底水油藏双水平井完井控水研究

发布时间：2018-07-12 21:27

本文选题：双水平井完井 + 稳态耦合　；参考：《西南石油大学》2015年硕士论文

【摘要】：水平井开发底水油藏面临的最大问题就是底水脊进,底水脊进使油井过早见水、产量骤减和含水快速上升,并导致水处理费用增加和开发成本升高。因此底水油藏开发的关键技术是抑制底水锥／脊进和控制底水均匀驱替,最大程度的延长油井无水采油期以达到提高底水油藏开发效果的目的。为降低含水率的增长速度,恢复和提高油井产量,开展双水平井排水采油控制底水锥进技术的研究将从根本上解决底水锥进,为强底水油藏的高效快速开发提供新的开发思路和开发方法。本文在调研大量文献的基础上,采用半解析方法对双水平井完井产能预测及其影响因素的影响规律进行研究。首先,根据镜像反映原理和压降叠加原理,采用点源函数法建立了底水油藏双水平井完井的油藏渗流模型；根据近井筒渗流特征建立了近井筒入流模型；根据生产段变质量流特征建立了井筒压降模型；考虑油藏各向异性、渗流干扰、井筒管流压降、钻完井污染等因素,再将三者关联建立了其产能预测耦合模型,给出求解方法并编制了相应程序。得到底水油藏双水平井完井方式下,沿上水平井井筒的流率分布和井底流压分布,并分析了油藏地质特征参数和排采工艺参数对双水平井完井产能的影响。然后,通过分析水平井底水脊进机理及其二维、三维模型,建立双水平井完井底水脊进的三维模型,求解出双水平井完井时的底水突破时间与水脊突破高度,并分析了不同原油粘度、各向异性、避水高度、采水井位置和生产压差对其产生的影响。结果表明：采油井筒越靠近油层顶部,底水突破时间越长,且随着水平井筒向上移动,底水突破时间增加得越快；随着kh/kv比值的增加,底水突破时间减小。最后,利用底水油藏双水平井完井产能模型和三维底水脊进模型,以累积无水产油量为目标函数,优化排采参数,选出最佳控水采油方案。结果表明：采水井长度需要优化,存在最佳长度；采水井在中下部时采水控油效果较好；采水油比的大小不超过1.5控水效果较好。根据具体井的参数,对采水井的长度、位置、采水量进行优化,列举了4种不同的完井方案,最终选出了最佳完井方案。本文的研究成果能为底水油藏对双水平井完井技术的适用性及排采参数优化提供理论基础,指导油田进行双水平井完井设计。
[Abstract]:The biggest problem faced by horizontal well in developing bottom water reservoir is the bottom water ridge advance, which makes the oil well see water prematurely, reduce the production and increase water cut rapidly, and lead to the increase of water treatment cost and development cost. Therefore, the key technology of bottom water reservoir development is to restrain the bottom water cone / ridge flow and to control the uniform displacement of bottom water, so as to extend the oil well water production period to the maximum extent in order to improve the development effect of bottom water reservoir. In order to reduce the growth rate of water cut and to restore and improve the production rate of oil wells, the research on the technology of controlling bottom water coning by drainage oil production in double horizontal wells will fundamentally solve the problem of bottom water coning. It provides a new development idea and method for high efficiency and fast development of strong bottom water reservoir. In this paper, based on the investigation of a large number of literatures, the semi-analytical method is used to study the influence law of dual horizontal well completion productivity prediction and its influencing factors. Firstly, according to the principle of mirror reflection and the principle of pressure drop superposition, the reservoir percolation model of double horizontal well completion in bottom water reservoir is established by using point source function method, and the near wellbore inflow model is established according to the percolation characteristics of near wellbore. According to the characteristics of variable mass flow in production section, the wellbore pressure drop model is established, considering the factors of reservoir anisotropy, percolation interference, wellbore pipe flow pressure drop and well drilling and completion pollution, the coupling model of productivity prediction is established. The solution method is given and the corresponding program is worked out. The flow rate distribution and bottom hole flow pressure distribution along the upper horizontal well under the completion mode of dual horizontal wells in bottom water reservoir are obtained. The effects of reservoir geological characteristics and production discharge parameters on completion productivity of double horizontal wells are analyzed. Then, by analyzing the mechanism of bottom water ridge in horizontal well and its two dimensional and three dimensional models, a three dimensional model of double horizontal well completion bottom water ridge is established, and the breakthrough time of bottom water and the height of water ridge breakthrough during completion of double horizontal well are obtained. The effects of viscosity, anisotropy, water diversion height, well location and production pressure on the crude oil were analyzed. The results show that the closer the well bore is to the top of the reservoir, the longer the breakthrough time of bottom water is, and the faster the breakthrough time of bottom water increases with the horizontal wellbore moving upward, and the less the breakthrough time of bottom water decreases with the increase of kh/kv ratio. Finally, by using the dual horizontal well completion productivity model and three dimensional bottom water ridge feeding model in the bottom water reservoir, taking the cumulative waterless oil production as the objective function, the drainage parameters are optimized and the optimal water-controlled oil recovery scheme is selected. The results show that the length of the well needs to be optimized and the optimum length exists; the water production and oil control effect of the well is better when the production well is in the middle and lower part; the ratio of water to oil is less than 1.5 and the water control effect is better. According to the parameters of the wells, the length, location and water yield of the wells are optimized, four different completion schemes are listed, and the optimal completion schemes are selected. The research results in this paper can provide a theoretical basis for the applicability of the bottom water reservoir to the completion technology of double horizontal wells and the optimization of production discharge parameters, and guide the completion design of dual horizontal wells in oil fields.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE257

【参考文献】