高温高压封隔器实验室防护墙的抗爆性分析

Analysis on Explosion Resistance of Protective Wall in HTHP Packer Lab

井下封隔器的地面测试试验在高温高压工况下进行,若防护墙的抗爆性不足将会造成重大事故,为此需要对防护墙的抗爆性能进行分析。运用解析计算和有限元计算两种方法,分别计算了试验间在4种典型工况下发生爆炸后,8种常规爆炸飞出物和6种极端爆炸物(弹头状)垂直撞击防护墙壁面的侵彻深度。封隔器测试试验中的8种常规爆炸飞出物中,直径15 mm、长20 mm的圆柱体对防护墙的侵彻深度最大为35.1 mm,封隔器测试试验中的5种极端爆炸物中,以15 mm弹头状物体对防护墙的侵彻深度最大。对无玻纤混凝土防护墙的侵彻深度为101.1 mm,达到防护墙的极限,而对含5%玻纤增强混凝土夹层防护墙的侵彻深度为81.7 mm,后者比前者的抗爆性能相对增强22.1%。将解析计算结果与现有的带装甲钢背板钢纤维混凝土靶抗侵彻试验数据进行了对比,误差范围1.5%~20.6%,验证了解析方法的正确性和可靠性。建议选用前后6 mm厚钢板、中间夹层含5%玻纤增强混凝土及总厚度为100 mm的防护墙设计方案。研究结果对封隔器地面性能试验具有参考意义。

The ground test of downhole packer is carried out under high temperature and high pressure(HTHP)conditions.If the explosion resistance of the protective wall is insufficient,it will cause major accidents.Therefore,it is necessary to analyze the explosion resistance of the protective wall.The analytic calculation and finite element calculation methods were used to calculate the vertical penetration depths of 8 conventional explosive flyouts and 6 extreme explosives(bullet shaped)into the protective wall after the explosion occurred in 4 typical working conditions in the test room respectively.Among the 8 conventional explosive flyouts in the packer test,the maximum penetration depth of the cylinder with a diameter of 15 mm and a length of 20 mm to the protective wall is 35.1 mm;and among the 6 extreme explosives in the packer test,the penetration depth of the 15 mm bullet shaped object to the protective wall is the maximum.The penetration depth to the glass fiber free concrete protective wall is 101.1 mm,reaching the limit of the protective wall;whereas the penetration depth to the 5%glass fiber reinforced concrete interlayer protective wall is 81.7 mm,indicating that the explosion resistance of the latter is enhanced by 22.1%than that of the former.The analytic calculation results were compared with the penetration resistance test data of existing steel fiber concrete target with armor steel backboard,and the error range was 1.5%~20.6%,verifying the correctness and reliability of the analytic method.It is suggested to select the design scheme of protective wall with total thickness of 100 mm containing 6 mm thick steel plate on both sides and a 5%glass fiber reinforced concrete layer in the middle.The research results have reference significance for the ground performance test of the packer.