| 摘要 |
A Deployment of fibre optic cables and joining of tubing for use in bore holes. A self supporting fibre optic cable (2,14')Â is slidingly deployed in a borehole via a small diameter conduit (1,2') which may be perforated to enable distributed sensing over at least part of the length of the cable. The cable may comprise a casing made from plural concentric tubular steel layers with aligned perforations. In another embodiment, a cable is deployed via wellhead valving and suspended from a fixture comprising a pulley assembly located beneath the valving. The pulley assembly takes up slack in the cable when the upper end of the cable is released, allowing the cable to fall through the valving so that the valving can be closed. The upper end of the cable includes a termination which is located by the fixture so that it can be retrieved. In another embodiment, two concentric tubing portions are joined by forming dimples in the inner tubing portion which extend into holes the outer tubing portion. |
