【作者】 张俊杰；

【导师】 闫长辉；

【作者基本信息】 成都理工大学 ， 油气田开发工程， 2010， 硕士

【摘要】 现代油藏精细描述技术的发展,使得我们能更深入地认识油藏;复杂井技术的不断应用,使传统的井网部署方法发生变化。传统的面积井网理论已不适合现代油田开发技术的发展。为此刘德华等人于2004年提出以油藏描述为基础,最大限度控制储量为前提,提高单井效益为目的的矢量化井网的概念。矢量化井网是建立在地质矢量化之上的一种综合布井方式,综合考虑多种因素后达到合理开发油藏的目的。随着水平井开发的进一步广泛应用,针对水平井的矢量化井网研究变得更加重要,矢量化井网这一概念提出时,包含了水平井与地质情况相适应性,但水平井水平段合理延伸方向、水平井最佳井排方向等问题及其如何在具体油藏中结合实际各种地质因素,都是亟待解决的问题。井网矢量与地质矢量的协调是矢量井网设计的基本原则。对于底水砂岩油藏,矢量化井网部署应立足于油藏的构造形态、沉积过程中的物源方向和油藏非均质性,合理设计水平井段方向和水平井井排方向,并且应考虑水平井最佳避水高度以及对于油藏中不同井型的合理选择。本文以油藏精细描述为基础,结合塔河一区的实际地质情况,建立了考虑不同因素的理想模型,量化地讨论不同因素对水平段方向及水平井井排方向的影响,研究了矢量化井网中最佳水平段方向和最佳水平井井排方向。在底水砂岩油藏实际开发中,避水高度是影响底水锥进速度和无水采油期的重要因素之一,通过计算不同底水能量的理想地质模型,认为水平井段应该尽量靠近油藏上部;在获得同等经济效益的情况下选择合理的井型有利于减少油藏的开发投资,通过对比分析塔河一区油藏地质情况类似的水平井和直井的生产动态特征,认为合理的井型选择应该结合塔河一区构造特征。文中对矢量化井网部署中应考虑的因素及其对井网的影响做了量化的研究和相关讨论,还需要结合实际油藏对此进行一定验证。通过对塔河一区的矢量化井网及现有井网与矢量化井网对比,发现在同样的投资条件下,矢量化井网有助于控制含水上升和提高采出程度,相对于塔河一区现有井网,矢量化井网更能提高经济效益;塔河一区目前井网控制程度不足,在下步井网部署中应结合矢量化井网部署方法进行调整,本文结合矢量化井网部署原则,针对塔河一区目前的开发情况,设计了一套下步井网调整方案,通过数值模拟预测,认为采用矢量化井网进行下步井网调整可以获得较好的效益。更多还原

【Abstract】 Development of Modern Detailed Reservoir Description technology has enabled us to understand the reservoir better. The traditional arrangements of well patterns have changed with the application of complex wells technology. The traditional well pattern theory is not suitable for development of modern oil field exploitation technology. For this reason Liu-Dehua and others proposed the concept of vector pattern of well-net in 2004 which is based on reservoir description, the premise of maximum control of reserves, and is for the purpose of improving single oil well production. Vector well pattern is an integrated well spacing method based on the geological vector, of which purpose is to determine reasonable development mode in consideration with various factors. With the wide use of horizontal wells for oil and gas development, the study of vector well pattern for horizontal wells have become more and more important. When the concept of vector well pattern was firstly introduced, the horizontal well and the geological situation ought to be both considered about. But the logical extension of horizontal direction in horizontal wells, best direction of horizontal wells row and the combination of the various geological factors in specific reservoirs are problems that need to be answered.Coordination of well vector and geological vector is the basic principles of vectorial well design. For sandstone oil reservoir with bottom-water, the deployment of vector wells should be based on reservoir structure and morphology, sediment source direction in the process and reservoir heterogeneity, the direction of horizontal-section well and horizontal wells arrangement should be reasonably designed, and the best standoff of horizontal wells should been carefully considered as well as the rational choice for different types of wells in reservoir be made. In this paper on the basis of detailed reservoir description and in combined with the actual geological conditions of 1st Block of Tahe Oilfield, an ideal model is established considering with various factors, quantitative discussions of the different factors affecting the direction of horizontal-section well and horizontal well array are made, and the best direction of horizontal-section well and horizontal well array of vectorial wells are determined.In the actual development of sandstone oil reservoir with bottom-water standoff, the height of water avoidance is one of the important factors to affect the velocity of bottom water coning and water-free production period. According to the calculation of ideal geological model with different bottom water energy, the result shows that the horizontal well should be as close as possible to the upper reservoir. The reasonable selection of well-type is conducive to reduce reservoir development investment under the circumstances of obtaining equal economic benefits. Through a comparative analysis on production performance of horizontal and vertical wells in 1st Block of Tahe oilfield with similar reservoir geology situation, it is believed that reasonable well-type selection should be considered with the actual construction of 1st Block of Tahe Oilfield.The quantified research and related discussions are made about factors that need to be considered in vectorial well arrangement and their impacts on well-net, and the conclusions need to be verified by specific reservoirs. Through design of vector well-net and contrast between existing well-net and vector well-net in 1st Block of Tahe Oilfield, we have found that under the same investment conditions, vector well-net helps to control water-content rise and increase recovery percent, that is, vector wells enhance economic performance better than the existing well-net in 1st Block of Tahe Oilfield. Now control degree of well-net in 1st Block of Tahe Oilfield is not sufficient, so in the next step well-net arrangement should be conducted with vectorial well arrangement methods. In this paper integrated the principle of vectorial well arrangement, a next-step well-net adjustment program is designed. According to numerical simulation prediction results, it is believed that the use of Vector Well-net helps to achieve better beneficial results in next-step well-net adjustment.更多还原