JPS62284890A - Transmitter for excavation measured data - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a device for transmitting data measured during oil drilling or tunnel excavation.

[Conventional technology] For example, when drilling for oil, various types of geological data, muddy water data, bit data, etc. are measured deep underground in order to control the oil drilling rig so that the drilling can be carried out without any problems. need to be transmitted to.

An oil drilling rig configured to transmit drilling measurement data will be explained with reference to FIG. 5. In the figure, 1 is an oil drilling rig, 2 is a casing, 3 is a drill pipe made of conductive materials such as various steel materials, and 4 is a drill pipe. 3 is a drill bit rotatably attached to the lower end; 5 is a sensor section with a large number of sensors for measuring various data; 6 is a transmitting antenna section for wirelessly transmitting various measured data; 7 is a A battery section for supplying power to various devices and sensors, 8 a receiving antenna section that receives data transmitted to the ground as a signal, 9 an amplifier that amplifies the signal received by the receiving antenna section 8, and 10 a receiving antenna section that receives the data transmitted to the ground as a signal. a signal demodulator for demodulating the received signal; 1;
1 is a signal processing device including a computer for processing the signal from the signal demodulator IO; 12 is an output device such as a display or printer; and 13 is the ground surface.

A conventional example of the transmitting antenna section 6 is shown in FIG. 6, in which 14 is an electrically insulating structure in which a part of the drill pipe 3 is made of an electrically insulating material such as plastic or metal fiber reinforced plastic (FRM). The body part 15 is a hollow cylindrical transformer housed concentrically with the drill pipe 3 in the electrical insulator part 14 of the drill pipe 3, and the transformer 15 is made of a magnetic material such as permalloy or silicon steel with low hysteresis loss. formed from material. Also lB is transformer 15
17 is a secondary coil similarly wound along the longitudinal direction of the transformer 15; 18 is a secondary coil wound along the longitudinal direction of the transformer 15;
is an amplifier; 19 is a circuit including a circuit that converts a parallel signal into a series signal and a circuit that modulates the signal; zO is a sensor group consisting of a large number of sensors that measure various data; The secondary coil 17 is connected to a portion of the conductive material of the drill pipe 3. The amplifier 18, the circuit 19, and the sensor group 20 are all housed within the drill pipe 3.

The measurement data during excavation sequentially measured by the sensor group 20 is converted from a parallel signal to a series signal in the circuit 19 and modulated, amplified by the amplifier 18, and impedance converted between the secondary coil 1B and the secondary coil 17. The electromagnetic waves are transmitted and transmitted as electromagnetic waves from the transmitting antenna section 6, received and amplified by the receiving antenna section 8 on the ground, demodulated by the signal demodulator 10, processed by the signal processing device 11, and then displayed or printed on the output device 12. be done.

Another conventional example of the transmitting antenna section 6 is shown in FIG.
In the figure, 21 is an annular electrical insulator such as plastic or FRM that is fitted into a hole drilled at a predetermined position of the drill pipe 3, and 22 is copper or steel that is fitted into a hole in the electrical insulator 21. 23 and 24 are electrical insulating parts such as plastic or FRM fixed to the inner and outer circumferential parts of the drill pipe 3 at the installation part of the electrical conductor part 22, and one end of the secondary coil 17 is connected to the drill pipe 3, and the other end is connected to the electrical conductor section 22. In this case as well, the data of the measurement signal amplified by the amplifier 18 is partially impedance-converted between the coil 16 and the secondary coil 17, and transmitted as an electromagnetic wave from the transmitting antenna section 6 to the receiving antenna section 8 shown in FIG. Received.

[Problems to be Solved by the Invention] However, the above-described transmission antenna section 6 of the oil drilling rig
is either of Fig. 6 or Fig. 7.

In this case, because part of the coil 1B and the secondary coil 17 are wound around the transformer housed inside the drill pipe 3, the number of turns of the coil cannot be increased. Since the structure is such that it is stored with a slight distance from the antenna, it cannot be made that long, which is the effective length of the antenna. cannot be made larger. Therefore, it is not possible to increase the transmission output with the transmitting antenna section B shown in FIGS. 6 and 7, and when the transmitting antenna section 8 is located several thousand meters deep underground, the transmission to the ground is not possible. There are problems such as the signal is attenuated during the time it takes to obtain measurement data, making it difficult to obtain measurement data efficiently.
In particular, when the antenna effective length is small compared to the wavelength, the electromagnetic wave transmission effect is poor and signal attenuation is significant.

In view of the above-mentioned circumstances, the present invention has been made with the object of increasing the output of measurement data transmitted from a transmitting antenna section.

[Means for Solving the Problems] The present invention provides a drill pipe having a drill bit at its tip for drilling underground. a member made of the material, and a plurality of turns of coils are wound around the outer periphery of the member,
A drill pipe fixed to the anti-U-shaped side end of the member is divided into four parts in the circumferential direction and formed of a magnetic member and an electrically insulating member arranged alternately, The opposite end of the U-shaped member is fixed to the magnetic member of the drill pipe.

[Operation] By passing an electric signal through the co-coil, a magnetic flux is generated in the magnetic member of the drill pipe in the longitudinal direction of the drill pipe, and a magnetic pole is generated at the end of the conductive member of the drill pipe on the side opposite to the outer cylinder. A large output electromagnetic wave is output.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

1 to 4 show an embodiment of the present invention, in which a hollow cylindrical outer tube 25 having an outer diameter approximately the same as that of the drill pipe 3 is formed from a non-magnetic material with low magnetic permeability such as stainless steel or titanium alloy. ,
A horseshoe-shaped member 26 whose lower end is bent into a U-shape is fitted into the outer cylinder 25 . The member 2B is made of a so-called soft iron material having high magnetic permeability, such as permalloy or silicon, and its upper end protrudes above the upper end of the outer cylinder 25, and its planar shape has two circular arc shapes that are symmetrical with respect to the center line. There is. A coil 27 having a large number of turns is wound around the member 26, and both ends of the coil 27 are connected to an amplifier 18 shown in FIGS. 6 and 7.

The upper part of the outer cylinder 25 of the drill pipe 3 is made of magnetic materials such as various steel materials and non-magnetic materials such as plastics and FRM, and the planar shape is two symmetrical circular arc shapes with the center line being the magnetic material. 28, and an arc-shaped part 29 made of non-magnetic stainless steel, titanium alloy, etc. which is sandwiched and fixed between the two left-right symmetrical arc-shaped parts 28, and the upper end of the arc-shaped part 28.29 reaches the ground. The lower end of the extending arcuate portion 28 is fixed to the upper end of the arcuate portion of the member 26 that protrudes above the outer tube 25, and the lower end of the arcuate portion 29 is fixed to the upper end of the outer tube 25. Thus, the transmitting antenna section 6 is formed by the member 2B, the coil 27, and the arc-shaped section 28 of the drill pipe 3.

The electric signal measured by the sensor group 20 shown in FIGS. 6 and 7 and amplified by the amplifier 18 is energized to the coil 27,
Due to the impedance converted according to the number of turns of the coil 27, a magnetic flux shown by an arrow 30 in the longitudinal direction of the drill pipe 3 is generated in the magnetic arc-shaped portion 28 of the drill pipe 3 above the member 26 and the outer cylinder 25. Due to the arc shape part 2
A magnetic pole is formed at the upper end of 8, and electromagnetic waves are generated. This electromagnetic wave is captured by the receiving antenna section 8 of FIG. 5 and processed in the same manner as in the case of FIG.

The number of turns of the coil 27 can be sufficiently increased, and since the electromagnetic wave generating section is not deep underground but at or near the ground surface, the signal output from the transmitting antenna section is large and attenuation is small. Therefore, the transmitted signal is received by the reception antenna section 8 as a large signal, so that measurement data can be obtained efficiently.

In the embodiments of the present invention, the case of an oil drilling rig has been described, but it goes without saying that the present invention can also be applied to a tunnel drilling rig, and that various other changes can be made without departing from the gist of the present invention. It is.

[Effects of the Invention] According to the excavation measurement data transmission device of the present invention, the output of the signal transmitted from the transmitting antenna section can be increased and the signal can be transmitted from the ground surface or its vicinity, so that a sufficiently large signal can be obtained. This has the excellent effect of being able to.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the excavation measurement data transmission device of the present invention, FIG. 2 is a view taken in the ■ direction of FIG. 1, and FIG. Figure 4 is a view from the ■ direction arrow in Figure 1.
Figure 5 is a general explanatory diagram of an oil drilling rig, and Figure 6 is a general illustration of an oil drilling rig.
FIG. 7 is an explanatory diagram of an example of a transmitting antenna used in the oil drilling rig shown in the figure, and FIG. 7 is an explanatory diagram of an example of the same location. In the figure, 3 is a drill pipe, 4 is a drill bit, 5 is a sensor section, 6 is a transmitting antenna section, 7 is a battery section, 8 is a receiving antenna section, 25 is an outer cylinder, 26 is a member, 27 is a coil, 28.
29 indicates an arcuate portion.

Claims (1)

[Claims] 1) A member made of a magnetic material whose end on the drill bit side has a U-shape extending in the longitudinal direction of the drill pipe is housed inside a drill pipe that has a drill bit at its tip for drilling underground, and A drill pipe wound with a plurality of turns of coils and fixed to the anti-U-shaped end of the member is divided into four in the circumferential direction and formed of magnetic members and electrically insulating members arranged alternately. An apparatus for transmitting measurement data of an excavation section, characterized in that an opposite U-shaped side end of the member whose bit side end on the drill side is U-shaped is fixed to a magnetic member of a drill pipe.