武威盆地煤层气特殊工艺井适应性研究

发布时间：2018-04-23 10:41

本文选题：武威盆地 + 特殊工艺井　；参考：《西南石油大学》2015年硕士论文

【摘要】：武威盆地煤层气勘探开发刚起步,目前煤层气资源勘探工程地质认识程度低,尚未开展煤岩力学性能研究,煤层物性与力学特性认识不足,适合武威盆地煤层的开发不明确。因此开展特殊工艺井适应性研究与优化,完成煤岩力学性能测试研究工作,为形成石炭系特殊工艺井配套技术提供理论支撑。本文通过煤岩岩石力学实验,结合地质特性研究井壁失稳；分析特殊工艺井在岩石力学参数、物性参数、地质特征方面的适应性。文章以武威盆地石炭系太原组煤层为研究目标,针对煤层地质特性、岩石力学参数、物性参数、井壁稳定性等方面进行系统研究,建立物理和数学模型。结合己钻井数据,综合优化出了适合武威盆地煤层气特殊工艺井井眼轨迹。文章主要研究工作和成果如下： (1)岩石力学特征分析与评价。通过岩石力学实验,获得了储层的岩石强度参数、弹性参数,抗张强度,纵横波速等。从岩石力学参数来分析,该区基本适合特殊工艺井,也为分析井壁稳定性提供基础参数； (2)对武威盆地特殊工艺井地质条件分析,该工区构造简单,断层较少,地层平缓,属于低孔隙度、低渗透率煤储层,有微裂纹和割理发育等。这些条件都满足特殊工艺井的开发要求,综合来看,武威盆地属于特殊工艺井开发比较适合的地区。对物性参数的测井解释,也为优化特殊工艺井井眼参数提供基础参数。 (3)根据测井资料解释(W-1井、W-2井)岩石力学参数,由地质特征优选地应力计算模型,计算了不同井眼轨迹参数下井壁围岩应力强度的差异,通过对三压力剖面的分析。研究区钻井液密度窗口宽,适合特殊工艺井开发,对坍塌压力和破裂压力的分析得出研究区适合打水平井以及适合的方位。为优化适合研究区的井眼轨迹提供参数。 (4)通过数学模型优化特殊工艺井参数,基于优选的最佳水平井眼方位,结合相关设计原则,优化设计出适合研究区的特殊工艺井(U型井或多分支水平井)井眼轨迹,并优选出适合的井型。
[Abstract]:The exploration and development of coal-bed methane in Wuwei Basin is just beginning, the degree of engineering geological understanding of exploration of coal-bed methane resources is low at present, the study on the mechanical properties of coal and rock has not been carried out, and the understanding of physical and mechanical properties of coal seam is insufficient, which is not clear enough for the development of coal seam in Wuwei Basin. Therefore, the research and optimization of adaptability of special process wells are carried out, and the testing work of mechanical properties of coal and rock is completed, which provides theoretical support for forming the matching technology of Carboniferous special process wells. In this paper, through coal rock and rock mechanics experiments, combined with geological characteristics, the shaft wall instability is studied, and the adaptability of special craft well in rock mechanics parameter, physical property parameter and geological characteristic is analyzed. Taking the coal bed of Taiyuan formation of Carboniferous system in Wuwei Basin as the research object, this paper systematically studies the geological characteristics of coal seam, rock mechanics parameters, physical property parameters and wellbore stability, and establishes physical and mathematical models. Based on the drilling data, the borehole trajectory suitable for the special process of coal bed methane in Wuwei Basin was optimized. The main research work and results are as follows: Analysis and evaluation of rock mechanics characteristics. The rock strength parameters, elastic parameters, tensile strength, longitudinal and transverse wave velocities were obtained by rock mechanics experiments. According to the rock mechanics parameters, this area is basically suitable for special process wells, and also provides basic parameters for the analysis of wellbore stability. 2) according to the analysis of the geological conditions of the special process wells in Wuwei Basin, this area is characterized by simple structure, few faults, gentle formation, low porosity, low permeability coal reservoir, microcrack and cleat development. All these conditions meet the development requirements of special process wells. In a word, Wuwei Basin is a suitable area for the development of special craft wells. The logging interpretation of physical parameters also provides the basic parameters for optimizing the borehole parameters of special process. According to the logging data, the rock mechanics parameters are interpreted. The stress intensity difference of wall rock under different borehole trajectory parameters is calculated according to the geological characteristics, and the stress intensity difference of surrounding rock is calculated by analyzing the three pressure profiles. The drilling fluid density window in the study area is wide, which is suitable for the development of special process wells. The analysis of collapse pressure and fracture pressure shows that the study area is suitable for horizontal wells and azimuth. The parameters are provided for optimizing the borehole trajectory suitable for the study area. 4) optimizing the parameters of special process wells by mathematical model, based on the optimum hole orientation of horizontal wells, combining with relevant design principles, optimizing and designing the hole trajectory of special process wells with U-shaped or multi-branch horizontal wells suitable for the study area. And the suitable well type is selected.
【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】：TE37

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