As an integral element of oil and gas production, water management is especially important. Ovivo develops and implements innovative solutions to meet the challenges of treating water and wastewater for the O&G industry, addressing both upstream and downstream applications. Bespoke compact and light water and wastewater packages for offshore duties are a specialty of Ovivo. Where every kilogram and square meter of footprint saved dramatically reduces in rig costs, our advanced technologies create real value.
Across the world, Ovivo recommends and implements systems that are designed to meet the specific needs of each project site and secure the best value, for our customers. A broad range of technologies, coupled with unrivalled expertise and track record help Ovivo determine the best solutions for its clients. We can also provide turnkey solutions for major projects across the world.
Ovivo can be relied upon to recommend the ideal processes, technologies and products to address your particular circumstances and meet your specific requirements. Ovivo offers a full spectrum of reliable equipment for handling produced water. Our offerings have been proven over a broad range of applications and years of rugged and reliable performance. The offering includes primary, secondary, and tertiary treatment solutions for a broad spectrum of upstream installations, whether it’s onshore, fixed-offshore, or floating offshore facilities (TLPs, Spars or FPSOs). Ovivo has also been supplying high quality fresh water maker and water treatment packages for the Petrochemical & Offshore industries for over 30 years. Our knowledge and understanding of the demanding requirements of offshore specifications include NORSOK, Statoil TR’s & Shell DEP’s.
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Fresh water makers are life support systems on oil platforms, FPSO’s and FSO’s, and need to be extremely reliable and robust with minimal operator intervention and maintenance. Ovivo offers a fresh water maker built around normal offshore engineering standards, materials of construction and manufactured with a standard compact and modularized design.
- 25 year design life
- Easy installation
- Modular skid design can be arranged in various configurations
- All skids fit through standard 750mm doorways
- Advanced, back-washable, primary media filter
- Reduced downtime
Ovivo’s fresh water makers are designed to meet the stringent criteria of offshore facilities while still adhering to engineering specifications without sacrificing water quality. The quality of Ovivo’s fresh water maker meets all the major International and WHO standards for potable water.
Our fresh water makers are fabricated using a modest, sectional design that allows for flexible layout arrangements and easy access into tight machinery spaces for retrofits and upgrades. The Ovivo® FWM series has “plug and play” technology for quick assembly and installation. Inter-skid piping and cabling can be immediately connected if skid modules are delivered separately or if a module needs to be removed and replaced.
Primary Produced Water Treatment
In a typical crude oil production/separation, the crude oil from the production wells enters the production separator first, which is essentially a three (3) phase separator to remove the water and gas from the oil. Further treatment of the oil is carried out in the oil process train. The produced water from the crude oil separation train typically contains 500 – 2000 mg/l of free oil. The first step or primary treatment in produced water processing is to reduce the solids content if there is a high presence of solids which is followed by reduction of the oil content to below 500 mg/l by gravity separation using Liquid- Liquid Hydrocyclones, Skimmers, or CPI.
- OVIVO® Sand SpinTM Solid-Liquid Hydrocyclones
Ovivo’s portfolio of Desanding Hydrocyclones offers high efficiency removal of solids from produced water to protect downstream equipment. The solids, if not removed, can create downtime in produced water equipment due to erosion or blockage. Downtime results in higher maintenance costs and may result in interrupted oil production. Ovivo designs are constructed in line with industry standards including ASME, ANSI and NACE. The Hydrocyclone design has no moving parts, yields minimal to zero liquid loss and has a steady pressure drop, usually 3 – 11 psi. OVIVO Sand Spin technology can be applied across a wide range of onshore or offshore applications. For produced water applications, typical efficiencies are 95% removal of 40 microns and larger particles and 50% for 1-20 microns particles. OVIVO Sand Spin technology desanders are designed with a two-to-one turn down ratio with flow rates ranging from 100 to 450,000 BWPD per unit. The OVIVO Sand Spin technology desanders offer the smallest weight and dimensions on the market making them attractive for offshore installations. They are easy to install and are reliable during start-ups and operation.
- OVIVO® SpinTM Liquid-Liquid Hydrocyclones
Liquid-Liquid Hydrocyclones are more often than not, the primary separation equipment followed by Induced Gas Flotation (IGF) unit as secondary treatment for offshore installations. The OVIVO Spin line of Liquid-Liquid Hydrocyclones offers exceptional removal efficiencies of oil droplets 10 microns and larger. The probability of removing an oil droplet from the feed depends mainly upon the droplet diameter and the differential density between the two liquids. The larger the size and the differential density, the greater the separation efficiency.The individual hydrocyclones liners are installed within a pressure vessel and internally supported by tube plates. This arrangement allows easy access to all internal areas of the vessel for routine maintenance and inspection and also provides a compact design to suit offshore installations. The hydrocyclones liners may be easily withdrawn from the vessel and replaced with blanks to achieve further turndown if required. The OVIVO Spin system offers inherent reliability and has been designed to operate efficiently over a wide range of conditions, with reduced long term operating costs.
- OVIVO® SkimTM Skimmer Vessels
The OVIVO Skim system offers a more compact vertical skimmer for off-shore installation. This design can also be adapted to serve as a produced water degassing vessel. The OVIVO Skim technology provides an economical way to remove the bulk of the oil and contaminants. Horizontal designs are also available. Our range of skimmers are designed around separation of specified oil droplet size, typically 120-150 microns along with the allowable residence time. Horizontal designs can be supplied as atmospheric or pressurized vessels.
- OVIVO® SepTM Corrugated Plate Interceptors (CPI)
Ovivo offers two (2) designs of Corrugated Plate Interceptors (CPIs); the atmospheric design which is box type and the pressurized design which is fabricated in accordance with ASME VIII, Division 1 classification code. OVIVO Sep CPI separators are ideal for the separation, removal, and recovery of bulk oil and suspended solids from process water or wastewater streams. They provide an economical way to remove the bulk of the oil and contaminants and are most often the only separation equipment needed.
The OVIVO Sep equipment uses coalescing plate packs that induces small oil droplets to combine into larger, more easily separable droplets. The distributor plate spreads the flow evenly over the width and height of the plate packs. The individual plate packs are sloped to a 45o or 60o angle to minimize the possibility of sludge fouling. The advantages of OVIVO Sep Corrugated Plate Separators over other gravity separators such as API pits, settling tanks, are:
The vessel required is much smaller, resulting in lower capital and installation costs.
Plate separator packs can remove smaller size droplets, resulting in better separation efficiency.
Plate separator packs are fully enclosed and can be gas blanketed, eliminating emission of volatile organic compounds (VOCs) and reducing fire hazards.
The 60o plate angle and 0.75-inch spacing allows for efficient removal of solids, resulting in less fouling. Water Specialist for the Oil & Gas Sector
Secondary Produced Water Treatment
In many upstream installations, most notably offshore, a secondary treatment step represents the final step where discharges of 20 – 29 ppm of free oil content are permissible. Ovivo offers vertical Induced Gas Flotation (IGF) units which are used, almost exclusively, for off-shore installations, where deck space is at a premium. Ovivo also offers multicell horizontal IGF units, which although prevalent on on-shore installations, can be adapted for offshore application as well if required.
- OVIVO® FloatTM Induced Gas Flotation Units (IGF)
The Induced Gas Flotation (IGF) process involves introducing gas bubbles into the wastewater stream via a series of eductors. The gas bubbles are then released into the contact section of the vessel. The bubbles lift the entrained oil and solids which are then skimmed from the surface. The clarified effluent is discharged from the bottom of the vessel.
The OVIVO Float IGF design utilizes finely dispersed gas to reduce the apparent density of the oil and solids; increase droplets size and greatly improve buoyancy through coalescence.
If further treatment of produced water is required to meet disposal regulations or injection water quality requirements, a tertiary step can be implemented to meet those goals. Ovivo offers a line of robust, industry standard, proven equipment.
- OVIVO® MediaTM Multimedia Filters
Where produced water treatment requires greater than 95% removal of 2-5 micron removal of both oil droplet and solids, Ovivo offers a line of OVIVO Media multimedia filters. These systems are fully automatic in operation requiring less operator intervention. In normal operation all filters run in parallel with all filters on-line, until the run terminates with each filter withdrawn on a cyclic basis to undergo backwash. Ovivo offers an air scour blower system as part of the media cleaning system to ensure that the media bed is fluidized to remove all trapped solids.
Ovivo uses a three (3) or four (4) media layer system depending on effluent water quality requirements. The use of different grades of filtration media allows a gradual coarse to fine media size to capture particles.
- OVIVO® ShellTM Nutshell Filters
Similar to the OVIVO Media multimedia filters, the OVIVO Shell nutshell filters are media based filters. Nutshell filters are proven to remove greater than 98% removal of 5 micron oil droplet and solids. The technology was developed more than thirty years ago with the objective of providing better filtration performance than conventional sand and mixed media filtration systems. An important characteristic of the walnut and pecan shell medium is its hydrophilic property which results in captured oil droplets having a greater tendency to remain in droplet form on the surface rather than coating the medium as is the case with other filtration media. Oil is trapped by adsorption within the fibers of the nutshells and solids are retained by entrapment between the nutshell particles.
The OVIVO Shell nutshell filter uses a specific blend of nutshells (Black Walnut, English alnut and Pecan shells). The systems are fully automatic requiring less operator intervention. Normal filtration is down through the media bed.
- Cartridge Filters / Coalescers
As part of the tertiary system or overall produced water treatment package, Ovivo can provide a cartridge filter/coalescer system. This system is typically provided as a polishing step to meet stringent requirements. Typical process guarantee for systems incorporating cartridge/coalesce system is 10 ppm or less of free oil in the final treated produced water effluent. The cartridge filters/coalesces are rarely supplied as standalone units.
- Microfiltration & Ultrafiltration
Where even more stringent produced water effluent water quality is required i.e. surface discharge, or produced water that may be potentially used for irrigation or injection, Ovivo offers Microfiltration (MF) or Ultrafiltration (UF) units. These units may be followed by nanofiltration (NF) and/or Reverse Osmosis system if the process dictates. Typical membranes used for Microfiltration and Ultrafiltration are hollow fiber type. MF has the largest pore size 0.1 to 1 microns and UF pore sizes range from 0.01 to 0.1 micron. Both designs can operate in Cross flow or dead end filtration mode. The MF and UF systems are used to primarily remove suspended solids, bacteria and reduce turbidity.
- Reverse Osmosis Systems
Reverse osmosis (RO) is a water purification process that uses a selectively semi-permeable membrane. In RO, pressure is applied to overcome osmotic pressure, a property that is governed by chemical potential, a thermodynamic parameter. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to the other side. Whereas MF and UF targets suspended solids, the RO targets dissolved ions.
Compared to other desalination technologies such as evaporators, RO does not require thermal energy. Ovivo can supply a fully functional automated RO system to complement a produced water package when required.
- Chemical Dosing Systems
Ovivo can include chemical dosing systems as part of a produced water package. Most commonly used chemicals in produced water are the reverse demulsifier and flotation aid. Dosage rates and performance are set by chemical metering pumps. The metering pumps commonly used are diaphragm type conforming to API-675. Chemical dosing packages are rarely supplied as stand-alone units.