Time synchronization method for downhole instrument
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of time synchronization and synchronous messages, which is applied in the direction of synchronization devices, digital transmission systems, electrical components, etc., can solve the problems of large time error, low precision, and inaccurate time, and achieve the effect of reducing the degree of coupling
Inactive Publication Date: 2012-08-22
CNPC GREATWALL DRILLING ENG
View PDF4 Cites 6 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0004] 1. Each logging equipment is related to the ground control equipment, and the whole system is highly coupled. Adding any new logging equipment requires changing the source code of the ground control equipmen
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
example
[0056] According to an example of the present invention, the logging system may include a plurality of logging devices distributed downhole and control devices on the ground, each logging device includes respective sensors, clocks, amplifiers, A / D converters and Microprocessor etc. The logging equipment is connected through a wired or wireless network. The logging equipment is also wired or wirelessly connected to surface control equipment. The analog signal detected by the sensor is locally converted into a digital signal, and then transmitted to the control device after being superimposed with clock encoding. The control equipment controls and manages each logging equipment and monitors the work of the whole system.
[0057] One of the logging devices can be selected as the master device, and the other logging devices as slave devices. The master and slave devices are synchronized according to the above-mentioned protocol in active mode or server-client mode.
[0058] ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention discloses a data transmission method used for multiple well logging devices and a control device, wherein the multiple well logging devices comprises a first well logging device and a second well logging device. The method comprises the following steps: the first well logging device obtains reference time; the first well logging device sends a time synchronization message; the second well logging device receives the time synchronization message; the second well logging device modifies local time; the first well logging device and the second well logging device print a timestamp for well logging data; and the first well logging device and the second well logging device convey the well logging data to the control device.
Description
technical field [0001] The invention relates to a time synchronization method for downhole instruments. Background technique [0002] Well logging, also known as geophysical well logging or petroleum well logging, referred to as well logging, is a method of measuring geophysical parameters using the electrochemical properties, electrical conductivity, acoustic properties, radioactivity and other geophysical properties of rock formations, which belongs to applied geophysical methods (Including gravity, magnetic, electric, seismic, logging). Generally, it can be divided into electrical logging, sonic logging, radioactive logging, formation dip logging, gas logging, formation testing logging, gas drilling logging, etc. according to the detected rock physical properties or detection purposes. All kinds of well logging equipment manufactured by using the physical principles of electricity, magnetism, sound, heat, and nuclear are lowered into the well by the logging cable, so tha...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more