摘要:
It is proposed a new family of terpolymers based on repeating units of two different types of hydrophobic moieties modified with anionic charged groups. In a preferred embodiment, the first hydrophobic moiety is an aromatic compound such as styrene and the second hydrophobic moiety is a fatty acid. Depending on the modification rate, and on the neutralization degree, the aqueous solutions of the terpolymers have different rheological behavior, ranging from yield point fluid, shear-thickening and polysoaps.
摘要:
The present invention provides a water-based fluid, in particular for drilling, completion or for any other intervention in a well such as a hydrocarbon well, in which the viscosity is controlled by a system constituted by precipitated silica nanoparticles (A) associated with a water-soluble copolymer (B) comprising one or more water-soluble co-monomers (I) having little or no affinity for silica and one or more co-monomers (II) which absorb onto the silica. The invention is of particular application to the secondary recovery of hydrocarbons.
摘要:
The invention concerns a method for preparing anisotropic silica aggregates comprising the following steps: a) contacting at least one polymer with non-aggregated silica particles and/or highly dispersed in an aqueous medium, with a ratio R, polymer weight to silica particle surface, ranging between 0.03 and 2 mg/m; 2; and whereof the electrostatic value of the silica particle surface is not less than the value of the charge of the silica particle surface measured in an aqueous phase without added salts at a pH not less than 7; b) consolidating the aggregates obtained at step a) either by heat treatment, or by precipitation of a mineral compound. The invention also concerns a silica aggregate comprising a chaining of elementary particles whereof the number of particles ranges between 5 and 15, whereof 80% of elementary particles are in contact with not more than 2 particles and whereof the greatest distance measurable between 2 points of the aggregate is not more than 5 times the average size of one elementary particle.
摘要翻译:本发明涉及一种制备各向异性二氧化硅聚集体的方法,包括以下步骤:a)使至少一种聚合物与非聚集的二氧化硅颗粒接触和/或高度分散在水性介质中,R与聚合物重量与二氧化硅颗粒表面的比率, 范围在0.03至2mg / m; 2; 并且二氧化硅颗粒表面的静电值不小于在不低于7的pH下在没有添加盐的情况下在水相中测量的二氧化硅颗粒表面的电荷的值; b)通过热处理或通过沉淀矿物化合物来固化在步骤a)获得的聚集体。 本发明还涉及一种二氧化硅聚集体,其包含基本粒子的连接,其中粒子数目在5至15之间,其中80%的基本粒子与不超过2个粒子接触,并且其中2个点之间的最大距离可以测量 聚集体不超过一个基本粒子的平均尺寸的5倍。
摘要:
(Meth)acrylic copolymers of general formula ##STR1## in which: the M.sup.+ are monovalent cations arising from the neutralization of the --COOH groups, it being possible, however, for this neutralization to have been only partial;R.sub.1 and R.sub.2 are chosen from: hydrogen, long-chain linear or branched cycloalkyl or alkyl radicals and aryl radicals having from 8 to approximately 22 carbon atoms, with the condition that at least one of R.sub.1 and R.sub.2 is not hydrogen;R.sub.3 and R.sub.4 are independently chosen from: the hydrogen atom, short-chain cycloalkyl or alkyl radicalshaving from 1 to 7 carbon atoms and aryl radicals having from 6 to 7 carbon atoms;R.sub.5, R.sub.6, and R.sub.7 are each, independently of one another, chosen from the hydrogen atom and the methyl radical;.tau..sub.1 is the molar level of long-chain amide units in the copolymer; and.tau..sub.2 is the molar level of short-chain amide units optionally present in the copolymer.Their weight-average molar mass does not exceed 30,000 and .tau..sub.1 is between 0.01 and 0.30.
摘要翻译:PCT No.PCT / FR96 / 01309 Sec。 371日期:1998年9月18日 102(e)1998年9月18日PCT PCT 1996年8月22日PCT公布。 出版物WO97 / 08217 日期1997年3月6日(Meth)通式的丙烯酸共聚物,其中:M +是由-COOH基团中和产生的一价阳离子,然而,这种中和可能只是部分的; R 1和R 2选自氢,长链直链或支链环烷基或具有8至约22个碳原子的烷基和芳基,条件是R 1和R 2中的至少一个不是氢; R 3和R 4独立地选自:氢原子,短链环烷基或具有1至7个碳原子的烷基和具有6至7个碳原子的芳基; R5,R6和R7各自独立地选自氢原子和甲基; tau 1是共聚物中长链酰胺单元的摩尔水平; tau 2是任选存在于共聚物中的短链酰胺单元的摩尔水平。 它们的重均摩尔质量不超过30,000,而tau 1在0.01和0.30之间。