老井建儲氣庫固井二界面微環(huán)隙擴展規(guī)律研究
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中圖分類號：TE972文獻標識碼：A DOI：10.12473/CPM.202406043
Li Changyou，Zhang He，Li Chen，et al.Expansion of micro-annulus at the second cementing interface during construction of underground gas storage from old well[J].China Petroleum Machinery，2025，53（7）：67-74.
Expansion of Micro-Annulus at the Second Cementing Interface During Construction of Underground Gas Storage From Old Well
Li Changyou Zhang He Li Chen Yao Siyu （Sinopec Northeast Oil and GasCompany）
Abstract： Debonding may occur at the second cementing interface during construction ofunderground gas storages （UGSs） from old wels.Based on the fluid-solid interaction theory and the cohesive zone model（CZM），the Cohesiveunit in ABAQUS was used to establish a three-dimensional finite element model of the micro-annulus expansion at the second cementing interface during UGS construction from old well in the process of gas injection. Usingthis finite element model，the processof micro-annulus expansion at the second cementing interface was analyzed to investigate howdiferent parameters affecttheexpansion lengthof the micro-annulus at thesecond cementing interface inthe process of gas injection.Moreover，the bounds ofthesafe working parameters atthe time of gas injection were determined depending onthe conditions of example wels at the Gujiazi gas storage.The results show thatthe expansion of micro-annulus can be effectively inhibited by appropriately reducing the elastic modulus betwen the cement sheath and the formation，controlling thegas injectionrate and pressure，and increasing the bond strength ofthe second cementing interface.The injection pressure ofthe two example wells atthe Gujiazi gas storage is too high，and itisrecommended toreducetheinjection pressure tobelow 12.63and14.19 MPa，respectively.The conclusions obtained can provide practical guidance forthe safe operation of UGS constructed from old wells.
Keywords： UGS construction from old well； second cementing interface；micro-annulus；damage value； safeworking parameter
0 引言
在儲氣庫服役期間，井筒密封完整性被認為是影響井筒安全的一個核心要素[1]。（剩余11966字）