古潜山油藏高效解堵剂研究
发布时间：2018-07-15 08:19
【摘要】：兴古潜山油藏具有油层致密,有效孔隙低,连通性差等特点。油田开发及生产过程中,不配伍流体浸入地层,完井后投产前泥浆替换不彻底,采油生产过程中造成的液锁、水锁、乳液伤害,作业过程中造成的颗粒堵塞等都会导致储层渗透率降低、油气井产能下降。改造堵塞油层的有效方法是酸化解堵作业。本文针对兴古潜山油田的特性,通过对油藏堵塞机理分析及酸岩溶蚀实验,确定出既能有效解堵,又不破坏地层骨架的CZ-21酸液为古潜山油田酸化高效解堵剂的主体酸体系；合成了转向能力较强的油酸酰胺丙基甜菜碱类酸液转向剂,在剪切速率为170s-1、温度为80℃、pH为4的条件下,含转向剂的酸液粘度仍然保持在300mPa·s以上,具有较好的耐温性；筛选并确定浓度为1.0%的缓蚀剂B、防乳破乳剂DQ-5、铁离子稳定剂NTA及合成的酸液转向剂为酸化工作液的主要添加剂。对兴古潜山油田原油(兴古7—16油井)形成酸渣的影响因素及其对储层的伤害进行了研究,并对兴古潜山油田酸化现场施工工艺研究进行了探讨。认为酸渣形成的内因是原油内部的胶质和沥青质含量,随着原油中胶质、沥青质含量的增加,酸油混合物形成的酸渣量逐渐增大,当胶质沥青质含量增加到10%左右时,生成的酸渣量明显增大；外因是注入流体中含不配伍性离子,以铁离子最为显著,其中Fe3+对酸渣的形成起着至关重要的作用。
[Abstract]:Xinggu buried hill reservoir is characterized by tight reservoir, low effective porosity and poor connectivity. In the course of oilfield development and production, the unmatched fluid is immersed in the formation, the mud is not completely replaced before the completion of the well, and the liquid lock, water lock and emulsion damage caused by the oil production process, The grain plugging during operation will lead to the decrease of reservoir permeability and productivity of oil and gas wells. The effective method of improving plugging reservoir is acid solution plugging operation. According to the characteristics of Xinggu buried hill oilfield, through the analysis of reservoir plugging mechanism and acid rock dissolution experiment, it is determined that CZ-21 acid solution, which can effectively remove plugging without destroying formation skeleton, is the main acid system of acidizing and high efficiency plugging agent in buried hill oilfield. An oleic acid amide propyl betaine acid steering agent was synthesized. When the shear rate was 170s-1 and the temperature was 80 鈩，
本文编号：2123445
[Abstract]:Xinggu buried hill reservoir is characterized by tight reservoir, low effective porosity and poor connectivity. In the course of oilfield development and production, the unmatched fluid is immersed in the formation, the mud is not completely replaced before the completion of the well, and the liquid lock, water lock and emulsion damage caused by the oil production process, The grain plugging during operation will lead to the decrease of reservoir permeability and productivity of oil and gas wells. The effective method of improving plugging reservoir is acid solution plugging operation. According to the characteristics of Xinggu buried hill oilfield, through the analysis of reservoir plugging mechanism and acid rock dissolution experiment, it is determined that CZ-21 acid solution, which can effectively remove plugging without destroying formation skeleton, is the main acid system of acidizing and high efficiency plugging agent in buried hill oilfield. An oleic acid amide propyl betaine acid steering agent was synthesized. When the shear rate was 170s-1 and the temperature was 80 鈩，
本文编号：2123445
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