泥岩进水诱发地层滑移条件下的套变影响因素分析
Analysis on influence factors of casing deformation under formation slip caused by mudstone water-entering
王峰1
作者信息
- 1. 中国石油吉林油田公司二氧化碳捕集埋存与提高采收率开发公司,吉林松原 138000
- 折叠
摘要
吉林大情字油田注水开发过程中由于泥岩进水诱发地层上抬从而导致弱结构面滑移,进一步使油水井发生严重套变现象.为实现对油水井注水开发后套变情况的预测,基于有限元建立数值模型,结合油田现场资料,对泥岩进水滑移导致套变的影响因素进行分析.研究结果表明,泥岩层未进水时,套管壁厚增大到10.54 mm,或将套管钢级提升为TP140V时,能够有效避免套管失效;进水后,套管壁厚需增到14.27 mm,而套管钢级仍然选用TP140V才能避免套管失效;对于注CO2的井,当泥岩层未进流体,套管屈服强度降至458 MPa时,套变量增大了 82％;流体进入后,套管屈服强度降低到458 MPa时,套变量增大了 125％.该研究结果对油田预防套变具有一定的指导意义.
Abstract
The weak structural plane slip was caused by mudstone water-entering in the process of water injection de-velopment in Daqingzi Oilfield in Jilin Province,which further resulted in severe casing deformation in oil and water wells.In order to predict the casing deformation of oil and water well after water injection development,a numerical model is established based on the finite element method,and the influencing factors of casing deformation are ana-lyzed under formation slip caused by mudstone water-entering based on field data.The results show that the casing failure can be effectively avoided when the mudstone layer is not flooded,the casing wall thickness is increased to 10.54 mm,or the casing steel level is elevated to TP140V.After water injection,the thickness of the casing wall should be increased to 14.27 mm,while TP140V is still used for casing steel grade to avoid casing failure.For CO2 injection well,the casing yield strength drops to 458 MPa,and the casing variable increases by 82％when there is no fluid in the mudstone layer.The yield strength of the casing decreases to 458 MPa,and the casing variable increases by 125％when there is fluid in the mudstone layer.This research result has a certain guiding significance to prevent casing deformation in an oil field.
关键词
注水开发/泥岩吸水/地层滑移/套管变形/数值模拟Key words
water injection development/mudstone water absorption/formation slip/casing deformation/numerical simulation引用本文复制引用
基金项目
国家科技重大专项(2016ZX05016-002)
出版年
2024
NETL
NSTL
维普
万方数据