Method for monitoring hole depth in drilling process of cable drill pipe

A drill pipe and hole depth technology, which is applied in the field of monitoring hole depth during wired drill pipe drilling, can solve the problems of not being able to detect the depth of drill pipe holes in real time, and achieve high-quality completion of drilling tasks, easy implementation, and obvious effects

Inactive Publication Date: 2014-04-09
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the center-through cable-type high-strength large through-hole drill pipe cannot detect the hole depth in real time during the drilling process in the prior art, and provide a real-time monitoring hole depth without manual correction. Methods

Method used

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  • Method for monitoring hole depth in drilling process of cable drill pipe
  • Method for monitoring hole depth in drilling process of cable drill pipe
  • Method for monitoring hole depth in drilling process of cable drill pipe

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: The method of the present invention is applied to the measurement of the hole depth in the drilling process of a large through-hole wired drill pipe that can measure the hole depth, and is measured according to the following steps:

[0028] ⑴. First, improve the existing common center-through cable-type high-strength large through-hole drill pipe, that is, insert a high-precision resistor 3 with the same resistance value at one end of the drill pipe through-hole cable in each large through-hole drill pipe; The drill pipe cable at the bottom is connected to the signal transmitting end of the probe tube 7, and the transmit signal is provided by a 12V DC level. The signal ground wire is connected to the lower drill pipe through the probe tube 7 bracket, and then connected to the ground resistance 1 to form a closed loop; Transform the ordinary central cable type high-strength large through-hole drill pipe into a large through-hole wired drill pipe with measura...

Embodiment 2

[0035] Embodiment 2: The method for monitoring the hole depth during the drilling process of the present invention is the same as that of Embodiment 1, except that the resistance value of the ground resistance 1 and the selection of the high-precision resistance 3 in the drill pipe are different. The resistance value of ground resistance 1 is selected as 10kΩ.

[0036] Selection of high-precision resistance in the drill pipe: according to the size of the cable male joint 18, two identical conductive circular metal sheets 21 and a polymer resin insulating ring 15 are made. see image 3 , the metal sheet 21 is made of copper with very low resistivity, and its thickness is 5mm. The height of the polymer resin insulating ring 15 is 12mm, and its central through hole accommodates the in-line high-precision resistor 16, and the resistance value of the in-line high-precision resistor is selected as 1kΩ. The in-line high-precision resistor 16 is placed in the polymer resin insulatin...

Embodiment 3

[0037] Embodiment 3: The method for monitoring the hole depth during the drilling process of the present invention is the same as that of Embodiment 1, the difference is the resistance value of ground resistance 1 and the selection of high-precision resistance in the drill pipe. The resistance value of ground resistance 1 is selected as 20kΩ;

[0038] Selection of high-precision resistors in the drill pipe: According to the size of the variable diameter spring 19 in the center-through cable-type high-strength large through-hole drill pipe, spring resistors 22 of equal size are made. see Figure 4 , the resistance value of the spring resistor 22 is 150Ω, and the variable diameter spring 19 is replaced with a spring rheostat 22 under the condition that the spring resistor 22 has sufficient strength.

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Abstract

The invention relates to a method for monitoring hole depth in the drilling process of a cable drill pipe, which is characterized in that in the method, the drill pipe is designed based on a central cable type large-through-hole drill pipe, one end of each drill-pipe cable is connected to a high-precision resistor with the same resistance, the bottommost drill-pipe cable is connected with a signal emission terminal powered by a direct-current level; a signal ground is connected with a lower drill pipe by a probe bracket, and then is connected with a ground resistor to form a closed loop; the electric potentials of the two ends of the ground resistor are acquired by using an acquisition card, then the current of the whole loop is calculated according to the Ohm's law; the value of electric potential of the upper end of a cable is subtracted from the value of level of an emitted signal to obtain the value of voltage withstood by an integral drill pipe, then the obtained value of voltage is divided by the value of current of the loop so as to obtain the total resistance of a series resistor in the integral drill pipe, the total resistance is divided by the resistance of a resistor in each drill pipe so as to obtain the number of the drill pipes in a hole, and through multiplying the number of the drill pipes by the length of each drill pipe, adding the obtained value and the length of a fixed drilling tool below the hole, and subtracting an allowance of the drill pipe from the obtained value, the calculated maximum value is the hole depth. By using the method disclosed by the invention, the hole depth can be monitored in real time without manual correction.

Description

technical field [0001] The invention relates to a method for measuring the hole depth in real time during the drilling process using a wired drill pipe in the geological and mining industry, specifically a method for monitoring the hole depth during the drilling process with a wired drill pipe, belonging to the field of geological and mineral drilling . Background technique [0002] With the continuous development of the geological and mining industry, the requirements for drilling are getting higher and higher. Wired measurement-while-drilling drilling has been widely used in the geological and mining industry because it can reflect the drilling azimuth and inclination in real time. In order to ensure safe, reliable and rapid transmission of wired measurement-while-drilling signals, center-through cable-type high-strength large-hole drill pipes are widely used. However, the hole depth measurement still relies on manual statistics of the length of the drilling tool in the h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/04E21B47/12
Inventor 邵春陈鹏飞余志鹏
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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