Published On : August 2026
Crude oil produced from a well does not go straight into a long-haul pipeline, and the facilities that bridge the gap are what this page describes.
Production arrives first at a tank battery, a cluster of storage and separation equipment serving one or several wells on a lease.
From there it must be measured, verified and admitted into a gathering system before it can move anywhere useful.
The facilities performing that step are the core of the crude oil pipeline injection stations market and they are more commercially significant than their size suggests.
The reason is that these are the points where legal ownership of the crude changes hands rather than merely where it changes pipe.
A producer selling barrels and a midstream company receiving them both rely on the measurement taken at that point to establish what was delivered.
That is why the industry describes the arrangement as custody transfer, and why measurement equipment sits at the centre of an otherwise unremarkable facility.
Six facility categories appear in this market, and they describe different positions along the path from lease to refinery.
Four pipeline categories then describe the lines those facilities connect into, running from small gathering lines to large trunk systems.
The two dimensions are closely related, since a facility connecting to a gathering line is a different asset from one connecting to a trunk pipeline.
This page describes facility and pipeline categories factually and provides no engineering, operational, safety or environmental guidance of any kind.
Nothing here describes how any facility or pipeline is operated, nor what any regulation requires of either.
Crude oil pipeline injection stations are the facilities where crude is admitted into a pipeline, and they are the largest infrastructure category in this market.
A station of this kind typically includes pumping, filtration, measurement and sampling equipment together with the controls that govern admission.
Its commercial purpose is to establish, to the satisfaction of both parties, what quantity and what quality of crude has been delivered.
Measurement equipment is consequently the part of the facility that receives the most commercial attention despite representing a modest share of its cost.
Gathering system injection points are the connections at which individual leases or batteries enter a wider gathering network.
They are smaller and far more numerous than main injection stations, and they are the fastest-growing infrastructure category in this market.
Their growth follows drilling directly, since each new producing location requires a connection before its output can move by pipeline.
That relationship makes this category the most immediate reflection of activity levels anywhere in the market.
Connection points are frequently built by the gathering operator rather than by the producer, under an agreement covering the production concerned.
Those agreements commonly dedicate the production to the system for a period, which removes it from contention by competing operators.
Dedication is one of the most important commercial features of this market and is why connection decisions carry consequences well beyond construction cost.
This page describes these facilities as market categories and says nothing about how any of them is built, commissioned or operated.
Delivery stations are the mirror image of injection stations, being the facilities where crude leaves a pipeline system rather than entering it.
They deliver into refineries, storage terminals, marine loading facilities and other pipeline systems depending on where they sit.
The equipment is broadly comparable to an injection station, since the same measurement and verification questions arise in the other direction.
Custody transfer stations describe facilities whose defining purpose is the transfer of ownership rather than the physical movement.
That transfer is exactly where the parties that own and use these facilities change, which is why the category exists separately at all.
In practice most injection and delivery stations perform custody transfer, and the separate category reflects emphasis rather than a different machine.
The commercial weight of these facilities rests on measurement accuracy, because the figures produced there determine payment between the parties.
Disputes in this market are consequently about measurement far more often than about physical performance.
That places a premium on equipment quality, calibration discipline and documentation, which is a commercial rather than an operational observation here.
Facilities of this kind cluster around refining centres, storage hubs and pipeline interconnections rather than around production.
Cushing in Oklahoma is the clearest concentration of them in the covered states, given its role as a delivery point for the wider market.
This page describes the category factually and gives no guidance on measurement, calibration or any operational practice.
Blending facilities combine crude streams of differing characteristics so that what leaves the facility is more consistent than what entered it.
The commercial purpose is that pipelines and refineries both work with defined stream specifications, and production does not naturally arrive matching them.
This page states that as the reason the category exists and says nothing about how any blending is performed or what any specification contains.
Blending capability generates the highest value per facility in this market, because it is scarcer than simple connection capability.
It also creates commercial optionality, since an operator able to blend can accept crude that a connection-only facility would have to refuse.
That optionality is what customers pay for, and it is a genuine basis for differentiation between operators.
Tank battery injection facilities sit at the opposite end of the scale, connecting an individual lease directly into a gathering system.
A tank battery is the cluster of storage tanks and separation equipment serving one or several wells on a lease.
Injection facilities at this level are the smallest and most numerous assets in the market and are frequently automated for unattended operation.
Their economics turn on installed cost against the volume they will carry over the connected life of the wells.
Basin decline rates matter directly here, since a facility built for initial production may handle far less within a few years.
That calculation is why connection decisions at this scale are made carefully despite the modest sums involved.
Gathering pipelines are small-diameter lines collecting production from leases and batteries and moving it to a central point.
They are the largest pipeline category in this market by connection count, though they carry the smallest volumes individually.
A gathering system is built as a network across a producing area rather than as a route between two points.
That structure means capacity and coverage develop together, and extending a system to a new area is a different exercise from adding volume to an existing one.
Gathering systems are typically owned by midstream companies operating under agreements with the producers whose output they carry.
Those agreements are the commercial substance of the business, and the pipe is the means of performing them.
Feeder pipelines connect gathering systems into the larger transmission and trunk network.
They are intermediate in diameter and volume and frequently mark the point where crude moves from one operator to another.
Interconnection at that point is a facility in its own right and is one of the station functions this market covers.
The gathering and feeder layer is where most of the facility count in this market sits and where activity most closely tracks drilling.
It is also the layer where competition between operators is most direct, since a producing area may be reachable by more than one system.
This page describes the categories factually and provides no guidance on design, construction or operation of any pipeline.
Transmission pipelines carry crude over longer distances between regions, and trunk pipelines are the largest lines within that category.
They move the volumes that gathering systems collect, delivering into refineries, storage hubs and export facilities.
Facilities on these systems are fewer and larger than those on gathering networks, and each handles substantially more volume.
Injection into a trunk system is typically from a terminal, a storage facility or another pipeline rather than directly from production.
What a facility does at that connection is described by the functions each facility performs, which differ considerably between the gathering and trunk layers.
Trunk systems in the covered states run principally from the Permian and Mid-Continent toward Cushing and the Gulf Coast.
That directionality shapes where facilities concentrate, with injection weighted toward the basins and delivery toward refining and export points.
Batch transfer is a characteristic of these systems, where distinct parcels of crude move through one line in sequence rather than as a single stream.
That practice creates requirements at both ends which the facilities have to accommodate commercially as well as physically.
Capacity on trunk systems is contracted rather than simply available, with shippers holding rights under agreements of varying length.
Access to trunk capacity is therefore a commercial question resolved through contracting rather than a physical question about connection.
This page describes the categories as market segments and states nothing about how capacity is allocated, scheduled or operated.
It is the facility where crude is admitted into a pipeline, typically including pumping, filtration, measurement and sampling equipment. Its commercial purpose is to establish, to the satisfaction of both parties, what quantity and quality of crude has been delivered.
Custody transfer is the point at which legal ownership of the crude passes from one party to another. The measurement taken there determines what is bought and sold, which is why measurement equipment receives commercial attention out of proportion to its share of facility cost.
A gathering pipeline is a small-diameter line collecting production from leases and batteries and moving it to a central point. Gathering systems are built as networks across a producing area rather than as routes between two points.
A tank battery is the cluster of storage tanks and separation equipment serving one or several wells on a lease. Injection facilities connecting a battery to a gathering system are the smallest and most numerous assets in this market.