EP0273463A1 - Méthode de nettoyage des réservoirs de stockage pour des produits de champ pétrolifère - Google Patents

Méthode de nettoyage des réservoirs de stockage pour des produits de champ pétrolifère Download PDF

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Publication number
EP0273463A1
EP0273463A1 EP87200001A EP87200001A EP0273463A1 EP 0273463 A1 EP0273463 A1 EP 0273463A1 EP 87200001 A EP87200001 A EP 87200001A EP 87200001 A EP87200001 A EP 87200001A EP 0273463 A1 EP0273463 A1 EP 0273463A1
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EP
European Patent Office
Prior art keywords
oil
tank
sediment
water
hydroclones
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP87200001A
Other languages
German (de)
English (en)
Inventor
Arnold M. Lapre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ARFAZ EQUIPMENT
Original Assignee
ARFAZ EQUIPMENT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ARFAZ EQUIPMENT filed Critical ARFAZ EQUIPMENT
Priority to EP87200001A priority Critical patent/EP0273463A1/fr
Publication of EP0273463A1 publication Critical patent/EP0273463A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
    • B08B9/0933—Removing sludge or the like from tank bottoms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays

Definitions

  • the object of the invention to provide a method which removes the sediment from the tanks, recovers 95% of the oil, and dries the solids.
  • the water and oil are to be re­turned to the main plant inlet for separation.
  • the dried and cleaned solids can be sent to acceptable disposal sites, so that tank bottom sediment waste disposal costs are reduced, waste disposal volumes are reduced, and the oil can be recovered from the sediment.
  • the invented method for removing bottom sediment slurry from oil­field product storage tanks is characterized in that after discharge of the oil the oil tank is filled with water to a level which is about five times the thickness of the slurry, in that the slurry is suspended in the water by mixing, in that the mixture is circulated through hydroclones which remove the sus­pended sediment from the water, so that the water is drained to a process tank and the sediment to a relatively small sediment tank, in that the sediment is heated to approximately 200° F in the sediment tank and then pumped to at least one centrifuge which separates dry solids from the oil and water which oil and water gravitates into an oil tank for recovered oil.
  • the mixing in the oil tank is preferably effected by Jensen side entry mixers.
  • the hydroclones preferably are centrifugal separators similar to drilling mud desanders and desilters.
  • the tank cleaning system is divided into two separate systems which are depicted in fig. 1:
  • Cleaning by mixing and circulating the tank 1 consists of sus­pending the sediment in water in the tank using a tank mixer 2 and circulating the tank contents through hydroclones 3 to remove the sediment from the water.
  • the conventional method consists of flushing the sediment with high pressure water and hauling it by vacuum truck to a process tank 4.
  • Tank cleaning by mixers consists of closing in the tank 1 and floating off the oil pad leaving 16-18 feet of water and 3-4 feet of sediment in the tank. The sediment is then suspended in the water by using a vari angle tank mixer 2. The tank is mixed for four hours to loosen the sediment on the bottom, but complete suspension is not obtained in this time. After mixing for four hours, the tank contents are circulated at a rate of 1,000 bbl. per hour by pump 5 driven by a 40 hp motor, through hydroclones 3 also using a recirculation pump 6 driven by a 40 hp motor. The pump 5 pulls suction off of the bottom of the tank through 3-8 ⁇ bottom drain lines 7 as shown in Figure 2. The hydroclones, which will be discussed later, remove the suspended sediment from the water.
  • This method is over 90% effective in cleaning the thank and requires 48 hours to clean a 10,000/bbl. tank with approxi­mately 4 feet of sediment on the bottom.
  • the water is then drained into the the 10,000 bbl. process tank 4 and the real tank 1 is put back into service. Any remaining sediment in the water is allowed to settle in the process tank 4 before the water is returned to the produced water treating system.
  • the hydroclones 3 are centrifugal separators very similar to drilling mud desanders, used to remove the sediment suspended in the water.
  • Figure 3 is a diagram of a typical hydroclone.
  • the fluid enters through a tangential opening 8 in the large end of a cone-shaped housing 9. This results in a whirling motion or cyclone action of the fluid.
  • a short pipe 10 called the "vortex finder” extends down into the cone body from the top, forcing the whirling stream downward toward the small end (apex or underflow) of the cone body. Larger and/or heavier particles are thrown outward toward the wall of the cone while lighter and/or smaller particles remain in the center with the moving fluid. The larger particles and a small amount of fluid will pass out the apex 11. The remainder of the fluids is sucked up through the vortex finder by the vacuum created in the eye of the cyclone.
  • Desanders - consisting of two 12 inch hydroclones operating in parallel. These units handel 500 gallons a minute each and will remove particle sizes down to 25-30 microns. Desilters - consisting of twelve 4 inch hydroclones operating in parallel. These units handle 83 gallons a minute each and will remove particle sizes down to 10-15 microns.
  • the sediment is accumulated in a 500 bbl. sediment tank 12 which can be heated to approximately 200° F by a heating means 13 to aid in the oil recovery process.
  • the sediment is pumped, using a progressive cavity pump 14, with 3hp motor and variable speed drive, to a centrifuge 15. Condensate or cutter stock is injected into the pump suction to act as a solvent to aid in recovering the oil.
  • the cleaned solids accumulate in a storage area and the oil and water gravitate into a recovered oil tank 16.
  • Condensate is more commonly known as casing blow oil in steam flood operations. It is the ligt-ends which are released from the crude oil by steaming the formation. The condensate is recovered by condensing the steam and hydrocarbon vapors bled off producing well casings. Condensate is 30° API oil and is a good, inexpensive cutter stock for the sediment processing system. The system requires approximately 1 barrel of condensate per 2 barrels of heavy oil recovered.
  • the decanting centrifuge 15 illustrated in Figure 4 and driven by a 15hp motor is basically a rotating cone-shaped drum 17 that turns at high speeds, and an auger 18 within the drum that moves the coarse particles to a discharge port 19.
  • the rotation creates forces of 600-800 G's giving a very efficient particle size separation.
  • the larger or heavier particles are thrown to the outside of the drum.
  • the auger which rotates a few RPM's slower than the drum, scrapes the particles off the side of the drum and out the discharge port 19.
  • the fluids in the center of the bowl discharge through the liquid discharge ports 20 at the opposite end.
  • the centrifuge is capable of removing particle sizes to 5 microns, thereby removing 99% of the particles in the sediment.
  • the oil generated by the processing system is 16-17° API gravity consisting of 5-10% very fine solids by volume with some emulsion. It is blended slowly into the gathering system upstream from the dehydration plant inlet. Injecting it too fast into the system creates treating problems in the oil phase at the plant. A separate treating system and new chemicals are being horriblygated to treat this oil along with other waste oil. Sodium silicate has been used successfully in batch treating the oil.
  • the solids in the sediment may cause various wear problems in the equipment.
  • the hydroclones have to be rubber-lined for easy replacement and wear reduction. Replacement parts for the pump have to be kept in store.
  • the centrifuge would pack off at the solids discharge chamber. A wiper can be installed to solve this problem. Very little wear has been noted in the centrifuge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Centrifugal Separators (AREA)
  • Treatment Of Sludge (AREA)
EP87200001A 1987-01-02 1987-01-02 Méthode de nettoyage des réservoirs de stockage pour des produits de champ pétrolifère Withdrawn EP0273463A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP87200001A EP0273463A1 (fr) 1987-01-02 1987-01-02 Méthode de nettoyage des réservoirs de stockage pour des produits de champ pétrolifère

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87200001A EP0273463A1 (fr) 1987-01-02 1987-01-02 Méthode de nettoyage des réservoirs de stockage pour des produits de champ pétrolifère

Publications (1)

Publication Number Publication Date
EP0273463A1 true EP0273463A1 (fr) 1988-07-06

Family

ID=8197564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87200001A Withdrawn EP0273463A1 (fr) 1987-01-02 1987-01-02 Méthode de nettoyage des réservoirs de stockage pour des produits de champ pétrolifère

Country Status (1)

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EP (1) EP0273463A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0381488A2 (fr) * 1989-02-01 1990-08-08 Great Eastern (Bermuda) Ltd. Méthode de récupération des résidus d'huile noire
WO1996009895A1 (fr) * 1994-09-28 1996-04-04 Serck Baker Limited Traitement de materiau particulaire
DE10114753A1 (de) * 2001-03-22 2002-10-02 Bruno Falkenstein Gmbh Reinigungssystem und Verfahren zur Reinigung von Heizöl
EP1603817B1 (fr) * 2002-11-05 2010-03-31 Kcc Group Limited Appareil con u pour transferer des solides deposes ou en suspension d'un recipient ouvert dans un recipient ferme
CN104609603A (zh) * 2015-01-28 2015-05-13 天津市瑞德赛恩新材料开发有限公司 一种fpso油舱污油泥清洁一体化处理方法
CN107381914A (zh) * 2017-08-04 2017-11-24 华东理工大学 一种海上气田平台生产水处理方法及其装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530131A (en) * 1983-10-28 1985-07-23 The United States Of America As Represented By The Secretary Of The Navy Automatic vacuum recyclable system for chemical-thermo cleaning of ship tanks and bilges
EP0160805A2 (fr) * 1984-03-13 1985-11-13 FIPROSA Holding Méthode et dispositif pour la récupération du pétrole brut ou de ses produits raffinés à partir de leurs dépôts sédimentés en boues épaisses à compactes
GB2166043A (en) * 1984-10-19 1986-04-30 William G Urbani Tank cleaning system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530131A (en) * 1983-10-28 1985-07-23 The United States Of America As Represented By The Secretary Of The Navy Automatic vacuum recyclable system for chemical-thermo cleaning of ship tanks and bilges
EP0160805A2 (fr) * 1984-03-13 1985-11-13 FIPROSA Holding Méthode et dispositif pour la récupération du pétrole brut ou de ses produits raffinés à partir de leurs dépôts sédimentés en boues épaisses à compactes
GB2166043A (en) * 1984-10-19 1986-04-30 William G Urbani Tank cleaning system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0381488A2 (fr) * 1989-02-01 1990-08-08 Great Eastern (Bermuda) Ltd. Méthode de récupération des résidus d'huile noire
EP0381488A3 (fr) * 1989-02-01 1991-10-23 Great Eastern (Bermuda) Ltd. Méthode de récupération des résidus d'huile noire
WO1996009895A1 (fr) * 1994-09-28 1996-04-04 Serck Baker Limited Traitement de materiau particulaire
DE10114753A1 (de) * 2001-03-22 2002-10-02 Bruno Falkenstein Gmbh Reinigungssystem und Verfahren zur Reinigung von Heizöl
DE10114753B4 (de) * 2001-03-22 2008-02-21 Thomas Falkenstein Gewerbliche Vermietung Und Verpachtung E.K. Reinigungssystem und Verfahren zur Reinigung von Heizöltanks
EP1603817B1 (fr) * 2002-11-05 2010-03-31 Kcc Group Limited Appareil con u pour transferer des solides deposes ou en suspension d'un recipient ouvert dans un recipient ferme
CN104609603A (zh) * 2015-01-28 2015-05-13 天津市瑞德赛恩新材料开发有限公司 一种fpso油舱污油泥清洁一体化处理方法
CN107381914A (zh) * 2017-08-04 2017-11-24 华东理工大学 一种海上气田平台生产水处理方法及其装置
WO2019024915A1 (fr) * 2017-08-04 2019-02-07 华东理工大学 Procédé et dispositif de traitement d'eau extraite à partir d'une plate-forme de gisement de gaz en mer

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