Well treating system with pressure readout at surface and method

• US 5,350,018 A
• Filed: 10/07/1993
• Issued: 09/27/1994
• Est. Priority Date: 10/07/1993
• Status: Expired due to Term

• Current Assignee: Dowell Schlumberger Incorporated (Schlumberger NV)
• Original Assignee: Dowell Schlumberger Incorporated (Schlumberger NV)
• Inventors: Willauer, Darrin, Thomeer, Hubertus V., Adnan, Sarmad, Eslinger, David M., Sorem, Robert M.
• Primary Examiner(s): NOVOSAD, STEPHEN
• Application Number:
  US08/133,631
• Time in Patent Office: 355 Days
• Field of Search: 166/250, 166/264, 166/65.1, 166/64, 166/66, 166/113, 166/384, 166/385, 166/387, 166/305.1, 166/191, 166/187, 166/240, 73/151
• US Class Current: 166/250.07
• CPC Class Codes: E21B 23/006 "J-slot" systems, i.e. lug and slot indexing mechanisms
• CPC Class Codes: E21B 33/1243 with inflatable sleeves
• CPC Class Codes: E21B 47/06 Measuring temperature or pressure
• CPC Class Codes: E21B 47/12 Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling

Abstract

A well treating tool string run on coiled tubing and having packers to isolate a zone to be treated in response to operation of a selector valve, pressure and temperature transducers in the tool string and a telemetry system which samples the measurements made by the transducers, an electrical conductor cable extending from the telemetry system up to the surface through the coiled tubing and to the inner end thereof on its storage reel, and a surface telemetry, data processing and display system that sends and receives encoded signals to and from the downhole telemetry system from which temperature and pressure values can be read out on the surface display in real time as the treating operation proceeds.

Claims

1. A well treating system where downhole variables such as pressure and temperature are made available at the surface in real time, comprising:

a tubular body adapted to be lowered into the well on a running string;

inflatable packer means on said body for isolating a zone of the well;

valve means operatively associated with said body for allowing packer inflation, fluid circulation, fluid injection and packer deflation;

a plurality of transducers in said body for sensing said variables and providing signals representative thereof;

transmission means connected to each of said transducers and including switching means for sampling the output of each of said transducer means;

electrical conductor cable means extending through said running string from the surface to said telemetry means; and

means connected to said cable at the surface for processing said signals and providing a real time display of each of said variables.

2. The system of claim 1 wherein said running string is coiled tubing wound on a reel and arranged to be run into and out of the well by traction means, said conductor cable extending throughout the entire length of said coiled tubing and being positioned therein prior to storage of said coiled tubing on said reel.

3. The system of claim 2 further including electrical connector means at the lower end of said conductor cable arranged to mate with electrical connector means at the upper end of said telemetry means.

4. The system of claim 3 wherein said transducers are mounted end-to-end in housings mounted within said body;

first passage means for communicating one of said transducers with fluid pressures in the well annulus externally of said body; and

second passage means for communicating another of said transducers with pressures inside said body.

5. The system of claim 4 wherein another of said transducers includes sensor means for measuring the temperature of fluids in said body.

6. A method of treating a well zone with a tool string run on coiled tubing and providing a surface read out of at least one downhole measurement during said treating, comprising the steps of:

positioning an electrical conductor throughout the length of said coiled tubing;

placing said coiled tubing on the reel of a coiled tubing unit;

bringing said conductor to the outside of the inner end of said coiled tubing where said conductor can be hooked up to a read-out device;

connecting the outer end of said coiled tubing to a tool string that can be operated downhole to isolate the zone to be treated;

electrically connecting the outer end of said conductor to transducer means for making said measurement;

lowering said tool string into the well on said coiled tubing and operating said tool string to isolate said well zone;

performing a treating operation in said well zone;

making a measurement with said transducer means in connection with said treating operation; and

obtaining a surface read out of said measurement via said conductor.

7. The method of claim 6 wherein said measurement is of the pressure of fluids in said isolated zone.

8. The method of claim 6 wherein said measurement is of the hydrostatic pressure of fluids in the well bore above said isolated zone.

9. The method of claim 6 wherein said measurement is of the temperature of fluids within said tool string.

10. The method of claim 6 wherein said tool string includes upper and lower inflatable packers for isolating a zone of a well bore, and wherein said measurement is of the inflation pressure applied to said packers.

11. The method of claim 10 wherein said measurement is the pressure of fitlids in said isolated zone.

13. The system of claim 10 wherein said housing includes receiver means adjacent the lower end thereof, the lower one of said transducer means having a lower portion thereof extending into said receiver means and including port means;

and further including passage means communicating said port means with the interior of said housing below said lower transducer means.

14. The system of claim 10 wherein a third one of said transducer means includes means for measuring the temperature of fluids in said passageway.

15. The system of claim 10 wherein said transmitting means includes a sub which is connected to each of said transducer means by switching means to enable consecutive sampling of the measurements made thereby;

and wherein said transmission means includes means for providing an output signal which is representative of said sampling when said sub receives a command signal from the surface.

16. The system of claim 15 further including means at the surface for processing said signals received from said sub and for displaying values of each of said measurements.

17. The system of claim 15 wherein said transmitting means includes a conductor cable that extends from said transmission sub to the surface through said running string, and wherein said command signal is a binary encoded command signal sent down said conductor cable and which is addressed to said transducer means.

18. The system of claim 17 including the further step of causing said transducer means to respond to said command signal with a reply signal that is binary encoded to represent a measurement made by said transducer means.

19. The system of claim 18 including the further step of transmitting said encoded reply signal to the surface via said conductor cable.

20. The system of claim 19 including the step of storing said reply signal in a memory.

21. The system of claim 19 wherein said sending and causing steps are performed repeatedly in a sequential manner;

and including the further steps of recovering noise signals and averaging the data represented by said reply signals.

22. The system of claim 21 including the further steps of recording the data signals and plotting same to provide a visible display of said data and any trends in the values thereof.

12. A well treating system including a tool string having inflatable packer means and adapted to be lowered into a well on a running string, said tool string including:

an elongated tubular housing;

a plurality of transducer means and a transmission sub mounted end-to-end in said housing;

means for transmitting measurements made by said transducer means upward to the surface through said running string;

means providing a flow passage space between the exterior of said transducer means and said transmission sub and the inner walls of said housing to enable fluids to flow past said transmission sub and transducer means;

means included in one of said transducer means to measure a property of said fluid in said flow space; and

port means in said housing adjacent another of said transducer means for communicating fluids in the well bore externally of said housing to said other transducer means to enable measurement of a property of fluids externally of said housing.