Each of the four standard production plots reveals different information about well and reservoir behavior. Understanding what to look for in each chart is fundamental to effective surveillance and decision-making.

• Rate vs. Time: This is the primary decline behavior plot. It shows how oil, gas, and water production rates change over the life of the well. A smooth, predictable decline suggests stable reservoir conditions. Sudden drops may indicate mechanical issues (pump failure, tubing leak), while sudden increases could mean a restimulation or offset frac hit. Plot this on a semi-log scale (log rate vs. linear time) to quickly identify exponential decline as a straight line.
• Cumulative Production: This plot tracks total production over time and shows your progress toward EUR. The slope of the cumulative curve equals the instantaneous production rate — when the curve flattens, the well is producing less. Cumulative plots are especially useful for comparing wells that started at different times or had different production histories.
• Water Cut (Water / Total Liquid): Rising water cut indicates water breakthrough from an aquifer, water injection, or coning. In waterflood operations, the water cut trend helps determine sweep efficiency and predict when a well reaches its economic water cut limit (typically 95–98%). A sudden jump in water cut may signal casing or tubing failure rather than reservoir behavior.
• Gas-Oil Ratio (GOR): GOR reveals the reservoir drive mechanism and fluid behavior. A stable GOR below the bubble point suggests solution-gas drive with the reservoir still above saturation pressure. Rising GOR indicates the reservoir has dropped below bubble point and free gas is forming, or that gas coning is occurring. Falling GOR can indicate pressure support from water injection or aquifer influx.

Common Data Quality Issues

Production data is rarely clean. Here are the most common issues to watch for:

• Shut-ins vs. zero production: A month with zero production could mean the well was shut in (planned or unplanned) or that data was not reported. Treating shut-in periods as production data will distort decline analysis. Always check for corresponding injection or operational data to distinguish the two.
• Commingled reporting: Some operators report production from multiple wells on a single lease or battery, making individual well analysis impossible without allocation. If your data shows unusually stable or smooth production, it may be an allocated or prorated value rather than actual measurement.
• Partial months: Wells that come online mid-month or are shut in for part of a month will show artificially low production. Always normalize partial-month data to a full 30-day equivalent before performing decline analysis.

Why Browser-Based Analysis Matters

Traditional production analysis tools require expensive software licenses and IT-managed installations. Browser-based analysis eliminates these barriers entirely. Because this tool processes data client-side using JavaScript, your production data never leaves your computer — making it safe for confidential operator data. There is nothing to install, no license to manage, and results appear instantly. This makes it ideal for quick screening, field office use, and situations where you need answers fast without waiting for IT approval.