南海高温高压区块地层三压力特性研究

发布时间：2018-10-18 17:25

【摘要】：随着油气勘探开发的不断深入,勘探开发区域构造活动愈来愈复杂、深井超深井所占的比率越来越大,油气井钻探过程中钻遇高温高压层位机率呈直线增长态势,也将面临着更为严重的喷、漏、塌、卡等复杂情况。对地层岩石力学特性的充分了解,是有效避免钻井过程中复杂情况发生的必要条件之一。本论文的具体研究内容如下:(1)多孔弹性模型。本论文在原有线弹性理论模型的基础上充分考虑了储层中流-固耦合效应对原地应力场的影响,并以平面应变状态假设为基础,利用广义胡可定律、有效应力定律、弹性Navier理论方程以及线性叠加原理等得到井壁围岩应力分布多孔弹性力学分析模型。(2)室内评价实验。以现场岩心为研究对象,采用岩石力学三轴实验系统、压力传递实验系统、声波测试仪等仪器设备等实验设备分别测试岩心在常温与高温条件下弹性力学参数、强度参数、有效应力系数等基础特征参数,并利用渗透率与孔隙度测试仪探究了岩心的物性参数—渗透率与孔隙度,为后续模型的建立提供基础数据。(3)多因素岩石力学参数测井解释模型。以室内静态岩石力学测试结果与现场测井资料为基础,获取岩石力学参数的敏感因素及其最佳的拟合函数,以遗传算法为数据拟合优化算法,建立岩石静态参数的多因素测井解释模型,并与现有的经验模型进行简要的对比分析。(4)地层压力特性评价。在多孔弹性理论模型与多因素岩石力学参数测井解释模型的基础上,以岩石的强度参数与储层测井、录井等资料为基础,,获取地层全井身三压力值,并依据地层三压力剖面特征,确定异常压力层位,并给出相应的对策。
[Abstract]:With the deepening of oil and gas exploration and development, the tectonic activity in exploration and development area is becoming more and more complicated, and the proportion of deep wells in ultra-deep wells is increasing more and more. The probability of drilling high temperature and high pressure layers in oil and gas wells is increasing linearly in the process of drilling. Will also face more serious spray, leakage, collapse, card and other complex situation. To fully understand the mechanical properties of formation rock is one of the necessary conditions to avoid the complex situation in drilling process. The main contents of this thesis are as follows: (1) porous elastic model. In this paper, based on the original linear elastic theory model, the effect of fluid-solid coupling effect on the original in-situ stress field is fully considered, and based on the assumption of plane strain state, the generalized Hook's law and the effective stress law are used. The elastic Navier theory equation and the linear superposition principle are used to obtain the porous elastic mechanics analysis model of surrounding rock stress distribution. (2) Indoor evaluation experiment. Taking the field core as the research object, the parameters of elastic mechanics and strength of rock core under normal and high temperature conditions were measured by means of triaxial experimental system of rock mechanics, pressure transfer experiment system, acoustic wave tester and so on. The effective stress coefficient and other basic characteristic parameters are studied by using permeability and porosity tester, which provides the basic data for the subsequent establishment of the model. (3) the logging interpretation model of multi-factor rock mechanics parameters. Based on indoor static rock mechanics test results and field logging data, the sensitive factors of rock mechanics parameters and their best fitting functions are obtained. Genetic algorithm is used as the data fitting optimization algorithm. The multi-factor log interpretation model of rock static parameters is established and compared with the existing empirical model. (4) Evaluation of formation pressure characteristics. On the basis of the porous elastic theory model and the logging interpretation model of multi-factor rock mechanics parameters, based on the data of rock strength parameters and reservoir logging and logging, the three pressure values of the whole well are obtained. According to the characteristics of formation three pressure profile, the abnormal pressure layer is determined, and the corresponding countermeasures are given.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE311

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