渤海绥中36油田短半径侧钻增产关键技术研究

发布时间：2018-08-08 13:55

【摘要】：短半径侧钻水平井增产技术是老井恢复产能、老油田挖潜增效的经济有效手段。随着渤海油田勘探开发的不断深入,剩余油分布复杂,井间、层间矛盾不断加剧,部分在生产油田年递减率达到8～10%,并存在海上油田生产井控制储层面积有限的问题。进一步挖潜剩余油,提高油田的产能,又能降低开发成本是渤海油田开发的关键环节。针对海上油田平台井槽数有限且多为定向井和水平井等特征,根据储层物性特征,减少对储层污染,同时满足国家环保法规要求,实现在原井眼中一趟钻套管开窗侧钻并满足短半径井眼轨迹要求,研究了区域构造特征和储层物性特征,攻关了丛式井大斜度高曲率一趟钻侧钻开窗、软地层短半径侧钻钻井工艺、短半径井眼与钻完井管柱刚度适应性设计方法、大曲率小井眼防砂、固井防砂一体化等系列关键技术,融合创新以上的研究成果,集成一套解决绥中36油田开发调整中海上外挂槽口难、生产井控制储层面积有限、开发投资高、产量递减快的适合短半径侧钻增产的技术体系。本文通过在编制渤海绥中36油田短半径侧钻增产方案中,以目前渤海油田开发和老油田调整增产技术为前提,根据其区域地层较为疏松,造斜困难、且短半径轨道造斜段要求高造斜率特点,需要高造斜率和滞后的测量间距,使轨道没有可回旋的余地,需研究马达钻具组合中的近钻头测斜功能,确保钻完井管柱要满足大曲率小井眼的要求,同时保证其刚性、结构必须适应曲率变化。根据区域储层流体性质,基于其周边剩余油分布模式及完善注采井网需求,为满足均衡驱替及注采平衡何后期提液生产要求,研究具有与大曲率小井眼井段匹配的完井防砂工艺,以及固井防砂一体化工艺。应综合钻井、力学、数学与决策论等进行全面规划研究,优化短半径侧钻增产方案,科学实现经济有效挖潜剩余油,最大幅度提高采收率目标。
[Abstract]:The short radius sidetracking horizontal well is an economic and effective means to restore the productivity of the old well and to tap the potential and increase the efficiency of the old oil field. With the deepening of exploration and development in Bohai Oilfield, the distribution of remaining oil is complicated, and the contradiction between wells and layers is becoming more and more serious. The annual decline rate of some oil fields is up to 8% 10%, and the problem of controlling reservoir area of production wells in offshore oil fields is limited. The key link of Bohai oilfield development is to further tap the remaining oil, improve the production capacity and reduce the development cost. In view of the limited number of platform wells in offshore oil fields and their characteristics such as directional wells and horizontal wells, according to the physical characteristics of the reservoir, the pollution to the reservoir is reduced, and the requirements of the national environmental protection laws and regulations are met at the same time. The sidetracking and sidetracking of the casing in the original hole is realized and meets the requirements of the short radius well trajectory. The regional structural characteristics and reservoir physical properties are studied, and the key problems of the cluster well with large slope and high curvature are studied. A series of key technologies, such as short radius sidetracking drilling technology, stiffness adaptability design method of short radius borehole and drilling and completion string, sand control with large curvature and small hole, and integration of cementing and sand control, are integrated with the above research achievements. Integrating a set of technical systems suitable for short radius side drilling to increase production of Suizhong 36 oilfield, such as difficult offshore external slot, limited reservoir area controlled by production wells, high investment in development and fast decline of production. In this paper, based on the present development of Bohai oilfield and the adjustment of production increase technology in old oil field, according to the loose formation in the region, it is difficult to make the slope by compiling the short radius sidetracking stimulation plan of Suizhong 36 oilfield in Bohai Sea. And the short radius track slant section requires the characteristics of high slope making rate, high slope making rate and lag measuring distance, so that the track has no room for gyration, so it is necessary to study the function of measuring deviation of near bit in the motor drilling tool assembly. To ensure that the string of drilling and completion should meet the requirements of small hole with large curvature and its rigidity, the structure must adapt to the change of curvature. According to the fluid property of regional reservoir, based on the distribution pattern of remaining oil and the demand of perfect injection-production pattern, to meet the requirements of balanced displacement and injection-production equilibrium, The completion sand control technology with matching with large curvature and small hole section and the integrated cementing sand control technology are studied. Comprehensive planning and research should be carried out on comprehensive drilling, mechanics, mathematics and decision theory, optimization of short radius sidetracking production plan, scientific realization of economic and effective tapping of remaining oil, and maximum increase in oil recovery.
【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】：TE52

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