一种用于二氧化碳泡沫压裂液的稠化剂研究

发布时间：2018-07-03 00:17

  本文选题：稠化剂 + 二氧化碳泡沫压裂液　； 参考：《西南石油大学》2017年硕士论文

【摘要】：随着我国对低渗透油气藏,特别是水敏、水锁、裂缝性以及枯竭的低能量油气藏勘探开发的不断深入,二氧化碳泡沫压裂液以其携砂能力强、滤失低、伤害小以及返排迅速、彻底等优势而备受青睐。但是目前使用的二氧化碳泡沫压裂液仍然是以传统的交联胍胶压裂液为液相形成的泡沫体系,传统交联胍胶压裂液所存在的对地层伤害大等问题依然影响着二氧化碳泡沫压裂液的整体性能和压裂增产改造的效果。而VES-CO2泡沫压裂液由于其本身不包含聚合物彻底解决了残渣含量高和破胶不彻底等问题,但是也受到耐温能力和成本的限制,无法广泛应用。本文通过研究新型非交联压裂液体系与二氧化碳泡沫压裂技术的特点,以丙烯酰胺(AM)、含刚性基团的阴离子单体(SS-n)和十六烷基二甲基烯丙基氯化铵(C16DMAAC)为聚合单体,以水溶液无规共聚的方式合成了聚合物稠化剂DF,并对实验条件进行了初步的优化。对合成的聚合物稠化剂进行红外光谱表征、热重分析和溶解性能测试等,实验结果表明聚合物稠化剂基本达到了理论设计的要求。在稠化剂DF的基础上,完善二氧化碳泡沫压裂液体系配方,分析聚合物稠化剂实际应用的可行性。实验研究结果表明,由该聚合物稠化剂配制的二氧化碳泡沫压裂液液相具有良好的耐温耐剪切性能,160℃条件下持续剪切120min(170s-1)黏度值保持在40mPas以上,保证了足够的悬砂能力,同时良好的流变性能保证了其起泡能力和泡沫稳定性,在30℃条件下起泡率约为325%,析液半衰期达到135h。通过破胶性能测试和导流能力分析,二氧化碳泡沫压裂液破胶彻底,破胶液表面张力小,残渣含量低,对支撑剂导流层几乎不产生伤害,表现了良好的清洁效果。本文通过理论研究、实验合成和性能评价,验证了合成的聚合物稠化剂用于二氧化碳泡沫压裂液的可行性,同时其表现出来的良好的应用性能解决了目前对于低渗透油气资源压裂增产改造中遇到的问题,为有效开发利用低渗透油气资源提供了新的参考。
[Abstract]:With the deepening of exploration and development of low permeability reservoirs, especially water sensitive, water locked, fractured and depleted low energy reservoirs in China, carbon dioxide foam fracturing fluid has strong sand carrying capacity, low filtration loss, low damage and rapid backflow. Thoroughly and so on superiority and so on is favored. However, the carbon dioxide foam fracturing fluid currently used is still a foam system formed by using the traditional crosslinked guanidine gel fracturing fluid as the liquid phase. The problems existing in the traditional crosslinked guanidine gel fracturing fluid still affect the whole performance of carbon dioxide foam fracturing fluid and the effect of fracturing stimulation. However, VES-CO2 foam fracturing fluid can not be widely used because it does not contain polymer completely to solve the problems of high residue content and incomplete gel breaking, but it is also limited by heat resistance and cost. In this paper, the characteristics of new uncrosslinked fracturing fluid system and carbon dioxide foam fracturing technology were studied. Acrylamide (AM), anionic monomer (SS-n) with rigid group and decaalkyldimethylallylammonium chloride (C16DMAAC) were used as polymeric monomers. The polymer thickener DFD was synthesized by random copolymerization of aqueous solution and the experimental conditions were preliminarily optimized. The synthesized polymer thickener was characterized by infrared spectroscopy, thermogravimetric analysis and solubility test. The experimental results show that the polymer thickener basically meets the requirements of theoretical design. Based on the thickener DF, the formula of carbon dioxide foam fracturing fluid system is improved, and the feasibility of practical application of polymer thickener is analyzed. The experimental results show that the liquid phase of carbon dioxide foam fracturing fluid prepared with this polymer thickener has good temperature and shear resistance at 160 鈩，

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