新疆H6井区克下组稠油开发效果究评价及政策调整

发布时间：2019-03-22 11:39

【摘要】：新疆H6井区克下组为受逆断裂切割的复杂断块的稠油油藏,其沉积环境属山麓洪积相,油层具有埋藏浅,厚度变化大,非均质性严重等特征。自2013年全面投产以来,克下组油藏采用蒸汽吞吐方式开采,平均轮次4轮,油气比仅为0.24,综合含水72.96%。针对研究区各井产量差异大,递减迅速,蒸汽能量利用率低等问题,从地质特征、原油性质、注采参数3方面采用灰色关联法确定影响产能的主要因素,并提出综合岩性指数概念,对目前开发效果进行综合评价;通过典型井组数值模拟研究,分析了剩余油的成因及分布规律;综合开发效果评价和剩余油研究,从射孔补层、注采参数优化、转蒸汽驱可行性等方面提出了相应的调整措施。研究表明:H6井区克下组油藏投产一年即进入产量递减阶段,油层压力水平较高,预测油藏采收率19.23%,亟需改善开发效果,提高原油采收率;影响产能的最主要因素是岩性,其次为射开油层厚度和含油饱和度,拟采用完善射孔等措施提高动用程度;研究区剩余油为当前吞吐参数未动用的井间剩余油,其主要受控于储层物性;通过全区筛选与详细井点论证,本区不适合转蒸汽驱开发,应立足蒸汽吞吐开采技术,优化注采参数;数值模拟结果表明,油藏每轮次吞吐参数上提20%～30%,优化后油藏预测采收率达到23.63%,较当前技术政策采收率上提4.40%,效果较好。
[Abstract]:The sedimentary environment of the heavy oil reservoir of the complex fault block, which is subject to the reverse-fracture cutting, is characterized by shallow burial, large variation of thickness and serious heterogeneity of the oil layer. Since the full operation in 2013, the oil reservoir in the lower group is developed by steam stimulation, the average wheel is four wheels, the oil-gas ratio is only 0.24, and the comprehensive water content is 72.96%. In view of the problems of large production difference, rapid decline and low utilization of steam energy in each well in the research area, the main factors influencing the production capacity are determined from the geological characteristics, the crude oil properties and the injection and production parameters 3, and the concept of the comprehensive lithology index is put forward. Based on the numerical simulation of the typical well group, the cause and distribution of the residual oil are analyzed, the comprehensive development effect evaluation and the residual oil research are carried out, and the result is optimized from the perforation compensation layer and the injection extraction parameter. The corresponding adjustment measures are put forward in such aspects as the feasibility of steam drive. The results show that the oil reservoir is put into production for one year, and the pressure level of the oil layer is higher and the recovery factor of the reservoir is 19.23%. It is urgent to improve the development effect and improve the recovery factor of the crude oil. The most important factor affecting the production capacity is the lithology, secondly, the thickness and the oil saturation of the oil-jet oil layer are shot, and the utilization degree of the measures such as perforation and the like is to be improved; the residual oil in the study area is the residual oil between the wells which are not used by the current stimulation parameters, and is mainly controlled by the physical property of the reservoir; and through the whole region selection and detailed well point demonstration, It is not suitable for the development of rotary steam drive, and the injection and production parameters should be optimized based on the steam huff and puff technology. The numerical simulation results show that the oil reservoir can be raised by 20% ~ 30% on each cycle of the stimulation parameter, and the oil recovery ratio of the optimized oil reservoir reaches 23.63%, and the recovery efficiency of the current technology is 4.40%, and the effect is good.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE345

【相似文献】