Method achieving transformation of time and depth through change in weight of downhole tool

Abstract

The invention discloses a method achieving transformation of time and depth through change in weight of a downhole tool. A mud pressure sensor is connected to a mud stand tube, a depth sensor is connected to a rotary drum of a drilling crew, a hook loading tension sensor is connected to a dead line of a crown block roller, and a winch code sensor and the hook loading tension sensor are utilized to collect data, wherein the winch code sensor is connected with the winch rotary drum of the drilling crew and inducts rotary motion of winch wheels of a whole logging process when works, and output signals can work out angle speed of the rotary motion through coding. The hook loading tension sensor is arranged on the dead line which is connected to the crown block roller and judges motion condition of the tool through measuring and collecting changing signals of sensor tension in processes of putting down, stopping and lifting of a sleeve and the tool in a well. Effective motion time is collected through a collecting circuit and is stored in a chip. A relationship among the angle speed, radius and time is utilized to finish transformational relation between the time and the depth. The tools and devices used by the method are simple and fast and convenient to operate, and measurement and data collecting efficiency and the accuracy rate are high.

Description

technical field [0001] The invention relates to the technical field of well logging, in particular to a method for realizing time and depth conversion through weight changes of downhole instruments and tools. Background technique [0002] In the process of drilling, mud logging and through-bit logging, more accurate depth measurement is required. Without accurate depth data, the measurement of downhole instruments is meaningless. Especially during the logging process of each instrument downhole after the drilling is completed, the sending and releasing of the instrument, and the time for loading and lifting the in-hole instrument after the logging is completed, all need to be transmitted to the uphole data storage and processing equipment in real time and accurately. The measurement, transmission and processing of these data need to convert the amount of time the tool goes into the well into the depth data. The existing method of converting the time of the tool downhole and ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a method for realizing time and depth conversion through the weight change of downhole instruments and tools, which solves the problem of low efficiency and accuracy of the conversion method for instrument downhole time and depth data measurement in the existing logging process. Need more equipment and personnel, and the problem of cumbersome data volume

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