摘要
准噶尔盆地南缘超深层勘探已成为中国石油天然气勘探的重点领域,钻完井工程面临诸多高温高压环境的挑战。在完井试产期间,井筒温度和压力的大幅度且快速下降会改变水泥环应力,易导致套管和水泥环收缩不平衡,产生微间隙。为此,采用厚壁圆筒弹性力学理论,建立了套管-水泥环-地层组合体弹性力学模型,利用有限差分程序求解。研究认为,高温高压油气藏试产期间,水泥环的主要失效形式为收缩微间隙失效。以准噶尔盆地南缘高泉背斜高探1井试产为例,评价试产过程中水泥环失效时井筒压降及温度变化临界值,以及两者与水泥石力学参数的相互关系。该力学评价方法的研究对于高温高压油气藏试产期间水泥环完整性评价具有较高的应用价值。
Ultra deep exploration in the southern margin of Junggar Basin has become a key field of oil and gas exploration in China,and the drilling and completion engineering is facing many challenges of high temperature and pressure environment.During well completion and trial production,the large and rapid decrease of wellbore temperature and pressure will change the stress of cement sheath,which will easily lead to unbalanced shrinkageand micro gap of casing and cement sheath.Therefore,based on the theory of thick wall cylinder,the elastic mechanics model of casing cement sheath formation combination was established and solved by the finite difference program.It was considered that the main failure mode of cement sheath was shrinkage micro gap failure during the trial production of high temperature and high pressure(HTHP)oil and gas reservoir.Taking the production test of Gaotan-1 well in Gaoquan anticline in the southern margin of Junggar Basin as an example,the critical values of wellbore pressure drop and temperature change in the process of cement sheath failure,and the relationship between them and the mechanical parameters of cement stone were evaluated.The study of the mechanical evaluation method has a high application value for the integrity evaluation of cement sheath during the trial production of HTHP gas reservoir.
作者
徐新纽
阮彪
杜宗和
黄鸿
张伟
杨虎
周鹏高
XU Xin-niu;RUAN Biao;DU Zong-he;HUANG Hong;ZHANG Wei;YANG Hu;ZHOU Peng-gao(Exploration Department, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China;China University of Petroleum (Beijing) at Karamay, Karamay 834000, China;Karamay Vocational & Technical College, Karamay 834000, China)
出处
《科学技术与工程》
北大核心
2021年第19期7924-7930,共7页
Science Technology and Engineering
基金
国家科技重大专项(2016ZX05003)
中国石油天然气股份有限公司科技项目(2019F-33)。
关键词
准噶尔盆地南缘
高温高压
油气藏试产
固井水泥环
微间隙
加载速率
力学完整性
高探1井
southern margin of Junggar Basin
high temperature and high pressure
trial production of oil and gas reservoir
cement sheath
micro gap
loading rate
mechanical integrity
Gaotan-1 well
