摘要
为了满足带压完井作业对于内封堵工具不断升级的可靠性与效能需求,以全通径可溶堵塞器为研发对象,分析了工具承压关键结构与耐温性能的关键因素,提出了一种解决高压应力集中与材料安全强度矛盾的设计思路。研究结果表明:(1)通过CAD/CAE一体化设计方法,确立了更为安全可靠的承压封堵结构;(2)基于高温力学实验数据,通过对可溶镁合金材料化学配方的优选,筛选出最佳材料组合,解决了材料高温力学强度和可溶解性之间的矛盾;(3)利用等离子增强气相化学沉积法(PECVD法)制备多层纳米防护膜,提升了工具耐腐蚀性能,确保可溶堵塞器承压稳定可靠的基础上又能后期快速溶解。结论认为,所研制的全通径可溶堵塞器具备较好的耐温与承压能力,以及耐腐蚀性能,作业完成后可以快速溶解,不留任何残留物,有利于下一步作业实施,为带压完井作业和非常规油气藏高效开发提供了一种更为可靠的、绿色经济的工具解决方案。
In this study,the full-bore soluble plug was taken as an objective to analyze its key structure for pressure bearing and main controls on temperature resistance in order to meet the need of completion under pressure for internal plugging tools in sustainably upgrading reliability and efficiency.And then a thought was put forward to resolve the contradiction between high-pressure stress concentration and material safety strength.Results show that(i)a safer and more reliable pressure-bearing plugging structure is established by means of the CAD/CAE integrated design method;(ii)in the light of experimental data on high-temperature mechanics,combined with the selected chemical formula of soluble magnesium alloy materials,the best material association is determined,and the contradiction between high-temperature mechanical strength and material solubility is resolved;and(iii)the Plasma-Enhanced Chemical Vapor Deposition(PECVD)method is used to prepare multi-layer nano-protective film,which may effectively improve the corrosive resistance of the plug and ensures its pressure-bearing stability and reliability as well as the quick dissolution in the later stage.It's concluded that this soluble plug boasts excellent temperature resistance and pressure-bearing capabilities besides outstanding corrosive resistance.Without any residue,it can be dissolved quickly after the operation is finished,which is conducive to the next work,and provides a more reliable,green and economical tool for not only completion under pressure but the efficient development of unconventional reservoirs.
作者
何明格
张明友
袁艺绮
杨川琴
王伟
HE Mingge;ZHANG Mingyou;YUAN Yiqi;YANG Chuanqin;and WANG Wei(Well Intervention Company,CNPC Chuanqing Drilling Engineering Company Limited,Chengdu,Sichuan 610065,China)
出处
《天然气技术与经济》
2024年第5期23-28,共6页
Natural Gas Technology and Economy
关键词
气藏高效开发
带压作业
内封堵工具
可溶堵塞器
镁合金
井屏障
PECVD
Efficient development of gas reservoir
Operation under pressure
Internal plugging tool
Soluble plug
Magnesium alloy
Well barrier
PECVD
