IE920543A1 - Process for dry mixing, in homogeneous form, of cement and¹silica fumes - Google Patents

Process for dry mixing, in homogeneous form, of cement and¹silica fumes

Info

Publication number
IE920543A1
IE920543A1 IE054392A IE920543A IE920543A1 IE 920543 A1 IE920543 A1 IE 920543A1 IE 054392 A IE054392 A IE 054392A IE 920543 A IE920543 A IE 920543A IE 920543 A1 IE920543 A1 IE 920543A1
Authority
IE
Ireland
Prior art keywords
cement
fumes
silica
silica fumes
silo
Prior art date
Application number
IE054392A
Inventor
Jean-Paul Guidoni
Original Assignee
Total Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Total Sa filed Critical Total Sa
Publication of IE920543A1 publication Critical patent/IE920543A1/en

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/02—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing
    • B28C5/06—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing the mixing being effected by the action of a fluid
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/146—Silica fume
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Landscapes

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

Abstract

Process for dry mixing of cement and silica fumes, according to which the silica fumes and the cement are conveyed separately with the aid of separate streams of a carrier gas towards an enclosure in which mixing of the pulverulent products takes place in a known manner by the encounter of the two gas streams. According to the invention the relative humidity of the carrier gas responsible for carrying the silica fumes and that of the gas present in the mixing enclosure is maintained between 0.4 and 0.85 and preferably between 0.5 and 0.8.

Description

PROCESS FOR DRY MIXING, IN HOMOGENEOUS FORM, OF CEMENT AND SILICA FUMES.
The present invention relates to a process for dry mixing, in homogeneous form, of cement and silica fumes. It relates more particularly to the production, by dry mixing, of a composition comprising between 55% and 75% by weight of cement, and between 25% and 45% by weight of silica fumes, and to the use of this composition in cement grouting suitable for the cementation of hydrocarbon-producing wells.
In the sense of the present invention, silica fumes are understood to be the microparticles recovered from the emissions of electric ovens for the fabrication of silicon and its alloys, notably ferrosi1 icons , and in which the silica content is of the order of 85%-98% by weight. These particles' maximum dimension lies between 0.01 micron and micron, with a mean size of some tens of microns, and a specific area between 15 and 25 rP/g, some of which particles may be welded together in small clusters. The apparent density of the silica fumes, whether compacted or not, which may be used within the scope of the present invention lies between 0.1 and 0.7.
The use of these silica fumes, together with a polyamine, notably a polyethylene imine, of cement, of water and the usual cement additives, has been proposed for the production of cement grouting particularly well suited to the cementation of hydrocarbon-producing wells.
US-A-4 482 381 describes the use of such a cement composition as a filtrate reducer, consisting of a polyethylene imine having a molecular mass of 60,000, for the cementation of wells bo&ed in porous ground, at a temperature lower than 38^0 (100°F), or even at a higher temperature if sulphonated polymers are used instead.
Furthermore, in WO-A-90/09357, the applicant and said company: les Ciments d'Origny have proposed the use of a reduced gas-tight cement grout, of the general type mentioned above, but containing a polyethylene imine having a molecular mass between 600,000 and 1,000,000, for the cementation, at temperatures of up to 130”C, of hydrocarbon10 producing wells.
However, incorporating silica fumes in these cement grouts is relatively complicated, because, as described in the two publications mentioned above, it is usually done by the wet method. It is particularly difficult to obtain dry homogeneous mixtures of cement and silica fumes, because of the difference in the apparent densities of the two materials : the apparent density of cement is of the order of 1.5, which is more than double the maximum value for the apparent density of silica fumes (0.7 for compacted fumes), 20 and about 15 times their minimum density (0.1 for uncompacted fumes). The benefits of using silica fumes in cements, in particular an excellent compression resistance, are related to their very fine grain size structure, and it is therefore desirable to be able to use silica fumes which are as fine and hence as light as possible, preferably in uncompacted form, to avoid problems of redispersion in the cement grout .
The present invention aims to remedy this drawback of the recognised method by proposing a process for dry mixing, in homogeneous form, of cemSnt and silica fumes.
Another object of the invention is to propose such a process leading to a homogeneous mixture of cement and silica fumes, which can be used as a cement for producing cement grouts, notably cement grouts for the cementation of hydrocarbon-producing wells.
The applicant has established that to obtain a satisfactory dispersion of silica fumes within the cement, it is necessary to avoid a build-up of static electricity on the silica particles which would cause them to agglomerate, by transporting them and mixing them in the presence of a gas, usually air, with a sufficiently high humidity content to cancel the effect of the static electricity.
Consequently, an object of the invention is a process for dry mixing of cement and silica fumes, whereby the silica fumes and the cement are transported separately, by means of distinct flows of a carrier gas, towards an enclosure where the pulverous products are mixed in a wellknown way by the confluence of the two gaseous flows, which process is characterised in that the relative humidity of the gas carrying the silica fumes and that of the gas present in the mixing enclosure is kept between 0.4 and 0.85, and preferably between 0.5 and 0.8.
The applicant has established that, under these conditions, it is possible to obtain a homogeneous mixture of silica fumes and cement, with appropriate adjustment of the relative outputs of the carrier gases, silica fumes and cement, at the operator discharge of such installations for mixing pulverous products.
Naturally, the relative humidity of the air conveying the silica fumes, whether compacted or not, has to be controlled in such a way as to avoid altering the cement quality by reason of excess humidity.
The temperature at which the process according to the invention is implemented has no effect on the quality of homogeneity of the mixture obtained.
The compositions prepared with this process generally comprise between 55 and 75% of cement and between 25 and 45% of silica fumes.
The use of such cement compositions in the production of cement grouts for the cementation of hydrocarbonproducing wells is another object of the invention.
The mixing installations which can be used in the implementation of the present process are those usually used for mixing pulverous products, such as the one shown in the figure in the attached drawing, which is a schematic diagram of such an installation.
This installation includes a charging bottle 1 for silica fumes, into which bags or containers are emptied, the fumes then being conveyed pneumatically to a silo 2 along the line 3, with the help of an air compressor 4, fitted with a drying system and linked to the charging bottle by a line 5.
The silica fume silo 2 is itself linked by a line 6 to a mixing silo 7. Two silos 8 for storing cement are linked by a line 9 to the line 6 and the cement is conveyed pneumatically towards the mixing silo 7 by means of an air compressor 10, fitted with an air-drying system and connected to silos 8 by a 1-jne 11 , to which the silos 8 are linked by the branches 12.
A homogenisation silo 13 is connected to the mixing silo 7 by a line 14 and is itself linked by a branch 15 to the line 11. This last is linked by a line 16 to the mixing silo 7, and by a line 17 to the silica fume silo 2.
The cement and silica fumes mixture can be discharged either from the mixing silo 7 or the homogenisation silo 13 by the lines 18 and 19 respectively, which are joined together by 20.
An air humidifier 21 is fitted on a bypass of line 5 linking the compressor 4 and the charging bottle 1, linked to the compressor 4 by the line 22 and to the line 5 by a line 23.
The probes 24 and 25 fitted on line 5 facilitate measurement of the humidity content of the air supplied by the compressor before and after humidification by the humidifier 21 respectively.
Valves are fitted on the different lines to allow or prevent circulation of the different flows.
The air flow arriving from the compressor 4 at the bottle 1 must have a relative humidity between 0.5 and 0.8, and if the measurement at probe 24 is too low, a portion of the air will go by the humidifier and the humidity will be measured again by probe 25. If the ambient atmospheric relative humidity exceeds 0.8, compressor 4’s drying system will be used to reduce the humidity content.
To start, silo 2 is filled with a set quantity of silica fumes, which is then conveyed pneumatically towards the mixing silo 7, at the same time as an appropriate quantity of cement from silo 8. The quantity of cement conveyed to the mixing silo 7 is adjusted to the desired proportions, when silo 2 is empty, by means of a balance 26.
When the silo 7 contains the desired quantity of cement and silica fumes mixture, the mixture is homogenised by successive pneumatic transfers, for example three, from silo to silo 13 and back again, by means of the compressed air supplied by compressor 10. The relative humidity of this air must not exceed 0.2, and compressor 10’s drying system can be used to ensure this .
According to one implementation, for example, silo 2 would have a volume of 11.3 mS, while silos 8 would have a volume of 41.77 m^ , and silos 7 and 13 a vo1ume of 23.22 m3 .
Compressor 4 could have a maximum output of 12.3 mJ/min under a pressure of 2.5 bar (2.5 x 10^ Pa), while compressor 10 would have an output of 14 m,5/min under a pressure of 2.5 bar ( 2.5 x 10S Pa ) .
Two examples of implementations of the invention with such an installation are given below.
EXAMPLE 1 A silica fume of apparent density 0.3 g/cm is used, having the following composition, by percentage weight SiOa 92.54 25 AI2.O3 0.65 Fea O3 2.22 CaO 0.11 MgO 1.05 ΚχΟ 0.86 30 so3 0.00 Ti02 0.01 MnO 0.23 Na^O 0.18 Cr 2.Ο3 0.02 35 ΡχΟ5 0.04 ignition loss 2.09 The desired dry mixture is 30% by weight of this silica fume and a class G cement, with specific area 3260 cmx/g and composition as follows, still in percent weight : SiOi 22.01 A120-j 3.15 Fex03 4.97 CaO 65.13 MgO 0.93 ΚχΟ 0.34 SC>3 2.15 TiOx 0.19 MnO 0.08 Nax0 0.12 CnO3 0.01 P3O5 0.08 Silo 2 is filled with 3 tonnes (10m1) of silica fumes, using air of relative humidity between 0.75 and 0.78.
The silica fume is conveyed to silo 7 at the same time as 7 tonnes of cement (46m4), using air of relative humidity between 0.15 and 0.18.
The mixture is homogenised by three successive transfers from silo 7 to silo 13 and back, using air of relative humidity 0.15. tonnes of a perfectly homogenous mixture is obtained, with the following composition, by % weight: SiOx 43.20 Alx0-i 2.38 ΡβχΟτ, 4.15 CaO 46.44 MgO 0.95 KXO 0.49 SOj 1.60 TiOj. 0.12 MnO 0.13 NajO 0.14 Cr^Oj 0.01 Ρι,Ος 0.07 ignition loss 1.20 The whole operation took 66 minutes.
EXAMPLE_2 This time the desired mixture has 40% by weight of a silica fume having an apparent density of 0.487 and a class G cement .
The silica fume has the following composition, by % weight : SiOz AlxOa Fex0-3 CaO MgO 89,92 0.35 3.85 0.63 0.95 10 K2O 0.86 so3 0.01 TiOz 0.00 MnO 0.20 Na^O 0.21 15 CrxOj 0.00 Pi05 0.01 ignition loss 3.00 The cement composition, by % weight, is as follows SiOi 22.20 20 A1 χ 0 j? 3.18 Fe^Oj 5.01 CaO 65.68 MgO 0.94 Kz0 0 34 25 SO-i 2.17 ΤϊΟ^ 0.19 MnO 0.08 Na,_O 0.12 CrLOj 0.01 30 PzO5 0.08 Silo 2 is filled with 5 tonnes (10.26 m3) of a silica fume, using air of relative humidity between 0.68 and 0.77.
This silica fume is transferred to silo 7 at the same time as 7,5 tonnes of cement (4.98 mJ) with air of relative humidity 0.15.
As in Example 1, the mixture is homogenised in three transfers between silo 7 and silo 13 and back, using air of relative humidity 0.15. 12.5 tonnes of mixture is obtained, perfectly homogeneous, of the following composition, by % weight : SiOz 49.65 Ali.03 2.01 Fe-,03 4.51 CaO 39.97 MgO 0.93 KiO 0.55 SO^ 1.28 TiO2 0.11 MnO 0.13 Na 2.0 0.15 Cr403 0.00 Ρς05 0.05 L.0.1 1.71 The whole operation took 75 minutes

Claims (7)

1- Process for dry mixing of cement and silica fumes, according to which the silica fumes and the cement are conveyed separately, by means of distinct flows of a carrier 5 gas, to an enclosure in which the pulverous products are mixed in a well-known way by the confluence of the two gas flows, which process being characterised in that the relative humidity of the carrier gas conveying the silica fumes and that of the gas present in the enclosure is kept between 0.4 and 0.85.
2. A process as claimed in claim 1 wherein the relative humidity is between 0.5 and 0.8.
3. Process as claimed in 1 or 2, characterised in thatthe cement and silica fume flows are such that the resulting homogeneous mixture contains between 55 and 75% cement and between 25 and 45% silica fumes.
4. A process substantially as hereinbefore described with reference to the Examples and drawings.
5. A cement and silica fume mixture whenever prepared by a process as claimed in any preceding claim.
6. Use of cement and silica fume mixtures obtained by the implementation of the process as claimed in any of claims 1 to 4 in the production of cement grout for the cementation of hydrocarbon-producing wells.
7. A use substantially as hereinbefore described with reference to the Examples and drawings.
IE054392A 1991-02-21 1992-02-21 Process for dry mixing, in homogeneous form, of cement and¹silica fumes IE920543A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9102077A FR2673140B1 (en) 1991-02-21 1991-02-21 PROCESS FOR DRY MIXING, IN A HOMOGENEOUS FORM, OF CEMENT AND SILICA FUMES.

Publications (1)

Publication Number Publication Date
IE920543A1 true IE920543A1 (en) 1992-08-26

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ID=9409955

Family Applications (1)

Application Number Title Priority Date Filing Date
IE054392A IE920543A1 (en) 1991-02-21 1992-02-21 Process for dry mixing, in homogeneous form, of cement and¹silica fumes

Country Status (4)

Country Link
EP (1) EP0500402A1 (en)
FR (1) FR2673140B1 (en)
IE (1) IE920543A1 (en)
NO (1) NO920680L (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404588B (en) * 1996-07-19 1998-12-28 Wimberger Franz INSULATION AND METHOD FOR THE PRODUCTION THEREOF
CN110341049A (en) * 2019-06-13 2019-10-18 无锡市华星东方电力环保科技有限公司 A kind of stabilizing fly ash processing system and technique
CN112536920A (en) * 2020-11-16 2021-03-23 葛洲坝石门特种水泥有限公司 Mixing process and mixing equipment in cement compounding

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO148995C (en) * 1979-08-16 1986-06-12 Elkem As PROCEDURE FOR MANUFACTURING CEMENTS LURRY WITH LOW WEIGHT FOR USE BY CEMENTATION OF OIL AND GAS BURNS.
US4804563A (en) * 1986-02-13 1989-02-14 Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann Method and apparatus for the spray placing of concrete layers
NO162848C (en) * 1987-09-11 1990-02-28 Elkem As PROCEDURE FOR ADDING SILICA DUST TO A DRY SPRAYTE CONCRETE MIXTURE.
NO165021B (en) * 1987-11-09 1990-09-03 Norsk Hydro As HYDRAULIC HEAVY WEIGHT CEMENT SUSPENSION SPECIFICALLY USED FOR CEMENTING OF OIL / GAS BURNER AND PROCEDURE FOR THE PREPARATION OF THE SUSPENSION.
GB8904273D0 (en) * 1989-02-24 1989-04-12 Sandoz Ltd Improvements in or relating to chemical compounds
NO167649C (en) * 1989-04-10 1993-07-06 Norske Stats Oljeselskap PROCEDURE FOR THE ADDITION OF SILICIDE OXIDE IN A HYDRAULIC CEMENT SUSPENSION
CH681541A5 (en) * 1990-03-03 1993-04-15 Sandoz Ag

Also Published As

Publication number Publication date
NO920680L (en) 1992-08-24
EP0500402A1 (en) 1992-08-26
NO920680D0 (en) 1992-02-20
FR2673140A1 (en) 1992-08-28
FR2673140B1 (en) 1993-07-16

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