WO2006134355A2 - Additifs generateurs de gaz presentant une duree de vie accrue pour compositions a base de ciment, et procedes associes - Google Patents

Additifs generateurs de gaz presentant une duree de vie accrue pour compositions a base de ciment, et procedes associes Download PDF

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Publication number
WO2006134355A2
WO2006134355A2 PCT/GB2006/002175 GB2006002175W WO2006134355A2 WO 2006134355 A2 WO2006134355 A2 WO 2006134355A2 GB 2006002175 W GB2006002175 W GB 2006002175W WO 2006134355 A2 WO2006134355 A2 WO 2006134355A2
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WO
WIPO (PCT)
Prior art keywords
gas
generating material
sorbitan
cement composition
mixture
Prior art date
Application number
PCT/GB2006/002175
Other languages
English (en)
Other versions
WO2006134355A3 (fr
Inventor
Ashok K. Santra
Rita J. Mckinley
Original Assignee
Halliburton Energy Services, Inc.
Curtis, Philip, Anthony
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
Priority claimed from US11/153,087 external-priority patent/US7473313B2/en
Priority claimed from US11/153,666 external-priority patent/US7334638B2/en
Application filed by Halliburton Energy Services, Inc., Curtis, Philip, Anthony filed Critical Halliburton Energy Services, Inc.
Publication of WO2006134355A2 publication Critical patent/WO2006134355A2/fr
Publication of WO2006134355A3 publication Critical patent/WO2006134355A3/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
    • C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
    • C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
    • C09K8/493—Additives for reducing or preventing gas migration
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1018—Coating or impregnating with organic materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1018—Coating or impregnating with organic materials
    • C04B20/1022—Non-macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents

Definitions

  • the present invention generally relates to cementing, and more particularly to additives for use in cement compositions that have improved shelf lives, wherein the additives are initially formed to comprise a gas-generating material at least partially encapsulated with a coating comprising a fatty acid ester of sorbitan, glycerol, or pentaerythritol and a C 8 -C 18 hydrocarbon.
  • the invention also relates to methods of improving the shelf life of a gas- generating material present in a cement composition by including a C 8 -C 18 hydrocarbon in a mixture used to coat the gas-generating material.
  • Natural resources such as oil and gas residing in a subterranean formation or zone are usually recovered by drilling a wellbore down to the subterranean formation while circulating a drilling fluid in the wellbore.
  • a string of pipe e.g., casing
  • the drilling fluid is then usually circulated downwardly through the interior of the pipe and upwardly through the annulus, which is located between the exterior of the pipe and the walls of the wellbore.
  • primary cementing is typically performed whereby a cement slurry is placed in the annulus and permitted to set into a hard mass (i.e., sheath) to thereby attach the string of pipe to the walls of the wellbore and seal the annulus.
  • secondary cementing operations may also be performed.
  • One example of a secondary cementing operation is squeeze cementing whereby a cement slurry is employed to plug and seal off undesirable flow passages in the cement sheath and/or the casing.
  • Gas migration is caused by the behavior of the cement slurry during a transition phase in which the cement slurry changes from a true hydraulic fluid to a highly viscous mass showing some solid characteristics.
  • the cement slurry acts as a true liquid and thus transmits hydrostatic pressure.
  • certain events occur that cause the cement slurry to lose its ability to transmit hydrostatic pressure.
  • Another event is the development of static gel strength, i.e., stiffness, in the slurry.
  • the pressure exerted on the formation by the cement slurry falls below the pressure of the gas in the formation such that the gas begins to migrate into and through the cement slurry.
  • the gel strength of the cement slurry increases to a value sufficient to resist the pressure exerted by the gas in the formation against the slurry.
  • the flow channels formed in the cement during such gas migration undesirably remain in the cement once it has set. Those flow channels can permit further migration of fluid through the cement.
  • the cement residing in the annulus may be ineffective at maintaining the isolation of the subterranean formation.
  • gas may undesirably leak to the surface or to other subterranean formations.
  • An expensive remedial squeeze cementing operation may be required to prevent such leakage.
  • the gas leakage may further cause high volume blow-outs shortly after cement replacement and before the cement has initially set.
  • cement slurries have been designed that include metal particles such as an aluminum powder for generating a stabilized, dispersed gas.
  • the gas • is often generated in situ in a cement slurry by reacting the metal particles with an alkaline solution, e.g., the cement slurry, and/or water to yield hydrogen.
  • an alkaline solution e.g., the cement slurry, and/or water to yield hydrogen.
  • a sufficient amount of gas is formed in the cement slurry to prevent the migration of gas into or through the slurry before it has sufficiently gelled to resist such migration.
  • the metal particles contained in the cement slurry are usually encapsulated with an inhibitor for delaying the hydrogen-generating reaction until a desired time such as after the slurry has been placed in its desired location in the wellbore, e.g., the annulus.
  • the inhibitor effectively inhibits the particles from interacting and reacting with oxygen, water vapor, and the cement slurry until gas generation is desired.
  • chemical reaction inhibitors commonly used to encapsulate the reactant metal particles, particularly aluminum powder are fatty acids of sorbitan, glycerol, and/or pentaerythritol such as sorbitan monooleate.
  • metal particles coated with such inhibitors suffer from the drawback of undergoing severe sintering when they are not flowable such as when they are being stored.
  • sintering refers to the agglomeration of metal powders at temperatures below the melting point. Such sintering may be facilitated by the non-uniformity of the inhibitor coating, mechanical vibration of the particles such as when they are being transported, the compaction of the particles in a container, and/or the exposure of the particles to relatively high temperatures, air, oxygen, and/or moisture. As a result of such sintering, the metal particles are neither free flowing as before nor properly encapsulated with the inhibitor, making the particles extremely reactive.
  • Gas-generating additives for use in a cement composition comprise: a gas-generating material at least partially encapsulated by a coating comprising a fatty acid ester of sorbitan, glycerol, or pentaerythritol and having a shelf life of about 12 months or greater.
  • the coating may also include a C 8 -C 18 hydrocarbon for increasing the shelf life of the gas-generating material.
  • the Cg-Qs hydrocarbon primarily comprises an aliphatic hydrocarbon.
  • the gas-generating additives may be used in cement compositions to generate gas therein after the compositions have been placed in a wellbore.
  • the coating surrounding the gas-generating material serves to delay the reaction for producing the gas until desired.
  • the gas may serve to inhibit gas migration from an adjacent subterranean formation into and through the cement composition before it sets into a hard mass.
  • methods of increasing a shelf life of a gas- generating material comprise: including a C 8 -C 18 hydrocarbon in a mixture used to coat the gas- generating material.
  • the C 8 -C 18 hydrocarbon primarily comprises an aliphatic hydrocarbon.
  • This gas-generating material may be used in a cement composition to generate gas therein after the composition has been placed in a wellbore.
  • the coating surrounding the gas-generating material serves to delay the reaction for producing the gas until desired.
  • the gas may serve to inhibit gas migration from an adjacent subterranean formation into and through the cement composition before it sets into a hard mass.
  • Coating the gas-generating material can ensure that it can be stored for a relatively long period of time (e.g., up to 1 year or longer) without being concerned that it might experience sintering and thus loose its free flowing nature and react prematurely.
  • the C 8 -C 18 hydrocarbon acts as a thinner to dilute the fatty acid ester of sorbitan, glycerol, or pentaerythritol, thus providing for a more uniform coating of the gas- generating material with the mixture.
  • the C 8 -C 18 hydrocarbon is hydrophobic in nature. Thus, in some embodiments, it may enhance the ability of the coating to protect the gas-generating material from contacting water while it is being stored.
  • the whole mixture may reach temperatures higher than the ambient temperature due to mechanical reasons. Consequently, a portion of the C 8 -C 18 hydrocarbon may evaporate depending upon its vaporization temperature (usually increases with increasing molecular weight i.e., from C 8 to C 18 ) and the temperature reached during coating, leaving the relatively uniform coating of the fatty acid ester of sorbitan, glycerol, or pentaerythritol to protect the gas-generating material.
  • Fig. 1 depicts a side plan view of a drill rig and a wellbore for recovering oil or gas from a subterranean formation penetrated by the wellbore.
  • Gas-generating additives for use in cement compositions include a gas-generating material at least partially encapsulated with a coating comprising one or more fatty acid esters of sorbitan, glycerol, and/or pentaerythritol and initially one or more Cg-C 18 hydrocarbons for increasing the shelf life of the gas-generating material.
  • shelf life is known in the art as meaning the duration for which the gas-generating material can be stored without undergoing any significant changes in either its physical (e.g., its free flowing nature) or chemical properties.
  • the shelf life may be increased to in a range of, for example, from greater than about 6 months to about 12 months. In other embodiments, the shelf life may be increased to 12 months or greater.
  • the coated gas-generating material may be stored without losing its free flowing nature and its ability to generate gas until it is time to prepare the cement compositions. It is understood that during the coating procedure, the temperature of the whole coating mixture may exceed the ambient temperature due to mechanical reasons, e.g., grinding of the gas-generating particles. As a result, at least a portion of the C 8 -C 18 hydrocarbon may evaporate due to its temperature reaching its vaporization temperature (usually increases with increasing molecular weight i.e., from C 8 to C 18 ) or higher during the coating procedure. Thus, only the relatively uniform coating of the fatty acid ester of sorbitan, glycerol, or pentaerythritol may remain to protect the gas-generating material.
  • the gas-generating additives may be included in cement compositions that also comprise cement and fluid.
  • cements Various types of cements are known in the art and may be used in the cement compositions.
  • the cement may be a hydraulic cement composed of calcium, aluminum, silicon, oxygen, and/or sulfur which sets and hardens by reaction with water. Examples of hydraulic cements include but are not limited to Portland cements, pozzolan cements, gypsum cements, high alumina content cements, silica cements, and high alkalinity cements.
  • the cement may be a class A, B, C, G, or H Portland cement.
  • the cement compositions may also include a sufficient amount of fluid to form a pumpable cementitious slurry.
  • suitable fluids include but are not Limited to fresh water or salt water, e.g., an unsaturated aqueous salt solution or a saturated aqueous salt solution such as brine or seawater.
  • the water may be present in the cement compositions in an amount in the range of from about 33% to about 200% by weight of the cement (bwoc), alternatively from about 35% to about 60% bwoc.
  • the gas-generating material is desirably capable of generating gas such as hydrogen (H 2 ) via a chemical reaction.
  • the gas-generating material may comprise one or more metals that react with aqueous alkaline solutions or water to produce hydrogen.
  • suitable metals include but are not limited to aluminum, calcium, zinc, magnesium, lithium, sodium, potassium, and combinations thereof.
  • the hydrogen-generating material is an aluminum powder.
  • suitable commercial aluminum powders include SUPER CBL powder and GAS CHECK powder, both of which are available from Halliburton Energy Services, Inc. (HES).
  • the amount of the gas-generating material included in the cement composition may be selected based on the amount of gas production required to prevent formation gas from migrating from a subterranean formation into the cement composition while it is being placed in a wellbore.
  • the amount of gas- generating material required to yield a specified volume percent of gas in the cement composition increases with pressure. For example, about 0.6 % bwoc of an aluminum powder coated with the mixture described above is required to produce about 5% of hydrogen gas by volume of the cement composition in the case of an American Petroleum Institute (API) casing schedule of 6,000 feet. Further, about 1.10 % bwoc of the coated aluminum powder is required to produce the same volumetric amount of hydrogen gas in the case of an API casing schedule of 14,000 feet.
  • the coating employed to encapsulate the gas-generating material may serve as an inhibitor that delays the release of the gas in the cement composition until a desired time. Otherwise, the reaction of the gas-generating material to produce gas may occur rapidly, causing the gas to be released prior to the desired time, for example, prior to placing the cement composition in the annulus of a wellbore. Moreover, hydrogen gas is highly explosive and thus its generation at inappropriate times may be dangerous.
  • the coating may initially be formed to include from about 3% to about 10%, or alternatively from about 4% to about 5%, of the one or more fatty acid esters of sorbitan, glycerol, and/or pentaerythritol, all percentages being by weight of the gas-generating material. It may further initially include from about 0.25% to about 5%, or alternatively from about 1% to about 2%, of the one or more C 8 -C 1S hydrocarbons, all percentages being by weight of the gas-generating material.
  • Suitable fatty acid esters of sorbitan, glycerol, and/or pentaerythritol include but are not limited to sorbitan monooleate (SMO), sorbitan monoricinoleate, sorbitan monotallate, sorbitan monoisostearate, sorbitan monostearate, sorbitan dioleate, sorbitan trioleate, glycerol monoricinoleate, glycerol monostearate, pentaerythritol monoricinoleate, and combinations thereof.
  • SMO sorbitan monooleate
  • sorbitan monoricinoleate sorbitan monotallate
  • sorbitan monoisostearate sorbitan monostearate
  • sorbitan dioleate sorbitan dioleate
  • sorbitan trioleate glycerol monoricinoleate
  • pentaerythritol monoricinoleate pentaerythritol
  • Cg-C 1S hydrocarbons examples include but are not limited to isoparaffins such as IA-35 synthetic isoparaffin and EXPAR M synthetic isoparafSn, which are commercially available from EXPO Chemical Company, Inc. of Houston, Texas.
  • the inhibitor optionally may also include an anti-oxidant to make the gas-generating material less susceptible to reaction with oxygen (O 2 ). Otherwise, the atoms of the gas- generating material might bond with oxygen atoms to form an oxide, limiting the ability of the gas-generating material to later react with the cement composition and produce gas downhole.
  • the anti-oxidant may be, for example, butylhydroxytoluene (BHT), butylated hydroxyanisole (BHA) and tert-butylhydroquinone (TBHQ).
  • BHT butylhydroxytoluene
  • BHA butylated hydroxyanisole
  • TBHQ tert-butylhydroquinone
  • the amount of the anti-oxidant present in the mixture for coating the gas-generating material may range from about 0.01% to about 2.0% by weight of the gas-generating material, or alternatively from about 0.01% to about 1%.
  • additives may be added to the cement compositions for improving or changing the properties of the cement compositions.
  • suitable additives include but are not limited to fluid loss control agents, weighting agents, de-foamers, dispersing agents, set accelerators, and formation conditioning agents.
  • the gas-generating material may be prepared by first mixing together the components of the inhibitor, followed by coating the gas-generating material with the resulting liquid mixture.
  • the coating of the gas-generating material may be accomplished by mixing it with the liquid mixture such that it is thoroughly contacted and wetted with the mixture.
  • the liquid mixture may be sprayed onto the surface of the gas-generating material.
  • the gas-generating material is entirely, or at least partially, coated with the mixture.
  • the gas-generating material may be ground into a fine powder during this coating procedure.
  • the coated gas-generating material may then be stored either off-site or on-site near where it is to later be used in a cement composition.
  • the coating desirably prevents the gas-generating material from prematurely reacting while it is being stored and, if formed off-site, during its transport to the on-site location.
  • the coated gas-generating material may be dry blended with the cement, followed by mixing the resulting dry blend with water to form a pumpable cement slurry.
  • the coated gas-generating material may be introduced to the mix water before it is combined with the cement to form a cement slurry.
  • FIG. 1 illustrates using a cement composition comprising the coated gas-generating material described herein.
  • An oil rig 40 may be positioned near the surface of the earth 42 for later recovering oil from a subterranean formation (not shown).
  • a wellbore 44 may be drilled in the earth 42 such that it penetrates the subterranean formation.
  • a pipe 52 e.g., a casing, may extend down through wellbore 44 for delivering fluid to and/or from the wellbore.
  • the cement composition may be pumped down through pipe 52 and up through the annulus of wellbore 44 as indicated by arrows 46 using one or more pumps 54.
  • the cement composition may be allowed to set within the annulus, thereby sealing wellbore 44.
  • Any secondary cementing operations known in the art may also be performed using the cement composition. For example, a squeeze cementing technique may be employed to plug permeable areas or voids in the cement sheath or the pipe 52.
  • the inhibitor employed to coat the gas-generating material desirably delays the reaction by which the gas-generating material produces gas, e.g., hydrogen, until the cement composition has been placed in its desired location in the wellbore and before or during a transition time of the cement composition.
  • the placement time of the cement slurry may vary with well depth, hole size, casing size, and placement rate. It is typically in the range of from about 15 minutes to about 300 minutes.
  • the reaction by which it produces hydrogen relies on the alkalinity of the cement composition and generally proceeds according to the following reaction:
  • the particular reaction rate delay that results from coating the gas-generating material with the inhibitor depends on various factors, including the properties of the gas-generating material, the downhole conditions, the composition of the cement composition, and so forth.
  • the reaction rate increases with increasing temperature and decreases with increasing pressure.
  • the reaction may be delayed for an initial time period of from about 15 minutes to about 90 minutes during which the coating either slowly dissolves or the reactants undergo diffusion through the coating.
  • the reaction rate then slowly increases to a peak reaction rate for a period of from about 30 minutes to about 300 minutes.
  • test sample was prepared by coating SUPER CBL aluminum powder with 4% SMO and 2% IA-35 isoparaffin by weight of the SUPER CBL aluminum powder. Its shelf life was accelerated to allow this example to be carried out in a short period of time. That is, the test sample was placed in a plastic cell, and that cell was then placed in a vibrating water bath. Subsequently, air saturated with water vapor was passed through the cell while the bath was
  • test sample survived 5 weeks without becoming very reactive and still remains usable.
  • test sample was prepared by coating SUPER CBL aluminum powder with 4% SMO and 0.5% BHT by weight of the SUPER CBL aluminum powder. It was then tested in the same manner as the test sample in Example 1. This test sample also survived 5 weeks without becoming very reactive and still remains usable.
  • a conventional control sample was prepared by coating SUPER CBL aluminum powder with 4 % SMO by weight of the SUPER CBL aluminum powder. It was then tested in the same manner as the test sample in Example 1. This test sample became too reactive to remain usable after 3 weeks.
  • the typical shelf life of a conventional SUPER CBL aluminum powder coated with 4 % SMO is about 6 months when its aging process is not accelerated.
  • an aluminum powder coated in this manner may serve as a very good gas-generating material in a cement composition.
  • methods of cementing in a wellbore comprise: coating a gas- generating material with a mixture comprising a fatty acid ester of sorbitan, glycerol, or pentaerythritol and a C 8 -CiS hydrocarbon for increasing a shelf life of the gas-generating material; preparing a cement composition comprising the gas-generating material; introducing the cement composition into a wellbore; and allowing the cement composition to set.
  • methods of cementing in a wellbore comprise: coating a gas-generating material with a mixture comprising a fatty acid ester of sorbitan, glycerol, or pentaerythritol and a C 8 -C 18 hydrocarbon, thereby delaying the generation of a gas; preparing a cement composition by combining a cement, a fluid for making the cement composition pumpable, and the gas-generating material; displacing the cement composition into the wellbore; allowing the gas-generating material to generate the gas within the cement composition; and allowing the cement composition to set.
  • gas-generating additives for use in a cement composition comprise: a gas-generating material at least partially encapsulated by a coating comprising a fatty acid ester of sorbitan, glycerol, or pentaerythritol and having a shelf life of about 12 months or greater.
  • cement compositions comprise: a gas- generating material at least partially coated with a mixture comprising a fatty acid ester of sorbitol, glycerol, or pentaerythritol and a C 8 -C 18 hydrocarbon for increasing a shelf life of the gas-generating material.
  • cement compositions comprise: a cement; a fluid for making the cement composition pumpable; a hydrogen-generating material at least partially coated with a mixture for delaying a hydrogen-generating reaction, the mixture comprising sorbitan monooleate and an isoparaffm.
  • the foregoing methods of cementing a wellbore may be applied to various types of wells, including injection wells, single production wells such as oil and gas wells, and multiple completion wells.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Selon divers modes de réalisation, des additifs générateurs de gaz pour composition à base de ciment comprennent une matière génératrice de gaz au moins partiellement revêtue d'un mélange renfermant un ester d'acide gras de sorbitan, du glycérol ou du pentaérythritol et présentant une durée de vie supérieure ou égale à environ 12 mois. Les additifs générateurs de gaz peuvent également comprendre un hydrocarbure C8-C18. Dans d'autres modes de réalisation, des compositions à base de ciment comprennent une matière génératrice de gaz au moins partiellement revêtue d'un mélange renfermant un ester d'acide gras de sorbitan, du glycérol ou du pentaérythritol et un hydrocarbure C8-C18 et permettant d'augmenter la durée de vie de la matière génératrice de gaz. Dans des modes de réalisation supplémentaires, les compositions à base de ciment comprennent un ciment, un liquide destiné à rendre le ciment pompable et une matière génératrice d'hydrogène au moins partiellement revêtue d'un mélange destiné à retarder une réaction de génération d'hydrogène, le mélange renfermant du monooléate de sorbitan et une isoparaffine.
PCT/GB2006/002175 2005-06-15 2006-06-14 Additifs generateurs de gaz presentant une duree de vie accrue pour compositions a base de ciment, et procedes associes WO2006134355A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US11/153,087 2005-06-15
US11/153,087 US7473313B2 (en) 2005-06-15 2005-06-15 Gas-generating additives having improved shelf lives for use in cement compositions
US11/153,666 2005-06-15
US11/153,666 US7334638B2 (en) 2005-06-15 2005-06-15 Methods of improving the shelf life of a cement composition comprising a coated gas-generating material

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WO2006134355A3 WO2006134355A3 (fr) 2007-03-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8689871B2 (en) 2010-11-08 2014-04-08 Schlumberger Technology Corporation Compositions and methods for well completions
US9738822B2 (en) 2013-10-02 2017-08-22 Schlumberger Technology Corporation Compositions and methods for cementing wells

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB299484A (en) * 1927-04-28 1928-10-29 Aerocrete Foreign Ltd Improvements in or relating to the production of porous concrete and similar material
JPH11100279A (ja) * 1997-09-30 1999-04-13 Kawasaki Steel Corp 不定形耐火物用金属粉末とその製造方法
US20040221990A1 (en) * 2003-05-05 2004-11-11 Heathman James F. Methods and compositions for compensating for cement hydration volume reduction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB299484A (en) * 1927-04-28 1928-10-29 Aerocrete Foreign Ltd Improvements in or relating to the production of porous concrete and similar material
JPH11100279A (ja) * 1997-09-30 1999-04-13 Kawasaki Steel Corp 不定形耐火物用金属粉末とその製造方法
US20040221990A1 (en) * 2003-05-05 2004-11-11 Heathman James F. Methods and compositions for compensating for cement hydration volume reduction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8689871B2 (en) 2010-11-08 2014-04-08 Schlumberger Technology Corporation Compositions and methods for well completions
US9738822B2 (en) 2013-10-02 2017-08-22 Schlumberger Technology Corporation Compositions and methods for cementing wells

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