注水井改为注气井的套管柱安全性研究

结合某油田的H1 2 - 1高压注气井开展了套管柱强度校核方面的研究 ,提出了一套适合于高压注气井套管受力分析和强度安全性校核的步骤和方法。在套管柱强度校核中 ,套管的受力分析应当结合实钻井眼轨迹和实际注气工况 ,充分考虑轴向力、外挤和内压力对套管API强度的影响 ,进行三轴应力强度校核 ,同时应该考虑封隔器的安装与否以及安装高度和注气条件下气体所产生的压力 ,以此来计算套管柱所承受的内压力。提出的套管柱设计方法得到了现场验证

Security of casing string in gas injection well altered from water injection well

An investigation is made in the aspect of strength check of the casing string in a high pressure gas injection well altered from water injection well.Procedures and methods for the force analysis and security assessment of the casing string in high pressure gas injection well are proposed.In the strength check of the casing,the influences of axial force,internal and external compressive forces on API strength should be taken into account.The formulas for calculating the triaxial stress strength are derived.The design of casing string has been verifled in the field.