Further, the expected surface area of solid spherical particles of magnesium oxide can be calculated to be between 0.011 m2 /g (for 150 micron diameter particles) and about 0.004 m2 /g (for 420 micron diameter particles), which are substantially less than the measured surface areas in Table 4. The text also states that dead burned magnesias are produced at calcining temperatures above 1400° C., which have crystallite sizes ranging from about 30 micrometers to more than 100 microns in diameter, and which exhibit low chemical reactivities. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SPANGLE, LLOYD B.;REEL/FRAME:004948/0070, Free format text: … Referring to FIG. A method as defined in claim 15 wherein the acid neutralization time of 1 g of the magnesium oxide in 60 ml. Many cements, however, such as Portland Cements, experience a shrinkage upon setting, resulting in a poor mechanical bond between the casing and the bore wall. (2). In order to obtain expansion of the set cement compositions described, in a wellbore, a temperature within the necessary range can be present both during placement and setting of the cement, or only during setting of the cement, or even after setting of the cement. 1, first comparing the results of Trial 1 with those of Trial 4, it will be seen that the same amount of magnesium oxide calcined at 1200° C., after 14 days, produced an expansion at 200° F. (93° C.) which was about 200% greater than that produced by magnesium oxide calcined at 1000° C., and was about 50% greater at 300° F. (149° C.) (149° C.). Cement Grinding Unit; Fly Ash Processing Plant; VSK Cement Plant; Cement Plant Equipment. All expansion measurements were obtained from two different samples, as indicated in Table 5, although expansion measurements were not obtained for all of the magnesium oxide samples other than at 200° F. (93° C. ) with 0.5 wt. An expandable cement composition as defined in claim 5, wherein the magnesium oxide has been calcined at between about 1150° C. and about 1250° C. 7. This latter feature allows magnesium oxide to be produced with particles of the required size and surface area, without the necessity of regrinding the particles. Likewise, it will be seen that the expansions produced after 14 days in Trial 2 (MgO calcined at 1200° C.) are significantly greater than the expansions produced in Trial 4 (MgO calcined at 1000° C.) even though in Trial 2 the magnesium oxide concentration is one-half that present in Trial 4. However, under restrained conditions, the compressive strengths would tend to be higher. % magnesium oxide (BWOC) (Trials 1, 2 and 3, of Table 1 again using 2.5, 1.25, and 3.75 wt. These types of cement have he quality to expand slightly with time. Expansive Cement. To illustrate the foregoing, a cement slurry was prepared using PERMANENTE Class G cement, 35 wt. Various modifications and alterations to the embodiments described above, but which still produce compositions and methods within the scope of this invention, will become apparent to those skilled in the art. Cement, in general, adhesive substances of all kinds, but, in a narrower sense, the binding materials used in building and civil engineering construction. Composition reconstitution of concrete and mortars based on portland and expansive cements 231 aggregates, mortars and concretes with their samples adequately prepared prior to the testing. The linear expansions, and compressive strengths obtained in the set cement compositions, are summarized in Table 7 below. An expandable cement composition as defined in claim 7 wherein the acid neutralization time of 1 g of the magnesium oxide in 60 ml. % (BWOC) magnesium oxide being required. It … It would be desirable then to have a cement composition which would at least not suffer as much from this thermal shock effect. 11, pages 10-13, November, 1973. Ten days after placing of the cement in the well, a bond log was run which showed better than expected casing and wellbore bonding to the cement. 1. The well had a depth of 13,400 feet, a BHST of 210° F. and a bottom hole circulating temperature (BHCT) of 174° F. (80° C.) The magnesium oxide consisted of a uniform blend from all drums numbers 1-75, from which the the samples of Table 5 were taken. Further trials with the same type of cement compositions, were conducted at 200° F. (93° C.) and under a pressure of 3000 psi, using 0.5 wt. The expansions were 0.68 and 0.80% for the initial and final mix specimens, respectively (both from an average of two measurements). of deionized water with 20 ml. An expansive cement containing anhydrous tetra calcium alumino-sulphate, which is burnt simultaneously with a Portland cement composition, or burnt separately, when it is to be interground with Portland cement clinker or blended with Portland cement, calcium sulphate and free lime. Under conditions of restrained expansion, cements such as those of Trial 9, would be expected to exhibit good compressive strengths. As again will be seen from the results of Table 7, 0.5% of the magnesium oxide within the foregoing parameters, can produce a cement with a linear expansion in the desired range of 0.5 to 1.0%, and having a compressive strength of between about 1000 to over 3000 psi. In addition, the magnesium oxide used in each of these Trials was sieved through a series of 6 sieves, and the particle diameter distribution is provided in Table 1A for each sample of magnesium oxide used. for … Magnesium oxide as an expansive additive for construction cementing was also investigated by P. K. Mehta et al. One is designed to expand and compensate for the shrinkage which occurs in conventional portland cement concrete as it hardens. The compressive strength was also measured at 14 days. In the process for making the composites, the concrete is allowed to cure at about 159° C. to 200° C. under 6 to 15 atmospheres pressure. All of the results of the foregoing trials are summarized in Table 7B below. The cement chemical composition influences the type K additive efficacy. Cements of this kind are finely ground powders that, when mixed with water, set to a hard mass.Setting and hardening result from hydration, which is a chemical combination of the cement … This magnesium oxide is capable of producing expansion in set cements when the temperature thereof is at least about 60° C. Preferably the magnesium oxide has been calcined at between about 1100° C. to about 1300° C. for about 1 to about 3 hours, and at least about 80% of the particles are between about 200 microns to about 325 microns. An expandable cement composition as defined in claim 4, wherein 80% of the magnesium oxide particles have a diameter of between about 150 to about 400 microns, and wherein the magnesium oxide particles have a BET surface area of between about 1 and about 2 m. 6. 3. Chemical composition of pozzolana cement is: Silicon Dioxide 21%, Al2O3 2.59%, SO3 2.41 … Furthermore, there is disclosed a method for cementing a casing in a bore of a well, which comprises placing a cement slurry composition of the foregoing type between the casing and the bore. The results in Table 2 generally indicate that where calcining time is the same, the highest linear expansions are obtained at calcining temperatures of 2200° F. (1200° C.) and 2500° F. (142° C.), versus 2800° F. (1540° C.) This appears particularly true when the temperature to which the cement is exposed is 300° F. (149° C.) The foregoing can be observed, for example, from the greater linear expansion obtained in Trial 8 versus Trial 14, Trial 7 versus 13 (at least at 300° F. (149° C.), the results at 200° F. (93° C.) being almost the same), and Trial 12 versus 14. These latter compressive strengths then are horizontally restrained compressive strengths (but not vertically restrained). 1. Regrinding tends to be a process which is inherently difficult to control in terms of size distribution of the magnesium oxide particles. % water (all weight percentages BWOC). % of a lignosulfonate retarder, 0.5 wt. Reference mortar was modified by expa nsive additive at a dosage 10% of weight of cement. It will be noted from Table 1A that the magnesium oxide used in Trials 1 through 3 (see Table 1), which was from a different batch than the MgO used in the trials of Table 2, had a much larger proportion of smaller magnesium oxide particles than did the magnesium oxide for Trial 12, even though the calcining temperature and time was almost identical. If the effect of the expansive agent is expended while the cement is liquid, there will be no net expansion of the set cement. Other articles which generally deal with calcination of magnesium oxide, include "Calcination Studies of Magnesium Oxides" by W. R. Eubank, Journal of the American Ceramic Society, V. 34, No. Expansive Cement Concrete. 12. III, pages v6-v9; P.K. % (BWOC) silica flour, 50% (BWOC) water, and a given wt. In each Trial, the magnesium oxide was sieved to be within the size range indicated. Cement slurries were prepared with the resulting calcined magnesium oxides. In the following trials, the surface area of the magnesium oxide particles, and the ANT were not controlled within the desired specifications given above. The authors considered the use of such expansive agent in cements curing at 32° C. to 54° C., to prevent crack formation. In each case, the cement slurries were poured into molds and the temperature and pressure maintained at 300° F. (149° C.) and 3000 psi, respectively, until all of the expansion measurements made in Table 9 were completed. The composition contains about 3 to 25% by weight of the foregoing magnesium oxide, as well as 10 to 15% of aluminum phosphate, and 50 to 82% inert aggregate, such as sand and gravel. The best particle size range which will produce linear expansions of about 0.5% after 14 days without unduly sacrificing compressive strengths, at least for a cement exposed to a temperature of 200° F., appears from Table 3 to be 150 to 420 microns. Process to separate colour bodies and/or asphalthenic contaminants from a hydrocarbon mixture. The performance of these accelerators depends on the cement chemical composition and fineness, and the presence of mineral additions such as flyash, and blastfurnace slag. Cement Kiln; Cement Rotary Kiln; 0.5mm Tolerance Cement Rotary Kiln; Shaft Kiln; Cyclone Preheater; Precalciner; Rotary Kiln Dryer; Clinker Cooler. Accordingly, the scope of the invention is to be interpreted from the following claims read in light of the foregoing disclosure. Samples calcined at 2800° F. (1583° C.) (used in Trials 13 and 14), were definitely mechanically ground. BETONAMIT® Type S is almost identical in composition but, once mixed, it can be easily formed to fit into holes that have been previously drilled in the rock at various intervals. The dry mix composition consists of particulate magnesium oxide with a surface area of less than about 1 m2 /g, preferably fused or dead burned, at least about 50% of the particles of which pass through a 200 U.S.mesh (referred to herein as "mesh") screen, and 10% of which are held on a 170 mesh or coarser, in many cases up to 35 mesh or coarser screen. A method as defined in claim 16 wherein the magnesium oxide was prepared from magnesium hydroxide as a starting material. Cement: Cement is the mixture of calcareous, siliceous, argillaceous and other substances. Magnesium oxide which was calcined at greater than or equal to 1200° C. was considered to hydrate too slowly. Samples of magnesium oxide from every fifth drum were taken. And the setting and hardening of silicate expansive cement is relatively slow; but that of the … added 1N. The cement system used had the following paramenters: LONE STAR Class H cement, plus 0.5 wt. Shell Internationale Research Maatschappij B.V. 16. A method as defined in claim 13 wherein the magnesium oxide has been prepared by calcining at between about 1100° C. to about 1300° C. for between about 1 to about 3 hours. Expanding cement is made by using a portland cement base composed of kilned limestone, clay and gypsum. So, Finally, our article about “Types of Cement” is reached to an end. Such can occur for example in geothermal wells or wells exposed to heat from fire flooding procedures. However, it will be noted that this is only about one third (1/3) of the amount of magnesium oxide used in Trial 12, Table 2 to produce similar results(in which magnesium oxide, the particle size and surface area were not controlled within the limits already defined). In such a particle size range, the 14 day expansions are increased dramatically over what would be expected, based upon the increased proportion of magnesium oxide present. Anchor fixing agent, anchor fixing agent ampule, and method for fixing anchor, Apparatus for isolating and completing multi-zone frac packs, Process for the recovery and manufacture of valuable byproducts from fractionating sand mine waste products, Fast-setting cements for well abandonment, Magnesium oxide particles, magnesium oxide particle production method, resin composition and molded body using such resin composition, and adhesive or grease, Removable treating plug with run in protected agglomerated granular sealing element, Fracturing tight subterranean formations with a cement composition, Release of expansion agents for well cementing, Ph sensitive encapsulated expansion agent for well cementing, Delayed-expansion cement and cementing operations, Calcined polysiloxane oil encapsulated expansion agent for well cementing, Well cementing slurry comprising particles of expansive agent coated with phenolic resin, method of preparing such a slurry and method of cementing a well, Slurry comprising an encapsulated expansion agent for well cementing, Silica-encapsulated expansion agents for well cementing, Non-aqueous liquid anti-shrinkage cement additives, Well Cementing with Water-Based Liquid Anti-Shrinkage Additives, High density magnesia clinker and process for its production, Method of producing magnesia products from magnesium hydroxide sluidge, expansive mixture for cement conglomerates, Process for producing refractory material, Set-delayed cement compositions comprising pumice and associated methods, Self-healing performance of aged cementitious composites, Masonry repair lime-based mortars: factors affecting the mechanical behavior, Acid-soluble cement compositions comprising cement kiln dust and methods of use, Lime mortars for the conservation of historic buildings, Ceramic spheroids having low density and high crush resistance, Method for making unicellular spherulized clay particles and articles and composition thereof, Cement compositions and methods for high temperature wells containing carbon dioxide, Storable water-microsphere suspensions for use in well cements and methods, Hydration of calcium sulfoaluminate cement at less than 24 h, Delayed thixotropic cement compositions and methods, Cement compositions and their use in oil drilling others or similar, Light weight high temperature well cement compositions and methods, Cementitious compositions containing interground cement clinker and zeolite, Cement compositions with improved fluid loss characteristics and methods of cementing in subterranean formations, Information on inventor provided before grant (corrected). 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Claim 15 wherein the acid neutralization time of 1 G of the cement to... C. ) for 7 and 14 ), of the trials below and throughout this application, unless indicated,... Be between about 0.8 to about 30 minutes DOWELL SCHLUMBERGER INCORPORATED, Free format text: of! With stabilizer format text: ASSIGNMENT of ASSIGNORS INTEREST 2, were obtained resulting in a cement slurry is.