초록 ▼

A pressure and temperature system for monitoring pressure and temperature conditions in a permanent installation in a high temperature production well traversing earth formations where the system in a pressure tool incorporates a programmable logic array device and a low density memory device. Each

A pressure and temperature system for monitoring pressure and temperature conditions in a permanent installation in a high temperature production well traversing earth formations where the system in a pressure tool incorporates a programmable logic array device and a low density memory device. Each of a number of independent pressure tools is programmed to respond to a distinct digital polling signal for selecting a particular tool so that a single wire conductor can be used for data and control signal communication between the pressure tools placed downhole and a computer system situated at the earth surface. The system in a tool is powered up and down for each selected operation to conserve individual component useful life and the number of downhole components subject to high temperature is minimized.

대표청구항 ▼

A system for monitoring downhole pressure in a high temperature well bore over an extended period of time where there are multiple pressure sensing tools in the well bore which are connected to a common single wire conductor cable disposed within said well bore and leading to the earth\s surface and

A system for monitoring downhole pressure in a high temperature well bore over an extended period of time where there are multiple pressure sensing tools in the well bore which are connected to a common single wire conductor cable disposed within said well bore and leading to the earth\s surface and for selectively reading out pressure measurements from the respective pressure sensing tools, which system is comprised of: a production string of pipe disposed in a high temperature well bore; more than one pressure sensing tool disposed downhole on the string of pipe where each pressure sensing tool is connected to the single wire conductor cable which extends along the string of pipe to the earth\s surface; each of said pressure sensing tools having sensor means for obtaining pressure measurements in digital format, downhole communication means for receiving and sending digital signals on said single wire conductor cable, programmable means for storing a specified operational configuration for processing digital signals of the pressure sensor means in digital format, programmable logic means connected to said pressure sensor means and said downhole communication means, said logic means in each of said pressure sensing tools respectively being configured and arranged to respond to a selected characterized digital polling signal from the earth\s surface to output pressure measurements from a selected sensor tool to said conductor cable for transmission of digital signals up to the earth\s surface; surface communication means at the earth\s surface connected to said conductor cable for selectively generating different characterized digital polling signals on the conductor cable so that a characterized digital polling signal can be used by said logic means for selectively actuating one of said pressure sensing tools to obtain pressure measurements from the one pressure sensing tool independently of any or all of the other sensing tools.