新场须二段储层改造中的管柱力学分析  

Mechanical analysis of downhole string for reservoir stimulation in Xu-2 member of Xinchang area

作　　者：唐祖兵 TANG Zubing(Downhole Operation Company of Sinopec Southwest Oil Engineering Co.,Ltd.,Deyang,Sichuan 618000,China)

机构地区：[1]中石化西南石油工程有限公司井下作业分公司,四川德阳618000

出　　处：《世界石油工业》2023年第2期73-79,共7页World Petroleum Industry

摘　　要：川西新场须二段气藏埋藏深,储层温度压力高,储层改造时井下管柱温度骤变、内外流体压力变化大,导致井下管柱受载恶劣,管柱失效的风险增高。储层改造所用的井下管柱的受力分析是管柱设计的关键点,而传统的管柱力学模型未细分整个井下作业过程,管柱下入、坐封、改造等各工况的受力边界条件缺少关联,管柱在改造工况下的受力计算并不精准。以单元段储层改造管柱平衡方程为基础,综合考虑温度、压力、井眼轨迹、屈曲等因素,并结合下入、坐封、改造作业过程中温度、压力变化引起的管柱变形及管柱约束条件,建立了井下管柱力学模型。将模型应用于川西新场须二段高压气井储层改造时管柱力学分析,验证管柱力学模型的适用性,为管柱设计提供数据支撑。The Xu-2 gas reservoir in Xinchang,west Sichuan,is buried deeply and the reservoir temperature and pressure are high.The fracturing string is badly loaded,which increases the risk of pipe failure because of the sudden change in fracturing string temperature and the significant change in internal and external fluid pressure during the fracturing.The load analysis of the fracturing string used in the reconstruction is the focus of the string design.However,in the traditional mechanical model of tubular string,the whole process of transformation is not subdivided.The load calculation of fracturing string under transformation conditions is inaccurate because the load boundary conditions of various working conditions,such as string tripping,setting and fracturing,are not related in the traditional mechanical model.For this reason,a more accurate mechanical model of the fracturing string is introduced by considering variables such as temperature,pressure,wellbore trajectory and buckling as well as combining them with the deformation and string constraint conditions brought on by changes in temperature and pressure during the tripping,setting and fracturing operations.Finally,the model is applied to the Xu-2 high-pressure gas well in Xinchang,western Sichuan,which verifies the applicability of the string mechanical model and provides data support for string design.

关 键 词：储层改造 高温 高压 井下管柱 力学 

分 类 号：TE931[石油与天然气工程—石油机械设备]