Exploitation Effect Evaluation And Potential Analysis Of Remaining Oil In Dalaoye Oilfield

What effectiveness evaluation of oil development and potential analysis of remaining oil run through all development course of oilfield is the important means of clearing direction of digging the potential and clearing adjustment measures, at present, exploitation of Dalaoye oilfield has fully entered into high water-cut period, and it’s more and more difficult for the exploitation. It’s an impending problem to go deep into excavating exploring potential of high water-cut oilfield, deepen realizing rules of petroleum reservoir exploitation and guide exploitation of oilfield that is more reasonable and efficiently.The article, firstly, introduces geographic position and construction position of Dalaoye oilfield, secondly, introduces overview of the geological conditions from drilling and running into the sequence of formation, regional structure characteristics, history of structural evolution of south of Songliao basin and sedimentary characteristics of Quantou group and Qingyiduan period of south of Songliao basin and so on, at the same time, overview of the exploration and development situation from exploration situation, reserves saturation and exploitation course and current situation, finally, the principal contradiction and problems existing in the clear is in the development process: 1) big reserve base, low recovery percent of reserves, high comprehensive water-cut, slow rate of oil production; 2) due to vertical heterogeneity is strong, the contradiction between the layers is outstanding, vertical oil layer drawn on is uneven, most of oil layer have been perforated, but significant degree of being used is low; 3) maximum and horizontal the orientation of major principal stress is nearly east-west direction, due to mostly wells are fractured, between oil wells and water wells form passage of water logging nearly east-west direction and north-east direction, and response of oil wells of north-south direction is bad, the range of swept volume of water drive is small, wells of no avail or low efficiency circulation is increasing; 4) what distribution of range of lengthways employ, range of water logging and plane area of water logging is unclear lead to productive result of infill well is bad; 5) what remaining oil distribution is unclear lead to that aim of overall system adjustment is unclear and measure effect is bad. This article embarks from the oil well drilling characteristics, researching change condition of relevant dynamic indicator of water injection pressure, differential pressure of production, liquid-producing of the whole district, oil-producing and containing water, liquid-producing of different type of oil wells and containing water, productivity index, fluid productivity index and water absorption index and so on and the change of containing water and rule of production decline in each teams. Correlative analysis method and injection-production dynamic response method can judge through the water and water driving direction, common basic approaches include the method of tracer material, disturbed well testing, geological data analytical method and correlative analysis method of dynamic data and so on, the method of tracer material of them is most immediate and accurate, while its period is longer, its cost is higher, however the cost of correlative analysis method of dynamic data is lowest and the most practical method. After situation analysis of water logging, the method of water drive curve, decay curve, Tong’s curve and residual recoverable reserves of single well ensure recoverable reserve of water drive and recovery efficiency, and then evaluation the result of water drive and use ratio of water injection. By energy analysis of oil and gas reservoir, applying rule of thumb statistical net pay thickness and ensuring reserve utilization extent of water drive of oilfield. What computational analysis indexes of reasonable flowing pressure, reasonable reservoir pressure, maximum water injection pressure and well spacing density of injection-production ratio and adaptation of well pattern, injection-production distance, oil and water wells ratio and way of well spacing and so on in injection-production pressure system, measure effect is evaluated by statistics of measure effect and influence factor analysis of fracturing effect, can complete dynamic analysis and development effectiveness evaluation in Dalaoye oilfield.We should research topography of remaining oil distribution to clear direction of overall system adjustment and effective rate of measures for enhancing activity. By establishing geologic model of three-dimensional of simulation area and applying matching of reserves of partition and the means of numerical reservoir simulation of history matching of dynamic condition analyze the reason of remaining oil. For researching rules of remaining oil distribution, firstly, statistics mining condition of each sand-group, secondly, statistics topography and reserve abundance of remaining oil of different micro-phases of each single layer, and then arriving at regularities of horizontal distribution of remaining oil of each sand-group, finally arriving at measuring of digging the potential of different type of remaining oil from regularities of plane remaining oil distribution.