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通过建立储气井受力模型,对水泥环与井筒界面之间的界面压力进行计算,得到了储气井固井水泥环与井筒之间的摩擦力和储气井固井临界长度:理想固井状态下,对于φ177.8和φ244.48储气井,固井长度超过0.7m,则井筒不会脱离水泥环从地面窜出。在水泥环与地层不脱离的情况下,当地层土为粉细砂时,φ177.8和φ244.48储气井地面以下连续固井长度分别需要达到43m和60m。针对储气井上部腐蚀减薄和固井不合格的情况,分析了加固混凝土对储气井井筒的加强作用:若储气井井口段采取有效加固处理和充分的防腐措施,即使储气井壁厚的减薄量超过腐蚀裕量,正常工作压力下储气井井筒的实际应力也低于许用应力。
Through the establishment of the bearing model of gas well, the interface pressure between the cement ring and the wellbore interface is calculated, and the friction between the wellbore cementing well and the wellbore and the critical length of well fixation are obtained. In the ideal cementing state , For φ177.8 and φ244.48 gas storage wells, cementing length of more than 0.7m, the wellbore will not escape from the ground cement ring. In the case of cement ring and strata do not detach, when the local soil is fine silt, continuous cementing lengths below φ177.8 and φ244.48 need to reach 43m and 60m respectively. Aiming at the situation of thinning corrosion in the upper part of gas storage well and cementing failure, the reinforcing effect of reinforced concrete on the wellbore of gas storage well is analyzed. If the wellhead section of gas storage well is effectively reinforced and fully anticorrosive measures are taken, Thin excess of corrosion allowance, the actual stress of gas well bore under normal working pressure is also lower than allowable stress.