煤层气水平井随钻岩性判识方法研究

发布时间：2018-02-03 01:55

本文关键词： 煤层气水平井地质导向岩性识别随钻测井灰色关联法　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,煤层气的开采在整个天然气领域占据重要地位,而采用水平井技术配合地质导向技术钻井来开采煤层气具有增加有效供给范围、提高导流能力、提高单井产和采出程度等优点。在地质导向过程中,如何实时有效的识别地层岩性是地质导向成功与否的关键。传统的测井岩性解释是凭借经验、规律人工进行的,这就会出现一定的滞后,无法满足地质导向技术要求的实时性,即无法实时地判别地层岩性,同时分析的准确性也得不到保证。进而无法有效控制井眼轨迹,无法保证轨迹在储层中的延伸,严重地影响煤层气的开发效果。因此,岩性的实时解释是至关重要的。本文在广泛调研国内外地质导向钻井技术和岩性随钻识别方法的基础上,开展了较为详细的研究工作,提出了一种基于灰色关联理论的地质导向钻井过程中的岩性随钻识别方法。其主旨思想是利用平均值理论对测井数据样本进行分类,可以建立标准测井相——岩相模式,然后利用该标准对随钻测井数据进行灰色关联分析,便可以实现对待识别对象的随钻岩性识别。基于上述理论,本文研究形成了基于随钻测井数据的岩性随钻识别方法,建立了水平井地质导向岩性随钻识别的数学模型。在此模型基础上,以VB6.0为编程工具开发了煤层气水平井地质导向岩性随钻识别的软件。由于计算机的准确性、识别速度快、推广应用方便等优点,这就满足了地质导向中岩性解释的实时性和现场推广应用的问题。通过实验数据验证,该软件的解释结果与现场录井结果较为吻合,其岩性识别率达85%,应用效果良好。
[Abstract]:At present, the exploitation of coalbed methane plays an important role in the whole natural gas field, and the use of horizontal well technology combined with geological guidance technology to drill to mine coalbed methane has increased the effective supply range and improved the conductivity. In the process of geological guidance, how to identify formation lithology in real time and effectively is the key to the success of geological guidance. The traditional interpretation of logging lithology depends on experience. The rule of artificial, this will appear a certain lag, can not meet the real-time requirements of geological guidance technology, that is, can not be real-time identification of strata lithology. At the same time, the accuracy of the analysis can not be guaranteed, and then can not effectively control the wellbore trajectory, can not guarantee the extension of the trajectory in the reservoir, seriously affect the development of coalbed methane. The real-time interpretation of lithology is very important. Based on the extensive investigation of geological steering drilling technology and lithology while drilling identification methods at home and abroad, this paper carried out more detailed research work. In this paper, a method of lithology while drilling identification in geological steering drilling based on grey correlation theory is proposed. The main idea is to classify logging data samples by using the mean value theory. The standard logging facies lithofacies pattern can be established, and then the grey correlation analysis of log data while drilling can be carried out by using this standard, and the recognition of lithology while drilling can be realized based on the above theory. In this paper, a method of lithology while drilling recognition based on logging data while drilling is developed, and a mathematical model of geological guidance lithology while drilling recognition in horizontal wells is established. Using VB6.0 as a programming tool, a software for recognizing geological guiding lithology of coalbed methane horizontal wells is developed. Due to the accuracy of computer, the recognition speed is fast, and it is easy to be popularized and applied. This satisfies the real time problem of lithology interpretation in geological guidance and the problem of field application. The result of the software is in good agreement with the field logging result, and the lithologic recognition rate is 85%. The application effect is good.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD842

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