WO2023182180A1 - Composition de cimentation contenant des particules de silice contenant des atomes d'aluminium et procédé de cimentation - Google Patents

Composition de cimentation contenant des particules de silice contenant des atomes d'aluminium et procédé de cimentation Download PDF

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WO2023182180A1
WO2023182180A1 PCT/JP2023/010444 JP2023010444W WO2023182180A1 WO 2023182180 A1 WO2023182180 A1 WO 2023182180A1 JP 2023010444 W JP2023010444 W JP 2023010444W WO 2023182180 A1 WO2023182180 A1 WO 2023182180A1
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cement
cementing
cementing composition
silica particles
silica
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English (en)
Japanese (ja)
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純平 古野
智 村上
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日産化学株式会社
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/12—Acids or salts thereof containing halogen in the anion
    • 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
    • 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
    • C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss

Definitions

  • the present invention provides an excellent cement slurry (cementing composition) for cementing used during field well drilling in oil and gas fields in high temperature and high pressure environments by suppressing the generation of free water from the slurry.
  • cementing composition cementing composition
  • the present invention relates to a cementing composition that achieves fluidity.
  • cementing pipes When drilling wells in oil fields, gas fields, etc., when finishing the well, casing pipes are used to fix and reinforce the casing pipe inserted into the well as an inner frame, to prevent corrosion, and to prevent groundwater from flowing into the well. Cementing work is performed in which cement slurry is injected into a gap (an annular gap: sometimes referred to as an annulus) between the ground layer (pit wall). Cementing refers to the application of a cement slurry made of cement and water or dissolved water containing additives to various locations within a wellbore or inside or outside the casing, and is divided into primary and secondary cementing.
  • primary cementing refers to cementing in which the casing annulus (outside) is filled with cement after the casing has been lowered, and is always performed in normal casing.
  • secondary cementing refers to subsequent secondary cementing, and refers to cementing that is locally performed as necessary.
  • cement slurry for cementing is designed according to the well conditions described above, and in addition to cement and water, it contains cement fast hardening agent, cement slow hardening agent, low specific gravity aggregate, high specific gravity aggregate, cement dispersant, cement It is prepared by adding additives such as dehydration regulators, cement strength stabilizers, and sludge prevention agents.
  • the cement used for cementing also referred to as oil well cement, geothermal well cement, etc.
  • API standards (petroleum standards established by the American Petroleum Institute) take these required performances into consideration, and various oil well cements are defined by class and sulfate resistance.
  • Class G cement is It is the most used cement for oil well drilling.
  • the amount of free water generated from cement slurry increases in environments where salt water such as seawater is used, or in environments with high temperatures and pressures, and as a result, the fluidity of cement slurry deteriorates.
  • cement strength is impaired, and there is a need for a means that can suppress the generation of free water even under the above-mentioned well environment.
  • the specific surface area value (BET (N 2 )) due to nitrogen adsorption is 10 to 500 m 2 /g
  • the specific surface area value (BET (H 2 )) due to water vapor adsorption is 10 to 500 m 2 /g.
  • a cementing composition containing silica particles having an O)) of 5 to 65 m 2 /g has been disclosed (see Patent Document 1).
  • a seawater-blended mortar in which cement, seawater, aggregate, and a mortar admixture having a specific composition are mixed is disclosed. (See Patent Document 2).
  • An object of the present invention is to provide a cementing composition that can be used in oil fields and gas fields and can suppress the generation of free water from cement slurry even in high-temperature environments of 100°C or higher, particularly 150°C or higher. Furthermore, when salt water is used when kneading the cementing composition, sufficient fluidity is ensured until it reaches the filling point underground, and the generation of free water is suppressed, resulting in sufficient stability.
  • An object of the present invention is to provide a cementing composition that has the following properties.
  • a first aspect of the present invention is a salt water kneading cementing composition for use in oil fields and gas oil fields, comprising cement, silica particles, and salt water, wherein the silica particles have aluminum atoms relative to the mass of silica (SiO 2 ).
  • the above cementing composition which is silica particles contained in a proportion of 0.1 to 4.0% by mass in terms of Al 2 O 3 ;
  • the cementing composition according to the first aspect wherein the silica particles are particles having a specific surface area diameter (equivalent spherical particle diameter) of 5 to 200 nm as measured by a nitrogen gas adsorption method;
  • the cementing composition according to the first aspect or the second aspect wherein the salt water is an aqueous solution containing 0.1 to 4.0% by mass of salt;
  • the ratio expressed by (average particle diameter by dynamic light scattering method)/(average particle diameter by dynamic light scattering method of silica particles before the test) is 1.0 to 100.
  • the cementing composition according to any one of the first to fifth aspects, as a seventh aspect, it further includes a cement retardant and other additives, and the silica particles are added to the cement at a ratio of 0.01% to 10% BWOC as a silica solid content, and the salt water is added to the cement in an amount of 30 to 60%.
  • the other additives are at least selected from the group consisting of dehydration regulators, antifoaming agents, quick hardening agents, low specific gravity aggregates, high specific gravity aggregates, cement dispersants, cement strength stabilizers, and sludge prevention agents.
  • the cementing composition according to any one of the first to fifth aspects which is one type of additive;
  • the eighth aspect is that in drilling oil or gas fields, when extracting oil or gas from a high temperature and high pressure environment of 100°C or more and 300°C or less, it is necessary to fill the void between the geological formation and the casing pipe with oil well cement.
  • a cementing construction method characterized in that the cementing composition according to any one of the first to seventh aspects is used as a cementing material, and as a ninth aspect, a cementing method according to any one of the first to seventh aspects.
  • a cementing method comprising the steps of introducing the cementing composition described in 1. into a wellbore, and coagulating the cementing composition.
  • cementing composition of the present invention When the cementing composition of the present invention is used during drilling in a high-temperature oil layer of 100°C or higher, particularly 150°C or higher and 300°C or lower, free water is generated from the cementing composition (cement slurry for cementing), which causes a decrease in strength. It is a composition that can suppress the occurrence of problems, and also achieves excellent fluidity when salt water (especially seawater) is used at the site. casing, resulting in insufficient fixation of the casing). Therefore, by using the cementing composition of the present invention, it is possible to stably finish a wellbore and carry out cementing with high productivity even in a high-temperature environment.
  • the present invention is directed to a salt water kneading cementing composition for use in oil and gas fields, comprising cement, silica particles, and salt water.
  • a salt water kneading cementing composition for use in oil and gas fields, comprising cement, silica particles, and salt water.
  • the silica particles used in the present invention are silica particles containing aluminum atoms in an amount of 0.1 to 4.0% by mass in terms of Al 2 O 3 based on silica (SiO 2 ) (mass), and preferably contain aluminum atoms. These are silica particles containing atoms in an amount of 0.1 to 2.0% by mass, more preferably 0.1 to 1.5% by mass.
  • the form in which aluminum atoms are contained is not particularly limited, and may be chemically bonded to silica or silicon atoms, or may form a solid solution at the atomic level.
  • Silica particles derived from an aqueous silica sol can be used as the silica particles contained in the cementing composition of the present invention, and can be added in the form of an aqueous silica sol as a component of the cementing composition.
  • Aqueous silica sol refers to a colloidal dispersion system in which an aqueous solvent is used as a dispersion medium and colloidal silica particles are used as a dispersoid, and it can be produced by a known method using an aqueous alkali silicate solution such as water glass (aqueous sodium silicate solution) as a raw material. can.
  • aqueous silica sol When producing aqueous silica sol using water glass (sodium silicate aqueous solution) as a raw material, active silicic acid is produced by cation exchange of water glass, and a polymer of silicic acid is formed by heating the active silicic acid.
  • An aqueous silica sol can be obtained by growing the silica particles into silica particles in an aqueous medium.
  • silica particles containing aluminum atoms are formed by adding a compound containing aluminum atoms at the stage where activated silicic acid is obtained or the silica particles are formed.
  • an alkali aluminate eg, sodium aluminate
  • an alkali aluminate can be used as the compound containing an aluminum atom.
  • silica particles containing aluminum atoms are dispersed by adding an aqueous alkali aluminate solution to an aqueous activated silicic acid solution or adding an aqueous alkali aluminate solution to a silica sol and heating the resulting mixture.
  • silica sol can be obtained. It is thought that the silica particles (aqueous silica sol) obtained by such a method form an aluminosilicate structure in which some of the silicon in the silica network is replaced with aluminum atoms. Since the aluminum atoms have a positive charge and give a positive charge to the silica particles, the silica particles do not aggregate and disperse even in a medium containing many ionic components such as salt water. It is thought that the particles are highly stable.
  • the silica (SiO 2 ) concentration in the aqueous silica sol used as silica particles in the present invention is not particularly limited, but can be, for example, 5 to 55% by mass.
  • the average particle diameter of the silica particles used in the present invention is represented by the specific surface area diameter (equivalent spherical particle diameter calculated from BET (N 2 )) obtained by measurement by a nitrogen gas adsorption method. Moreover, the average particle diameter of silica particles can also be expressed by the particle diameter determined by dynamic light scattering method (DLS method).
  • DLS method dynamic light scattering method
  • the particle size determined by the above dynamic light scattering method (hereinafter referred to as the DLS average particle size) represents the average value of the secondary particle size (dispersed particle size), and represents the average value of the secondary particle size (dispersed particle size).
  • the DLS average particle size is said to be about twice the average particle size (specific surface area diameter obtained by measurement by nitrogen gas adsorption method (BET method), which represents the average value of primary particle diameter).
  • BET method nitrogen gas adsorption method
  • the specific surface area diameter (equivalent spherical particle diameter calculated from BET (N 2 )) of the silica particles used in the present invention is preferably 5 to 200 nm, for example 10 to 100 nm, 10 to 80 nm, or 10 to 70 nm. It can be done.
  • the particle diameter of the silica particles used in the present invention as measured by a dynamic light scattering method is preferably 10 to 200 nm, and can be, for example, 10 to 100 nm, 10 to 80 nm, or 10 to 70 nm.
  • the silica particles used in the present invention have a rate of change in average particle diameter within a specific range before and after the salt water resistance test shown below.
  • the ratio expressed as (average particle diameter measured by light scattering method)/(average particle diameter measured by dynamic light scattering method of silica particles before the test) is 1.0 to 100, preferably 1.0 to 50, or 1.0 to 100, preferably 1.0 to 50.
  • silica particles having a particle size of 0 to 30, or 1.0 to 10, or 1.0 to 5.0, more preferably 1.0 to 2.0.
  • Silica particles with a small rate of change in particle size before and after the salt water resistance test not only have excellent fluidity but also can suppress the amount of free water in a cementing composition to which they are added.
  • the cementing composition (cement slurry for cementing) of the present invention contains cement, silica particles, and salt water as described above.
  • the cement used in the present invention is preferably oil well cement.
  • the cementing composition of the present invention contains silica particles (for example, in the form of an aqueous sol) relative to the cement, with a silica solid content of 0.1% to 10% BWOC (BWOC is the dry solid content of cement). By Weight of Cement).
  • the cementing composition of the present invention may contain, in addition to the cement, silica particles (aqueous silica sol), and salt water, a cement retardant and other additives.
  • silica particles aqueous silica sol
  • salt water a cement retardant and other additives.
  • the blending amounts of each component are as follows: the silica particles are 0.01% to 10% BWOC as silica solid content, the salt water is 30% to 60% BWOC, and the cement retardant is added to the cement. can be blended in a proportion of 0.1 to 5% BWOC, and other additives can be blended in a proportion of 0.001 to 10% BWOC.
  • the other additives may be selected from the group consisting of dehydration regulators, antifoaming agents, quick hardening agents, low specific gravity aggregates, high specific gravity aggregates, cement dispersants, cement strength stabilizers, and sludge prevention agents. At least one type of additive can be mentioned.
  • the cement used in the present invention is preferably an oil well cement as described above, and the oil well cement conforms to the API (American Petroleum Institute) standard "APISPEC 10A Specification for Cements and “Materials for Well” Class A Cement ⁇ Class Any H cement can be used.
  • class G cement and class H cement are more preferable because they can be easily adjusted with additives and can be used at a wide range of depths and temperatures.
  • cement retardant is used to maintain proper fluidity of the cementing composition until the end of the work and to adjust the thickening time.
  • Cement retardants contain lignin sulfonates, naphthalene sulfonates, borates, etc. as main components.
  • the dehydration regulator can be used for the purpose of protecting geological formations that are sensitive to water and preventing early dehydration of slurry (cementing composition), and contains organic polymers and vinylamide vinylsulfonic acid copolymers as main components. Including etc.
  • the antifoaming agent contains a silicone compound, a higher alcohol, etc. as a main component.
  • the low specific gravity aggregate can be used for the purpose of lowering the specific gravity of the cementing composition when there is a water loss layer or a low pressure layer, and contains bentonite, gilsonite, diatomaceous earth, perlite, and fly ash hollow particles as main components. , alumina silicate glass hollow particles, sodium borosilicate hollow particles, alumina hollow particles, or carbon hollow particles.
  • the high specific gravity aggregate can be used for the purpose of increasing the specific gravity of the cementing composition in order to improve the replacement efficiency with the high-pressure layer suppressed mud water, and contains barium sulfate, hematite, ilmenite, etc. as the main component. include.
  • the cement dispersant can be used for the purpose of lowering the viscosity of the cementing composition and increasing the muddy water replacement efficiency, and contains naphthalene sulfonic acid formalin condensate, polyacrylic acid condensate, or polyacrylic acid condensate as the main component. Contains sulfonated melamine condensates, etc.
  • the cement strength stabilizer contains fly ash, silica powder, etc. as main components.
  • the anti-sludge agent is used to prevent sludge, and specifically includes inert granular materials that do not affect the properties of cement.
  • the main ingredients include walnut shell, vermiculite, gilsonite, mica, and cellophane. Including scraps, etc.
  • the (cement) quick hardening agent is used for the purpose of shortening initial strength and hardening waiting time, and contains calcium chloride, water glass, gypsum, etc. as main components.
  • the cementing composition of the present invention also contains various additives used in cement compositions for general structures and concrete compositions. It may contain cement, aggregate, and other additives used in these cement compositions.
  • conventional general structural cements include portland cement (for example, ordinary portland cement, early strength portland cement, ultra early strength portland cement, low heat/moderate heat portland cement, sulfate resistant portland cement, etc.), various mixed cements (blast furnace cement, silica cement, fly ash cement, etc.), white Portland cement, alumina cement, super fast hardening cement (1 clinker fast hardening cement, 2 clinker fast hardening cement, magnesium phosphate cement), cement for grout, low heat generation cement (low heat buildup) type blast furnace cement, fly ash mixed low heat generation blast furnace cement, high Belite content cement), ultra-high strength cement, cement solidifying agent, ecocement (manufactured using one or more types of municipal waste incineration ash, sewage sludge incineration ash) Furthermore, fine powders such as blast furnace slag, fly ash, cinder ash, clinker ash, husk ash, silica fume, silica powder, limestone
  • cementing compositions for general structures mentioned above include high-performance AE water-reducing agents, high-performance water-reducing agents, AE water-reducing agents, water-reducing agents, air-entraining agents (AE agents), foaming agents, and separation agents.
  • AE agents air-entraining agents
  • foaming agents and separation agents.
  • cement/concrete additives such as reducing agents, thickening agents, shrinkage reducing agents, curing agents, water repellents, etc. can be mentioned, and these can also be blended into the cementing composition of the present invention.
  • salt water used in the cementing composition of the present invention for example, an aqueous solution containing 0.1 to 4.0% by mass of salt can be used.
  • salt water for example, salt-containing land water or sea water can be used.
  • seawater contains 96.5 to 97% by mass of water and salt, and the salt contains sodium ions, magnesium ions, calcium ions, potassium ions, etc. as alkali metal ions, and chloride ions, sulfate ions, etc. as anions. things can be used.
  • These salts include, for example, 78% by mass of sodium chloride, 9.6% by mass of magnesium chloride, 6.0% by mass of magnesium sulfate, 4.0% by mass of calcium sulfate, 2.0% by mass of potassium chloride, etc. may be included in the
  • the present invention also targets a cementing method using the above-mentioned cementing composition.
  • the cementing method of the present invention is used to remove the void between the stratum and the casing pipe when extracting oil or gas from a high temperature and high pressure environment of 100°C or higher, particularly 150°C or higher and 300°C or lower, in the excavation of an oil or gas field. It is characterized in that the above-described cementing composition according to the present invention is used as a cementing material for filling with oil well cement.
  • the present invention is also directed to a cementing method comprising the steps of introducing a cementing composition as described above into a wellbore and allowing said cementing composition to set.
  • the cementing composition containing silica particles according to the present invention has excellent fluidity until it reaches the construction site when the composition is used in an environment of 100°C or higher, particularly 150°C or higher and 300°C or lower. It has high stability by suppressing agglomeration and syneresis, and it can be expected that a cured product with high hardness will be obtained by curing after reaching the construction site.
  • the silica solid content concentration After removing the alkali content of the aqueous silica sol using a hydrogen-type cation exchange resin, the silica solid content concentration was determined from the residue after drying at 1000°C. As will be described later, the "silica solid content" of this "silica solid content concentration" includes not only silica (SiO 2 ) but also aluminum atoms and sodium atoms contained in the silica particles of the aqueous silica sol.
  • DLS average particle diameter Average particle diameter determined by dynamic light scattering method
  • DLS average particle diameter DLS particle diameter
  • Zetersizer Nano manufactured by Spectris Corporation, Malvern Division
  • Specific surface area diameter determined by BET method also referred to as average primary particle diameter determined by BET method, BET particle diameter
  • the sol was dried at 290°C and used as a measurement sample.
  • Monosorb manufactured by Quantachrome Instruments Japan LLC
  • BET method nitrogen gas adsorption method
  • Al 2 O 3 /SiO 2 mass ratio of silica particles After dissolving the aqueous silica sol in an aqueous nitric acid solution, the amount of Na 2 O was measured using an atomic absorption spectrophotometer (manufactured by Shimadzu Corporation), and the amount of Al 2 O was measured using an ICP emission spectrometer (manufactured by PerkinElmer Corporation). Each was measured at The amount of SiO 2 was determined by calculating the silica solid content from the above-mentioned silica solid content concentration, and removing the above-mentioned Na 2 O amount and the above-mentioned Al 2 O 3 amount from there. From the obtained SiO 2 amount and Al 2 O 3 amount, the mass ratio (%) of Al 2 O 3 /SiO 2 was calculated by [(Al 2 O 3 amount/SiO 2 amount) ⁇ 100].
  • salt water resistance evaluation (DLS average particle diameter change rate)
  • the aqueous silica sol was diluted with salt water (Marine Art SF-1 artificial seawater for test and research, manufactured by Tomita Pharmaceutical Co., Ltd.) so that the silica solid content concentration was 1.0% by mass, and the salt concentration was 3.6% by mass. This was used as a salt water resistance evaluation sample.
  • a salt water resistance test was carried out by stirring the salt water resistance evaluation sample at 20° C. for 1 hour and storing it at 20° C. for 1 hour.
  • the average particle diameter of the salt water resistance evaluation samples before and after the test was measured by the DLS method, and the rate of change in the average particle diameter of the silica particles in the salt water dispersion by the DLS method was determined by performing the salt water resistance test (after the test). Calculated as (average particle diameter of silica particles measured by dynamic light scattering method)/(average particle diameter of silica particles measured by dynamic light scattering method before the test).
  • Silica Sol C manufactured by Nissan Chemical Co., Ltd.: Specific surface area diameter (average primary particle diameter) 22.1 nm by BET method, silica solid content concentration 40.4% by mass, Al 2 O 3 /SiO 2 mass ratio 0.92% by mass , average particle diameter 40.7 nm by DLS method Silica Sol D manufactured by Nissan Chemical
  • the cementing composition was prepared in accordance with API Standard 10B-2 (petroleum standard established by the American Petroleum Institute) using a dedicated device and the materials and amounts shown in Table 1. That is, salt water (Marine Art SF-1, artificial seawater for test and research use, manufactured by Tomita Pharmaceutical Co., Ltd., salt concentration 3.6% by mass) was put into a special mixer, and while rotating the stirring blade at 4,000 rpm. , a commercially available dehydration regulator, aqueous silica sol A to E, a commercially available retardant and antifoaming agent, class G cement (manufactured by Ube Mitsubishi Cement Co., Ltd.), and silica in the amounts shown in Table 1 for 90 seconds.
  • API Standard 10B-2 petroleum standard established by the American Petroleum Institute
  • a cementing composition ( cement slurry) was prepared.
  • the aqueous silica sol was added so that the surface area amount was 275 m 2 per 1000 g of the cementing composition.
  • a cementing composition to which no aqueous silica sol was added was prepared.
  • the fluidity of the cementing composition was evaluated according to the following procedure, and the amount of free water (free water) was also evaluated in accordance with API standards.
  • Fluidity evaluation of cementing composition 150 cc of the prepared cementing composition was taken out, put into a 300 mL stirring autoclave (manufactured by Pressure Glass Industry Co., Ltd.), heated to 180°C over 1 hour, and then kept at the same temperature for 30 minutes. It was maintained and conditioned (cured at a predetermined temperature). After maintaining the high temperature for 30 minutes, the cementing composition was cooled down to 88°C over 30 minutes, and when the cementing composition was taken out of the apparatus, the amount of fluid, unsolidified cementing composition was confirmed, and the following evaluation criteria were determined. It was evaluated. Note that the amount of unsolidified cementing composition is the volume ratio to the cementing composition charged into the autoclave. ⁇ Fluidity evaluation criteria for cementing compositions ⁇ A: 80% or more of fluid unsolidified cementing composition (most cementing composition maintains fluidity) B: Less than 80% of fluid unsolidified cementing composition (some cementing composition is solidified)
  • Table 1 shows the formulations of the cementing compositions of Examples 1 to 5 and Comparative Example 1
  • Table 2 shows the physical properties of the silica particles of the aqueous silica sols A to E used in Examples 1 to 5
  • Table 3 shows the physical properties of the silica particles of the aqueous silica sols A to E used in Examples 1 to 5.
  • the results of evaluation (fluidity evaluation and measurement of free water amount) of each cementing composition are shown, respectively.
  • the unit of the blending amount of each component in the cementing composition in Table 1 is shown in %BWOC, and in Table 1, "-" indicates that the component is not added.
  • Examples 1 to 2 were carried out using silica sols A to E containing silica particles having an Al 2 O 3 /SiO 2 mass ratio of 0.23% by mass or more and 1.70% by mass or less. All of Example 5 had excellent fluidity and exhibited a free water amount of 2% by volume or less.
  • the Al 2 O 3 /SiO 2 mass ratio in the silica particles according to the present invention is 0.1 to 4.0% by mass, preferably 0.1 to 2.0% by mass, more preferably 0.1 to 1% by mass. It was confirmed that by setting the amount to .5% by mass, it is possible to reduce the amount of free water to less than 1.0% by volume, which is a more preferable embodiment.
  • silica sols A, B, and C were used in which the rate of change expressed by the ratio of the DLS average particle size after the salt water resistance test (storage at 20°C for 1 hour) to the DLS average particle size before the test was less than 2.0.
  • Examples 1, 2, and 3 all had excellent fluidity and exhibited a very small amount of free water of 0.80 to 0.40% by volume.
  • aqueous silica sol is not used (Comparative Example 1), the curing reaction of cement particles or other cement additives proceeds unevenly in a salt water environment and a high temperature environment, resulting in 5.0% by volume of free water. It was confirmed that the composition was unsuitable as a cementing composition.
  • silica particles having an Al 2 O 3 /SiO 2 mass ratio of 0.1 to 4.0 mass% suppresses the generation of free water from cement slurry in salt water environments and high temperature environments. It was confirmed that this cementing composition can be used.
  • An object of the present invention is to provide a cementing composition that can be used in oil fields and gas fields and can suppress the generation of free water from cement slurry even in high-temperature environments of 100°C or higher, particularly 150°C or higher. Even when salt water is used when kneading materials, a stable cementing composition that ensures sufficient fluidity until it reaches the filling point underground and suppresses the generation of free water. provide something.

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  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Le problème décrit par la présente invention est de fournir une composition de cimentation utilisée dans des champs pétrolifères et des champs gaziers, la composition de cimentation étant en mesure de supprimer la génération d'eau libre à partir d'une boue de ciment même dans un environnement à haute température de 100 °C ou plus, en particulier même 150 °C ou plus, garantissant en outre une fluidité suffisante jusqu'à ce qu'un point de remplissage souterrain soit atteint même si de l'eau salée est utilisée lors du malaxage de la composition de cimentation et ayant une stabilité suffisante obtenue par suppression de la génération d'eau libre. La solution proposée est une composition pour cimentation malaxée à l'eau salée utilisée dans des champs pétrolifères et des champs gaziers, la composition contenant du ciment, des particules de silice et de l'eau salée, les particules de silice contenant des atomes d'aluminium dans une proportion de 0,1 à 4,0 % en masse en termes d'Al2O3 par rapport à la masse de silice (SiO2). Dans un mode de réalisation préféré de la composition de cimentation, les particules de silice ont un diamètre de surface spécifique (diamètre de particule calculé pour une sphère équivalente) de 5 à 200 nm tel que mesuré à l'aide d'un procédé d'adsorption d'azote gazeux, l'eau salée est une solution aqueuse contenant 0,1 à 4,0 % en masse de sel et l'eau salée est de l'eau terrestre contenant du sel ou de l'eau de mer.
PCT/JP2023/010444 2022-03-23 2023-03-16 Composition de cimentation contenant des particules de silice contenant des atomes d'aluminium et procédé de cimentation WO2023182180A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4146719B2 (ja) * 2000-06-22 2008-09-10 アクゾ ノーベル エヌ．ブイ． 建築材料
JP2012017215A (ja) * 2010-07-06 2012-01-26 Eiken:Kk 海水配合モルタル
JP2017511779A (ja) * 2014-02-28 2017-04-27 ハリバートン エナジー サヴィシーズ インコーポレイテッド ポゾラン石灰セメント組成物の調整可能な制御
WO2020059213A1 (fr) * 2018-09-18 2020-03-26 日産化学株式会社 Additif à base de silice pour composition de cimentation, composition de cimentation et procédé de cimentation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4146719B2 (ja) * 2000-06-22 2008-09-10 アクゾ ノーベル エヌ．ブイ． 建築材料
JP2012017215A (ja) * 2010-07-06 2012-01-26 Eiken:Kk 海水配合モルタル
JP2017511779A (ja) * 2014-02-28 2017-04-27 ハリバートン エナジー サヴィシーズ インコーポレイテッド ポゾラン石灰セメント組成物の調整可能な制御
WO2020059213A1 (fr) * 2018-09-18 2020-03-26 日産化学株式会社 Additif à base de silice pour composition de cimentation, composition de cimentation et procédé de cimentation

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