ofter adopt double-diameter casing structure.
地热井等一些特殊井通常采用上大下小的双径套管串结构 ,常规的固井方法无法满足该类井的固井要求。
The effects of casing diameter on acoustic log in cased-borehole at free pipe situation are investigated with finite element method(FEM).
数值计算例子表明,当套管直径增大时,套管波的幅度减小,视到时增大,主频有明显的降低。