Surface/downhole pressure recording system
AssigneePanex Corporation
InventorLeroy C. Delattore
Life of this patent
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Abstract
A system for the output of data on a two wire cable system from a downhole well tool which has a system with sensor devices, a processor, a clock, a memory and a voltage/current communications device which are all powered by a d.c. battery to a surface read-out where the downhole well tool is actuated for cable transmission of data during operation by an additional power source which is provided from a surface power source so that failure of the cable transmission does not affect the well tool collection of data.
Claims10
A well tool for obtaining pressure data in a well bore and including;
- a pressure sealed housing for enclosing a pressure transducer, a CPU, a memory means and a communications means where said memory means, in response to instructions from said CPU, obtains pressure data from said pressure transducer and stores said pressure data in the memory means as a function of time, and where said pressure transducer, said CPU and said memory means are powered by a tool d.c. power supply having an operating voltage below a given voltage level and where said communication means is responsive to an additional voltage applied in series with said d.c. power supply for the input of instruction data to said CPU and the output of pressure data from said memory means;
- and
- a pressure communications housing attachable to said pressure housing, said pressure communications housing enclosing a voltage regulator means for supplying an additional d.c. voltage to said tool d.c. power supply for actuating said communication means.
A method for obtaining pressure data in a well bore with a well tool having an pressure housing for enclosing a pressure transducer, a CPU, a memory means and a communications means where said memory means stores pressure data in the memory means as a function of time, and where said pressure transducer, said CPU and said memory means are powered by voltage from a tool d.c. power supply operating below a given voltage level and where the communication means responds to a voltage above said given voltage level in a transmission mode for the input of instruction data to said CPU and for the output of data from said memory means, and where a pressure communications housing is attached to said pressure housing and has a voltage regulator means for supplying an additive d.c. voltage to said d.c. power supply to place said communication means in said transmission mode;
- the method including the steps of:
- locating the well tool in a well bore on a cable extending from the earth's surface and having at least two conductors;
- sensing pressure parameters in the well bore with the pressure transducer in the well tool and storing said pressure parameters in the memory means;
- supplying a additive d.c. voltage to said voltage regulator means from the earth's surface via said two conductors to raise the applied voltage in said tool above said given voltage level for transmitting pressure data from the well tool to the earth's surface via the two conductors in the cable;
- said storing of said pressure parameters in the memory means being independent from transmitting the pressure data to the earth's surface;
- and
- applying the voltage of the tool d.c. power supply to the CPU and the memory means in the well tool independently of the d.c. voltage from the earth's surface.
Dependencies are inferred from the claim text.