G Under The Karamay Oilfield Reservoir Acidification Technology Research

Sandstone reservoir spread all over the continent in China, because of the complex constituent of sandstone, the reservoir is vulnerable to damage. Sandstone reservoir is reclaimed by means of acidizing to enhance exploitation effect. because of the poor recognition of the reservoir feature, inaccurate analysis of reservoir damage causality, the acid type and acid formula be not fit for the reservoir, The acidizing measure of Kelamayi oilfield kexia group T system sandstone reservoir is not effective, the productivity is enhanced in the near future.According to the situation, in the point of acidizing measure to the reservoir, the paper goes over the reservoir feature of Kelamayi oilfield kexia group, combines in-situ construct with laboratory experiment to carry out the analysis of damage to reservoir, promulgates the elements of reservoir damage, makes progress in the acidizing systems. The paper chooses a series of acid systems to complete the resolution experiments, selection and appraise of acid additives, the appraise to the overall performance of acid formulas, the appraise of core acidizing effect by means of many laboratory testing technique and approaches so as to select the suitable acid system to the reservoir, the paper for the first time applies the multi-hydrogen acid system in the sandstone acidizing of Kelamayi oilfield. In order to enhance the level of matrix acidizing design further, focusing on the heterogeneity and thick producing pay of Kelamayi oilfield , the paper advances diversion-bridging technique to intensify the effect of acidizing, builds up the pattern of the borehole temperature field, the pattern of reservoir temperature field considering the heat produced by the reaction between acid and rock as well as the pattern of the acid concentration distribution considering the affection of hydrofluosilicic acid and silica gel, as a result it accurately reflects the sandstone acidizing reaction mechanism .On the basis of ding this, the paper develops fluids rate forecast mathematical model of acidizing well. sandstone acidizing, improves sandstone acidizing mathematical model systems.The paper selects the acidizing system which is well fit for the Kelamayi oilfield kexia group through the research in the paper,it also enriches the selection of reclamation technique by means of introducing the new acid system, field practice proves the validity of the multi-hydrogen acid system and fluo boric acid system which are dominant in the area in the future.