Midstream companies: what midstream oil and gas does

What midstream oil and gas means

Midstream is the part of the oil and gas industry that collects raw production, makes it fit for transport, moves it, stores it, and hands it to the next user. It sits between producers and the refineries, chemical plants, utilities, power stations, and export markets that consume their output. The segment is defined less by the commodity than by infrastructure: pipelines, compressor stations, processing plants, fractionators, storage caverns and tanks, and marine terminals.

Most midstream companies do not earn their revenue from where a commodity price goes. They earn it from moving or handling volumes under contracts, tariffs, or service agreements. That distinction is the most important thing to understand about the segment, and the reason a midstream counterparty can look stable when prices fall and still be exposed when volumes, credit quality, or regulatory decisions change. This guide walks through the functions in physical order and shows how companies in BTU Graph map to them.

Gathering, compression, and processing

The chain starts in the field. EIA describes gas flowing from wells through gathering pipelines to processing plants where contaminants and hydrocarbon gas liquids are removed, leaving dry natural gas suitable for pipelines. Gathering systems are local and tied to drilling activity, so their volumes depend on producer development plans. Compression is required throughout: at the wellhead, for gas lift, at gathering and processing facilities, and along transmission lines and storage.

Compression is often provided as a service. Archrock owns, installs, operates, and maintains compressor packages used from wellhead gathering through processing, transmission, and storage, with aftermarket parts and field service. Kodiak Gas Services owns and operates compression infrastructure for wellhead and centralized gas lift, gathering and processing, and enhanced oil recovery, supported by engineering, installation, and field maintenance. For these businesses, horsepower, utilization, uptime, and basin position are the operating facts that matter, rather than throughput tariffs.

NGLs and fractionation

Processing produces two streams: dry gas and a mixed stream of hydrocarbon gas liquids. EIA defines HGLs as hydrocarbons that are gases at atmospheric pressure and liquids under higher pressure, including ethane, propane, normal butane and isobutane, and natural gasoline. They are extracted at natural gas processing plants and from crude oil during refining. Fractionation separates the mixed stream into these purity products, which then move to petrochemical plants, heating markets, refineries, and export terminals.

Enterprise Products Partners illustrates the integrated version of this business. Its profile covers natural gas processing, NGL fractionation, crude oil, products, and petrochemical infrastructure, with pipelines, storage, marine terminals, and marketing linking U.S. production to refineries, chemical plants, domestic demand, and exports. When an NGL network is integrated from processing through export, its exposure is to the full set of handoffs rather than to a single pipeline tariff.

Transmission, storage, and terminals

Transmission pipelines move large volumes over long distances. EIA distinguishes interstate pipelines that cross state lines, intrastate pipelines that operate within one state, and Hinshaw pipelines that receive gas from interstate systems and deliver within a state. Storage balances seasonal and short-term swings; EIA notes that most U.S. underground gas storage is in depleted oil and gas fields, with the rest in salt caverns and aquifers. Oil and products have their own trunk pipelines, tank farms, and marine terminals.

Kinder Morgan operates pipelines and storage for natural gas, crude oil, refined products, carbon dioxide, and renewable fuels, together with liquids and dry-bulk terminals, and its gas business spans transmission, gathering, processing, storage, and LNG-terminal interests. Williams gathers, processes, stores, and transports natural gas, and its Transco pipeline links supply areas with customers along the Eastern Seaboard and Gulf Coast. Interstate pipeline rates and certificates are regulated at the federal level, so tariff filings and rate cases are part of the evidence base for these companies.

LNG export terminals as the end of the midstream chain

For natural gas leaving the country by sea, the last midstream step is liquefaction. Cheniere owns and operates liquefaction and export facilities at Sabine Pass, Louisiana, and Corpus Christi, Texas, where gas is received, liquefied, stored, and loaded onto ships. Some analysts classify LNG export as its own segment because it combines industrial-plant operations with long-term sale contracts and global shipping. BTU Graph's LNG companies guide covers that value chain in more detail.

How to evaluate a midstream company

Start by identifying the function: gathering, compression, processing, fractionation, transmission, storage, terminals, or export. Then identify how revenue is earned for that function: fee-based contracts, regulated tariffs, percentage-of-proceeds arrangements, keep-whole processing contracts, or marketing margins. Each carries different sensitivity to volumes and prices. A processing contract that pays a share of liquids proceeds behaves differently from a firm transportation contract that pays for reserved capacity whether or not it is used.

Next, look at the counterparties and the basin. Gathering and processing volumes follow producer activity in specific basins, so producer credit quality and development plans matter. Long-haul transmission and storage are more exposed to regional demand, seasonal spreads, and regulatory outcomes. Benchmark and basis prices still matter even for fee-based businesses, because they drive producer drilling, storage economics, and export arbitrage; Oil Price API, which publishes BTU Graph, supplies those market series as structured data for teams modeling midstream exposure.

Companies on this page are listed alphabetically and drawn from BTU Graph's public-evidence profiles. Inclusion is not an endorsement or a ranking, and the list is not a complete census of U.S. midstream operators. Confirm current assets, contracts, and regulatory status with company filings and the relevant regulator before relying on any profile for a commercial decision.