【作者】 周存虎；

【导师】 陈程；

【作者基本信息】 中国地质大学（北京） ， 油气田开发工程， 2011， 硕士

【摘要】 杏一～三区经过40多年注水开发,与原始地层压力相比,分布规律发生了极大的变化,具有纵向剖面上异常高压层和低压层并存、局部井区形成异常高压区的特点。如果地层压力预测不准确,就不能设计合理的钻井液密度,从而容易在钻井生产中发生各类钻井复杂事故。在钻井前,通过绘制以往钻井液密度等值线图和复杂情况分布图,对过去钻井时发生的典型复杂情况进行分析;同时利用套损、动静态数据分析高压区形成的原因,初步确定高压区类型、范围和地层压力大小,为钻前钻井液密度设计提供了依据。以杏二中异常高压区为例进行了钻前地层压力预测和应用。在钻井施工中,通过分析测井曲线特征与地层压力的关系,研究出利用测井曲线特征定性判断高压层、欠压层和正常压力层的方法。根据自然电位测井原理,通过不同钻井液电阻率和密度条件下的测井现场试验,拟合出利用自然电位测井资料预测地层压力的经验公式。在钻井液密度设计方面,根据地层物性、地层流体性质和地层压力大小,对地层压力剖面中的各层对钻井的危害性进行评价,挑选出最有危害性的小层进行跟踪,然后向邻井进行插值和递推,滚动设计合理的钻井液密度。更多还原

【Abstract】 After more than 40 years’water flooding development, the distribution of the formation pressure in Xing 1-3 Area has changed enormously compared with original one. The pressure has the characteristics which abnormal high pressure formation and low pressure formation is vertically co-existing and local well area becomes abnormal high pressure zone. If the formation pressure can’t be predicted accurately, equivalent drilling fluid density can’t be designed reasonablly and so that all sorts of complex accident are likely to happen during the production of drilling.Before drilling in Xing 1-3 Area, drilling complex conditions are analyzed by drawing drilling fluid density contour maps and the distribution maps of complex conditions and the causes of high pressure formation are analyzed by casing damage, static and dynamic data. The types and range of high pressure zone and the size of formation pressure are determined to provide evidence for drilling fluid density design. The pressure prediction and application of Xing Er Middle high pressure zone is used as an example to provide before drilling.During drilling, the way that high pressure formation, low pressure formation and normal formation are judged qualitatively is worked out by studying formation pressure data and the characteristics of logging curve. Based on principle of natural electric potential logging and field testing under the conditions of different resistivity and drilling fluid density, the perience formula that forecasts formation pressure by using natural electric potential logging data are fitted out.In the respect of drilling fluid density design, according to stratum properties, fluid property and formation pressure, the dangerous degree of the layers in the formation pressure section is evaluated and pick out the most harmful one to trace. By interpolating to the adjacent wells and the recursive method, equivalent drilling fluid density is designed one by one.更多还原