水驱油藏剩余油微观分布模拟研究
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摘要
杏十~十二区目前的生产状况表明,该区块虽然进行了两次加密调整,但是在现有注采条件下,仍然有较高的潜力可挖;薄差层和表外储层动用程度仍然不高。寻找剩余油,合理的开采剩余油是目前面临的主要任务之一。本文从微观研究入手结合宏观资料对区块的剩余油微观分布类型、分布形态、形成机理以及在薄差和表外储层中的分布进行了研究。
     在微观研究方面,对微观物理模拟作了改进,研制了能够替代真实油水可以在某一温度下在岩心中同时固结,粘结牢固,互不影响的模拟油和模拟水,进行微观驱替,使得模拟效果更接近或达到真实地层条件下的剩余油微观分布形态。利用微观物理模拟技术系统的研究了水驱、聚合物驱和三元复合驱后,剩余油在岩心中的分布形态,并进行了相互比较。结合玻璃填砂模型,揭示了影响剩余油饱和度和分布形态的因素,探讨了剩余油微观形成机理,指出了不同物性岩心,在驱替后剩余油分布的主要形态。
     由于目前主要对区块中的薄差层和表外储层进行挖潜,因此对薄差层和表外储层的物性和开发特点进行了研究,研究表明本区块差层和表外储层在目前的井网下由于井距较大,动用不好,需要加密调整。但由于含油饱和度的差异,三次加密调整区域受到一定限制,同时油价也制约着三次加密调整的范围。
     利用检查井密闭取心资料、测井资料、生产动态资料,研究了研究区块剩余油富集区。针对不同剩余油分布类型采用不同的方式进行挖潜。对于大面积分布、较为集中的剩余油进行三次加密调整,并给出了加密调整方案,优选出了适合本区的加密方案。对于好的储层剩余油分布比较零散不适合加密,主要采用三次采油挖潜。
     本文的研究对于微观物理模拟的改进、对微观物理模拟的发展有较大的促进意义。
At present, the Xing10~12 section production condition indicates, although the well net consistency has been increased two times in the this section, under th production condition condition, the reservoir still has the high potential. The thin, the bad and outside the table reservoirs used degree are not still high. At present, seeking the residual oil, the reasonable extracting of residual oil is one of primary problem. Begins from the microexamination, with main macroscopic material, the article has studied the section residual oil microscopic distribution type, the distribution shape, formed residual oil the mechanism as well as in the thin ,the bad and outside the table reservoirs' distribution
     In the microexamination aspect, the microphysics mold has been improved. The simulation oil and the simulation water have been developed. They are able to substitute the real oil and reservoir's water. They can solidify under some temperature in the core sample. The concretion is reliable and do not affect mutually. after the simulation water deplace the simulation oil in the core sample, the residula simulation oil in the core sample shape is closer to or achieve the residual oil microscopic distributed shape of the reservoir condition. Used the microphysics simulation technology systemically research the residual oil microscopic distributed shape afetr the water, the polymer and the ASP deplace the oil. The deverse residual oil in core sample distributed shape has been mutually compared. Used the glass fills in the sand mold open out the influence residual oil saturation's and the distribution shape's factors. It is discussed the residual oil microscopically to form the mechanism. It is pointed out the residual oil distribution main shape after the displacement, in the different natural core sample.
     At present, the futher extraction of oil carry on in the thin, bad and outside the table resevoirs. Therefore the reservoirs of the thin, bad and outside the table nature and the development characteristic have been studied. The research indicates the bad and outside the table reservoirs, under the present wells net, as a result of the wells distance, are not used well. The wells net need adjustment. Simultaneously, the oil price is also restricting to adjustment area.
     used the inspection well to take the core material, the log information and the production performance material have research the residual oil concentrates the area. In view of the different residual oil distribution type, selects the different method carry on the futher extraction of oil. The third wells net's adjustments suit the residual oil of the distribution center. Selection a plan suits the section from given the adjustment plans. Regarding the good reservoir residual oil distribution is scattered, used the polymer displace oil.
     This article research has the promotion significance to the microphysics simulation development.
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