川西须家河深层气井完井方法优选研究

发布时间：2018-03-14 00:11

本文选题：完井方法　切入点：岩石力学参数　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：川西坳陷须家河组深层资源丰富,具有巨大的勘探开发前景。但由于其成藏条件复杂,纵向上地层较为悬殊的压力体系较多,并具有高温、高压的特点,这给完井工艺提出了很高的要求。近年来须家河组完成的多口深井在完井工艺技术方面均存在一定问题,直接影响了川西深层气藏的储层评价和开采。为此,基于国内高温高压气井完井工艺技术现状,结合须家河组气藏工程地质条件,分析了整个完井方法选择的难点,最后根据须家河组的气藏类型、储层特征、储层以上纵向地层特征及各种地质、工程措施要求,采用经济评价、动态分析手段,优选了开发川西深层气藏最佳完井方法。通过研究,取得的主要成果和结论如下：1)通过进行室内岩石力学实验,完成了川西须家河深层气层6块岩心抗压强度、弹性模量、泊松比的测定；6块岩心的抗拉强度测定。为川西须家河深层气层其它井岩石力学参数及地应力剖面综合测井解释标定奠定了基础。2)完成了CG561井、CG561B井、CG561ZH井、CL562C井、CL562E井、CX560B井、CF563D井共7口井的岩石力学参数和地应力随井深变化的综合测井解释,得到了岩石力学参数及地应力、破裂压力与井眼深度的综合关系式。统计分析得到的最大、最小主应力及破裂压力与井眼深度的相关性较好。得到的岩石力学、地应力、破裂压力参数将为完井方法优选过程中井壁稳定性和地层出砂判断提供基础数据。3)在现有气井二项式产能方程的基础上,分孔隙型和裂缝型地层类型推导了裸眼系列完井方式和射孔系列完井方式的产能预测模型。4)考虑井眼稳定性,地层是否出砂、气水分布特征,基于产能预测、经济评价、动态分析,利用气井完井方法优选程序,对川西须家河深层气层进行了完井方法优选。最终推荐的完井方法为：贯眼套管完井(打孔管完井)。具体实施时,可根据钻遇情况,可选择带封隔器贯眼套管完井和不带封隔器贯眼套管完井。本文形成的完井方法优选技术,将为同类气藏完井方法的优选提供参考和指导。
[Abstract]:The Xujiahe formation in western Sichuan depression is rich in deep resources and has great prospect of exploration and development. However, because of its complicated reservoir formation conditions, there are many pressure systems with different vertical strata, and it has the characteristics of high temperature and high pressure. In recent years, many deep wells completed in Xujiahe formation have some problems in completion technology, which directly affect the reservoir evaluation and production of deep gas reservoirs in western Sichuan. Based on the present situation of high temperature and high pressure gas well completion technology in China and combined with the engineering geological conditions of Xujiahe formation gas reservoir, the difficulties of selecting the whole completion method are analyzed. Finally, according to the gas reservoir type and reservoir characteristics of Xujiahe formation, The characteristics of vertical strata above the reservoir and the requirements of various geological and engineering measures are optimized by means of economic evaluation and dynamic analysis to select the best completion method for developing deep gas reservoirs in western Sichuan. The main results and conclusions obtained are as follows: (1) through the laboratory rock mechanics experiments, the compressive strength and elastic modulus of 6 cores of deep gas layer in Xujiahe River, western Sichuan Province, have been completed. The determination of Poisson's ratio and the determination of tensile strength of core in block No. 6 laid a foundation for the comprehensive interpretation and calibration of rock mechanics parameters and in-situ stress profile of other wells in Xujiahe deep gas formation in western Sichuan) and completed the CL562E well of CG561 well Gui CG561B well and well CL561ZH. Comprehensive log interpretation of rock mechanics parameters and in-situ stress variation with depth of 7 wells in CX560B well and CF563D well. The relationship between rock mechanics parameters and in-situ stress, fracture pressure and borehole depth is obtained. The maximum and minimum principal stress and the correlation between fracture pressure and borehole depth are obtained by statistical analysis, and the rock mechanics and in-situ stress are obtained. Fracture pressure parameters will provide basic data. 3) on the basis of binomial productivity equation of existing gas wells, it will provide basic data for wellbore stability and formation sand production judgment during completion method optimization. The productivity prediction model of open hole series completion mode and perforating series completion mode. 4) considering borehole stability, formation sand production, gas and water distribution characteristics, based on productivity prediction, economic evaluation. Based on the performance analysis, the completion method of Xujiahe deep gas reservoir in West Sichuan is optimized by using the gas well completion method. The final recommended completion method is as follows: perforating casing completion (drilling tube completion). When it is put into practice, it can be applied according to the situation of drilling. Well completion with and without Packer perforating casing can be selected. The optimized selection technology of completion method developed in this paper will provide reference and guidance for the optimization of completion methods in similar gas reservoirs.
【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】：TE257

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