Low density cementitious compositions for use at low and high temperatures

A cement-based and composition technology, applied in the field of cement, can solve the problems of high production cost, prone to rupture density, etc., and achieve the effects of good mixing reaction, low free water, and good rheological properties

Inactive Publication Date: 2018-01-02
HOLCIM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the tendency of these lightweight particles to fracture and increase in density at high pressure, their use is generally limited to low pressure applications
Furthermore, systems with microspheres have high production costs

Method used

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  • Low density cementitious compositions for use at low and high temperatures
  • Low density cementitious compositions for use at low and high temperatures
  • Low density cementitious compositions for use at low and high temperatures

Examples

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Embodiment Construction

[0043] Various aspects of the invention relate to manufactured cement-based adhesives, methods of manufacturing cement-based adhesives, cement-based settable compositions (cement slurries) and methods of cementing. According to embodiments of the present invention, cement-based adhesives and / or cement-based settable compositions may be used in various applications including, for example, underground applications, surface applications, and construction applications. Subterranean applications may include, for example, primary cementing, re-cementing, and drilling operations. In primary cementing, for example, a tubular string such as casing and liner is cemented in the wellbore. Wellbores may include oil wellbores, gas wellbores, water wellbores, geothermal wellbores, and the like. In primary cementing, cement slurry is pumped into the space between the wall of the wellbore and the outer surface of the tubular string disposed therein. placing a cement slurry in the space, ther...

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Abstract

A cementitious binder, includes a hydraulic binder in an amount in the range from 50 to 80% by weight of the cementitious binder; a first siliceous based material in an amount in the range from 0.5 to35% by weight of the cementitious binder, the first siliceous based material having a (SiO2)/(AI2O3) ratio by weight greater than 2.5; a second siliceous based material in an amount in the range from10 to 25% by weight of the cementitious binder, the second siliceous based material being different from the first siliceous based material and having (a) a (SiO2)/(AI2O3) ratio by weight greater than 10 and (b) a BET specific surface area greater than 5m2/g; and an aluminum based material in the range from 0 to 10% by weight of the cementitious binder and having a (SiO2)/(AI2O3) ratio by weightlower than 2.5, wherein 0.09 < AIEFF/( AIEFF+SiEFF) < 0.28, where AIEFF = molar content of alumina in the hydraulic binder, and SiEFF = molar content of silica in the first siliceous based material for particles having a size lower than 3 mu m + molar content of silica in the second siliceous based material.

Description

technical field [0001] The present invention relates to cement, concrete and mortar compositions, and more particularly, the present invention relates to low density cementitious compositions for use at low and high temperatures. The invention also relates to a method of cementing. Background technique [0002] Cement-based settable compositions are used in the preparation and drilling of wellbores extending from the earth's surface into the formation. Typically, the drilling of wells used to recover oil, gas, or water from an earth formation involves placing and securing a casing in the wellbore by injecting cement. In this operation, cement is pumped from the surface down to the bottom of the well and then into the space (the annulus) between the casing and the ground. After the cement slurry (ie, also broadly known as cement-based settable composition) is pumped between the casing and the well, the pumping is stopped and the cement is then allowed to set in place. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C09K8/467C09K8/473E21B33/13C04B111/76
CPCC04B28/04C09K8/473C04B2111/00215C04B2111/40Y02W30/91C04B14/06C04B14/106C04B18/146C04B20/008C04B14/047C04B14/066C04B14/10C04B14/14C04B14/16C04B18/08C04B18/101C04B18/141C04B20/0016C04B38/10C04B2103/10C04B2103/30C04B2103/32C04B2103/40C04B2103/50C04B14/04C04B18/067C04B2201/20C09K8/46E21B33/14
Inventor N·弗拉索普洛斯J·陈
Owner HOLCIM
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