Research On Distribution Of Remaining Oil Of Block Qi 13 In Liao He Oilfied

Considering the current problems that parts of the old domestic fields mostly have, such as low formation pressure, poor fluid production ability, complex geological conditions, smaller oil belt, poor physical property, strong heterogeneity and relatively complex lithology, and with the aim of fully improving the oil recovery efficiency, this paper makes a comprehensive research on the effect of water flooding development of Qi 13 area of Liaohe oilfield. Combined with the actual geological and development situations of Qi 13 area, through the calculation of ten indicators:the utilization condition of injected water, well pattern adaptability evaluation, the perfect degree of the injection-production well spacing evaluation, assessment of water drive recovery factor evaluation, the condition of water cut and so on, the paper definitely presents that the situation of water flooding development effect in the study area is poor, and well deployment should be used to improve the development effect.Based on rebuilding geological models and the comprehensive analysis of the reservoir engineering evaluation indexes, the latest static and dynamic data of Qi 13 area is employed to perform new reservoir numerical simulations in the study area. The result shows that the model's reserve of Qi 13 area reservoir is 193.3×104t. Compared with 191×104t, its real geological reserves, the relative error is-1.2%. Besides, the single well fitting rate of the simulation numerical is 88%, and the simulation calculation of composite water cut relative error is 1.2%. The fitting of the actual production data of the oil field sets stage for the re-recognition of the reservoir, recalculating the oil reservoir producing condition of a few small layers and predicting the distribution of residual oil. The fitting results show that the model is highly in line with the practical situation.The data of actual production and development is employed to redraw the graph of the remaining oil saturation in Qi 13 area. The result shows that there is still a large number of residual oil remaining in the strata of this area, which mainly distributed in the simulation layer of Xing I, Xing II, and Xing III. The poor reservoir property of the non-active layers, low degree of well pattern control on the longitudinal of Qi 13 area result in the enrichment of the remaining oil, and because of the thin layer, small area and high difficulty of tapping of the non-main layer, along with serious water flooding in the main plane major reservoir, the remaining oil distributes in the edge and thin parts of the reservoir. Besides, since there is no well control, the fault will screen the water injection, resulting in the enrichment of the remaining oil in high parts of the reservoir, near the fault structure.According to the study on the regularities of remaining oil distribution of Qi 13 area in Liaohe oilfield above, some related problems are found:the study area is lack of reservoir energy supplement, the remaining oil is highly fragmented, injected water runs through along the wide channel, few wells is available and so on. Therefore, in view of these problems in combination with the practical production situation of oil field, well deployment is proposed, and the predicts of new well index should be carried out.