φ147 mm铝合金钻杆抗内外压强度试验研究

Research on Internal and External Hydrostatic Pressure Resistance of φ147mm Aluminum Alloy Drill Pipe

摘要:

铝合金钻杆因具有质量轻、比强度高、抗腐蚀性好、低磁等优点，在深井与超深井钻探作业中备受关注。在深井与超深井钻进中，铝合金钻杆需要承受巨大的内外压力，因此有必要对钻杆所能承受的最大内外压力进行计算与试验，对自行研制的φ147 mm铝合金钻杆进行了静水内、外压试验与弹性力学理论计算校核，7075铝合金钻杆在内压69.51 MPa时持续加压20 min，没有发生泄漏现象；最大抗外压值为107.4 MPa。2024铝合金钻杆在内压48.65 MPa时持续加压20 min，没有发生泄漏现象；最大抗外压值为72.3 MPa。试验表明，铝合金钻杆抗内、外压性能良好，从而保证了铝合金钻杆在深井及超深井钻进时的可靠性。

Abstract:

With light weight, high strength, good corrosion resistance and low-magnetic, etc., aluminum alloy drill pipe receives much concern in deep and ultra-deep drilling operations. In the deep and ultra-deep well drilling, as the aluminum alloy drill pipe needs to withstand enormous internal and external pressure, it is necessary to calculate and test its maximum internal and external pressure. Internal and external hydrostatic pressure tests were carried out on φ147mm self-developed aluminum alloy drill pipe and checked by elasticity theory calculations. No leakage happened for full-size 7075 and 2024 aluminum alloy drill pipes with 69.51MPa and 48.65MPa continuous internal pressure pressure-loading for 20min respectively and the maximum anti-external pressure values were 107.4MPa and 72.3MPa for each. The tests show that the aluminum alloy drill pipe has good property of anti-internal and external pressure to ensure its reliability in deep and ultra-deep drilling.