莫里青油藏强水敏储层酸化解堵技术研究

发布时间：2018-02-08 23:35

本文关键词： 水敏储层乳化酸醇基酸解堵性能评价工艺优化　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：针对莫里青油藏伊通盆地莫里青断陷西北缘双阳组二段储层注水困难的实际情况,首先分别对油田地层损害、油井堵塞原因、油井腐蚀原因、潜在酸化伤害和结垢原因等5个因素进行了再认识和分析,结果表明,除了地层敏感性导致损害之外,悬浮固体颗粒,垢,细菌及腐蚀产物,潜在的二次酸化沉淀物及沥青质胶质也对储层产生伤害。接着分析了砂岩储层矿物与盐酸、氢氟酸、氟硅酸、氟硼酸以及多氢酸等酸液的反应机理,为优化酸化提供理论支撑。在综合分析莫里青油藏基本特征、储层伤害机理和酸岩反应机理的基础上,提出开展油包水型乳化酸解堵体系和醇基酸解堵体系研究及解除地层伤害评价,为现场应用做好前期基础研究。采用单因素法筛选乳化缓速酸解堵主酸体系配方63%土酸+30%0#柴油+2%复合乳化剂+1%铁稳定剂+3%防膨剂+0.1%助排剂。研制的乳化酸解堵液表面张力小,致使其在亲油岩石界面上的铺展系数大,有利于酸-岩反应均匀进行；粘度比未乳化土酸略大,有利于增加了内相的H+的穿透阻力,降低了酸-岩反应速率；密度比未乳化土酸略小,有利于残酸返排。该乳化酸具有缓速、防腐、防膨以及对岩石骨架损害小等优良性能,溶蚀速率缓升缓降,有利于近井地带酸化。同样采用单因素法筛选醇基酸解堵主酸液体系配方8%HCl+6% NH4F+1％ ATPM+2% SL-HS2(缓蚀剂)+1%EDTA(铁稳定剂)+2%防膨剂(KL无机盐+SL阳离子表面活性剂)+0.1%FC7321(助排剂)+25%乙醇。醇基酸解堵液也具有缓速、防腐、防膨以及对岩石骨架损害小等优良性能,对砂岩岩心的溶蚀速率呈现出缓升缓降的变化,达到了缓慢溶蚀的目的,有利于深部地层解堵和解除污染。室内模拟酸化现场工艺实验表明,乳化缓速酸解堵主酸体系和醇基酸解堵体系能够有效恢复并提高未污染和污染后的岩心渗透率,能满足了现场施工需要。
[Abstract]:In view of the difficulty of water injection in the second member of Shuangyang formation in the northwestern margin of Morri fault depression in Morri Qing reservoir, the formation damage, oil well blockage and oil well corrosion are caused by formation damage, oil well plugging, oil well corrosion, respectively. Five factors, including potential acidizing damage and scaling cause, were re-recognized and analyzed. The results showed that, in addition to formation sensitivity, suspended solid particles, scale, bacteria and corrosion products, Potential secondary acidizing precipitates and asphaltene also damage the reservoir. Then the reaction mechanism of sandstone reservoir minerals with hydrochloric acid, hydrofluoric acid, fluorosilicic acid, fluoroboric acid and polyhydrogen acid is analyzed. On the basis of comprehensive analysis of the basic characteristics of Morri oil reservoir, reservoir damage mechanism and acid rock reaction mechanism, The research on water-in-oil emulsified acid plugging removal system and alcohol-based acid plugging removal system and the evaluation of formation damage relief are put forward. The formulation of 63% earic acid 300# diesel oil 2% composite emulsifier 1% iron stabilizer 3% anti-swelling agent 0.1% was selected by single factor method for field application. The surface tension of acidizing and plugging solution is small, As a result, its spreading coefficient on the interface of oil-friendly rock is large, which is favorable to the homogeneous acid-rock reaction, and its viscosity is slightly higher than that of unemulsified soil acid, which is beneficial to increase the penetrating resistance of H in the inner phase and to reduce the acid-rock reaction rate. The density is slightly smaller than that of unemulsified soil acid, which is favorable to the residual acid reflux. The emulsified acid has excellent properties such as slow speed, anticorrosion, anti-swelling and little damage to the rock skeleton, and the dissolution rate rises slowly and decreases slowly. It is beneficial to acidification near well area. Similarly, the single factor method is used to screen out HCl 6% NH4F 1% ATPM 2% SL-HS2 (corrosion inhibitor) 1TA (iron stabilizer) 2% anti-swelling salt SL cationic surfactant). 0.17321 (drainage aid) 25% ethanol. The alcohol-based acid deplugging solution also has a slow speed. The excellent properties of anticorrosion, anti-swelling and small damage to the rock skeleton show a slow rise and decrease in the dissolution rate of the sandstone core, and achieve the purpose of slow dissolution. Laboratory simulation of acidizing field experiments show that the main acid system and the alcohol-based acid plugging system can effectively restore and improve the permeability of unpolluted and polluted cores, and the experimental results show that the emulsion slow acid removal system and the alcohol-based acid plugging system can effectively restore and improve the permeability of unpolluted and polluted cores. Can meet the site construction needs.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.2

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