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巴麦地区地质条件复杂,特别在压力系统、地层特性等方面,难以获得工程所需的详细数据资料;各区块层系深度、厚度、岩层性质及工程特征、压力体系等差异显著,钻井技术难度大,作业风险高。行业标准中,给出了“自下而上”和“自上而下”两种井身结构设计方法。所谓自下而上,系根据裸眼井段安全钻进应满足的压力平衡、压差卡钻约束条件,自全井最大地层孔隙压力处开始,自下而上逐次设计各层次套管下入深度;所谓自上而下,是根据裸眼井段安全钻进应满足的压力平衡、压差卡钻约束条件,在已确定了表层套管下入深度的基础上,从表层套管鞋处自上而下逐层设计各层套管的下入深度。在巴麦区块井身结构设计时,将两种方法联合应用,并将两个设计结果进行比较,可以给出每层套管的合理下入深度区间。提出的井身结构设计方案,有待通过钻井施工实践,进一步完善和优化。
Due to the complex geological conditions in the Baimai area, it is difficult to obtain the detailed data needed for the project, especially in the aspects of the pressure system and the stratum characteristics. The depth, thickness, rock properties and engineering characteristics of the blocks and the pressure system are significant differences. Large, high operational risk. In the industry standard, two methods of well structure design are given: “bottom-up” and “top-down”. The so-called bottom-up, according to the open hole section of the safe drilling should be to meet the pressure balance, pressure card stuck constraints from the entire well maximum pore pressure at the beginning, bottom-up design of each level of casing into the depth ; The so-called top-down, is based on the pressure to open hole safety drilling should meet the pressure balance, pressure card stuck constraints, has been identified in the depth of the surface casing under the depth of the casing from the shoe The design of each layer under the casing into the depth. In the design of the wellbore structure of the Baima block, the two methods are combined and the two design results are compared to give a reasonable depth-to-depth range for each casing. Proposed well structure design, pending drilling practice, to further improve and optimize.