摘要
川西气田海相具有超深层高温、含盐膏层、高含硫特性,三开制超深大斜度井在开发过程中,恶性漏失、失返性漏失频繁发生。环氧树脂堵漏剂具有常温可泵性、固结时间温控性、固结抗压强度高、大裂缝封堵效果显著等特点,但其黏度相对较高,易在井筒、管道内出现黏附、黏结,且固结成型后不溶、不熔,溶解、解堵异常困难。针对环氧树脂堵漏剂相关技术问题,通过溶解机理分析、溶解正交分析及溶解剂防腐性能优化,研制形成环氧树脂堵漏剂用溶解剂,该溶解剂在120℃、24 h条件下对环氧树脂堵漏剂的溶解率为97.82%,对N80钢片腐蚀速率仅为0.0086 g/(m^(2)·h),低于轻微腐蚀评价标准(0.022 g/(m^(2)·h)),为解决恶性漏失堵漏作业后快速溶解、解堵、井下管柱安全等技术难题提供了新途径。
The marine facies of the Chuanxi gas field has characteristics of ultra-deep high temperature,salt gypsum layer,and high sulfur content.The development of the triple well system with ultra-deep and high inclination results in frequent malignant and recurrent losses.Epoxy resin plugging agent has the characteristics of pumpability at room temperature,temperature control of consolidation time,high consolidation compressive strength,and significant sealing effect for large cracks.However,its viscosity is relatively high,and it is prone to adhesion and bonding in the wellbore and pipeline.After consolidation,it is insoluble and non melting,making it extremely difficult to dissolve and unblock.In response to the problems related to epoxy resin plugging agent,dissolution mechanism analysis,dissolution orthogonal analysis,and optimization of the anti-corrosion performance of the dissolution agent are conducted,develop a dissolution agent for epoxy resin plugging agent,which has a dissolution rate of 97.82%for epoxy resin plugging agent under conditions of 120℃ and 24 hours.The corrosion rate for N80 steel sheet is only 0.0086 g/(m^(2)·h),which is lower than the evaluation standard for slight corrosion(0.022 g/(m^(2)·h)).This provides a new way to solve technical problems such as rapid dissolution,unblocking,and downhole string safety after malignant leakage plugging operations.
作者
兰林
LAN Lin(The Engineering Technology Institute of Southwest Petroleum&Gas Branch,Deyang,Sichuan 618000)
出处
《钻井液与完井液》
CAS
北大核心
2023年第3期410-414,共5页
Drilling Fluid & Completion Fluid
关键词
环氧树脂堵漏剂
溶解剂
溶解解堵
Epoxy resin plugging agent
Dissolving agent
Dissolution and unblocking
