| 摘要 |
<p>There is described a memory gauge for obtaining information pertinent to an environmental condition in a well bore. The memory gauge can repetitively sample the environmental condition in a well bore at sample rate intervals so that information pertinent to the environmental condition is obtained in correspondence with the sampling. A circuit is connected with the sampling, to sample the environmental condition to obtain information pertinent thereto whenever the environmental condition changes at a rate passing a predetermined threshold irrespective of the sample rate intervals. The circuit can sense the environmental condition and provide an electrical signal having a characteristic which changes with changes in the environmental condition. It can define a rate-of-change threshold and can determine in response to the electrical signal and the characteristic thereof, whenever the environmental condition changes at a rate passing the defined rate-of-change threshold irrespective of the sample rate intervals. In response to the above, the circuit also provides a control signal to the sampling to cause the latter to sample the environmental condition.</p> |
