中区东部高台子油层层系井网调整与效果评价

发布时间：2018-08-12 20:51

【摘要】：本文针对萨中开发区多套层系、多套井网共同开发进行研。目前研究区已进入特高含水后期开发阶段。各区块水驱层系每套井网均有各自的开采层系及开采对象,同层系内各沉积单元油层发育状况差异较大。因此,同层系不同井网间布井方式、注采井距、射孔状况均不相同,致使各层系井网注采系统还不完善,有些油层的水驱控制程度还较低。因此对层系井网优化调整技术进行研究,找到满足现阶段高效开发的层系井网调整方式,以及适合中长期开发的层系井网调整方向。其次根据研究区油藏地质特点以及开发现状,利用Petrel软件对研究区进行精细地质建模,建立构造模型、沉积相模型和孔渗饱等属性模型。纵向上,每个沉积单元作为一个模拟层,共有92个层,平面上步长为20m×20m,总网格数为102.45×104个。对研究区储量进行拟合,为后续井网调整提供物质基础。利用Eclipse数值模拟软件进行了数值模拟研究,对全区592口井的产液量、含水率、注水量等指标进行历史拟合。对研究区各沉积单元的剩余油饱和度场以及调整前期的剩余油分布规律进行研究。总体上,主力油层累产油量较少,剩余储量仍然比较大,仍有相当的挖潜潜力,为井网调整提供物质基础。基于油藏工程、数值模拟方法以及经济评价理论,计算出层系井网经济技术界限,结果表明(1)在单井完钻井费用为230万元,原油价格为40美元/桶时的可采储量下限为6299.79t,井距为250m时,单井有效厚度下限2.69m,井距为125m单井有效厚度下限10.76m,井距为300m单井有效厚度下限为1.87m。(2)渗透率级差控制在3.5-4.5以内。(3)饱和度级差控制在1.1-1.12以内。(4)同一层系内油层数控制在10-20以内。(5)生产井跨度应该小于100m,才能有效的减小生产井段跨度带来的干扰。基于层系重组界限的研究成果,设计层系重组以及井网重构的方案,层系重组方案,GI1-20层系,开采GI所有油层。GII1-26以下层系,开采GI18以下油层。GII27-GIV18,开采GII部分油层以及GIII、GIV所有油层。设计的井网重构方案,GI1-GI20层系、GII1-GII26层系采用300m井距反九点法井网,GII27及以下层系调整为106m井距的五点法井网。布署总井数为592口,其中新钻井409口。新钻井共需要压裂87口,酸化10口,并对调整方案进行开发效果评价与预测。通过本文的研究确定了一套适合萨中开发区中区东部高台子油层层系组合的界限并设计出一套适合其开发的井网部署方案,对于萨中开发区高台子油层有效开发具有一定意义。
[Abstract]:This paper aims at the development of multi-layer system and multi-set well pattern in Sazhong Development Zone. At present, the research area has entered the stage of development in the late stage of super high water cut. Each set of well pattern has its own production system and exploitation object in each block, and the reservoir development of each sedimentary unit in the same layer system is quite different. Therefore, different well patterns, injection / production spacing and perforation conditions are different in the same layer system, resulting in imperfect injection-production system and low water drive control degree in some reservoirs. Therefore, the optimization and adjustment technology of well pattern is studied to find out the adjustment mode of well pattern for high efficiency development at present, and the adjustment direction of well pattern suitable for medium and long term development. Secondly, according to the geological characteristics of reservoir and the present situation of development in the study area, the fine geological model of the study area is established by using Petrel software, and the attribute models such as structural model, sedimentary facies model and pore and permeability saturation are established. Longitudinally, each sedimentary unit acts as an analog layer, with 92 layers. The step size on the plane is 20m 脳 20m, and the total mesh number is 102.45 脳 104. The reserve of the study area is fitted to provide the material basis for the subsequent well pattern adjustment. The Eclipse numerical simulation software was used to simulate the fluid production, water cut and water injection rate of 592 wells in the whole area. The remaining oil saturation field of each sedimentary unit in the study area and the remaining oil distribution in the early stage of adjustment were studied. On the whole, the accumulated oil production of the main reservoir is relatively small, the remaining reserves are still relatively large, and there is still considerable potential for tapping potential, which provides the material basis for well pattern adjustment. Based on reservoir engineering, numerical simulation method and economic evaluation theory, the economic and technical limits of well pattern are calculated. The results show that: (1) the drilling cost of single well is 2.3 million yuan. The lower limit of recoverable reserves is 6299.79 t when the price of crude oil is 40 US dollars / barrel, and the well spacing is 250 m. The effective thickness lower limit of single well is 2.69 m, well spacing is 125m, effective thickness limit of single well is 10.76 m, and effective thickness limit of single well is 1.87 m. (2) permeability difference is controlled within 3.5-4.5. (3) saturation difference is controlled within 1.1-1.12. (4) the number of oil layers in the same series is controlled. (5) the span of production well should be less than 100m, which can effectively reduce the interference caused by the span of production well. Based on the results of the research on the boundary of the series recombination, the author designs the scheme of the series recombination and well pattern reconstruction. The plan of the series reorganization is the GI1-20 series, the production of all the layers. GII1-26 of GI, the production of the oil layer. GII27-GIV18 below GI18, the production of some oil layers of GII and all the oil layers of GIIII-GIV. The GI1-GI20 system of GI1-GII26 is designed to adopt the five-spot well pattern with 300m interval in reverse nine-spot well pattern GII27 and below 106m well spacing. The total number of wells deployed was 592, of which 409 were new drilling. A total of 87 fracturing and 10 acidizing wells are needed for new drilling, and the development effect of the adjustment scheme is evaluated and forecasted. Through the study of this paper, a set of limits suitable for the combination of Gaotaizi oil series in the eastern part of Sazhong Development Zone is determined and a set of well pattern deployment scheme suitable for its development is designed, which is of certain significance for the effective development of the Gaotaizi Reservoir in the Sazhong Development Zone.
【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】：TE324

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