新型高温高粘酸液胶凝剂的合成及酸液体系的研究

【作者】 胡佩；

【导师】 胡星琪； 赵金洲；

【作者基本信息】 西南石油学院 ， 应用化学， 2005， 博士

【摘要】 酸压是油气藏重要的增产措施之一,酸压工作液及酸液添加剂的性能直接影响酸化效果,对低渗透、高温深井尤为突出。目前常规的酸液体系在深井高温条件下,缓速能力有限,不能形成较长和具有一定支撑能力的酸蚀裂缝。 本文以塔河油田奥陶系缝洞型碳酸盐岩油藏为切入点,合成了两种新型聚合物酸液胶凝剂(PDA和PDMC)。胶凝剂PDA是甲基丙烯酰氧乙基三甲基氯化铵(DMC)和丙烯酰胺(AM)的共聚物;胶凝剂PDMC是DMC的均聚物。研究了影响聚合反应的各种因素(如pH、单体配比、单体的总浓度、引发剂的类型和用量、温度、反应时间等),并对合成产物进行了IR、~1H-NMR结构表征。性能评价结果表明:其增粘效果好,抗温性能好,与各种酸液添加剂也有很好的配伍性。 本文以自己合成的胶凝剂为主剂,研制了两套适应高温、深井酸压改造的工作液体系,即高温冻胶酸体系和高温低固相胶凝酸体系。特别是高温低固相胶凝酸体系,将通常酸液体系中聚合物(胶凝剂)含量从0.8%～1.0%降到0.5%～0.6%左右,减少了40%～50%聚合物的用量,从而减小酸压过程中聚合物对储层造成的潜在伤害。 本文还对胶凝酸体系的流变性、酸-岩反应动力学参数、酸蚀裂缝的导流能力进行了完善的研究,为优化酸压施工工艺提供科学依据。结果表明:研制的酸液体系具有良好的抗温性能,可有效地降低酸液滤失和延缓酸-岩反应速度。完全能够满足塔河油田奥陶系碳酸盐岩储层的酸压施工要求,对我国其它油田资源的开发也具有现实意义。更多还原

【Abstract】 Acid and frac treatment is one important measure for hydrocarbon reservoir to increase production, the performance of acid and frac working liquid and acidizing fluid additive directly affect the effect of acid and frac treatment, especially for deep wells with high temperature and low permeability. At present, under the deep well condition with high temperature, the routine acidizing fluid has limited ability of slowing rate , can not form the longer acid etching fracture hat has some sustaining ability. ,This paper aims at the sutural carbonate rock reservoir in Ordovician TaHe oilfield. Two new kinds of polymer sour liquid gelling agents (PDA and PDMC) have been synthesized. The gelling agent PDA is the copolymer of methacryloyloxyethyl trimethyl ammonium chloride (DMC) and acrylamide (AM); the gelling agent PDMC is the homopolymer of DMC. The influential factors of polymerization reaction have been studied ( such as catalyst, pH, mass ratio of monomers, total concentration of monomers, the type and mass of initiator, temperature and reaction time etc.) IR and the H-NMR structural symptom have been carried out for composing outcome. Performance appraisement shows: It has good tackify effect, temperature-tolerance performance, and compatibility with various acidizing liquid additives.In this paper, using the gelling agent synthesized by myself as host agent, two sets of working liquids that meet the acid and frac treatment in deep wells with high temperature have been developed : the jell acid system and low solidoid gelling acid system. Special for high temperature low solidoid gelling acid system, it dropped the polymer content from 0.8% ~ 1.0% in the common acid liquid to 0.5% ~ 0.6% , reduced 40% — 50% polymer dosage, so it can reduce the potential injury to reservoir bed causing by polymer in process of acid and frac treatment.In this paper, the rheological property of gelling acid system, the reaction dynamics parameter of acid-rock and the flow conductivity of acid-etching fracture had still been completely studied. It offered scientific basis for optimization acidtreatment. Show as a result: The acid liquid has good temperature-tolerance performance; it also can reduce the filtration efficiently and delay acid - rock reaction speed. The system can satisfy completely the requirements of acid and frac treatment in carbonate rock reservoir in Ordovician TaHe oilfield. For other oilfields of our country, it also has realistic meaning.更多还原