摘要:
A cement composition for use in a wellbore comprising a cement blend and at least two polyvinylalcohols wherein the polyvinylalcohols have different degrees of hydrolysis such that the rheology of the cement slurry capable of being formed from the composition is stable during temperatures changes.
摘要:
The use of silicate as a retarder enhancer at appropriate levels to enhance the retarding effect of retarders at high temperatures encountered downhole while accelerating the set of cement at lower temperatures encountered near to the surface.
摘要:
A cement composition for which the mechanical properties of the set cement can be controlled independently of the slurry density, both at high density (>16 ppg) and at low density (
摘要:
A permeable cement composition comprises an aqueous slurry of a hydraulic cement including a water-immiscible dispersed fluid phase, such as oil or gas, and a hollow particulate material, the hollow particulate material being one which breaks down in the presence of the cement so as to leave voids which together with the dispersed phase create a permeable structure in the cement.
摘要:
The invention concerns a novel method for preparing latex by emulsion (co)polymerization of ethylenically unsaturated monomers, wherein the direct inline monitoring is carried out by Raman spectroscopy. The invention also concerns latex compositions obtainable by the emulsion (co) ploymerization method whereof the direct inline monitoring is performed by Raman spectroscopy. The invention further concerns a device for implementing said method, said device comprising a reactor, at least an optical probe, a Raman spectrometer, optical fibers, a computer and a regulating automaton.
摘要:
The invention relates to a cement slurry for cementing an oil well or the like, the slurry having a density lying in the range 0.9 g/cm3 to 1.3 g/cm3, and being constituted by a solid fraction and a liquid fraction, having porosity (volume ratio of liquid fraction over solid fraction) lying in the range 38% to 50%. The solid fraction is constitued by a mixture of lightweight particles, microcement and optionally portland cement and gypsum. Such cements have remarkable mechanical properties due to their very low porosity in spite of having very low density.
摘要翻译:本发明涉及一种用于胶合油井等的水泥浆料,该浆料的密度在0.9g / cm 3至1.3g / cm 3的范围内,并且由固体部分和 具有孔隙率在38%至50%范围内的液体部分。 固体部分由轻质颗粒,微孔和任选的波特兰水泥和石膏的混合物构成。 这种水泥由于具有非常低的密度的非常低的孔隙率而具有显着的机械性能。
摘要:
An aqueous fluid, possibly a wellbore fracturing fluid, comprises an aqueous solution or dispersion of a first polymer, which may be polysaccharide, as a thickener and a cross linking agent to enhance the viscosity of the fluid by crosslinking the first polymer, wherein the crosslinking agent is a second polymer comprising at least one polymer chain with phenyl boronate groups distributed along the polymer chain and the phenyl boronic acid groups have nitrogen attached to the phenyl group at a position which is meta relative to the boronate group.
摘要:
It is proposed a new fluid loss control agent useful for the cementation of oil or gas wells. This fluid loss control agent consists of a mixture of a styrene-butadiene latex and a high molecular weight water-soluble polymer such as a copolymer AMPS-Am. The addition of the water-soluble polymer allows drastic reduction of the quantity of latex required to achieve fluid loss control performance and even gas migration control.
摘要:
A method for treating a well penetrating subterranean formations comprising injecting into the well a composition comprising a high temperature stabilizer composition which comprises at least one mineral-reactive compound; wherein at least a part of the well is at a temperature of at least 120° C. is provided. Also provided is a composition for treating a well comprising a mineral-reactive compound.