A separation device features a coalescing media and a magnetic separation insert. The coalescing media includes vertically assembled perforated sheets having surfaces with openings. The sheets form a coalescing media interior space in the separation chamber, and are configured and shaped to slow down hydronic fluid and enable entrained gasses, ferromagnetic or ferritic particles and other solids to coalesce and come out of a hydronic fluid via a coalescing action caused by the hydronic fluid contacting and flowing through the coalescing media. The magnetic separation insert is coupled to a bottom portion of the separation device and arranged in the coalescing media interior space and has a non-magnetic sleeve that surrounds a removable magnet insert that generates a magnetic field to attract and collect the ferromagnetic or ferritic particles on the non-magnetic sleeve that coalesce and come out of the hydronic fluid, and can be removed from inside the non-magnetic sleeve to release the ferromagnetic or ferritic particles attracted and collected on the non-magnetic sleeve so released ferromagnetic or ferritic particles fall to the bottom portion of the separation chamber.

Hydrocarbon gas capture from a well stream can involve recovering light hydrocarbon gases from liquids and solids via a multiphase separator that is upstream of a sand removal system. Pressure is controlled in the multiphase separator to facilitate hydrocarbon gas capture. The light hydrocarbon gases can be recovered for sale or can be used on-site.

A method of treating oil and gas produced water may include: receiving produced water from one or more wells; separating an aqueous portion of the produced water from oil and solids included in the produced water in order to provide recovered water; performing anaerobic bio-digestion of organic matter included in the produced water using a biomass mixture of anaerobic bacteria obtained from a plurality of wells; aerating the recovered water in order to promote metal precipitation; and performing aerobic bio-digestion of organic matter present in the recovered water. Some embodiments may also include one or more of anoxic equalization, filtration, pasteurization, reverse osmosis, and biocide treatment of the recovered water. The recovered water may be used for oil and gas well fracking and/or land and stream application. Other methods of treating oil and gas produced water are also described.

A separator fluidly connected to a wellbore includes: a vessel defining an interior chamber; an inlet for delivering fluid produced from a wellbore into the vessel at a first pressure; an outlet through which gas is directed out of the vessel at a pressure substantially equal to the first pressure; at least one liquid/oil level sensor capable of detecting the level of liquid within the interior chamber of the vessel and the level of oil within the interior chamber; two electronically controlled valves in fluid communication with the vessel; and a controller connected to the at least one liquid/oil level sensor and the electronically controlled valves and programmed to, in response to a level of the liquid and a level of oil in the interior chamber of the vessel: open, close, or modulate the electronically controlled valves to regulate the combined flow liquid and oil out of the vessel.

A foreign matter removal device removes foreign matter contained in a fluid. The fluid is caused to flow into the trap portion and is separated into an inner fluid flowing inside a separation portion and an outer fluid flowing outside the separation portion. First foreign matter contained in the outer fluid and having a higher specific gravity than the fluid is captured in a gap between an inner wall of the trap portion and the separation portion. Separation of second foreign matter contained in the inner fluid and having a lower specific gravity than the fluid is promoted by a gas-liquid separation portion, and the second foreign matter is discharged to outside, through a foreign-matter-discharging-means-connection portion provided in a ceiling on the vertically upper side at a center part of the trap portion, from foreign-matter-discharging means.