大庆油田某区块油水分布规律及有效开发方式研究

发布时间：2019-01-26 19:52

【摘要】：A油田该区块含油面积N1km~2,探明未动用地质储量N2×104t。该区块共有井数150口,其中试油井30口,其中有15口获工业油流,3口获低产油流,12口井试油产水。显示具有良好的产油前景,但区块储层发育薄差,试油井产量变化较大,油水关系复杂,而且本区同时存在二维地震资料和三维地震资料,因此为落实研究区构造、储层特征及油水分布规律开展地质特征再认识研究,在此基础上对合理开发方式进行研究。工区北部总体呈西北高东南低的构造格局,断裂较为发育,展布方向多以南北向、北北西向为主,形成的断阶带将工区北部切割为2个相对独立的断块。整体上工区北部油藏类型主要为岩性及断层-岩性油藏,油水界面不统一,整体上含油层系主要分布在构造较高部位,构造低部位油水同层发育。工区南部油藏类型为岩性油藏,油层、差油层以及油水同层均有发育,受岩性控制影响,局部地区PI2层出现水夹层现象。在以上研究成果的基础上进行了有利区预测,在未探明储量区优选出有利含油区。对水平井开发的可行性进行研究,确定PI2、PI4层为水平井开发目的层,水平井段为700m最优,与裂缝方向平行开发效果最好。进行水平井射孔位置研究,得出采用根端和趾端避射方案,避射程度采用两端各130m避射较为合理。通过井网密度计算,经济极限井距为247m;通过井距优化,合理井距为300m;直井部署区选用正方形五点井网,井距为300m、排距150m;水平井部署区井型选用直注平采,同时并采用超前注水的开发方式进行开采。
[Abstract]:The oil-bearing area N _ 1km ~ (2) of this block in A Oilfield is 2, and the proven unproduced geological reserves N _ 2 脳 10 ~ (4) t. There are 150 wells in this block, of which 30 are test wells, of which 15 are industrial oil flows, 3 are low-yield oil flows, and 12 are oil test wells. The results show that there is a good prospect of oil production, but the reservoir development in the block is poor, the production of test wells varies greatly, the oil-water relationship is complex, and there are 2-D seismic data and 3D seismic data in this area, so in order to implement the structure of the study area, The reservoir characteristics and oil-water distribution law are studied on the basis of which the reasonable development mode is studied. In the northern part of the work area, there is a structural pattern of high, southeast and low in the northwest, and the faults are relatively developed, and the distribution direction is mainly from the north to the north, and the fault terrace is formed, which cuts the northern part of the work area into two relatively independent fault blocks. The reservoir types in the northern part of the whole area are mainly lithology and fault-lithologic reservoir, the oil-water interface is not uniform, the whole oil-bearing layer is mainly distributed in the higher part of the structure, and the oil-water layer is developed in the low part of the structure. The types of reservoirs in the southern part of the area are lithologic reservoirs, oil layers, differential reservoirs and the same oil and water layers, which are controlled by lithology, and water intercalation occurs in local PI2 layers. Based on the above research results, the favorable zone is predicted and the favorable oil bearing area is selected from the unproved reserve area. The feasibility of horizontal well development is studied. It is determined that PI2,PI4 layer is the target layer for horizontal well development, and the horizontal well section is 700m optimal, and parallel to fracture direction is the best. By studying the perforation position of horizontal well, it is concluded that it is more reasonable to adopt the method of avoiding fire at the root end and the toe end, and the degree of avoidance is 130m at both ends. By calculating the density of well pattern, the economic limit well spacing is 247m, the reasonable well spacing is 300m through well spacing optimization, the square five-spot well pattern is used in the deployment area of vertical wells, the well spacing is 300m, and the spacing is 150m. In horizontal well deployment area, straight injection and horizontal production are selected, and advanced water injection is adopted for exploitation.
【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】：P618.13;TE34

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