X加密区调剖工艺适应性研究

发布时间：2019-03-25 10:27

【摘要】：本文针对X西南加密区加密调整和措施调整同一时期进行的复杂开发状况,采用油藏工程方法,研究措施调整后产量递减率、含水上升率等指标变化规律,分析措施效果,建立措施效果评价指标计算方法,合理测算老井以及加密井措施增油量和降水量。通过加密区各调剖井组之间措施效果的对比,从堵水调剖作用机理出发,根据室内实验和矿场试验结果,研究油层地质因素、开发因素、注入工艺因素等对调剖效果的影响,采用灰色关联分析法研究各项影响因素与措施效果的关联度,确定影响该区块措施效果的重要因素,评价调剖体系性能、工艺参数与油藏的适应性。研究结果表明,X西南加密区近年来在加密调整和措施调整期间,产量上升、含水下降,既有加密调整油井数增加的增油作用,也有措施调整增油降水效果,因此研究措施效果要考虑加密井的影响。该区块加密和措施调整结束后产量呈加速递减趋势、含水也呈加速上升趋势,因此仍需开展进一步的措施调整以提高注水开发效果。根据加密区2011~2013年实施堵水调剖的32个井组的措施效果测算结果,6个井组措施增油降水效果显著,单井组措施累计增油1500t以上;18个井组措施增油降水效果较好,平均单井组措施累计增油873t;同时有8个井组措施增油降水效果不明显,单井组措施累计增油不到100t,这类井组需进一步优化注入调剖体系和工艺参数,提高措施效果。堵水调剖效果的影响因素分油层地质因素、开发因素、注入工艺因素三类,X加密区措施井组由于处于同一区块且连片分布,地质开发条件相近,措施效果主要受注入体系和注入工艺参数的影响,注入因素是措施效果的决定因素。根据区块各井组堵水调剖措施效果的对比,整体上“聚合物、弱凝胶+胶粉颗粒及强凝胶”体系更适于该区,其中转注井组应用“弱凝胶+脲醛树脂”效果较好;矿场统计结果也表明,增加注入量和干剂用量可以有效提高措施效果,加密区不同措施效果的井组都有进一步增加注入量和干剂量提高措施效果的余地。本文形成一套特低渗透油藏堵水调剖效果评价指标测算方法,优化了调剖剂注入量和注入方式,可以为油田评价措施效果提供技术支持。
[Abstract]:In view of the complicated development situation of encryption adjustment and measure adjustment in southwestern encryption area of X during the same period, this paper adopts reservoir engineering method to study the changing rule of production decline rate and water cut up rate after the adjustment, and analyzes the effect of the measures. Establish the calculation method of the evaluation index of the effect of measures, and reasonably calculate the oil increase and precipitation of the old well and the dense well. Based on the comparison between different profile control well groups in the dense area and the mechanism of water plugging and profile control, according to the results of laboratory and field tests, the influence of geological factors, development factors and injection technology factors on profile control effect is studied. The grey relational analysis method is used to study the correlation between the influencing factors and the effect of the measures, to determine the important factors affecting the effect of the measures in this block, and to evaluate the performance of the profile control system and the adaptability of the technological parameters to the reservoir. The results show that in recent years, during the period of infill adjustment and measure adjustment, the production has increased and the water cut has decreased in the southwestern dense area of X, which not only has the effect of increasing the number of oil wells by infill adjustment, but also has some measures to adjust the effect of increasing oil and lowering water. Therefore, the effect of research measures should be considered. At the end of the block encryption and measures adjustment, the output decreases rapidly, and the water cut also increases. Therefore, further measures need to be taken to improve the effect of water injection development. According to the results of 32 well groups used in water shutoff and profile control from 2011 to 2013 in the dense area, the results show that 6 well groups have remarkable effect on increasing oil and dewatering, and the single well group has a cumulative oil increase of more than 1500 tons. 18 well groups have a good effect on increasing oil and dewatering, and the average single well group measures have accumulative oil-increasing 873 t; At the same time, 8 well groups have no obvious effect on increasing oil and lowering water, and single well group has less than 100 t cumulative oil increase. This kind of well group needs to further optimize injection profile control system and process parameters, and improve the effect of measures. The influencing factors of water plugging and profile control effect are divided into three types: geological factors, development factors and injection process factors. Because of the same block and the distribution of connected slices in X-dense area, the geological development conditions are similar, and the geological development conditions of the well groups in the X-dense area are similar. The effect of the measure is mainly influenced by the injection system and the injection process parameters, and the injection factor is the decisive factor of the measure effect. According to the comparison of the water plugging and profile control measures of each well group in the block, the "polymer, weak gel powder particles and strong gel" system is more suitable for this area as a whole, and the application of "weak gel urea-formaldehyde resin" in the transfer well group is better. The results of field statistics also show that increasing the amount of injection and the dosage of dry agent can effectively improve the effect of the measures, and there is room for further increasing the injection volume and increasing the effect of the dry dose in the well groups with different effects of the measures in the dense area. In this paper, a set of evaluation indexes for profile control effect of water shutoff in ultra-low permeability reservoirs has been formed, and the injection quantity and mode of profile control agent have been optimized, which can provide technical support for the evaluation effect of oilfield.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357

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