Technical Documents
The PDF's available on each of the product pages contain the products entire details.
Products
Duplex Cartridge Filter Unit (TDW 610-50/40)
The Duplex cartridge filter unit is the most commonly used cartridge filter unit in the oilfield industry. This offshore proof, skid-mounted filter unit is equipped with all necessary valves and safety features. The Duplex offers the most cost effective way to clean-up all possible oilfield fluids. It allows you to simultaneously filter with one vessel, and easily change out the used cartridges of the other vessel.
System Design Features
- standard serial/ parallel configuration
- standard TDW 610 serial: 50 cartridges per vessel
- compact space saving design
- innovative easy push lever and easy to handle swing-away vessel lid
- swing-bolts and nuts for quick opening
- self sealing, service friendly cover gasket
- all 4 inch valves easy to operate from the front
- certified hoisting slings and forklift pockets
- safety valve set at 7 bar (105 Psi)
- robust offshore frame
Applications
- Completion fluids
- Water injection
- Produced water
- Seawater intake
- Oily water clean up
- Diesel
- Pre-filtration RO
Filter Unit Range
- TDW 610-50/40
- (standard)
- TDW 610-50/40-S (single)
- TDW 510-30/40
- (standard)
- TDW 510-30/40-S (single)
- Other types on request
Technical Specifications
| Type | TDW 610-50/40 |
|---|---|
| Number of cartridges per vessel | 50 cartridges |
| Max. recommended flow | 12.6 bbl/min (120 m3/hr) |
| Maximum working pressure | 7 bar (105 Psi) |
| Maximum working temperature | 158 °F (70 °C) |
| Design code vessels | PED (PD5500) |
| Design code frame | EN 12079 |
| Cartridge diameter | 2.5 ‘’ (6.35 cm) |
| Cartridge length | 40 ‘’ (101.6 cm) plug in type |
| Vessel diameter | 24 ‘’(610 mm) |
| Pipe size | 4 ‘’ |
| Material of vessel and piping | SS 316 L (all wetted parts) |
| Material frame | Carbon steel, epoxy coated |
| Main Valves | 4 ‘’ Butterfly valve, NBR seat, SS disc |
| Instruments | in/outlet pressure gauge (0-10 bar/0-150 Psi) |
| Lid seal | EPDM O-ring |
| Lifting | Hoisting slings (certifi ed) and forklift pockets |
| Vessel lid | Lever operated swing away |
| In-/ outlet | 4 ‘’ union fi g.100 inch on 4” NPT-M |
| Drain | 1 ‘’ SS 316 ball valve with 1”BSP-F |
| Vent | 1 ‘’ SS 316 ball valve with 1”BSP-F |
| Pressure relief valve | 1 ‘’ bronze, set point 7 bar (105 Psi) |
| Weight (empty) | 2650 Ibs (1200 kg) |
| Dimensions (Lx Wx H) | 7.38 x 3.94 x 6.6 ft (2.25x 1.20x 2.00 m) |
Vertical Pressue Leaf Filter Unit (600 VPL-DE)
The Vertical Pressure Leaf or Diatomaceous Earth filter unit is completely self-contained and equipped with all necessary auxiliaries to perform an effective filter job. The large filtration area of the VPL/ DE filter unit allows filtering fluids with a high dirt load, at a high flow rate, down to low NTU. The process design allows a laminar flow through the filter vessel and leafs. This results in a long filtration cycle and the lowest possible NTU output. There is no need for opening the filter vessel during clean out. This system saves up to 90% down time compared to conventional VPL system and filter presses.
System Design Features
- Revolutionary wash down system, saving time and therefore tminimizing downtime of the fi lter unit (<10 min)
- Compact and light weight design
- Innovated mixing system by air
- Designed for offshore duty
- Filter leafs in SS316L with polypropylene fi lter cloth
- The cake discharge is effi cient and quick
- Safety railing, ladder and service platform
- All major connections on one side
- Certifi ed hoisting slings and forklift pockets
- Closed system
- One frame
Applications
- Completion fluids
- Work over fluids
- Offshore brines
- Seawater
- Waste water treatment
Filter Unit Range
- 420 VPL-DE
- 600 VPL-DE
- 840 VPL-DE
- 1200 VPL-DE
Technical Specifications
| Machinery | 600 VPL-DE |
|---|---|
| Filter area | 600 ft2 (56 m2) |
| Number of filter leaves | 20 pcs |
| Material of filter leaves | SS 316L with polypropylene filter cloth |
| Maximiun flow | 15 BBl/min (145 m3/hr) |
| Maximum working pressure | 7 bar (105 Psi) |
| Maximum working temperature | 158 oF (70 oC) |
| Design code Vessel VPL/DE | PED (PD 5500) |
| Vessel diameter | 43.3 ” (1100 mm) |
| Volume mixing vessel | 13 BBL (2 m3) |
| Easy to handle vessel lid | Hydraulic jack operated |
| Safety valves set point | 7 bar (105 Psi) |
| Cleaning device | Pneumatic driven rotating device with high efficiency spray nozzle |
| Pump 1 | Pre coat air driven pumps |
| Pump 2 | Body feet air driven pump |
| Standard instruments |
|
| Control panel | Compressed air actuated, all main valves are operated from this easy access panel |
| Piping and connections | |
| Bypass | 4” SS |
| Dump connection | 4” SS hammer union fi g 100 4” NPT-M |
| Main butterfly valves | 4” air operated from control board |
| Inlet/outlet connections | 4” SS hammer union fi g 100 4” NPT-M |
| Washwater inlet | 2’’ SS union fi g. 100 on 2” NPT-M |
| Construction | |
| Weight (empty) | 9900 lbs (4500 kg) |
| Dimensions (LxWxH) | 9.2x 6.6x 9.7 ft (2.80x 2.00x 2.95 m) |
| Material of construction | SS 316L All wetted parts |
| Frame work | MPI & load test |
| Lifting | Forklift pockets and certifi ed hoisting slings |
Optional
- Double execution for continuous filtration
- Non-Pneumatic operated design
- Other vessel/ frame dimensions
- Other design codes (ASME)
- One frame with diesel driven pump
Voraxial Seperator
Twin Filter introduces the Voraxial separator. The Voraxial is a 3 phase centrifugal separator which finds its use in many industrial applications for separation of liquids with the simultaneous removal of solids. The separator creates high G-forces for effective separation of the different phases. Its simplicity, small size and low power consumptions makes it one of the most economic separators in the market today. No other centrifugal separator in the market today is able to achieve superior separation at such high flow rates, with little fl oor space and energy efficient than the Voraxial.
Techincal Specifications
| Model | Flowrate BWPD (m^3/hr) | Energy Hp (kW) | Footprint (m2) | G-force | Size (Inch) |
|---|---|---|---|---|---|
| VORAXIAL2000 | 2000 (13) | 3 (2,2) | 1,0 x 2,5 m | 350 | 2“ |
| VORAXIAL4000 | 15,000 (100) | 20 (15) | 1,2 x 4,5 m | 700 | 4“ |
| VORAXIAL8000 | 60,000 (400) | 50 (37) | 1,8 x 8,0 m | 1400 | 8“ |
Working Principle
A special designed impeller spins the incoming liquid creating a strong Vortex. Due to centrifugal forces, the lighter liquid is drawn to the centre of the Vortex while the heavier liquid is spun outward; the solids are forced to the wall of the separator and are collected at the end of the separation chamber and discharged. The lighter liquid (oil) is collected by the orifice in the centre, at the end of the separation chamber, and discharged through the light liquid drain. The heavier liquid (water) goes straight through the separator to the clean outlet. The unique hydrodynamic design of the open impeller ensures low shear of oil droplets and non clogging of the impeller.
Benefits
- Efficient separation of oil / particles / water
- Very high flow rates using small floor space
- De-oiling and de-sanding in one unit
- Acts as an axial flow pump
- Fluctuations in flow or concentration will not effect efficiency
- Simple and reliable, one moving part
- Low energy consumption
- Low shear and virtually non-clogging
- Small Footprint and Weight (1/4 – 1/5 of other technologies).
- Solids do not effect oil separation
Applications
- Produced water treatment
- Mud pit cleaning
- Slop water clean up
- Waste water treatment
- Completion fluids
- Pipeline/system purge
- clean up Hydro test
- discharges
- Ballast and bilge water
- clean up
- Run off water
- Oil spills
OilBlock Absorption Cartridge
Twin Filter OilBlock absorption cartridges are specifically designed and manufactured for the high efficiency removal of free, dispersed oils from water. They are being successfully applied in the oil and gas industry, and bilge water treatment systems, contaminated surface water run-off and other industrial process applications. The Oilblock absorption cartridge is filled with unique co-polymer. This element absorbs the hydrocarbons very fast and actual molecular bonds the oil. The water flows radial into the cartridge and the absorption media immediate encapsulate the oil and solidifi es. This standard size cartridge will fit into standard cartridge filter units.
The standard Oilblock cartridges will absorb 2ltr of oil before it reach its change out differential pressure of 2.5 bar. This unique cartridge blocks after saturation which is a very simple and effective indication for change out and prevent any bypass of oil.
Benefits
- 99% removal of all oils in one single pass
- Cartridge block after saturation, no pass of hydrocarbons possible
- Removal of all strong emulsified oil in a single pass
- The adsorption capacity is more than 2 times its own weight (up to 8 times)
- No release of absorbed hydrocarbons
- No direct contact with saturated media during handling
- High flow rates
- Reliable and simple solution
- Easy handling and operation
- Fit into existing cartridge filter units
Applications
- Mud pit cleaning
- Produced water treatment
- Clean up of displacement
- Water
- Acid flow back
- Completion fluids
- Pipeline/system purge/
- Clean up hydro test
- Discharges
- Ballast and bilge water
- Clean up
- Run off water
Technical Specifications
| Absorption media | Oilblock tm |
| Absorption capacity media | 2 kg of hydrocarbons per cartridge |
| Efficiency | >99% |
| Max. operating temperature | 60 deg.C (140 deg.F) |
| Working pH range | pH 1 -9 |
| Weight of media per cartridge | 0.5 kg (1.1 lbs) |
| Cartridge length | 40” |
| Cartridge diameter | 2 ½ “ |
| Connection | Type ‘222’ (Code 3) |
| Cartridge construction material | Polypropylene (caps and outer shell) |
| Max. recommended flow rate | 500 ltr/hour / cartridge (2.2 GPM) |
| Required back pressure | Not required |
| Required pre-filtration | 25 micron |
Ordering Code
| Part no.: TFOB 40-2OF/RF |
| Filling rate media: 1.1 lbs (0.5 kg) |
OilClog Absorption Cartridge
Twin Filter “OilClog” absorption cartridges are effective in various water treatment applications, but have been specifically designed and manufactured for produced water treatment at oil & gas production facilities. They obtain a high efficiency removal of free and dissolved hydro carbons (TPH) and emulsifi ed oils from water. They are being successfully applied in the oil and gas industry, and bilge water treatment systems, contaminated surface water run-off and other industrial process applications. The Oilclog absorption cartridge is fi lled with granulated organic material impregnated with a powerful surfactant. This element absorbs the hydrocarbons very quickly and bonds with the oil. The water fl ows from top to bottom through the cartridge and the absorption media immediately reacts with the hydrocarbons. The “Oilclog” cartridge will fit into standard Twin Filter cartridge filter units.
Benefits
- Maximum contact time due to top – bottom flow path
- 99% removal of strong emulsifi ed oils in one single pass
- Low capital investment
- Removal of dissolved hydrocarbons
- High absorption capacity, low waste volume
- High efficiency, no polish treatment required
- No direct contact with saturated media during handling
- No additional chemicals required
- Reliable and simple system, no maintenance
- Easy handling and operation
- Fit into existing cartridge fi lter units
Applications
- Produced water treatment
- Bilge water clean up
- Mud pit cleaning
- Run off water
- Acid flow back
- Completion fluids
- Waste water treatment
- Ground water
- Soil washing
- Slop water
Technical Specifications
| Adsorption capacity media | TFR25 (see table below) |
| Max. operating temperature | 60 deg.C (140 deg.F) |
| Cartridge length | 40” |
| Cartridge diameter | 2 ½” |
| Connection | Type ‘222’ (Code 3) |
| Required back pressure | 2 bar; 29 (Psi) |
| Working pH range | pH 1 -9 |
| Required pre-filtration | 25 micron |
| Cartridge construction material | Polypropylene (caps and outer shell) |
| Max. recommended flow rate | 500 ltr/hour / cartridge (2.2 GPM) |
OilClog (TFR25) absorbs the following Hydrocarbons:
- BTX
- Chromates
- Emulsified oil
- Organo tin
- Poly Chlorinated Benzene
- Poly Acrylic Hydrocarbons
- (Alkyl) Phenol’s
- Total petroleums hydrocarbons
Filter Cartridges (Absolute Pleated)
The manufacturing of the Twin Filter absolute (standard 65.5mm) cartridge has undergone a rigorous change. Now the fully thermal welded construction ensures safe usage in filtration with high temperature fl uids, acids, diesel, oily water and solvents. Furthermore our cartridge now has a fi rm outer-guard making it much stronger. The TH absolute rated filter cartridge is manufactured under high quality standards in our production facilities in the Netherlands. This high performance and cost effective pleated cartridge is especially manufactured for fi ltration of oilfi eld fluids. The TH cartridges assure the removal of particles in the size range, necessary to protect the formation. The pleated absolute cartridges have a diameter of 2 ½” (65.5mm), and the 6 ⅝” (168.28mm) high flow Magnum cartridge.
Benefits
- All TH pleated cartridges are Beta 5000 rated (effi ciency 99,98%)
- Colour code micron rating for easy recognition
- The three layer; glass fi bre between polyester filter layers for max removal performance, strength and stability
- Especially designed for the offshore industry
- World wide stocking of most common types
- Quality assured for all absolute cartridges
- Retrofits for all types and brands
Applications
- Completion fluids
- Work over fluids
- Gravel pack fluids
- Waste water treatment
- Diesel
- Fuel oil
- Sea/river/well
- Water
- Acids
- Solvents
- Gels
- Amines & Glycols
- Process water
- Prefi ltration RO
Technical Specifications
| Maximum differential pressure | 5.5 bar @ 25°C (80Psi @ 77°F) |
| Maximum working temperature | 176 °F (80°C) |
| Change out differential pressure | 2.5 bar (37 Psi) |
| Outside diameter (OD) | 2.5” (65mm) |
| Inside diameter (ID) | 1” (25.4 mm) |
| Filtration area | 0.25 – 0.75 m2 per 10” cartridge |
Filter Cartridges (Nominal Rated)
The nominal rated fi lter cartridges of Twin Filter are true depth filters. These cartridges are available in different types: wound and spun bonded. Our wound cartridges are manufactured with a choice of media, from the most common polypropylene to glass fibre for high temperature applica-tions. The spun bonded cartridges are thermally bonded micro fibres and contain no wetting agents, solvents, antistatic agents or binders. The nominal rated cartridges are rated from 0.5 to 150 micron.
Benefits
- The depth filter technique gives a high dirt holding capacity which results in a longer lifetime.
- Continuous wind pattern on all lengths of cartridges eliminates irregular joints an increases effective filtration area.
- Wide chemical compatibility.
- Thermo bonded end cap for maximum chemical and temperature compatibility.
- Especially designed for the high demanding offshore industry.
- Complete range both in cartridge size and micron ratings to cover all filtration needs in oilfield industry.
- Quality assured all nominal cartridges.
- Retrofi ts for all types and brands.
- World wide stocking of most common types.
- True-graded density captures particles throughout entire filter depth
Applications
- Completion fluids
- Work over fluids
- Gravel pack fluids
- Waste water treatment
- Diesel
- Fuel oil
- Sea/river/well
- Water
- Acids
- Solvents
- Gels
- Amines & Glycols
- Process water
- Prefiltration RO
Technical Specifications
| Length | 10”, 20”, 29¼”, 29½”, 30”, 40” |
| Rating | Nominal |
| Micron rating | 0.5 – 100 micron |
| Outside diameter (OD) | 2½” (65mm) |
| Connections | plug in type “222” (type 226, DOE) |
| Max. working temp. | 176°F (80 °C) |
| Max. differential pressure | 2.5 bar (40 Psi) @ 122°F (50°C) |
| Max. working pressure | 4.1 bar (60 Psi) @ ambient temperature |
Filter Bags
The use of filter bags is a simple and effective way of filtration. The filter media in the form of woven mono and multi-filament or needle felt fibres, manufactured into standard shapes and sizes of bags, are fitted with a top seal arrangement for location and sealing into a suitable vessel. In view of potentially high differential pressures, which can develop across the bag, it is logical to provide the housing with a support basket manufactured from perforated or woven wire mesh to retain the bag during operation. Filtration occurs on the inner face of the bag by impingement, inertial impact and diffusion. Thus all contaminants are collected in the bag, simplifying disposal of the bag, and contaminants, on change-out.
Benefits
- Long lifetime due to high flow rates, high effective filter area and high dirt holding capacity
- Flow of contaminated fluids from inside to outside of the filter bags
- All solids are retained in the bags
- A quick, clean and easy change out of fi lter bags
- Low operational costs
- Wide micron rating and a full range of materials for maximum fluid compatibility
- Worldwide stocking of most common types
- Easy handling
- Wide chemical compatibility
- Especially designed for the high demand offshore industry
- Retrofits for all types and brands
- Wide range to fit all Twin Filter and standard housings
Applications
- Completion fluids
- Work over fluids
- Gravel pack fluids
- Waste water treatment
- Diesel
- Fuel oil
- Sea/river/well
- Water
- Acids
- Solvents
- Gels
- Amines & Glycols
- Process water
- Prefi ltration RO
Technical Specifications
| Ratings | 1-200 μm |
| Inside diameter | 7.5” (190 mm) |
| Length | 30.5” (775 mm)* |
| Filter area | 5.4 ft2 (0.50 m2)* |
Dicalite (4200)
Diatomaceous Earth is a powder like substance composed of skeletal remains of microscopic plants. These deposits are mined and treated to suit various filtration needs. DE filtration with Dicalite 4200 with in series 2 micron absolute glassfibre pleated cartridges will give the optimum performance for filtration of completion fluids with sg up to 22 ppg.
Applications
- Completion fluids
- Workover fluids
- Gravel pack fluids
- Slop water clean up
- Waste water treatment
Technical Specifications
| Mineralogical | Diatomite – Essentially SiO2 |
| Type | Flux Calcined |
| Physical Form | Dry powder |
| Color | White |
| Permeability (PFR v)(1) | 2.7-3.6 Darcy |
| Density, (Wet) | max. 23.1 lbs/ft_ (0,37 kg/ltr) |
Documents
Filtration of Heavy Brines with a Vertical Pressue Leaf Filter Unit (VPL)
Summary of Major Points
Set up separate circulating system with storage/frac tanks (500 Bbl.), circulating measuring tank, and filtration unit. Use a min. 600 sq. ft. D.E. filter with duplexl 50 element filter unit downstream. Avoid polymer sweeps if possible. During drilling fluid displacement, reverse circulate at maximum rate.
Download Technical Documents [.PDF] (64KB)Comparison of Filter Press and VPL/DE Filters
Introduction
This letter intents to give an objective overview of the main differences between two commonly used filtration systems for Completion/Gravel Pack fluids.
There are mainly two groups of DE fi lters used in the OILFIELD INDUSTRY.
- D.E. fi lter presses or plate & frame.
- Twin Filter VPL DE pressure leaf fi lters.
DE stands for Diatomaceous Earth, which is a natural precoat material. Today Celite, Decalite, Perlite or Kieselguhr is also used as precoat (fi lter aid) material.
The first precoat filters used were DE plate and frame filters, which were developed in the beer industry.
Download Technical Documents [.PDF] (112KB)The Relationship Between Clean Fluids & Effective Completions
Abstract
The preponderance of evidence shows that completion effectiveness, and especially well productivity, is directly related to the use of clean completion and workover fluids.Even small amounts of solids (500 ppm) in completion and workover fluids can be enough to bridge in perforation tunnels, in channels behind pipe, and in gravel packs and in propped fractures. This plugging is responsible for many wells producing at 10-85% of full potential; for multiple squeeze attempts so often necessary to successfully seal cement channels; and for sticking pipe during concentric tubing operations.It is a widely held myth among industry operations personnel that plugging material is easily removed with reactive materials such as HF acid in the case of clay solids or HC1 acid in the case of carbonate solids. Tests and fi eld experience indicate that signifi cant increases in fl ow conductivity are obtained not only with clean fluids instead of muds and dirty fl uids, but also when larger pressure differentials into the wellbore exist while perforating.
Download Technical Documents [.PDF] (66KB)Field Evaluation (Field Evaluation of D.E. and Cartridge Filters for Completion/Workover Fluid Filtration SPE 16933)
Abstract
Proper filtration of “clean” brines is an important step in well workover or completion operations. The use of properly filtered brines has resulted in increased oil production in several Conoco wells in the Gulf Coast region. This is a direct result of reduced formation damage. The results of a 3-year field evaluation of D.E. and cartridge filter systems are reported and compared to findings of laboratory core flow tests to determine needed brine “clarity” for minimum formation damage. The evaluations show that even highly contaminated completion/workover fluids can be satisfactorily filtered to contain less than 50 mg/ltr of solids with either diatomaceous earth (D. E.) and/or cartridge filter systems. Both systems removed as much as 96 to 99 percent of influent solids. The D.E. filters. in general handled a much wider range of solids concentration more efficiently than the “nominal rating” cartridge filters. Laboratory core flow tests have shown that completion/workover fluids with approximately 5 mg/ltr of solids do not cause format ion damage with limited pore volume injection.
Download Technical Documents [.PDF] (453KB)