In this study,the full-bore soluble plug was taken as an objective to analyze its key structure for pressure bear-ing and main controls on temperature resistance in order to meet the need of completion under pressure for internal plug-ging tools in sustainably upgrading reliability and efficiency.And then a thought was put forward to resolve the contradic-tion 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 al-loy 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 re-sistance.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 de-velopment of unconventional reservoirs.
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
Key words
Efficient development of gas reservoir/Operation under pressure/Internal plugging tool/Soluble plug/Magne-sium alloy/Well barrier/PECVD
维普
万方数据