修复旧井的前提是摸清井管发生变化的原因,这就需要设法检视井管内部情况。因此我们从1972年下半年开始研究井内水下照相技术,经过一年多的试验,终于搞成一套简易照相设备,在井管检视中取得一定效果,在生产中发挥了作用。 The precondition for repairing an old well is to find out the reason for the change in the well pipe. This requires an effort to check the internal condition of the well pipe. Therefore, we began to study in-hole underwater photography technology from the second half of 1972. After more than one year of experimentation, we finally developed a set of simple photographic equipment that achieved certain results in well pipe inspection and played a role in production.