JP3249300B2 - Underground data transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground data transmission apparatus for transmitting underground information to the ground in real time when drilling an oil or gas well.

[0002]

2. Description of the Related Art In recent years, in order to reduce drilling costs and improve safety of oil and gas wells, to obtain drilling information and control drilling immediately, drilling information and stratum information are drilled in real time. MWD (Measurement W
A measuring system called "hile drilling" is used.

FIG. 16 is a block diagram showing a conventional underground data transmission apparatus for transmitting underground data using electromagnetic waves by this measurement system. The MWD technology is described in IEEJ Journal Vol. 112, No. 11 (published in 1992).
Since it is described on pages 77 to 884, a detailed description thereof will be omitted.

In FIG. 16, reference numeral 1 denotes a drilling rig provided on the ground, and 2 denotes a drill pipe supported by the drilling rig 1 and rotated in a well. The drill pipe 2 has a certain length and is provided with screws at both ends. As the well becomes deeper during drilling, the drill pipe 2 is successively added to increase the overall length.

[0005] A drill collar 2 a as shown in FIG. 17 is connected to the end of a series of drill pipes 2.
Further, a drill bit 2b, which is a cutting blade, is attached to a tip of the drill bit, and a well is drilled by rotation of the drill pipe 2.

Reference numeral 3 denotes a mud pump for feeding water (called mud) mixed with mud into the drill pipe 2 from the ground, and reference numeral 3a denotes a mud tank for storing the mud.
The mud in the mud tank 3a is pumped downward into the drill pipe 2 by the mud pump 3 and reaches the drill bit 2b, then passes between the well and the drill pipe 2 and turns to the ground. It is returned to the muddy water tank 3a again.

[0007] Reference numerals 5a to 5n denote various underground data detectors as shown in FIG. 18 for sensing information required for excavation at the bottom of the pit, which are mounted in the drill collar 2a and have the following underground data. Data is detected. That is, the underground data includes drill bit load,
Drill bit torque, bending moment, vibration value, pressure, etc. are well information, such as bearing (to evaluate whether the well is drilled in a predetermined direction), inclination, etc. , Stratum resistivity (electrical resistance),
Temperature.

A drill collar 2 as shown in FIG.
In the tip part of a, 4b is a modulator that modulates various detection signals from the detectors 5a to 5n at the bottom of the pit during excavation and sends the signals to the transmitter 4. The transmitter 4 transmits the signal from the modulator 4b. Amplify and output to transmission antenna.

Further, in FIG. 17, reference numeral 4a denotes a generator for supplying operating power to the transmitter 4, the modulator 4b, the detector and the like, and 4g denotes a rotor blade of a turbine which rotates by the flow of muddy water. The machine 4a rotates to generate power. 4h is a turbine vane that changes the direction of the flow of muddy water.

The transmitter and the detectors 5a to 5n including the transmitter 4, the modulator 4b and the like are accommodated in a storage container 4f in a drill collar 2a as shown in FIG. Sealed to prevent In addition, the generator 4a, the moving blade 4g of the turbine, and the stationary blade 4h are connected to the upper part thereof.

On the other hand, in FIG. 18, reference numeral 4c denotes a transmitting antenna mounted on a part of the outer peripheral portion of the drill collar 2a via an insulating material 4e, and is fixed by a bolt 4d insulated and mounted on the drill collar 2a. Further, the bolt 4d is electrically connected to the transmitter 4 through the drill collar 2a.

In FIG. 16, reference numeral 6 denotes a receiving antenna provided on the ground, 7 denotes a receiving amplifier, and 8 denotes a receiving amplifier.
A demodulation device 9 for demodulating a signal from the demodulation device 8; A / D conversion of the signal from the demodulation device 8;
Is a display device for displaying or alarming data from the data processing device 9.

Here, the power of the transmitter 4 is sent to a transmitting antenna 4c, from which an electromagnetic wave is transmitted into the formation and received by a receiving antenna 6 on the ground.

Next, the operation will be described. Drilling of oil or gas wells is performed by sequentially connecting a drill pipe 2 to a drill collar 2a in a drilling rig 1 and rotating a drill bit 2b attached to a tip of the drill collar 2a. During the drilling, the drilling mud in the mud tank 3a is sent out from the mud pump 3 and circulated to the mud tank 3a through the drill pipe 2, the drill bit 2b and the pit wall, and the drilling debris is carried out to the ground.

In the drill collar 2a near the pit bottom, detectors 5a to 5a for detecting the above-mentioned formation information and excavation information are provided.
n and a transmitter 4 for transmitting the data of the detectors 5a to 5n to the ground, and the generator 4a driven by muddy water is mounted near the transmitter 4. Then, when the drilling mud is sent out from the mud pump 3 and reaches the specified flow rate,
The generator 4a is activated by the rotation of the turbine blade 4g,
Power is supplied to the transmitter 4. The transmitter 4 has detectors 5a to
The detection data from 5n is collected, modulated by the modulator 4b, and transmitted to the ground.

The signal transmitted from the transmitter 4 is received by a receiving antenna 6, filtered and amplified by a receiving amplifier 7, and input to a demodulation device 8. The demodulator 8 demodulates the input signal and converts it into data collected by the detector.

In the data processing device 9 , the demodulation device 8
A matching process is performed between the demodulated data and ground information such as time and depth, and the display device 10 displays the data.

FIG. 19 shows an outline of the operation sequence in this case. According to this, in the figure, the muddy water pump 3 is activated as shown in FIG.
When the specified value is reached as shown in (b), the generator 4a is activated and the transmitter 4 collects the data of the detector and starts the transmission at the preset transmission interval T in advance as shown in FIG. 19 (c). I do. It receives the transmission data via the receiving antenna 6 on the ground, demodulates by demodulator 8 receives an output as shown in FIG. 19 (d) to the data processing unit 9. This operation is repeated during muddy water circulation. The mud pump 3 is controlled on and off in accordance with the excavation environment.

[0019]

Since the conventional underground data transmission apparatus is configured as described above, data transmission from the pit is intermittent depending on the on / off state of the mud pump 3. When the reception of the data signal becomes impossible, the cause of the reception failure is a change in the excavation environment such as a change in the state of the muddy water flow in the muddy water pump 3, for example, the operation or stoppage of the pump 3 or a change in the muddy water flow rate (outside the specified flow rate range). Or an abnormality in the underground transmission system, for example, an abnormality in the underground transmitter 4, an abnormality in the receiving antenna 6 and the receiving amplifier 7, a decrease in reception level, an increase in noise, or a disconnection of a wiring cable. In order to make a determination, it is necessary to constantly monitor the excavation environment and received data, and this requires a high level of technology and a great deal of time.

The invention of claim 1 has been made in order to solve the above-mentioned problems. Underground data capable of easily determining an abnormality in an underground transmission system such as an underground transmitter or a receiving antenna. The purpose is to obtain a transmission device.

It is another object of the present invention to provide an underground data transmission apparatus capable of easily determining an abnormality of an underground transmission system from an operation state of a muddy water pump.

A third object of the present invention is to provide an underground data transmission apparatus capable of easily determining an abnormality of an underground transmission system from the flow rate of drilling mud.

A fourth object of the present invention is to provide an underground data transmission apparatus capable of easily determining an abnormality of an underground transmission system from the discharge pressure of a mud pump.

A fifth object of the present invention is to provide an underground data transmission apparatus capable of easily determining an abnormality of an underground transmission system from the number of strokes of a mud pump.

It is another object of the present invention to provide an underground data transmission apparatus capable of easily determining an abnormality in an underground transmission system from the rotation speed of a driving machine in a muddy water pump.

[0026]

The underground data transmission apparatus according to the first aspect of the present invention includes a mud flow state change detecting means for detecting a change in state of the mud flow by the mud pump, and the mud flow state change detecting means. If the underground data is not output during the output period of the mud flow state signal detected by the above, the abnormality determination means is caused to determine that the underground transmission system is abnormal.

In the underground data transmission apparatus according to a second aspect of the present invention, the muddy water flow state change detecting means is a muddy water pump operating state detector for detecting a change in the operating state of the muddy water pump.

According to a third aspect of the present invention, in the underground data transmission device, the muddy flow state change detecting means is a muddy flow detector for detecting a change in the flow rate of the drilling muddy water.

According to a fourth aspect of the present invention, in the underground data transmission apparatus, the muddy flow state change detecting means is a muddy water pressure detector for detecting a discharge pressure of a muddy water pump.

According to a fifth aspect of the present invention, in the underground data transmission device, the muddy water flow state change detecting means is a stroke detector for detecting the number of strokes of the muddy water pump.

According to a sixth aspect of the present invention, in the underground data transmission apparatus, the muddy water flow state change detecting means is a driving machine rotational speed detector for detecting the rotational speed of the driving machine for the muddy water pump.

[0032]

The underground data transmission device according to the first aspect of the present invention determines an abnormality of the underground transmission system by comparing the underground data with the mud flow state change signal.

The underground data transmission device according to the second aspect of the present invention determines an abnormality in the underground transmission system by comparing the operation signal of the muddy water pump with the underground data.

The underground data transmission device according to the third aspect of the present invention determines an abnormality in the underground transmission system by comparing the flow rate of the drilling mud with the underground data.

The underground data transmission device according to the fourth aspect of the present invention determines an abnormality in the underground transmission system by comparing the discharge pressure of the muddy water pump with the underground data.

The underground data transmission device according to the fifth aspect of the present invention determines an abnormality of the underground transmission system by comparing the number of strokes of the muddy water pump with the underground data.

The underground data transmission apparatus according to the sixth aspect of the present invention determines an underground transmission system abnormality by performing a comparison operation between the rotation speed of the driving machine for the muddy water pump and the underground data.

[0038]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG.
In the figure, 11 is a muddy water pump operating state detector as muddy water flow state change detecting means attached to the muddy water pump 3;
Is an abnormality determination circuit provided as an abnormality determination unit provided in the data processing device 9 . The receiving antenna 6, the receiving amplifier 7, the demodulating device 8, and the above-described transmitter and transmitting antenna (not shown) constitute an underground transmission system. In addition,
The other components that are the same as those shown in FIG. 16 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 2 shows an outline of the operation sequence of the abnormality determination circuit 12. In the figure, FIGS.
The process up to (d) is the same as the conventional one. The receiving antenna 6, the receiving amplifier 7, the demodulation device 8 and the line connecting them constitute a terrestrial transmission system.

Next, the operation will be described. Mud pump 3
The operation state, for example, the operation state of the operation switch and the contact point of the contactor is detected by the muddy water pump operation state detector 11, and the detection output is input to the abnormality determination circuit 12, and as shown in FIG. After the operation of the muddy water pump 3, an initial set time T ₀ (time from the start of muddy water circulation to the start of transmission by the transmitter 4) is set.

On the other hand, the detection data transmitted from the transmitter 4 is input to the demodulation device 8 via the reception antenna 6 and the reception amplifier 7, and the transmission interval T is set for the demodulated data at each end of the demodulation. A signal as shown in FIG. 2 (f) is generated, and an abnormality determination is performed from the two signals as shown in FIGS. 2 (e) and 2 (f). That is, in the figure, if the mud pump is in operation at time A (FIG. 2 (e)) and data is demodulated (FIG. 2 (f)), the underground transmission system is normal, No abnormal signal is output,
If the above-described demodulated data is not generated even though the muddy water pump 3 is operating as indicated by time B, an abnormal signal is output as illustrated in FIG. The data processing device 9 can determine this as an abnormality of the underground transmission system. Then, this is displayed on the display device 10.

Embodiment 2 FIG. FIG. 3 shows a second embodiment of the present invention.
Reference numeral 1 denotes a muddy water flow rate detector such as an electromagnetic flowmeter as muddy water flow state change detecting means, which is installed between the muddy water pump 3 and the drill pipe 2. Reference numeral 22 denotes an abnormality determination circuit provided as an abnormality determination unit provided in the data processing device 9 . In addition,
The other components that are the same as those shown in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

FIG. 4 shows an outline of the operation sequence of the abnormality determination circuit 22 described above. In the figure, FIG.
The process up to (d) is the same as the conventional one.

Next, the operation will be described. First, the flow rate of the muddy water is constantly monitored by the muddy water flow rate detector 21, and the output of the muddy water flow rate detector 21 is input to the abnormality determination circuit 22, and as shown in FIG. to) to determine the preset in the operable range of flow generator 4a to be mounted on a 4, after reaching the prescribed flow rate value, the initial time T ₀ is set.

On the other hand, the detection data transmitted from the transmitter 4 is input to the demodulation device 8 via the reception antenna 6 and the reception amplifier 7, and the demodulated data here is set with the transmission interval T every time the demodulation is completed. , And signals as shown in FIG. Then, abnormality determination is performed based on signals as shown in FIGS. That is, in the figure, if the drilling mud exceeds the predetermined flow rate at time A (FIG. 4 (e)) and the data is demodulated (FIG. 4 (e)).
(F)) The underground transmission system is normal, and no abnormal signal is output at this time. However, despite the mud flow rate as shown in time B is within a predetermined value, if the demodulated data as described above is generated, an abnormal signal as shown in FIG. 4 (g) is outputted, the data processing device 9 determines this as an abnormality of the underground transmission system and displays it on the display device 10.

In this embodiment, the muddy water flow rate detector 21
Is provided in the pipe 23 between the mud pump 3 and the drill pipe 2 to detect the discharge flow rate of the mud pump 3, but as shown in FIG. 5, the mud flow detector 21 is connected to the mud pump 3 and the mud pump 3. The suction flow rate of the muddy water pump 3 may be detected by being provided on the pipe 24 between the tank 3a and the same effect as in the above embodiment. Further, as shown in FIG. 6, a muddy water flow rate detector 21 may be provided at the entrance side of the muddy water tank 3a to detect the muddy water flow rate returning from the pit bottom, and the same effect as in the above embodiment can be obtained.

Embodiment 3 FIG. FIG. 7 shows a third embodiment of the present invention.
Reference numeral 1 denotes a muddy water pressure detector serving as muddy water flow state detecting means, which is installed at the outlet side of the muddy water pump 3. 32 de
This is an abnormality determination circuit as abnormality determination means provided in the data processing device 9 . In addition, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 8 shows an outline of the operation sequence of the abnormality determination circuit 32. In the figure, FIG. 8 (b) shows the discharge pressure of the mud pump 3 detected by the mud pressure detector 31, which is obtained as an output which is substantially proportional to the mud water circulation amount.

Next, the operation will be described. First, the output of the muddy pressure detector 31 that detects the discharge pressure of the muddy water pump 3 is input to the abnormality determination circuit 32. The abnormality determination circuit 32 sets an initial time T ₀ when the pressure exceeds a preset pressure value, as shown in FIG. On the other hand, the detection data transmitted from the transmitter 4 is input to the demodulation device 8 via the reception antenna 6 and the reception amplifier 7, and the demodulated data is set at the transmission interval T every time the demodulation is completed. The signal of f) is generated. And FIG.
An abnormality is determined from signals as shown in (e) and (f).

That is, in the figure, if the mud pressure exceeds the set value at time A (FIG. 8 (e)) and the data is demodulated (FIG. 8 (f)), The underground transmission system is normal, and no abnormal signal is output at this time. However, as shown in time B, to be produced even though the demodulated data muddy water pressure exceeds the set value, the abnormality signal as shown in FIG. 8 (g) is output, data
The data processing device 9 determines that this is an abnormality of the underground transmission system, and outputs and displays it on the display device 10.

Embodiment 4 FIG. FIG. 9 shows a fourth embodiment of the present invention.
1 is a stroke detector as a muddy water flow state change detecting means, which is installed in the muddy water pump 3. 42 is the day
An abnormality determination circuit as abnormality determination means provided in the data processing device 9 .

Since the mud pump 3 used for excavation is required to have high pressure and large flow characteristics, a reciprocating pump is generally used. 10 , 30a is a cylinder, 30b is a piston sliding in the cylinder 30a, 30c is a connecting rod connected to the piston 30b,
30d is a converter, 40 is a drive unit connected to the other end of the connecting rod 30c, and these constitute the muddy water pump 3. The other components that are the same as those shown in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

Next, the operation will be described. Now, the driving machine 40 (an engine or an electric motor is generally used)
Is driven, the rotational power of this is converted to a power converter 30d.
The reciprocating motion causes the piston 30b to reciprocate via the connecting rod 30c. Therefore, in synchronization with the reciprocating motion of the piston 30b, the drilling mud is sucked into the cylinder 30a, and is subsequently pumped to the drill pipe 2.

At this time, the stroke detector 41 detects the reciprocating motion of the connecting rod 30c with a sensor such as a limit switch as shown in the figure, and outputs a signal. here,
The flow rate of the muddy water discharged per one reciprocation (stroke) of the piston 30b is known, and therefore, the flow rate of the muddy water can be calculated by detecting the number of strokes per unit time.

FIG. 11 shows an outline of the operation sequence of the abnormality determination circuit 42. FIG. 11B shows the number of strokes per unit time of the muddy water pump 3 detected by the stroke detector 41. The output of the stroke detector 41 is input to the abnormality determination circuit 42.

The abnormality determination circuit 42 sets an initial time T ₀ when the number of strokes per unit time exceeds a preset value, as shown in FIG. On the other hand, the detection data transmitted from the transmitter 4 is input to the demodulation device 8 via the reception antenna 6 and the reception amplifier 7, and the demodulation data demodulated here is set at the transmission interval T every time the demodulation is completed. The signal of (f) is generated. And
An abnormality is determined from signals as shown in FIGS. That is, in the figure, if the number of strokes per unit time of the muddy water pump 3 at the time A exceeds the set value (FIG. 11 (e)), and the data is demodulated (FIG. 11 (e)). (F)) The underground transmission system is normal, and no abnormal signal is output at this time. However, as shown in time B, if demodulated data is not generated even though the number of strokes exceeds the set value, FIG.
Abnormality signal is outputted as shown in (g), the data processing instrumentation
The device 9 determines that this is an abnormality of the underground transmission system, and displays it on the display device 10.

Embodiment 5 FIG. FIG. 12 shows a fifth embodiment of the present invention.
Reference numeral 51 denotes a driving machine rotation speed detector as muddy water flow state changing means, which detects the rotation speed of the driving machine in the muddy water pump 3. Reference numeral 52 denotes an abnormality determination circuit provided as an abnormality determination unit provided in the data processing device 9 .

The mud pump 3 is generally driven by a drive such as an engine or an electric motor. FIG. 13 shows the internal configuration of the muddy water pump 3, in which 40 is a driving machine, 30a is a cylinder, 30b is a piston sliding in the cylinder 30a, 30c is a connecting rod, 30d is a power converter, and 30e is a driving machine. The power shaft of the machine 40. The driving machine rotation speed detector 51 is provided in the vicinity of the power shaft 30e as shown in the figure, and detects the rotation speed thereof by a sensor such as a limit switch.

FIG. 14 shows an outline of the operation sequence of the abnormality determination circuit 52 described above. In the figure, FIG.
(B) shows the rotation speed of the muddy water pump 3 drive unit 40 detected by the drive unit rotation speed detector 51.

Next, the operation will be described. First, the output of the driving machine rotation speed detector 51 that detects the rotation speed of the power shaft 30e is input to the abnormality determination circuit 52. The abnormality determination circuit 52 sets an initial time T ₀ when the number of rotations exceeds a preset value, as shown in FIG.
On the other hand, the detection data transmitted from the transmitter 4 is input to the demodulation device 8 via the reception antenna 6 and the reception amplifier 7, and the demodulation data demodulated here is transmitted at the transmission interval T every time demodulation is completed.
Is set, and the signal of FIG. 14 (f) is generated. Then, abnormality determination is performed from signals as shown in FIGS.

That is, in the figure, if the rotation speed of the driving device 40 of the muddy water pump 3 exceeds the set value at the time A (FIG. 14 (e)), and the data is demodulated. (FIG. 14F), the underground transmission system is normal, and no abnormal signal is output at this time. However, to be generated even though the demodulated data the rotational speed exceeds the set value as shown in the time B, the output error signal as shown in FIG. 14 (g), the data processing device 9 which Is determined to be an abnormality in the underground transmission system, and output and displayed on the display device 10.

In the above embodiment, the case where the data demodulation output signal of the demodulation device 8 is used to determine the abnormality of the underground transmission system has been described.
A reception signal of underground data such as an output signal of the data processing device 9 may be used, and the same effects as those of the above embodiment can be obtained.

In the above embodiment, the abnormality determining circuit 1
Although 2, 22, 32, 42, and 52 are provided in the data processing section 9, they may be configured independently, and the same effects as those of the above-described embodiment can be obtained.

Further, as shown in FIG. 15, in the inclined shaft, since the two rows of drill pipes are oblique, extra distortion is applied to the drill collar 2a and the like. In such a case, if this underground data transmission device is used. This is effective for diagnosing an abnormality in the underground transmission system.

[0065]

As described above, according to the first aspect of the present invention, the muddy water flow state change detecting means for detecting the change in the state of the muddy water flow by the muddy water pump is provided. If the underground data is not output during the mudflow state signal output period, the underground transmission system is configured to determine that the underground transmission system is abnormal. There is an effect that a system abnormality can be easily determined.

According to the second aspect of the invention, the muddy water flow state change detecting means is configured to be a muddy water pump operating state detector for detecting a change in the operating state of the muddy water pump. Is easily determined from the operation state of the muddy water pump.

According to the third aspect of the present invention, the muddy water flow state change detecting means is configured as a muddy water flow rate detector for detecting a change in the flow rate of the drilling muddy water. There is an effect that what can be easily determined from the flow rate of the drilling mud is obtained.

According to the fourth aspect of the present invention, since the muddy water flow state change detecting means is configured as a muddy water pressure detector for detecting the discharge pressure of the muddy water pump, the abnormality of the underground transmission system can be detected by the muddy water pump. There is an effect that an object that can be easily determined from the discharge pressure is obtained.

According to the fifth aspect of the present invention, since the muddy water flow state change detecting means is constituted as a stroke detector for detecting the number of strokes of the muddy water pump, the abnormality of the underground transmission system can be detected by the stroke of the muddy water pump. There is an effect that what can be easily determined from the number of times is obtained.

According to the sixth aspect of the present invention, the muddy water flow state change detecting means is configured as a driving machine rotation speed detector for detecting the rotation speed of the driving machine for the muddy water pump. There is an effect that an abnormality can be easily determined from the rotation speed of the driving machine in the muddy water pump.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an underground data transmission device according to an embodiment of the present invention.

FIG. 2 is a timing chart of signals in each section of the underground data transmission device in FIG.

FIG. 3 is a configuration diagram showing an underground data transmission device according to an embodiment of the present invention.

FIG. 4 is a timing chart showing signals of respective units of the underground data transmission device in FIG.

FIG. 5 is a configuration diagram showing a main part of an underground data transmission device according to another embodiment of the present invention.

FIG. 6 is a configuration diagram showing a main part of an underground data transmission device according to still another embodiment of the present invention.

FIG. 7 is a configuration diagram showing an underground data transmission device according to an embodiment of the present invention.

8 is a timing chart showing signals of respective units of the underground data transmission device in FIG.

FIG. 9 is a configuration diagram illustrating an underground data transmission device according to an embodiment of the present invention.

FIG. 10 is a configuration diagram showing details of a muddy water pump in FIG. 9;

11 is a timing chart showing signals of each section of the underground data transmission device in FIG.

FIG. 12 is a configuration diagram showing an underground data transmission device according to an embodiment of the present invention.

FIG. 13 is a configuration diagram showing details of a muddy water pump in FIG. 12;

FIG. 14 is a timing chart showing signals of respective units of the underground data transmission device in FIG.

FIG. 15 is a schematic diagram showing a state of excavation of a shaft.

FIG. 16 is a configuration diagram showing a conventional underground data transmission device.

17 is a sectional view showing an internal structure of the drill collar in Fig. 16.

18 is a connection diagram showing the underground data transmission unit provided in the drill collar in Fig. 16.

19 is a timing chart showing a signal of a ground data transmission system each unit in FIG. 16.

──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. ⁷ Identification symbol FI G01V 3/34 G08C 19/00 H04B 13/02 (56) References JP-A-63-78991 (JP, A) JP-A-3 JP-A-219396 (JP, A) JP-A-4-23534 (JP, A) JP-A-4-177598 (JP, A) JP-A-4-177919 (JP, A) (58) Fields investigated (Int. . ^7, DB name) E21B 47/12 G01N 27/04 G01V 3/34 G08C 19/00 H04B 13/02

Claims (6)

(57) [Claims] An underground data transmission apparatus for excavating a well by an excavator while forcibly circulating muddy water between a mud pump and a well, and transmitting the underground data during the excavation to the ground using a transmission / reception means, A mud flow state change detecting means for detecting a change in the state of the mud flow by the mud pump, and a ground signal when the underground data is not output during the output period of the mud flow state signal detected by the mud flow state change detecting means. An underground data transmission device comprising: an abnormality determination unit configured to determine an abnormality in an underground transmission system. 2. The underground data transmission device according to claim 1, wherein the muddy water flow state change detecting means is a muddy water pump operating state detector that detects a change in the operating state of the muddy water pump. 3. The underground data transmission device according to claim 1, wherein the mudflow state change detecting means is a mudflow detector for detecting a change in the flow rate of the drilling mud. 4. The underground data transmission device according to claim 1, wherein the muddy water flow state change detecting means is a muddy water pressure detector that detects a discharge pressure of a muddy water pump. 5. The underground data transmission device according to claim 1, wherein the muddy water flow state change detecting means is a stroke detector that detects the number of strokes of the muddy water pump. 6. The underground data transmission device according to claim 1, wherein the muddy water flow state change detecting means is a driving machine rotation speed detector for detecting a rotation speed of a driving machine for a muddy water pump.