EP0029243B1 - Verfahren zum Reinigen und Desinfizieren der Innenwände von Rohrleitungen - Google Patents

Verfahren zum Reinigen und Desinfizieren der Innenwände von Rohrleitungen Download PDF

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Publication number
EP0029243B1
EP0029243B1 EP80107123A EP80107123A EP0029243B1 EP 0029243 B1 EP0029243 B1 EP 0029243B1 EP 80107123 A EP80107123 A EP 80107123A EP 80107123 A EP80107123 A EP 80107123A EP 0029243 B1 EP0029243 B1 EP 0029243B1
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EP
European Patent Office
Prior art keywords
pig
gelled
pipeline
aqueous
crosslinked
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.)
Expired
Application number
EP80107123A
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English (en)
French (fr)
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EP0029243A1 (de
Inventor
Robert James Purinton, Jr.
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Dow Chemical Co
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Dow Chemical Co
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Filing date
Publication date
Priority claimed from US06/122,536 external-priority patent/US4254559A/en
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Publication of EP0029243A1 publication Critical patent/EP0029243A1/de
Application granted granted Critical
Publication of EP0029243B1 publication Critical patent/EP0029243B1/de
Expired 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 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
    • B08B9/0555—Gelled or degradable pigs

Definitions

  • This invention pertains to a novel method for treating the interior surfaces of pipelines using aqueous, cross-linked gelled pigs.
  • Pipeline efficiency and volume of product being conveyed through the pipeline can be lost by a build-up of scale on the interior surface of the pipe.
  • Mechanical pigs and/or gelled chemical pigs have previously been used to remove scale from the interior surface of a pipe. Mechanical pigs are, normally solid bullet-shaped devices which have wire brushes or abrasive surfaces to physically abrade the scale adhered to the interior surface of the pipe. Gelled chemical pigs, on the other hand, remove surface deposits on the interior surface of a pipe by dissolution and/or by picking up loose debris as they pass through the pipeline.
  • scale also contains bacteria which attack the product to be conveyed by the pipeline.
  • sulfate-reducing bacteria can generate copious quantities of gaseous hydrogen sulfide from certain crude oils, which causes severe corrosion of pipeline walls and also contaminate the product flowing in the line.
  • Hydrogen sulfide is also a noxious, toxic gas which makes it difficult and dangerous to handle from a personnel standpoint and also from a pumping standpoint. Gases in a liquid can cause pumps to cavitate, lose prime, or to function less efficiently.
  • Bacteria are also known to consume hydrocarbons, resulting in a loss of the product.
  • the new method comprises passing an aqueous gel-like mass through the line directly driven by a fluid under pressure, the gel-like mass consisting of an aqueous, cross-linked gelled galactomannan gum, or derivative thereof.
  • aqueous gelled cross-linked pigs used in this invention are superior to other pigs which utilize, for example, polyacrylamides and the like for the gel matrix. This superiority is shown in their shear stability, ease of hydration in water, and the convenience with which the gelled pigs are broken when the job is complete. This facilitates waste disposal and enhances the commercial viability.
  • pipelines can be cleaned and simultaneously sanitized by passing an aqueous gelled pig containing at least on bactericide through the interior of a pipeline.
  • sanitize is meant that the bacteria level of the pipeline surface in contact with the aqueous gelled pig is reduced. Normally, the bacteria level is reduced essentially zero or some other very low value.
  • aqueous gelled pigs of the present invention are easily formulated, are easy to use, and eliminate the need for completely filling a pipeline with an antibacterial solution and thus represent an advancement in the art of pipeline cleaning.
  • the present invention also resides in a method of drying the interior surface of a pipeline by sequentially passing through the pipeline an aqueous cross-linked gelled pig, a fluid mobility buffer comprising a non-crosslinked gelled alkanol of from one to three carbon atoms, and dessicating amount of a liquid alkanol of from one to three carbon atoms.
  • the mobility buffer permits the user to derive the benefits of both the gelled aqueous pigs and a liquid desiccating alkanol.
  • the aqueous-based pig compositions comprise water, a galactomannan gum or derivative thereof as a thickening agent, and a crosslinker.
  • the pig compositions may optionally contain a bactericide as an additive.
  • Other additives may include an abrasive in solid particulate form (e.g. sand) to promote the cleaning ability of the pig as it passes through the pipeline, or other conventional additives which stabilize the pig.
  • Galactomannan gums and derivatives thereof are well known thickeners for water and water- based fluids.
  • examples of such gums include natural gums (e.g. guar gum, locust beam gum, endosperm seed gums, and the like) and derivatives thereof (e.g. hydroxyalkyl galactomannans, carboxyalkyl galactomannans, hydroxyalkyl carboxyalkyl galactomannans, and the like). These are known classes of compounds and essentially any member can be used in the present invention.
  • the most common commeri- cally employed galactomannan gums are guar, hydroxypropyl guar, hydroxyethyl guar, hydroxyethyl carboxymethyl guar, and carboxymethyl guar gums. Because the aforementioned gums are readily commercially available, these gums are preferred thickeners, and of these, guar gum and hydroxypropyl guar gum are the most preferred. It should be noted that in some references the galactomannan gums are referred to as polysaccharide and polysaccharide derivatives. Such thickeners are normally used in amounts of from 4.8 to 18 kg/m 3 (40 to 150 pounds per 1000 gallons) of water (i.e.
  • Aqueous compositions containing the above thickeners are normally cross-linked using a polyvalent metal ion.
  • the cross-linker is normally added as a soluble salt or as a soluble organometallic compound in an amount sufficient to achieve the desired amount of cross-linking.
  • Borates, organotitanates, and organo-zirconium salts are commonly used.
  • the cross-linking ability of such compounds is pH dependent in many instances (e.g. the borate systems). This factor presents a convenient mechanism for dealing with the thickened fluids in a non-crosslinked form until the properties of a cross-linked fluid are desired.
  • the thickened aqueous fluids are normally pumpable at conventional pressures. Substantially elevated pressures are required to pump the fluids in the cross-linked state.
  • the galactomannan gums are cross-linkers are, as noted, known classes of compounds and are disclosed in U.S. Patent Nos. 3,058,909; 3,974,077; 3,818,991; 3,779,914 and 3,696,035. Reference is also made to the disclosure in the text by Davidson and Sittig, “Water-soluble Resins” Second Edition (1968) and the test by Smith and Montgomery, "The Chemistry of Plant Gums and Mucilages", Biograph Series No. 141 (1959).
  • the pig is formulated outside of the pipeline as a pumpable mass and the cross-linker or cross-linker/activator is added to the pumpable mass as it is being pumped into the pipeline.
  • This "on-the-fly" approach has several procedural advantages, not the least of which is ease of placement at convenient low pressures.
  • the pig forms a cross-linked gel network after it enters the pipeline and conforms to the general shape and size of the pipeline.
  • an aqueous pig comprised of a borate cross-linked polysaccharide (or polysaccharide derivative) gel is a preferred pig composition where the pig may be subjected to considerable shear.
  • Such pig formations are conveniently prepared and used by first blending boric acid (from 0.9 to 1.8 kg (2 to 4 pounds)) with an aqueous slurry or solution of the polysaccharide or polysaccharide derivative (from 27 to 36 kg (60 to 80 pounds)) to form a pumpable homogenous mass.
  • Sufficient base e.g. aqueous NaOh
  • the desired quantities of boric acid and polysaccharide or derivative are present per 3.78 m 3 (1000 galons) of water in each instance in the pipeline.
  • the gel-time of these borate-crosslinked systems is easily adjusted by the quantity of base added (cross-linking occurs faster at higher pH values).
  • the gelled pig After the gelled pig has been formed in the pipeline, it is normally driven through the pipeline by the driving force of a fluid under pressure.
  • This fluid may be a gas or a liquid and will vary depending upon the needs of the user. For example, if the user wishes to leave the pipeline in a dry, empty state, one would normally use a dry inert gas such as, for example, nitrogen, carbon dioxide, ethane, propane or liquified petroleum gas. If the user desires to refill the pipeline with a liquid product such as, for example, crude oil or gasoline the pig could be driven with the liquid product, so long as the product does not adversely affect the properties of the pig before its purpose was complete or substantially complete in the pipeline.
  • a fluid under pressure This fluid may be a gas or a liquid and will vary depending upon the needs of the user. For example, if the user wishes to leave the pipeline in a dry, empty state, one would normally use a dry inert gas such as, for example, nitrogen, carbon dioxide, ethane
  • the pigs are formulated and used at ambient temperatures or below and are pumped through the pipelines at pressures sufficient to move the pig at a reasonable rate. Temperatures are therefore normally below about 60°C (140°F). Pressures are normally below about 140.6 kg/cm 2 (2000 psig). The predominant number of pipelines will normally be cleaned at pressure less than 35 kg/cm 2 (5000 psig). Linear flow rates of up to about 91.5 m/min. (5 feet/second) are normally satisfactory, from a commerical cleaning standpoint Rates of from 13.7 to 22.8 m/min. (0.75 to 1.25 ft/sec.) are preferred.
  • the size and shape of the pipeline is basically irrelevant because the gelled pigs are able to be pumped through the pipe over long distances and their shapes will adjust to fit the size of the pipeline during use. This makes the gelled pig extremely effective because stalactites and stalagmites in the pipeline do not cause its destruction by ripping and tearing it apart as they do solid mechanical pigs.
  • the aqueous gelled pigs can be used alone or as an element of a pig train in the pipeline cleaning process. In the latter instance, the aqueous gelled pig is preceded and/or followed by other chemical pig segments or mechanical pigs. Such chemical pig segments could be of the same or different compositions.
  • the pig train could be formed having an aqueous gelled pig according to the instant invention as the leading segment to remove loose scale and other debris from the pipe followed by a bactericide-containing gelled pig for sanitizing the pipe. Accordingly, this combination would be very effective in cleaning as well as sanitizing pipelines. Segments of the pig train could likewise include fluids (liquids or gases) or non-cross- linked gels containing various additives such as corrosion inhibitors, and the like.
  • the aqueous cross-linked gelled pig After the aqueous cross-linked gelled pig has passed through the pipeline, it can be recovered and disposed of as such or "breakers" can be added to the pipeline causing the cross-linked gelled pig to break-up and lose its structure and viscosity. As noted above, this is a very desirable property because it facilitates waste disposal. Additionally, in many instances the aqueous gelled pig is of essentially inconsequential volume relative to the volume of the "product" following it and therefore does not adversely affect the materiai which follows. For example, a few hundred gallons of a pig used according to the instant invention and discharged into the hold of a ship transporting crude oil would not adversely affect the properties of the thousands of gallons of crude oil also present in the tanker.
  • Bactericides which are compatible with water- based formulations are likewise a known class of compounds. Typically such compounds are aldehydes, organic quaternary ammonium compounds or water-soluble salts of halogenated (particularly chlorinated) phenols. Examples of such bactericides include formaldehyde, gluter- aldehyde, dodecyl trimethyl ammonium chloride, and octadecyl tris (2-hydroxyethyl) ammonium chloride. Bactericides that are effective against sulfate-reducing bacteria are particularly useful in the instant invention because of the serious problems such bacteria can create, particularly in oil pipelines. If the particular thickener used is subject to bacterial attack, it may be desirable to also include a bactericide as a preservative for the formulated pig.
  • the fluid mobility buffer of the invention used for drying the interior surface of a pipe comprises a non-crosslinked gelled alkanol of from one to three carbon atoms.
  • Preferred alkanols are methanol, ethanol, and isopropanol. Mixtures of alkanol can be used, if desired.
  • the thickening agent for such alkanols can be galactomannan gums or derivatives thereof but are preferably hydroxy (lower alkyl) celluloses and are more preferably hydroxyethyl or hydroxypropyl cellulose.
  • Such thickeners may be included in the alkanol in substantially any concentration that has the effect of gelling the alkanol and thereby lowering its volatility and enabling the gelled material to be pumped as a viscous slug through the pipeline. Concentrations of from 6 to 24 kg/m 3 (50 to 200 pounds) of thickener per 3.78 m 3 (1000 (gallons) of alkanol are normally used in making the buffer. Sodium hydroxide or other strong base can also be added to the buffer as a viscosity enhancer.
  • the buffer of the present invention separates the aqueous gelled pig from the liquid alkanol and prevents interfacial mixing of these two components which would destroy or substantially reduce the effectiveness of each.
  • the gelled alkanol does not appear to cause degradation of the gelled aqueous pig, such as by dehydration, even though the gelled alkanol has the capacity to take up substantial quantities of water as it passes through the pipeline.
  • the desiccant used for drying the interior surface of a pipe comprises a liquid alkanol of from one to three carbon atoms.
  • Preferred alkanols are methanol, ethanol and isopropanol.
  • the alkanol(s) is used in an amount sufficient to dry the pipeline to the desired degree of dryness, i.e. a desiccating amount.
  • alkanol desiccant and the buffer be the same, but they may be different at the convenience of the user. For example, one would ordinarily prefer to follow gelled methanol with liquid methanol, but it would likewise be satisfactory to follow gelled methanol with ethanol or isopropanol.
  • liquid desiccant with a mechanical swab or with a crosslinked hydrocarbon gel, such as the gelled hydrocarbon pig described in U.S. Patent No. 4,003,393 or an ungelled hydrocarbon pig described in U.S. Patent No. 4,152,289, but the use of an inert gas is also operable.
  • a mechanical swab or with a crosslinked hydrocarbon gel, such as the gelled hydrocarbon pig described in U.S. Patent No. 4,003,393 or an ungelled hydrocarbon pig described in U.S. Patent No. 4,152,289, but the use of an inert gas is also operable.
  • the aqueous cross-linked gelled pig; the buffer, and the desiccant are normally driven through the pipeline by the driving force of a fluid under pressure such as hereinbefore described. If the user desires to refill the pipeline with a liquid product, the "pig train" could be driven with the product so long as there was a satisfactory interface between the product and the alkanol such that the product did not adversely affect the desiccating ability of the alkanol before the job was complete or substantially complete in the pipeline.
  • a 64.4 km (40 mile) pipeline was cleaned by passing through it sequentially (a) 7.6 m 3 (2000 gallons) of a borate cross-linked aqueous gelled pig (pH 8.5-10) having 45.4 kg (100 pounds) of hydroxypropyl guar per 7.6 m 3 (2000 gallons) water, (b) 3.8 m 3 (1000 gallons) fresh water, (c) 60.8 m 3 (16,000 gallons) of 15 percent hydrochloric acid, (d) 30.4 m 3 (8000 gallons) of a commercial passivator and neutralizer, and (e) several polyurethane pigs for gas migration control.
  • Example 1 the pig train was driven through the pipeline at a rate of approximately 0.3 m (1 foot) per second. This is a very satisfactory rate from a commercial standpoint, but rates up to about 1.5 m (5 feet) per second have been used with success.
  • the higher linear velocity trains normally require somewhat longer pigs or pig segments to achieve the same degree of cleaning (thought to be primarily a function of contact time) and to minimize the tendency of pig segments to mix if turbulent flow is encountered.
  • a bactericide-gelled pig The effectiveness of a bactericide-gelled pig was evaluated by passing ten gallons of an aqueous gelled pig containing 250 ppm of a commercial quaternary ammonium bactericide (Dowell M 76) through a 19.5 m (65 foot) test loop of one inch steel and a section of one inch polyvinyl chloride pipeline contaminated with river water laden with bacteria.
  • the gelled pig was driven through the pipeline with fresh water at approximately six inches per second.
  • the gel discharged from the pipeline and the pipeline was flushed with approximately 151 I (40 gallons) of fresh water. Samples were taken from the river water, from the gelled pig, and from the flush water.
  • the gelled pig was prepared by blending 27 kg (60 pounds) of hydroxypropyl guar and 1.35 kg (3 pounds) of boric acid and 250 ppm of the bactericide per 3.78 m 3 (thousand gallons) of water and adjusting the pH of the solution to a pH of from 9-10 with aqueous sodium hydroxide. The system cross- linked as the pH became basic.
  • the pig train was then driven through the line at 0.3-0.6 m (1-2 feet) per second with compressed nitrogen (approximately 6.47 m 3 ; 231 standard cubic feed used).

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Insulated Conductors (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Claims (22)

1. Verfahren zum Reinigen des Inneren einer Rohreitung durch Hindurchfüren einer gelartigen Masse durch die Leitung, die direkt von einem unter Druck stehenden Fluid angetrieben wird, dadurch gekennzeichnet, daß die gelartige Masse aus einem wäßrigen vernetzten, gelierten Galaktommannangummi oder einem Derivat davon besteht.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Galaktomannangummi oder das Derivat davon ein Guargummit oder ein Hydroxypropylguargummit ist.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Galaktomannangummi oder das Derivat davon mit Borat, Organotitanat oder Organozirkoniumionen vernetzt ist.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß der Galaktomannangummi oder das Derivat davon mit Borationen vernetzt ist.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Gummi oder das Derivat davon in dem gelierten Reiniger in einer Menge von wenigstens ca. 5,4 kg/1000 1 (45 pounds per 1000 gallons) Wasser vorhanden ist.
6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der gelierte Reiniger Hydroxypropylguargummi in einer Menge von 5,4 bis 9,6 kg pro 1000 I (45 bis 80 pounds per 1000 gallons) Wasser enthält vernetzt mit Borationen und bei einem pH von 8,5 bis 10,5 gepuffert.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß in dem wäßrigen gelierten Reiniger mindestens ein Bakterizid enthalten ist in einer Menge, die ausreicht, um Bakterien innerhalb der Rohrleitungen stark zu verringern orderzu eliminieren.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß das Bakterizid wirksam ist gegen sulfatreduzierende Bakterien und ausgewählt ist aus Aldehyden, organischen quaternären Ammoniumverbindungen oder wasserlöslichen Salzen von halogenierten Phenolen.
9. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß das Bakterizid ausgewählt ist aus Formaldehyd, Glutaraldehyd, Dodecyltrimethylammonium oder Octadecyltris (2-hydroxyäthyl)-ammoniumchlorid.
10. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der gelierte Reiniger durch die Rohrleitung bei einem Treibdruck von bis zu ca. 140,6 kg/cm2 mit einer Geschwindigkeit von bis zu ca. 91,5 m/min hindurchgeführt wird.
11. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die rohrleitung und ihr Inhalt bei Temperaturen von bis zu ca. 60°C sind.
12. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß die Rohrleitung und ihr Inhalt bei ca. Raumtemperatur sind.
13. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß der wäßrige gelierte Reiniger durch die Rohrleitung mit einer Geschwindigkeit von ca. 13,7 bis ca. 22,8 m/min hindurchgeführt wird.
14. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der wäßrige gelierte Reiniger wenigstens ein Element einer Reinigerkette ist, die eine Vielzahl chemischer Reinigerelemente besitzt.
15. Verfahren nach Anspruch 14, dadurch gekennzeichnet, daß wenigstens das vorderste Element der Reinigungskette der wäßrige gelierte Reiniger ist.
16. Verfahen nach Anspruch 14, dadurch gekennzeichnet, daß mindestens einem der wäßrigen gelierten Reinigerelemente ein wäßriges Gel oder eine wäßrige Flüssigkeit vorausgeht und/oder folgt.
17. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß es die Stufen der aufeinanderfolgenden Hindurchführung durch Rohrleitung enthält:
(a) eines vernetzten gelierten Reinigers,
(b) eines fluiden Mobilitätspuffers, der ein nicht vernetztes geliertes Alkanol mit einem bis drei Kohlenstoffatomen enthält, und
(c) einer trockenden Menge eines flüssigen Alkanols mit 1 bis 3 Kohlenstoffatomen.
18. Verfahren nach Anspruch 17, dadurch gekennzeichnet, daß (b) ein mit Hydroxyäthyl-oder Hydroxypropylzellulose verdicktes Alkanol ist.
19. Verfahren nach Anspruch 17 oder 18, dadurch gekennzeichnet, daß (c) Methanol, Äthanol oder Isopropanol ist.
20. Verfahren nach Anspruch 17, dadurch gekennzeichnet, daß das Alkanol in (b) und in (c) in jedem Fall das gleiche ist und Methanol, Äthanol oder Isopropanol ist.
21. Verfahren nach Anspruch 17, dadurch gekennzeichnet, daß
(a) ein wäßriger vernetzter gelierter Reiniger ist, der einen wäßrigen gelierten Guargummi oder Hydroxypropylguargummi enthält, vernetzt mit Borat, Titanat oder Zirkoniumionen,
(b) ein fluider Mobilitätspuffer ist, der Methanol, Äthanol oder Isopropanol enthält, eingedickt mit Hydroxypropylzellulose, und
(c) Methanol, Äthanol oder Isopropanol ist.
22. Verfahren nach Anspruch 21, dadurch gekennzeichnet, daß (a) ein mit Borationen vernetzter Hydroxypropylguargummi ist, (b) ein mit Hydroxypropylzellulose verdicktes Methanol ist, und (c) Methanol ist.
EP80107123A 1979-11-20 1980-11-17 Verfahren zum Reinigen und Desinfizieren der Innenwände von Rohrleitungen Expired EP0029243B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US9610679A 1979-11-20 1979-11-20
US10678479A 1979-12-26 1979-12-26
US106784 1979-12-26
US06/122,536 US4254559A (en) 1980-02-19 1980-02-19 Method for drying pipelines
US122536 1980-02-19
US96106 1987-09-11

Publications (2)

Publication Number Publication Date
EP0029243A1 EP0029243A1 (de) 1981-05-27
EP0029243B1 true EP0029243B1 (de) 1985-05-22

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Application Number Title Priority Date Filing Date
EP80107123A Expired EP0029243B1 (de) 1979-11-20 1980-11-17 Verfahren zum Reinigen und Desinfizieren der Innenwände von Rohrleitungen

Country Status (4)

Country Link
EP (1) EP0029243B1 (de)
CA (1) CA1145902A (de)
DE (1) DE3070680D1 (de)
NO (1) NO157744C (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4416703A (en) * 1981-11-20 1983-11-22 Shell Oil Company System for removing debris from pipelines
GB2167078B (en) * 1984-11-14 1988-04-13 Schlumberger Cie Dowell Method and composition for the treatment of pipelines
DE69013059D1 (de) * 1989-06-06 1994-11-10 Pumptech Nv Verfahren und Vorrichtung zum zeitweiligen Abdichten von Rohrleitungen.
GB0113006D0 (en) * 2001-05-30 2001-07-18 Psl Technology Ltd Intelligent pig
DE10206989A1 (de) 2002-02-19 2003-08-21 Basf Ag Verfahren zur Herstellung von Phthalsäureanhydrid
CO6170073A1 (es) * 2008-12-12 2010-06-18 Ecopetrol Sa Proceso en linea para la produccion de un gel separador de interfase y limpiador de tuberias
GB2580986A (en) * 2019-02-04 2020-08-05 Aubin Ltd Method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003393A (en) * 1973-02-14 1977-01-18 The Dow Chemical Company Gel-like composition for use as a pig in a pipeline
US4216026A (en) * 1979-02-05 1980-08-05 Shell Oil Company System for removing fluid and debris from pipelines

Also Published As

Publication number Publication date
EP0029243A1 (de) 1981-05-27
NO157744B (no) 1988-02-01
NO803492L (no) 1981-05-21
CA1145902A (en) 1983-05-10
DE3070680D1 (en) 1985-06-27
NO157744C (no) 1988-05-11

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