The Research And Application Of Separate Minilayer Acidify Technology For Wei2 Block Oilfield

The wei2 block oilfield has more sublayers, thin interbed, strong aeolotropism, and poor effect of commingled acidify. For the oilfield's actual situation, according to the test result of PND and Sor, and binding the production performance of the oilfield, we optimize the separate minilayer acidizing fluid and its additives. We investigate the mechanism of separate minilayer acidify technology, quantify the relationship between implementation parameters and increase production. We treating separate minilayer acidify as the foundation and combinding the extensional characteristics of oil/water well, develop many applicable polytecnica, such as: separate minilayer-allocation, separate minilayer-water plugging, separate minilayer-reversed acidify,separate minilayer-strong acid exploitation and so on, consequently get more oil and less water. And we combind the separate minilayer-allocation, separate minilayer pipe string, multilayer multisection acids, operating technique for small interval with the characteristics of small complex block oilfield, finally built up and improve the separate minilayer acidify technology for anisotropic, flaser oilfield. After acid treatment of low pressure and permeable reservoir, spent acid flows back difficultly. Be aim at this, the technology of"chain reaction"is researched and applied, which depends on double action of gas that are push and pull, improving the degree of spent acid's flowback; filtering system of spent acid that are high efficiency and maneuverable and preferential treating chemical of spent acid are developed, which realize immediate processing of spent acid in the field.In the field conduct, there are 15 times with separate minelayer acidizing in oil/water well. In these wells, there are 14 oil wells. And success rate is 93.3%, availability is 86.7%, cumulative incremental oil production is 8236t, and average increasing production of one well is 588.3t. Separate minelayer acidizing not only achieves dual purpose that per well stimulation and precipitation, but also it can improve the direction of plane waterflood of well group, which advance product effect of whole waterflood.