渤海SZ36-1油田不动管柱酸化液配方研究与应用

渤海SZ36-1属高孔高渗弱胶结的砂岩稠油油藏,考虑要有效解除近井地带的堵塞及实现深部酸化处理,同时尽量减少对井下管柱、电泵机组及电缆的腐蚀以实现不动管柱酸化作业,在对SZ36-1油田储层特点分析及大量室内试验的基础上,筛选出了以氟硼酸为主的酸化液配方。该配方体系既不破坏砾石充填层,同时对生产管柱、电泵机组及电缆腐蚀破坏小,又能有效解除近井带堵塞,而且酸液在搁置时间2天后酸液质量仍然较好,能满足面积有限的平台间隔注酸作业。

Research and Application of Acidizing Fluid Formulae with Original Production String Acidizing for Bohai SZ36-1 Oil Field

SZ36-1 oil field of Bohai is weakly consolidated sand formation which is characteristic of high porosity, permeability and viscosity. In order to realize an acidizing treatment with original production string which will lead to an effective removal of the near wellbore zone plug and a deep penetration of the acid without significant erosion of downhole string, ESP and its wireline, an acidizing fluid foumula fluorboric acid is selected on the base of analyzing the feature of SZ32-1 oil field and running a large number of laboratory experiments. This formular can remove the plugging of near wellbore zone effectively and do little damage to gravel pack, downhole string, ESP and its wireline, and also maintain its good quality after a 2-day lay aside, which meets the needs of interval injecting acid when platform area is limited.