WO2012110993A1 - Inhibition de la croissance bactérienne dans des fluides de gisements de pétrole - Google Patents

Inhibition de la croissance bactérienne dans des fluides de gisements de pétrole Download PDF

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Publication number
WO2012110993A1
WO2012110993A1 PCT/IE2012/000005 IE2012000005W WO2012110993A1 WO 2012110993 A1 WO2012110993 A1 WO 2012110993A1 IE 2012000005 W IE2012000005 W IE 2012000005W WO 2012110993 A1 WO2012110993 A1 WO 2012110993A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight
approximately
tablet
sodium
amount
Prior art date
Application number
PCT/IE2012/000005
Other languages
English (en)
Inventor
Ulick Stafford
Ronald Joe Starkey
Original Assignee
Medentech Limited
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 Medentech Limited filed Critical Medentech Limited
Publication of WO2012110993A1 publication Critical patent/WO2012110993A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/605—Compositions for stimulating production by acting on the underground formation containing biocides
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/34—Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/66—Compositions based on water or polar solvents
    • C09K8/68—Compositions based on water or polar solvents containing organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens

Definitions

  • Fracturing is a treatment that is commonly performed to stimulate the flow of oil and gas in oil and gas wells. Fracturing fluids are pumped at high pressure into the oil or gas reservoir to cause a fracture in the reservoir through which oil can flow from the reservoir.
  • Fracturing fluids contain a range of different agents, depending on the characteristics of the reservoir.
  • the fluids are generally prepared at or close to the well site. Large volumes of water are required. The water is drawn from a wide range of sources and stored in large storage tanks.
  • NaDCC sodium dichloro-isocyanurate
  • effervescent material aids in the dissolution and dispersion of the NaDCC in the stagnant fracturing tank.
  • NaDCC has a high solubility and produces hypochlorous acid at a neutral pH.
  • the neutral pH hypochlorous solution is less corrosive than other forms of hypochlorous - generating materials such as bleach or TCCA.
  • Further advantages of NaDCC in fracting/stimulation applications consist of well defined demand testing procedures that can be performed on site to minimise use of the biocide.
  • NaDCC is currently used in treating potable water and there is a large body of empirical data showing its safety, should aquifer contamination take place.
  • a water soluble sanitising tablet composition comprising sodium dichloro-isocyanurate and an effervescent base.
  • the effervescent tablet format has the advantages of being in a unit dose format, which self-dissolves in water, to produce sanitizer solutions of known and accurate strength, without having to weigh out powders, measure out liquids and to compute the required dosage and solution strength. Tablets are easier and safer to handle and store, and they do not spill.
  • the effervescent base may comprise an alkali buffering agent, an aliphatic carboxylic acid and an alkali metal bicarbonate to provide a sanitising solution having a weakly acid to neutral pH. (5.5 to 7.5)
  • Sodium dichloro-isocyanurate is readily soluble in water, producing solutions that are effective sanitisers and, more particularly in relation to this invention, remain active over a wide range of pH.
  • the alkali buffering agent is sodium carbonate.
  • Sodium carbonate is readily soluble in water, is available in pharmaceutical or food grades and is strongly alkaline.
  • the alkali metal bicarbonate is sodium bicarbonate.
  • Sodium bicarbonate readily dissolves in water and causes effervescence releasing carbon dioxide gas. Potassium bicarbonate may also be used.
  • the aliphatic carboxylic acid is adipic acid.
  • Adipic acid has the advantage of being non hygroscopic, which helps to preserve the integrity and stability of the finished tablet formulation. Adipic acid also has lubricating properties that aid the tabletting process. Malic acid, succinic acid, citric acid, ascorbic acid, fumaric acid, tartaric acid, citric anhydride, succinic anhydride, sodium dihydrogen phosphate, disodium dihydrogen pyrophosphate, or acid citrate salts may also be used.
  • the tablet composition used in the invention preferably delivers up to 40 ppm of available chlorine to the fracting water.
  • 40 ppm available chlorine solution has the wide-spectrum activity necessary for effective sanitation, being effective against cysts, viruses, mycobacteria, bacteria and fungi and is within WHO organisation recommendation for drinking water.
  • the invention delivers approximately 5 ppm of available chlorine to the fracting water.
  • 5 ppm available chlorine solution has the wide-spectrum activity necessary for effective sanitation, being effective against cysts, viruses, mycobacteria, bacteria and fungi and is close to the maximum amount of chlorine recommended by US EPA for drinking water. Use of this amount of chlorine will not pollute ground water if fracting water leaks into water aquifers.
  • the water soluble disinfecting tablet may consist essentially of:- from 35% to 65% by weight of sodium dichloro-isocyanurate;
  • the water soluble disinfecting tablet may consist essentially of:- from 40% to 50% by weight of sodium dichloro-isocyanurate;
  • the water soluble disinfecting tablet consists essentially of:- from 40% to 45% by weight of sodium dichloro-isocyanurate;
  • the tablet comprises approximately sodium dichloro-isocyanurate 42%, sodium bicarbonate 19%, adipic acid 19% and sodium carbonate 20%.
  • the water soluble disinfecting tablet may consist essentially of:- from 48% to 52% by weight of sodium dichloro-isocyanurate;
  • the tablet comprises approximately sodium dichloro-isocyanurate 50%, sodium bicarbonate 23%, adipic acid 22% and sodium carbonate 5%.
  • the invention also provides a water soluble sanitising composition for use in fracting tanks comprising a chlorinated isocyanurate and an effervescent base, the effervescent base comprising sodium carbonate, adipic acid and sodium bicarbonate in an approximate weight ratio of 1 : 1 : 1.
  • the invention further provides a water soluble sanitising composition for use in fracting tanks comprising a chlorinated isocyanurate and an effervescent base, the effervescent base comprising sodium carbonate, adipic acid and sodium bicarbonate in an approximate weight ratio of 1 :5:5.
  • the tablet compositions used in the invention may be formed by a direct compression technique, which enables the manufacture of the alkali effervescent tablets without pre-processing by granulation and drying of the ingredients or addition of tabletting aids.
  • the invention provides a method to sanitise water used for fracting prior to the dissolution of biodegradable friction reducers by adding an effervescent tablet containing sodium dichloro- isocyanurate. The effervescent action of the tablet dissolution mixes the disinfectant chlorine in the stagnant water in the tank.
  • several tablets may be added in a bag.
  • the bag may be opened prior to the addition of the tablets or the bag may be of a water soluble material.
  • the number of tablets in the bag will be calculated to add the appropriate concentration of chlorine to the water in the tank to disinfect the water.
  • the present invention provides a method of treating a fracturing liquid water soluble composition comprising sodium dichloro-isocyanurate and an alkali buffering effervescent base, which provides a non-toxic solution having a weakly acidic to neutral pH from between 5.5 and 7.5. This is a pH range that will not cause corrosion of the fracting tanks.
  • the composition is very stable in solution and simple to use.
  • composition of the invention is produced in a solid tablet form.
  • a solid tablet form eliminates the necessity to weigh out a quantity of powder or granules each time a sanitiser solution is required and avoids storage problems with such particulates. Using a single solid tablet form also ensures that a sanitising solution having an accurate and known disinfectant concentration is produced in a one step process.
  • the handling of a solid tablet form is also easier and safer than handling chlorinated powders or granules or hypochlorite solutions.
  • Effervescent tablets are preferred because they disperse quickly in solution and dissolve the active ingredient. There is no need to crush the tablets and/or stir the solutions to achieve a clear sanitising solution within a reasonable time period.
  • Tablets are prepared having the following formulation by weight. The formulation given is for a single tablet.
  • Sodium carbonate 20% 8.15g sodium dichloro-isocyanurate, 3.75g sodium bicarbonate, 3.59g adipic acid and 3.76g of sodium carbonate are weighed out and dry blended together. The dry blend is then compressed by direct compression (on chrome plated tooling) into tablets. pH 7.01 in solution of deionised water. This pH is ideal for drinking water (allowed range by EPA 6.5-8.0). This pH balanced formula would be very safe if water is lost to the ground water and would be ideal water for preparing the fracting solution.
  • Tablets are prepared having the following formulation by weight. The formulation given is for a single tablet.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Plant Pathology (AREA)
  • Pest Control & Pesticides (AREA)
  • Agronomy & Crop Science (AREA)
  • Toxicology (AREA)
  • Dentistry (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Medicinal Preparation (AREA)

Abstract

Le procédé ci-décrit qui permet d'inhiber la croissance bactérienne dans des fluides de gisements de pétrole comprend l'ajout audit fluide d'une composition pour comprimé contenant du dichloroisocyanurate de sodium en une quantité apte à fournir une action biocide efficace, et d'une base effervescente. Le comprimé donne une solution désinfectante ayant un pH dans la plage de 5,5 à 7,5.
PCT/IE2012/000005 2011-02-15 2012-02-15 Inhibition de la croissance bactérienne dans des fluides de gisements de pétrole WO2012110993A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161442925P 2011-02-15 2011-02-15
US61/442,925 2011-02-15

Publications (1)

Publication Number Publication Date
WO2012110993A1 true WO2012110993A1 (fr) 2012-08-23

Family

ID=45809366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IE2012/000005 WO2012110993A1 (fr) 2011-02-15 2012-02-15 Inhibition de la croissance bactérienne dans des fluides de gisements de pétrole

Country Status (1)

Country Link
WO (1) WO2012110993A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010113144A2 (fr) * 2009-03-31 2010-10-07 Medentech Limited Composition de pastille
US20100307757A1 (en) * 2009-06-05 2010-12-09 Blow Kristel A Aqueous solution for controlling bacteria in the water used for fracturing
US20100311623A1 (en) * 2009-06-05 2010-12-09 Kroff Well Services, Inc. Fluid Treatment Systems, Compositions and Methods for Metal Ion Stabilization in Aqueous Solutions
US20110287984A1 (en) * 2010-05-21 2011-11-24 Andrey Mirakyan Treatment fluids made of halogenisocyanuric acid and its salts for operations in a well

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010113144A2 (fr) * 2009-03-31 2010-10-07 Medentech Limited Composition de pastille
US20100307757A1 (en) * 2009-06-05 2010-12-09 Blow Kristel A Aqueous solution for controlling bacteria in the water used for fracturing
US20100311623A1 (en) * 2009-06-05 2010-12-09 Kroff Well Services, Inc. Fluid Treatment Systems, Compositions and Methods for Metal Ion Stabilization in Aqueous Solutions
US20110287984A1 (en) * 2010-05-21 2011-11-24 Andrey Mirakyan Treatment fluids made of halogenisocyanuric acid and its salts for operations in a well

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