摘要
针对常规酸化胶凝剂用量大、耐温性能差、缓速能力有限的缺点,分别以一定量的N,N-二甲基丙烯酰胺、二甲基二烯丙基氯化铵和2-丙烯酰胺基-2-甲基丙磺酸为原料,在45℃、油水比为2∶3、复合乳化剂总浓度为5%、单体总浓度为40%、油溶性引发剂总浓度为单体总浓度的0.15%和氮气保护的条件下,采用反相乳液及油溶性引发剂氧化还原体系聚合的实验方法,合成出了耐高温酸化用胶凝剂CAT-3,并对其纯化试样进行了红外光谱图表征。室内综合性能评价结果表明:胶凝剂CAT-3具有快速的酸溶能力和良好的酸溶效果,用量少且增黏能力强,剪切稀释性能好,抗盐能力强,适用于130℃左右的酸化施工地层;具有理想的酸岩反应缓速性能,120 min后残酸的浓度保留率仍保持在40%以上,有利于增大酸液溶蚀裂缝的导流能力和延长酸化的有效作用距离,达到深度酸化地层的目的;另外,CAT-3与常用酸化添加剂的配伍性能好,不会对地层产生二次伤害,有利于酸化作业过程中储层的保护。
Conventional gellants used in acid stimulation have poor temperature stability and limited retarding capacity,and frequently a large amount of gellant is needed in acid stimulation.A new gellant is now synthesized using reverse emulsion polymerization in laboratory in the following conditions: raw material: N,N-dimethyl acrylamide,diallyl dimethyl ammonium chloride,and AMPS;temperature 45 ℃;oil/water ratio 2∶3;concentration of compound emulsifier 5%;total concentration of monomer 40%;total concentration of oil soluble initiator,0.15% that of monomer;nitrogen.A purified sample of this gellant was characterized using infrared spectra.Laboratory study showed that CAT-3 is ready to dissolve in acids and has good viscosifying capacity at lower concentration.It also has good shear thinning property and salt tolerance.CAT-3 is suitable for use in acid stimulation at 130 ℃ and has satisfactory acid-rock reaction retardation effect.Acid retention is 40% after 120 min of application,meaning that the flow conductivity of the acid-eroding fractures can be improved and the effective working distance of acid can be extended,resulting in a deep acidification.Moreover,CAT-3 has good compatibility with other acid stimulation additives and produces no secondary damage to formations it works on.
出处
《钻井液与完井液》
CAS
2009年第4期52-55,共4页
Drilling Fluid & Completion Fluid
关键词
胶凝剂
高温
酸化
增产措施
防止地层损害
Gellant
Acid stimulation
Stimulation
High temperature
Formation damage prevention
