川南页岩气示范区气体钻井适用性评价及应用研究

发布时间：2018-04-14 04:03

  本文选题：气体钻井 + 井壁稳定性分析　； 参考：《东北石油大学》2017年硕士论文

【摘要】：川南昭通页岩示范区的天然气储层具有硬度大、研磨性强、可钻性差、漏层多的特征,造成该地区钻井过程中钻速慢、钻井周期长、钻井成本高,气体钻井技术的应用能够极大的提高机械钻速,解决上述问题。然而并非所有的地层条件和油藏类型适用气体钻井技术,地层出水、出气以及井壁坍塌情况的出现都有可能导致严重的气体钻井事故,使气体钻井难以达到预期的效果。本文基于地质、钻井、测录井等资料,全面掌握昭通页岩示范区块的地质构造特征,为气体钻井适应性评价研究提供必要的地质依据。综合分析地层压力分布特征、地层岩性及地层出水、出气特征对气体钻井的影响,结合工区地层特征,对该区气体钻井地层进行了适应性评价。开展研究区块岩石力学参数分析,建立该地区的地应力模型和纵向连续地层孔隙压力剖面,总结分布其分布规律的基础上,建立气体钻井井壁稳定预测模型,完成昭通页岩示范区块气体钻井井壁稳定性分析。根据建立地层出水计算模型,根据测井数据判断出水层位,并采用声波时差和双侧向电阻数据结合的方法预测出水层位,引用渗流力学原理建立地层出水量计算模型。建立岩石可钻性与岩石力学参数之间的关系模型,结合研究区块的现场数据,建立该区块地层的可钻性剖面,并通过可钻性级值的改变判断出在该区块采用气体钻井具有提速潜力。本文针对昭通页岩示范区开展了有关气体钻井适用性方面的研究,在常规过程中出现的井壁掉块问题,井漏,卡钻等问题,在气体钻井中都可以通过选用空气锤和牙轮钻头,控制井底压力等方法有效避免。为川南地区这种岩性复杂,地层可钻性差的页岩气井施工提供了理论支持,保证气体钻井更好地发挥其优势,最大限度的保证气体钻井的施工安全,提高经济效益。
[Abstract]:The natural gas reservoir in Zhaotong Shale demonstration area in southern Sichuan is characterized by high hardness, strong abrasive, poor drillability and many leaking layers, which results in slow drilling speed, long drilling period and high drilling cost in this area.The application of gas drilling technology can greatly improve the mechanical drilling speed and solve the above problems.However, not all formation conditions and reservoir types are suitable for gas drilling technology. The emergence of formation water, gas and wellbore collapse may lead to serious gas drilling accidents, which makes gas drilling difficult to achieve the desired results.Based on the geological, drilling and logging data, this paper comprehensively grasps the geological structure characteristics of Zhaotong Shale demonstration area, and provides the necessary geological basis for the study of gas drilling adaptability evaluation.The influence of formation pressure distribution, formation lithology, formation effluent and gas outgassing on gas drilling is comprehensively analyzed. Combined with the formation characteristics of the working area, the adaptability evaluation of gas drilling formation in this area is carried out.Based on the analysis of rock mechanics parameters in the study block, the in-situ stress model and the vertical continuous formation pore pressure profile are established, and on the basis of the distribution law, the prediction model of gas drilling sidewall stability is established.The stability analysis of block gas drilling sidewall in Zhaotong Shale demonstration area is completed.According to the formation effluent calculation model and the logging data, the water layer is determined, and the method of combining acoustic time difference and dual lateral resistance data is used to predict the effluent layer, and the seepage mechanics principle is used to establish the formation water output calculation model.The relationship model between rock drillability and rock mechanics parameters is established, and the drillability profile of the formation of the block is established by combining the field data of the study block.According to the change of drillability grade, it is concluded that gas drilling has the potential of increasing speed in this block.In this paper, the applicability of gas drilling in Zhaotong Shale demonstration area has been studied. In the conventional process, the problems such as block loss of wellbore, well leakage, drilling jam and so on can be solved by selecting air hammer and cone bit in gas drilling.Control of bottom-hole pressure and other methods to effectively avoid.It provides theoretical support for the construction of shale gas wells with complex lithology and poor formation drillability, ensures that gas drilling can play its advantages better, ensures the safety of gas drilling to the maximum extent, and improves economic benefits.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE24
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本文编号：1747604