 Method of processing sub-images of an image field |
| What I claim is: 1. A method of image processing comprising the steps of: viewing an image field; ... |
|
| Deadlock resolution with cache snooping |
| FIG. 1 is a block diagram of a data processing apparatus according to the present invention. It is ... |
|
| Dual port memory device with improved serial access scheme |
| OF THE DRAWINGS FIG. 1 is a schematic block diagram of a dual port memory according to a prior art;... |
|
| Semiconductor memory device capable of relieving defective bits |
| Accordingly, an object of this invention is to provide a semiconductor memory device in which the ... |
|
| Protection circuit for non-volatile memory |
| What is claimed is: 1. A protection circuit for a non-volatile memory comprising: means for ... |
|
| Disk cache control unit |
| The object of the present invention is to provide a disk cache control unit which can reduce ... |
|
| Internally cached static random access memory architecture |
| The present invention, in its broadest form, is directed to a circuit for internally caching a ... |
|
| Radio communication receiving device detecting a frequency modulation preamble signal |
| The object of the present invention is to provide a radio communication receiving device that has a ... |
|
| Memory access address comparison |
| It is an aim of embodiments of the present invention to provide write protection circuitry which ... |
|
| Color television picture display device having a flicker reduction circuit |
| What is claimed is: 1. A color television picture display device comprising an analog-to-digital ... |
|
|
Method and apparatus for controlling drilling process
| Details |
Inventors: Zhilikov, Valentin V.; Motsokhein, Boris I.; Parfenov, Boris M.;
Assignee:
Primary Examiner: Ruggiero; Joseph F.
Assistant Examiner:
Attorney, Agent or Firm: Lilling & Greenspan
A method for controlling drilling process based on the use of an adaptive model of drilling process comprises two control modes of which one is a multicycle rock formation trial mode and the other mode is a drilling mode proper. During the first cycle of the trial mode the drilling speed is determined on the basis of pre-set values of controlled parameters and approximate values of coefficients of the adaptive model being corrected and this drilling speed is compared to the value of drilling speed as measured during the first cycle; and corrected values of a respective coefficient of the adaptive model being corrected are formed based on the comparison results; and, taking into account these values, the values of control signals close to optimum values are determined which are the settings for acting on the bit during the next trial mode cycle. In each next cycle the corrected coefficients of the preceding cycle are used for determining control signals. If the measured drilling speed coincides with the computed drilling speed in two consecutive cycles, the control signal formed during these cycles is the signal to be used in the drilling mode proper. Also disclosed is an apparatus for effecting the above-described method, which includes a control board, actuating mechanisms of a drilling rig, pick-ups for sensing drilling speed, bit load and bit rotary speed, and an electronic computer storing the adaptive model of drilling process. |
|
DETAILED DESCRIPTION It is an object of the invention to provide a method and apparatus for controlling drilling process which enable a reduction of well drilling time with non-optimum values of control signals acting on actuating mechanisms of a drilling rig.
It is also an object of the invention to provide conditions for rational utilization of the drilling bit life.
Another object of the invention is to provide a method in which the accuracy of determination of coefficients of an adaptive model of productionn process is comparatively high.
Finally, it is an object of the invention to improve the productivity of a drilling rig, especially under the conditions of frequent changes of lithologic properties of the rock being drilled.
This is accomplished by a method for controlling drilling process, which is based on an adaptive model of drilling process, comprising two control modes of which one mode is a mode of trial of a formation of the rock being drilled and the other mode is the drilling mode proper.
The rock formation trial mode is a multicycle mode wherein during each cycle values of control signals for drilling process are set, the drilling speed corresponding to the set values of control signals is measured and control signals are formed at the end of the cycle to be fed to respective actuating mechanisms of the drilling rig, and control signals are formed on the basis of the trial mode results to be used in the drilling mode proper and also a signal for changing over from the trial mode to the drilling mode proper is formed.
If the controlled parameters of drilling process differ from the desired parameters, a change over is effected from the drilling mode proper to the trial mode again.
According to the invention, the method also comprises determining, during the first cycle of the trial mode, the drilling speed on the basis of pre-set values of control signals and of the pre-set approximate values of the coefficients of the adaptive model to be corrected; comparing this drilling speed with the value of this speed measured during the same cycle; forming corrected values of respective coefficients of the adaptive model being corrected on the basis of the comparison results; using these coefficients to determine the values of control signals closest to optimum values, which are the settings for acting on the bit during the next trial cycle; and using the corrected coefficients from the foregoing cycle in each next cycle for determining control signals
|
|
I/O Systems 
