奈曼油田油水井解堵工艺技术研究及应用

为了解决奈曼油田开发中后期油层堵塞、产量下降、注水压力增高等问题,需要研制高效能的解堵剂和施工工艺。根据岩心溶解实验结果,确定油井解堵剂主体酸液为有机酸,注水井解堵剂主体酸液为多氢酸。通过对大量室内实验数据的分析,优选出黏土稳定剂、缓蚀剂、铁离子稳定剂、防乳化剂、助排剂等助剂的组成成分和配比,形成了油井高效解堵剂和注水井多氢酸解堵剂的基本配方和施工工艺。根据实验优选得到的高效解堵剂配方和多氢酸解堵剂配方,对2口油井和1口注水井进行了现场试验,2口油井有效期内分别累计增油636.7t和356t,注水井由日注17.91m3/d增至24.7m3/d,注入压力由16.8MPa下降至12.5MPa,基本达到了配注要求。试验结果表明,新研制的油、水井解堵剂较好地解决了地层污染和堵塞问题,显著提高了油井产量,注水井达到了降压增注的目的。

Research and Application of Blocking Removal Technology for Oil and Water Wells in Naiman Oilfield

In order to solve the problems of reservoir choke ,production rate decline ,water injection pressure increase and so on,high efficient water block remover and operating technology need to be developed.Based on the experiment result of core dissolution ,the main acidizing fluid of the water block remover is known as organic acid and multi-hydro acid respectively for the oil wells and water injection wells.After analysis on a large amount of laboratory experiment data ,component and match of the auxiliary （clay stabilizer, corrosion in- hibitor,Fe stabilizer,non-emulsifying agent and cleanup additive） are selected well and basic recipe and oper- ating technology of the water block remover for oil and water wells are formed.The optimized recipe based on the experiment result is applied to two oil wells and one water injection well in the field.Cumulative in- cremental oil is 636.7t and 356t respectively for two oil wells during term of validity.Daily water injection increased from 17.91m^3/d to 24.7m^3/d for the water injection well and injection pressure dropped from 16.8MPa to 12.5MPa.The demand of injection distribution is met basically.Experiment results show that newly developed water block remover for oil and water wells may solve the formation pollution and blockage,and oil well production is enhanced greatly and the goal of pressure drop and injection increase is achieved for the water injection well.