元坝须家河组地层漏失机理及防漏堵漏对策研究

发布时间：2018-06-13 10:07

本文选题：元坝地区 + 漏失机理　；参考：《西南石油大学》2017年硕士论文

【摘要】：川东北元坝地区是我国西南地区油气勘探开发的重要区块,其中须家河组储层圈闭资源量高,开发潜力大;同时因地质构造十分复杂,地层破碎、裂缝发育,井漏普遍发生,一次性堵漏成功率低,表现为易漏难堵。井漏所造成的井下复杂事故,严重影响了施工安全和单井综合成本。因此,本文以元坝地区须家河组为研究对象,根据工区钻井、井漏等资料,利用测井计算和实验模拟等手段并结合实际井漏和堵漏案例,研究工区的漏失机理,进而弄清工区防漏堵漏的重点与难点,提出针对性的防漏堵漏对策,主要研究内容和认识如下:(1)收集整理工区钻井与井漏资料,统计工区井漏次数、漏速和堵漏情况,明确工区的井漏特点,根据不同判别依据对漏失类型进行划分,从地质因素和施工因素两方面分析漏失原因;结合钻井资料、录井和测井资料,综合漏层判别方法对漏层位置进行识别,计算漏失通道宽度、走向、渗透率、孔隙度和漏失压力等特征参数,并形成程序便于快速计算,进而明确防漏堵漏工作的重点和难点,为后续高效堵漏材料的实验评价和研究防漏堵漏对策提供依据。(2)利用测井资料的岩石物理信息,根据岩石动态、静态力学参数转换模型,得出工区钻井液安全密度窗口;分析安全密度窗口的影响因素,在此基础上结合已有工区测井资料,建立快速预测工区钻井液安全密度窗口的方法,将常规计算方法、快速预测方法和实钻情况对比,方法结果比较可靠,对指导钻井施工具有一定的意义。(3)目前元坝堵漏作业中综合采用多种堵漏措施,但堵漏一次性成功率偏低,在弄清漏失机理和漏失通道特征的基础上,对南华集团研究院提供的新型高分子固结材料进行了性能实验及评价,结合现场试验情况,得出材料满足工区堵漏要求,可作为工区该层段的高效堵漏材料使用。(4)在漏失机理研究情况和高分子固结材料试验情况的基础上,结合工区井漏和堵漏案例,确定了以合理控制钻井液密度为主的防漏措施和以采用高分子固结堵漏材料快速堵漏为主的堵漏措施,旨在以防漏为主,堵漏为辅,安全高效地治理井漏问题。本文所提出的防漏堵漏对策可以为解决元坝须家河组井漏问题提供依据,其能有效减少井漏次数的发生,且在漏失发生后能迅速找到漏层,快速堵漏,减小井漏的影响,对钻井安全、提高综合效益具有重要意义。
[Abstract]:Yuanba area in northeast Sichuan is an important block for oil and gas exploration and development in southwest China, in which the Xujiahe formation reservoir has a high amount of trap resources and great potential for exploitation, at the same time, because of the very complicated geological structure, the fractured formation, the development of fractures and the widespread occurrence of well leakage, The success rate of one-time plugging is low, which is easy to leak and difficult to plug. The complicated accidents caused by well leakage seriously affect the safety of construction and the comprehensive cost of single well. Therefore, taking Xujiahe formation in Yuanba area as the research object, according to the data of drilling and well leakage in the working area, the leakage mechanism of the working area is studied by means of well logging calculation and experimental simulation and combining with actual well leakage and plugging cases. And then make clear the key points and difficulties of leakage and plugging in the working area, and put forward targeted countermeasures for preventing leakage and plugging. The main research contents and understandings are as follows: 1) collecting and arranging the data of drilling and well leakage in the working area, counting the number of times of well leakage, the leakage rate and the situation of plugging in the working area, The characteristics of well leakage in the working area are clearly defined, the types of leakage are divided according to different discriminant bases, the causes of leakage are analyzed from two aspects of geological factors and construction factors, and combined with drilling data, logging and logging data, The location of leakage layer is identified by comprehensive method of discriminating leakage layer, the characteristic parameters such as width, strike, permeability, porosity and leakage pressure of leakage channel are calculated, and the program is convenient for quick calculation, and the key points and difficulties of leakage prevention and plugging work are determined. This paper provides a basis for the experimental evaluation and study of the leakage and plugging countermeasures of high efficiency plugging materials. (2) according to the rock dynamic and static mechanical parameter conversion model, the safe density window of drilling fluid in the working area is obtained by using the rock physical information of logging data. Based on the analysis of the influencing factors of the safe density window, the method of fast predicting the safe density window of drilling fluid in the working area is established based on the existing well logging data. The conventional calculation method, the fast prediction method and the actual drilling condition are compared. The results of the method are reliable and have a certain significance for guiding drilling construction. At present, a variety of plugging measures are adopted comprehensively in the plugging operation of Yuanba, but the one-time success rate of plugging is on the low side, on the basis of clarifying the leakage mechanism and the characteristics of the leakage passage. The performance experiments and evaluation of the new polymer consolidation materials provided by Nanhua Group Research Institute were carried out. Combined with the field tests, it was concluded that the materials could meet the requirements of leakage plugging in the working area. It can be used as an efficient plugging material in this section of the working area. Based on the study of the leakage mechanism and the experiment of the polymer consolidation materials, combined with the well leakage and plugging cases in the working area, The leakage prevention measures with reasonable control of drilling fluid density and rapid plugging with polymer consolidation material are determined, which aim at preventing leakage, making plugging auxiliary, and treating well leakage problem safely and efficiently. The countermeasures proposed in this paper can provide the basis for solving the well leakage problem in Xujiahe formation of Yuanba, which can effectively reduce the occurrence of well leakage times, and can quickly find the leakage layer after the leakage occurs, so as to reduce the influence of well leakage. It is of great significance for drilling safety and improving comprehensive benefit.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE28

【相似文献】