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 method of demulsifying an emulsion of oil and water whereby palm oil fuel ash, which is a low cost waster product obtained from oil palm processing, is added to the emulsion and the resulting mixture is agitated, thereby breaking the emulsion into an aqueous phase and an oil phase. Solid particles of palm oil fuel ash settle to the bottom of the aqueous phase, allowing easy separation of the oil phase, the aqueous phase, and the settled solid particles of palm oil fuel ash.

A two-step process to produce oil or gas from a subterranean formation wherein in a first step the subterranean formation is treated with an aqueous composition containing a chelating agent selected from the group of glutamic acid N,N-diacetic acid or a salt thereof (GLDA), aspartic acid N,N-diacetic acid or a salt thereof (ASDA), methylglycine N,N-diacetic acid or a salt thereof (MGDA), and N-hydroxyethyl ethylenediamine N,N′,N′-triacetic acid or a salt thereof (HEDTA) and wherein, in a next step, in the outlet streams from the subterranean formation the aqueous phase is separated from the non-aqueous phase.

A water treatment system and method. Influent water produced from an oil and gas production or the like is circulated in a multistage unit where the water is treated by degassing the water by saturating the water with air, stripping volatile compounds from the water, evaporating non-aqueous phase liquid petroleum from the water, repeatedly stripping and equilibrating inorganic carbons in the water, subliming semi-solids from the water, and breaking colloids in the water using continuous cavitation. Water from the multistage unit is clarified through floatation and sedimentation and biological material in the water is inactivated using irradiation. Water is then filtered before being provided as treated water for an application specific process such as electro desalination reversal, fracking reuse, or other wastewater recovery.

Inlet and outlet connections of a well manifold connect to integrated piping of a unitary vessel on a skid. The unitary vessel defines an interior separated into two chambers by a barrier. One chamber has a test inlet for well testing operation, and the other chamber has a production inlet for production operation. Each of the chambers is in communication with a gas outlet for gas, a water outlet for water, and a condensate outlet for condensate. Each of the chambers has a weir plate disposed in the chamber and separating the water outlet on a waterside of the weir plate from the condensate outlet on a condensate-side of the weir plate adjacent the barrier. During use, the second chamber can be isolated so well testing operation can be performed using the first chamber. Also, the first chamber can be isolated so production operation can be performed using the second chamber.

Tank for holding contents which can separate into different phases, said tank comprising at least two outlet pipes each provided through a bottom of the tank with a first end of the outlet pipes provided outside the tank and a second end provided inside the tank, the second ends of the at least two outlet pipes being provided at different heights within the tank.

Removable trap stations for hydrocarbon flowlines can be implemented as an apparatus. The apparatus includes a multi-phase fluid receiver body and a tank defining an interior volume. The fluid receiver body is configured to couple to a flowline carrying a multi-phase fluid including solids and liquids. The fluid receiver body includes an inlet portion configured to receive a portion of the multi-phase fluid including a portion of the solids flowing through the flowline into the receiver body. The fluid receiver body includes an outlet portion fluidically coupled to the inlet portion. The portion of the multi-phase fluid is configured to flow from the inlet portion to the outlet portion. The tank is fluidically and detachably coupled to the outlet and is configured to receive and retain the portion of the multi-phase fluid received through the inlet portion.

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.

Efficient and economical systems and processes described strive to minimize the amount of NGLs and gas purchased, by recycling and reusing the gas and NGLs from producing wells on site for enhanced oil recovery. The EOR fluid is maintained in the liquid phase, greatly reducing the cost and energy consumption of the EOR injection equipment needed. The processes and systems described avoid or significantly decrease the need to purchase NGLs and truck them to the site for EOR, avoid large amounts of compression work, and use refrigeration equipment as an option for improved equipment performance only when desired. Systems and processes use a one-step approach to separate and stabilize the crude from the produced water, the NGLs and the natural gas, reducing the complexity associated with oil production surface infrastructure and eliminating the vast majority of the fugitive emissions associated with current state-of-the-art oil production.

A variable oil field fluid treatment system and method of use which utilizes a pump, a desanding hydrocyclone, and/or a non-consumable or consumable mechanical solids filter, a membrane filtration unit, a pump, a granular carbon filter, and/or combinations therein.