摘要
多段压裂是低渗透、低丰度非常规油气藏投产和提高采收率的有效手段。分轮次多段压裂会导致井筒内温度压力产生周期性变化,从而对固井界面胶结密封性造成损伤,破坏水泥环完整性。为定量分析固井界面胶结的损伤程度,采用ABAQUS顺序耦合将井筒温度场与压力场进行热力耦合分析,并在组合体模型界面间定义cohesive-Based胶结属性来模拟和分析循环温度应力场作用下的界面胶结情况。结果表明:ABAQUS中的Cohesive-Based接触能有效地模拟井筒界面间的胶结状态,其分析压裂工况对界面胶结损伤的解析结果与实验数据吻合较好;井筒内周期性温度变化会加剧固井界面胶结损伤,减小水泥环弹性模量与热膨胀系数、增大水泥环泊松比能降低多段压裂工况条件下界面胶结失效的风险。分析结果可为降低多段压裂井水泥环损伤措施的制定提供依据。
Multistage fracturing is an effective way to bring unconventional reservoirs with low permeability and low abundance into production and enhance recovery.However,periodic changes of temperature and pressure in the wellbore caused by multi-stage fracturing in different rounds will damage the cementing sealing property of the cementing interface and destroy the integrity of the cement ring.To analyze the damage degree of cementing interface,the thermodynamic coupling analysis of wellbore temperature field and pressure field is carried out by using ABAQUS sequential coupling,and the cohesive-Based bonding property is defined between the interfaces of the assembly model to simulate and analyze the interfacial bonding under the action of cyclic temperature stress field.The results show that:①The Cohesive-Based contact in ABAQUS can simulate the bonding state between wellbore interfaces,and the analytical results of Cohesive bonding damage under fracturing conditions are in good consistent with the experimental data.②The periodic temperature variation in wellbore will aggravate the damage of cementing interface,reduce the elastic modulus and thermal expansion coefficient of cement ring,and the increase Poisson’s ratio of cement ring can reduce the risk of interface cementing failure under multi-stage fracturing conditions.The analysis results can provide a basis for formulating measures to reduce cement ring damage in multi-stage fractured wells.
作者
李微
钱肖峰
程荣升
杜海滨
LI Wei;QIAN Xiaofeng;CHENG Rongsheng;DU Haibin(School of Petroleum Engineering,Yangtze University,Wuhan,Hubei 430100,China;Hubei Key Laboratory of Drilling&Production Engineering for Oil&Gas,Yangtze University,Wuhan,Hubei 430100,China;Drilling Technology Research Institute of Shengli Petroleum Engineering Co.,Ltd.,SINOPEC,Dongying,Shandong 257000,China)
出处
《石油地质与工程》
CAS
2023年第3期106-110,共5页
Petroleum Geology and Engineering
基金
油气钻采工程湖北省重点实验室开放基金资助项目(YQZC202205)
西安市致密油(页岩油)开发重点实验室开放基金资助项目(XSTS-202101)
湖北省教育厅重点项目(D20201304)。
关键词
温压变化
界面损伤
数值模拟
物模实验
井筒完整性
variation of temperature and pressure
interface damage
numerical simulation
physical model experiment
wellbore integrity
