Does it sound like it could be this?

"In the oil and gas industry, flowlines are pipe lines that connect a single wellhead to a manifold or process equipment. In a larger well field, multiple flowlines may connect individual wells to a manifold. Then a gathering line may transfer the flow from the manifold to a pre-process stage or to a transportation facility or vessel."
https://www.ipieca.org/resources/energy-efficiency-solutions...


In the Schlumberger glossary they're described as follows:

"gathering lines
English | Español
1. n. [Production Facilities]
The pipes used to transport oil and gas from a field to the main pipeline in the area."
https://www.glossary.oilfield.slb.com/en/Terms/g/gathering_l...

Yet its Spanish translation there is "línea de recolección":

"líneas de recolección
English | Español
1. S. [Instalaciones de producción]
Tubos utilizados para transportar petróleo y gas desde un campo hasta la línea de conducción principal del área."
https://www.glossary.oilfield.slb.com/Terms/g/gathering_line...

Here's another example from Schlumberger:

"header
English | Español
...
2. n. [Production Facilities]
In a gathering system, a pipe arrangement that connects flowlines from several wellheads into a single gathering line."
https://www.glossary.oilfield.slb.com/en/Terms/h/header.aspx

The potential issue with this translation is that in other texts they refer to the pipeline leading into the manifold the gathering line:

"Oil and gas production handbook An introduction to oil and ...www.saudienergy.net
A production riser (offshore) or gathering line (onshore) brings the well flow into the manifolds. As the reservoir is produced, wells may fall in pressure and ..."