Abstract:
Three pumpable geopolymer compositions for well sealing application is disclosed herein. One pumpable geopolymer composition comprises: (i) less reactive aluminosilicate; (ii) more reactive aluminosilicate; (iii) alkaline silicate activator solution with a very low S1O2/M2O. Another pumpable geopolymer composition comprises: (i) less reactive aluminosilicate; (ii) more reactive aluminosilicate; (iii) alkaline silicate-free activator solution that may contain an alkali salt; and (iv) powdered alkali silicate glass. The third pumpable geopolymer composition comprises (i) less reactive aluminosilicate; (ii) more reactive aluminosilicate; (iii) alkaline low silicate activator solution; and (iv) powdered alkali silicate glass.
Abstract:
Изобретение относится к комплексным полифункциональным добавкам для бетонов, строительных растворов, сухих строительных смесей и цементов. Добавка содержит вулканический пепел в количестве - 25-35%; сухой суперпластификатор на основе полиметиленнафталинсульфоната - 25-35%; сульфат натрия природный (тенардит) - 20-25%, бентонитовую глину - 20-25%. Техническим результатом изобретения является ускорение процесса твердения, повышение прочности, пластифицирующих свойств, связанности, сохраняемости подвижности, снижению расслоения бетонных смесей, обеспечение самозалечивания сквозных трещин (непротекаемость «холодных» стыков), воздухововлечения, повышение морозостойкости, сульфатостойкости, водонепроницаемости, сцепления бетона с арматурой, адгезии бетона, за счет наличия компонентов в добавке при их оптимальном соотношении и получении синергетического эффекта.
Abstract:
A filter aid may include acid-washed diatomaceous earth having high purity, and perlite, A method of making a high purity filter aid may include acid washing diatomaceous earth to reduce the h in the diatomaceous earth, and combining the acid-washed diatomaceous earth with high purity perlite to obtain to obtain a high purity filter aid. A method of reducing extractable metals from diatomaceous earth may include washing the diatomaceous earth in a first acid, rinsing the diatomaceous earth, and washing the diatomaceous earth in a second acid. The first acid may include an inorganic acid having a first strength, and the second acid may include an organic acid having a second strength different than the first strength. A method of filtering a beverage may include passing the beverage through a filter including a filter aid including acid-washed diatomaceous earth having high purity, and perlite.
Abstract:
A method of fracturing a reservoir comprising the steps of pumping a geopolymer precursor fluid through a wellbore into the reservoir at a fracture pressure, the geopolymer precursor fluid at the fracture pressure generates fractures in the reservoir, wherein the geopolymer precursor fluid is comprised of an amount of aluminosilicate, an amount of alkaline reagent, and a permeability enhancer, allowing the geopolymer precursor fluid to fill the fractures in the reservoir, shutting-in the wellbore at a wellbore pressure, the wellbore pressure maintains the geopolymer precursor fluid in the fractures, allowing the geopolymer precursor fluid to harden for a hardening time to form a geopolymer in the fractures, the geopolymer has a geopolymer matrix, the geopolymer matrix has a permeability, the geopolymer has a compressive strength, and reducing the wellbore pressure allows a reservoir fluid to flow from the reservoir through the geopolymer matrix of the geopolymer to the wellbore.
Abstract:
It has been unexpectedly discovered that the addition of a natural or other pozzolan to non-spec fly ash significantly improves the properties of the non-spec fly ash to the extent it can be certified under ASTM C618 and AASHTO 295, as either a Class F or Class C fly ash. The natural pozzolan may be a volcanic ejecta, such as pumice or perlite. Other pozzolans may also be used for this beneficiation process. Many pozzolans are experimentally tested and may be used to beneficiate non-spec fly ash into certifiable Class F fly ash. Additionally, this disclosure provides a method of converting a Class C fly ash to a more valuable Class F fly ash. This discovery will extend diminishing Class F fly ash supplies and turn non-spec fly ash waste streams into valuable, certified fly ash pozzolan which will protect and enhance concrete, mortars and grouts.
Abstract:
A method of conversion of a water-based mud to a gel-based LCM quickly to control lost circulation in a lost circulation zone in a wellbore during continuous drilling with a drilling mud, the drilling mud comprises a volcanic ash, water, a de-foamer, a pH buffer, and a polymer. The method comprises the steps of entering the lost circulation zone, determining a lost circulation volumetric flow rate, metering a first amount of a binder into the drilling mud to create a binder containing mud, pumping the binder containing drilling mud into the wellbore, and suspending metering of the first amount of the binder to the drilling mud after a pre-defined regulating period of time effective to permit the binder containing drilling mud to create a gel-based LCM operable to alter the lost circulation zone.
Abstract:
Vacuum insulation panels (VIPs), their manufacture and utilisation in insulation applications with the VIPs having an insulation panel core composition, comprising (a) 40 to 93 weight (wt) % of fumed silica, silica aerogel or a mixture thereof, (b) 5 to 50 wt % of particles having a specific surface area, determined by the BET method, of less than or equal to 100m 2 /g selected from clay, kaolin, metakaolin, talc fly ash, light weight aggregates, vermiculite, mica, ash, aluminium oxide, alumina trihydrate, waterproofing agents, wollastonite, calcium carbonate, titanium dioxide, metal oxides pigments, colorants, diatomaceous earth and resins, plastic hollow materials, glass and ceramic materials, calcium silicate hydrates, microspheres, volcano ash, shirasu balloons and zeolites, microsilica, geothermal silica, particulate silicon containing materials, aluminium powder, or any combination thereof, (c) 1 to 15 wt % of fibres, (d) 1 to 20 wt % of an opacifier, with the sum of the constituents (a) + (b) + (c) + (d) being 100 wt %.
Abstract:
Cement compositions and methods of their use in subterranean applications are described, specifically the use of a self-degrading cement composition for use in fluid loss applications; a method includes placing a self- degrading cement composition in at least one fracture of a subterranean formation, the self-degrading cement including a cement composition including an acid-base cement, a particulate filler, and a solid acid precursor, the method including allowing the self-degrading cement to set in the fracture.
Abstract:
Es wird eine Baustoffmischung als Betonzusatzstoff offenbart, wobei die Baustoffmischung einen puzzolanischen Träger und einen Photokatalysator enthält. Der puzzolanische Träger und der Photokatalysator liegen als Trockenmischung vor. Es handelt sich um eine zementfreie Trockenmischung, wobei der Photokatalysator eine Primärpartikelgröße zwischen 2 nm und 100 nm aufweist und wobei der puzzolanische Träger zu mindestens 90 Gewichtsprozent aus Flugasche einer Korngröße zwischen 0.1 μm und 1 mm besteht. Der Träger und Photokatalysator liegen intensiv durchmischt vor, so dass der Photokatalysator wenigstens teilweise auf der Oberfläche des Trägers verteilt ist. Die Baustoffmischung verbessert die Verarbeitungsfähigkeit eine Betons gegenüber der Verwendung von anderen puzzolanischen Trägern für den Katalysator.
Abstract:
Verfahren zur Herstellung eines geblähten Granulats aus sandkornförmigem, mineralischem Material (1) mit einem Treibmittel; wobei das Material (1) in einen senkrecht stehenden Ofen (2) aufgegeben wird und in einem Ofenschacht (3) des Ofens (2) entlang einer Fallstrecke (4) durch mehrere Heizzonen (5) fällt, wobei jede Heizzone (5) mit zumindest einem unabhängig steuerbaren Heizelement (6) beheizt werden kann; und das Material (1) dabei auf eine kritische Temperatur erhitzt wird, bei welcher die Oberflächen (7) der Sandkörner (15) plastisch werden und die Sandkörner aufgrund des Treibmittels gebläht werden. Um eine geschlossene Oberfläche des geblähten Granulats gezielt einstellen zu können, ist es erfindungsgemäß vorgesehen, dass bei Detektion einer ersten Verringerung der Temperatur des Materials (1) zwischen zwei aufeinander folgenden Positionen (9) entlang der Fallstrecke (4) die Heizelemente (6) entlang der verbleibenden Fallstrecke (4) in Abhängigkeit von der kritischen Temperatur geregelt werden.