| 摘要 |
The present invention provides a method and apparatus for generating one or more than one physically detectable physical influence changes to control or manipulate a down hole device. The present invention intercepts existing control signals to various controllers on the rig and superimposes an encode d command on these existing control signals. The controllers comprise of motor drives, choke controllers (425), acoustic pulse generator/tracer injectors (423) and other controllers that are used to generate a physically detectabl e changes in the rig environment. The encoded command acting on existing or ne w controllers generates a perceptible change in a physical parameter such as a variation in drilling mud pressure (452), a variation in drill string rotati on speed (430), a variation is weight on bit (424), generation of acoustic puls e (436), or a variation in tracer injection properties. The physical change is sensed by a downhole device and interpreted as information indicating to the downhole device that it is to execute a command or adjust an operating parameter. |
