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Method-and-apparatus-for-generating-a-video-display-from-signals-produced-by-borehole-scanning

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Method and apparatus for generating a video display from signals produced by borehole scanning

Details

Inventors: Mount, II, Houston B.; Morris, Steven A.;
Assignee: Amoco Corporation (Chicago, IL)
Primary Examiner: Britton; Howard W.
Assistant Examiner: Kostak; Victor R.
Attorney, Agent or Firm:

Apparatus for creating a video display from information generated by acoustically scanning a reflecting boundary circumferential of a borehole. A downhole tool generates a first signal each time a rotating transducer therein passes through magnetic north. Acoustic pulses emitted from the transducer are radially transmitted toward a borehole reflecting boundary. At least a portion of each pulse is reflected back to the transducer where the same is detected and converted to an electrical pulse representative of the reflected acoustic pulse. The peak of each electrical pulse is detected and the value digitized. A series of different addresses is associated with each digital value from a single 360.degree. borehole scan and the same are accumulated in a RAM with each digital value being stored therein at its associated address. A central processing unit selects a block of video memory locations in a video memory responsive to the magnetic north signal. The data stored in the RAM is transferred directly to the video memory by applying the RAM addresses, as the data is read out thereof, to the video memory thus transferring the data to the selected block of video memory locations. An address generator is provided for rapidly reading data from the video memory for generating a video display therefrom.

DETAILED DESCRIPTION The instant invention comprises a method and apparatus for creating video display signals from information generated by acoustically scanning a reflecting boundary circumferential of a borehole.
Such scanning generates a first signal representative of the geographic orientation of a transducer acoustically scanning such a reflecting boundary and a second series of signals representative of acoustic reflections from the reflecting boundary.
The method of the invention includes the steps of generating a series of different addresses, each of which is associated with a different second signal.
Each second signal is stored in a data storage memory location determined by the address associated therewith, thus forming a set of video precursor data.
A block of memory locations is selected in a video memory responsive to the first signal.
The block includes a plurality of locations sufficient for storing a set of video precursor data.
Thereafter, a set of video precursor data is transferred to the thus-selected block of the video memory.
Additional sets of precursor data may be transferred in the same manner.
The apparatus of the invention includes means for performing the steps of the method of the invention.

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