Computerized truck instrumentation system

• US 5,051,962 A
• Filed: 03/13/1989
• Issued: 09/24/1991
• Est. Priority Date: 05/04/1972
• Status: Expired due to Term

• Current Assignee: Schlumberger Technology Corporation (SLB)
• Original Assignee: Schlumberger Technology Corporation (SLB)
• Inventors: Eaton, Francis M.
• Primary Examiner(s): Moskowitz, Nelson
• Application Number:
  US07/323,188
• Time in Patent Office: 925 Days
• Field of Search: 367/34, 367/661, 367/67, 364/138, 364/223, 364/806, 346/33 WL, 346/33 C
• US Class Current: 367/33
• CPC Class Codes: G01V 1/44 using generators and receivers in the same well G01V1/52 takes precedence
• CPC Class Codes: G01V 11/00 Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
• CPC Class Codes: G01V 3/38 Processing data, e.g. for analysis, for interpretation, for correction

Abstract

In a representative embodiment of the invention described herein, a well logging system for investigating subsurface formations is controlled by a general purpose computer programmed for real-time operation. The system is cooperatively arranged to provide for all aspects of a well logging operation, such as data acquisition and processing, tool control, information or data storage, and data presentation as a well logging tool is moved through a wellbore. The computer controlling the system is programmed to provide for data acquisition and tool control commands in direct response to asynchronous real-time external events. Such real-time external events may occur, for example, as a result of movement of the logging tool over a selected depth interval, or in response to requests or commands directed to the system by the well logging engineer by means of keyboard input.

Claims

1. A well exploration system for acquiring, processing and storing well data representative of measurements obtained by a well tool adapted for investigating at least one selected characteristic of earth formations around a well bore comprising;

a surface unit;

a cable operatively connected at one end thereof to said surface unit;

a well tool adapted for movement through a well bore and suspended in the well bore at the other end of said cable;

first measuring means, supported by said well tool, for acquiring well data relating to said characteristic in response to control signals from said surface unit, said measuring means further providing output signals representative of said acquired well data;

second measuring means for providing an output including an indication of the position of said tool in said well; and

processing means, supported by said surface unit and in communication with said measuring means via said cable, for processing well data according to selected first sequences of operating steps and for providing said control signals to said first measuring means, said control signals being generated in response to the output of said second measuring means.

2. The system of claim 1 further comprising:

first means for controlling said processing means according to selected second sequences of operating steps in response to said acquired well logging data such that said selected first sequences of operating steps conforms to the data processing required for determining said characteristic.

3. The system of claim 2 further comprising:

second means for controlling said processing means to effect suspending the processing of data according to said selected first or second sequences of operating steps while said first measuring means acquires other data according to selected third sequences of operating steps.

4. The system of claim 1 wherein said control signals are generated in response to the occurrence of selected events which occur independently of the acquisition of well data by said first measuring means.

5. The system of claim 4 wherein said second measuring means further includes means for providing an output related to the position of said well tool as it moves through said well bore.

6. A well exploration system comprising:

a well exploration tool including at least one transducer means for the acquisition of indications of characteristics of subsurface geological formations surrounding a borehole;

a surface instrumentation unit including a digital computer for receiving and processing the output of said transducer means;

means, connecting said computer to said well tool, for establishing communication therebetween;

means for effecting movement of said well tool through said borehole;

means for providing an indication of the depth of said tool in said borehole to said computer; and

means responsive to an output of said computer for effecting control over the operation of said transducer;

said computer output being generated in response to the indicated position of said tool in said well.

7. The system of claim 6 wherein said communication establishing means is a cable which includes at least one electrical conductor.

8. The system of claim 7 wherein said depth indication means includes a measure wheel which rotates in response to the movement of said cable.

9. The system of claim 8 wherein said depth indication means further includes means for providing an indication of the tension to which said cable is subjected to.

10. The system of claim 6 further comprising means for recording the output of said transducer means as a function of the output of said depth indication means.

11. The system of claim 6 wherein said tool further comprises at least two spaced apart trasducers means and wherein said computer includes means for matching the outputs of said transduver means to a common depth reference.

12. The system of claim 6 further comprising:

means for detecting and communicating to said digital computer data related to the control of said system with which a plurality of different detectable characteristics are associated, including;

interfacing means, located near the location where the detectable characteristics occur for communicating with said digital computer, said interface means including;

means for converting signals representing the detectable characteristics into digitally encoded data; and

means, connected to said means for converting, for transmitting the digitally encoded data to said digital computer.

13. A well logging system for acquiring and processing well logging data which are representative of measurements provided by a well logging tool adapted for investigating characteristics of earth formations around a well bore comprising:

a well logging tool adapted for movement through a well bore;

measuring means supported by said well logging tool for acquiring well logging data relating to a selection of well bore characteristics, and for providing selected electrical outputs representative of said acquired well logging data;

processing means in communication with said measuring means for processing said acquired well logging data according to a selected sequence of processing steps for each of said selected well bore characteristics; and

means for controlling said processing means in response to said selected electrical output such that said selected sequence of processing steps used in processing said acquired well logging data conforms to the data processing required for the well bore characteristics represented by said well logging data.

14. The well logging system of claim 13 wherein said processing means is capable of processing other data in addition to said acquired well logging data.

15. The well logging system of claim 14 wherein said means for controlling include means for stopping, while said measuring means acquires other data, said processing of said acquired well logging data according to said sequence of processing steps upon receipt of certain ones of said selected electrical outputs responding to the occurrence of selected events.

16. The well logging system of claims 13, 14, or 15 wherein said processing means provides output data representative of processed data for transmitting to and controlling one of said well logging tool and said measuring means.

17. The well logging system of claim 15 and further including means for providing data related to the depth of said well logging tool at it moves through said well bore.

18. The well logging system of claim 15 wherein said selected events may occur asynchronously.

19. The well logging system of claims 13 or 14 wherein said processing means is a digital processing means and further including means for converting analog data derived from said logging tool to digital data compatible with said processing means.

20. The well logging system of claims 13, 14 or 15 and further including means for receiving data from a remote location.

21. The well logging systems of claims 13, 14 or 15 and further including means for transmitting data to a remote location.

22. The well logging system of claim 13 wherein said processing means are responsive to an information input device for modifying said sequence of processing steps.

23. The system of claim 20 wherein at least some of said selected events are representations of changes in the depth of said well logging tool as it moves through said well.

24. The system of claim 19 wherein at least some of said selected events are requests or commands produced external to said processing means.

25. The system of claim 19 further including means for initiating the transmission of data to said well logging tool in response to at least some of said selected events.

26. The well logging system of claim 17 wherein said well logging tool further includes a mechanical assembly for moving said tool through the borehole and means for transmitting an operating parameter of said mechanical assembly to said processing means including the tension of a tool-supporting cable, said parameter influencing said processing of well logging signals.

27. The well logging system of claims 13 or 15 and further including means adapted for presenting data received from said logging tool.

28. The well logging system of claim 13, 14 or 15 and further including means for presenting data processed by said processing means.

29. The well logging system of claim 16 and further including means for presenting data transmitted to said logging tool.

30. The well logging system of claim 26 and further including means for storing data received from said logging tool until it can be processed by said processing means.

31. The well logging system of claim 26 and further including means for storing data processed by said processing means.

32. The well logging system of claim 13 wherein at least one of said selected electrical outputs indicate incremental movement of said well logging tool.

33. The well logging system of claims 13, 14 or 15 further comprising interface means for coupling between said logging tool and said processing means for receiving data in a multiplicity of different forms including analog events per unit of time, time interval and digital forms from said well logging tool for processing by said processing means.

34. The well logging system of claim 17 wherein at least some of said certain ones of said selected electrical outputs are provided by said depth means.

35. The well logging system of claim 15 wherein said output data from said processing means is transmitted upon the occurrence of at least one of said selected events.

36. A method of acquiring and processing well logging data which are representative of measurements provided by a well logging tool adapted for investigating characteristics of earth formations around a well bore comprising the steps of:

moving a well logging tool through a well bore;

supporting a measuring means by said well logging tool;

acquiring well logging data relating to a selection of well bore characteristics with said measuring means;

providing selected electrical outputs from said measuring means representative of said acquired data;

receiving and processing said acquired well logging data according to a selected sequence of processing steps for each of said selected well bore characteristics; and

controlling said processing means in response to said selected electrical output such that said selected sequence of processing steps used in processing said acquired well logging data conforms to the data processing required for the well bore characteristics represented by said well logging data.

37. The method of claim 36 wherein said receiving and processing steps including stopping and said processing of said well logging data according to said sequence of processing steps while acquiring other data upon receipt of certain ones of said selected electrical outputs in response to the occurrence of selected events.

38. A method for controlling a well logging system to obtain data representative of physical measurements of subsurface earth formations from signals derived from a well logging tool, comprising:

providing a programmed digital computer interfaced to said well logging tool;

providing control circuitry for said programmed digital computer to allow said computer to receive signals corresponding to events which are external to said computer and occur asynchronously to the operation of said computer;

operating said well logging tool in a well under the control of said computer to obtain samples of a measurement of an earth formation from said subsurface well logging tool;

processinf under the control of said computer said subsurface measurement samples, to produce data representative of a physical measurement of said subsurface earth formation and to produce signals for controlling said well logging tool; and

stopping said processing under control of said computer to allow said computer to automatically respond to signals corresponding to events which are external and asynchronous to said processing.

39. The method of claim 38 wherein at least some of said events correspond to events occurring during the operation of said well logging tool.

40. The method of claim 39 wherein at least some of said events result from the operation of said well logging tool.

41. The method of claim 40 wherein at least some of said events correspond to incremental changes in the depth of said well logging tool in the well.