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延长下古生界白云岩气层是奥陶系马家沟组经长期岩溶风化形成的白云岩储层,目前多采用稠化酸闭合酸压工艺技术进行开发,酸压效果整体上不理想。动静态酸岩反应实验发现,主力层段天然裂缝发育非均质性较强,多级酸压工艺、转向酸酸压工艺或多氢酸酸压工艺也具有很大的不确定性。为解决这一问题,开展了白云岩储层动静态酸岩反应室内实验研究。根据白云岩储层的动静态酸岩反应情况及岩心表面酸溶蚀形态宏观与微观特征及其与物性、注入排量和注入压力的关系,发现储层中良好的酸蚀形态多分布于裂缝、溶洞周围,具有很强的非均匀性,稠化酸酸液优于普通酸液。在储层地质特征研究和室内实验的基础上提出适用性较强的稠化酸二次增黏工艺、变黏酸压工艺,低黏酸缝网酸压工艺技术等多种新型酸压工艺技术措施,对本区域的白云岩储层整体酸压开发实践具有很好的指导意义。
Extending the Lower Paleozoic dolostone gas layer is a dolomite reservoir formed by the long-term karstification weathering of the Ordovician Majiagou Formation. At present, the development of the closed acid acidification technology with thickening acid is currently used. The acid pressure effect as a whole is not satisfactory. Dynamic and static acid rock reaction experiments found that the main section of natural fracture development heterogeneity is strong, multi-stage acid pressure process, divert acid pressure process or multi-hydrogen acid pressure process also has great uncertainty. In order to solve this problem, laboratory experiments on the dynamic and static acid-rock reaction of dolomite reservoirs have been carried out. According to the dynamic and static acid-rock reaction of dolomite reservoirs and the macroscopic and microscopic characteristics of acid dissolution form of core surface and its relationship with physical properties, injection displacement and injection pressure, it is found that the good acid corrosion morphology in reservoirs distributes in fractures, Around the cave, with a strong non-uniform, thick acid acid is superior to ordinary acid. Based on the study of reservoir geological characteristics and laboratory experiments, a series of new acid pressure technologies, such as thickening acid secondary thickening process, variable viscous pressure process and low viscous acid stitching acid pressure process, are proposed The measures have a good guiding significance for the development of the whole acid pressure in the dolomite reservoir in this area.