Default Emission Factors: When Subpart W Still Allows Them
Default emission factors are Subpart W's Calculation Method 4 for natural gas pneumatic devices, and cannot be used for devices measured under Methods 1 to 3.
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The TetraSoft Blog
Regulatory updates, emissions data, and methane science.
Colorado Regulation 7: What It Requires and What It Costs
Colorado Regulation 7 no longer has a Part D. What Part B requires, which sections are statewide, and how the intensity verification factor is set.
Division Order: What It Is and How to Check the Decimal
A division order states your decimal interest in a well's revenue. The decimal is net mineral acres over unit acres times royalty rate, and it is checkable.
Texas Oil Fields: 65,000 Names and Two Drilling Eras
Texas files 65,038 field designations that roll up to 23,923 fields. Most contain no horizontal well at all, and a few hundred hold the shale inventory.
What Is Subpart W Suspension? State Rules Still Apply
Federal methane reporting faces suspension while Colorado ONGAEIR and New Mexico mandates stay fully enforceable. How multi-state O&G operators should respond.
Inflation Reduction Act: What Is Left for Methane in 2026
The IRA methane charge was not repealed. Its rule was disapproved and the charge moved to 2034. What still binds oil and gas operators, provision by provision.
Greenhouse Gases and CO2e: One Tonne, Three Answers
Which greenhouse gases oil and gas emits, and why the same tonne of methane becomes three different CO2e numbers depending on which published basis you use.
Natural Gas Liquids: What NGLs Are and How GPM Is Measured
Natural gas liquids are ethane, propane, the butanes, the pentanes and a heavier tail in natural gas. How GPM is measured, and how NGLs differ from LNG.
Oil and Gas Methane Carbon Credits: What Sets the Volume
Oil and gas carbon credits come from plugging wells and repairing leaks. The baseline leak rate, the crediting period and the GWP basis set the volume.
OOOOb Compliance Software: What to Track and How to Choose
OOOOb sets six survey frequencies and two repair clocks by site type, and the rule is under reconsideration. Here is what to track and how to evaluate tools.
Well Log Lookup: Find Logs for Any US Oil or Gas Well
Well logs are public records, but each state keeps its own. Where the log repositories live, why the API number is the key, and how to run the lookup.
Continuous Emission Monitoring Systems: When CEMS Apply
A CEMS is a certification regime, not a sensor. Which oil and gas equipment needs one, what changed for turbines in 2026, and the quarterly cost.
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