欠平衡钻井应用适应性评价方法研究

发布时间：2018-08-28 09:38

【摘要】：目前欠平衡钻井技术在国内外取得了较快的发展,其本身的工艺技术和专用装备的进步,使其能够适应各种井型和不同循环流体方式的欠平衡钻井的要求。但是由于欠平衡钻井技术前期应用适应性的评价不够充分,不够系统,致使其应用效果不够理想,严重影响了该项技术的推广应用的范围和规模。所以,开展欠平衡钻井应用适应性评价方法研究是极其必要的。欠平衡钻井应用适应性评价内容主要包括应用可行性和结合经济分析的适应性评价。应用可行性主要是评价地质适应何种欠平衡钻井方式,从地层孔隙压力、地层稳定性和地层流体产出情况三个方面开展评价分析。根据地质条件判断能否选择出合适的欠平衡钻井方式,能否实现安全钻井,进而准确预测出欠平衡钻井对地质条件的适应性。建立了欠平衡钻井提速计算模型和方法,对欠平衡钻井提高机械钻速的效果实现了量化预测评价。建立了欠平衡钻井产能提高计算模型,对后期产能提高进行了量化预测计算评价。为更准确评价欠平衡钻井的效果奠定了理论基础。经济评价,是综合考虑常规钻井和欠平衡钻井的各种成本构成,应用欠平衡钻井钻速提高计算模型和产能提高计算模型,能够计算出欠平衡钻井与常规钻井相比的综合经济效益有多高。通过欠平衡钻井应用可行性评价和经济适用性分析,就可以对预钻井是否适合应用欠平衡钻井技术,适合应用什么类型的欠平衡钻井,以及应用欠平衡钻井会产生多大经济效益做出充分而且系统的评价,为是否开展欠平衡钻井和怎样开展欠平衡钻井做出更加科学的决策。
[Abstract]:At present, underbalanced drilling technology has made rapid development at home and abroad, its own process technology and special equipment progress, make it can adapt to the requirements of various types of wells and different ways of circulation fluid underbalanced drilling. However, due to the inadequate evaluation of the application adaptability of the underbalanced drilling technology in the early stage, the application effect is not satisfactory enough, which seriously affects the scope and scale of the application of the technology. Therefore, it is extremely necessary to study the application adaptability evaluation method of underbalanced drilling. The application adaptability evaluation of underbalanced drilling mainly includes application feasibility and adaptability evaluation combined with economic analysis. The feasibility of the application is mainly to evaluate the underbalanced drilling methods for geological adaptation and to carry out evaluation and analysis from three aspects: formation pore pressure, formation stability and formation fluid production. According to the geological conditions, it is possible to select suitable underbalanced drilling methods, to realize safe drilling, and to accurately predict the adaptability of underbalanced drilling to geological conditions. A calculation model and method for raising the speed of underbalanced drilling is established, and the quantitative prediction and evaluation of the effect of improving the drilling speed of underbalanced drilling are realized. The calculation model of productivity improvement in underbalanced drilling is established, and the quantitative prediction and evaluation of productivity increase in later stage are carried out. It lays a theoretical foundation for more accurate evaluation of the effect of underbalanced drilling. Economic evaluation is a comprehensive consideration of the various cost components of conventional drilling and underbalanced drilling, and the application of the calculation model of improving drilling speed and productivity improvement in underbalanced drilling. It can calculate how high the comprehensive economic benefit of underbalanced drilling is compared with conventional drilling. Through the feasibility evaluation and economic applicability analysis of underbalanced drilling, it is possible to determine whether pre-drilling is suitable for the application of underbalanced drilling technology and what type of underbalanced drilling is suitable. And how much economic benefits will be generated from underbalanced drilling can be fully and systematically evaluated to make more scientific decisions on whether or not to carry out underbalanced drilling and how to carry out underbalanced drilling.
【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】：TE242

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