North Seeking Mems Imu For Gyro Tools 3 (1)

MEMS Gyroscopic Directional Module for Gyro Tools

ER-Gyro-15
1.Pioneering High Accuracy in Small Inclination: Delivers effective azimuth and tool face precision even at small well inclinations, maintaining accuracy within 3°.
2.Designed for Harsh Conditions: Features the most advanced MEMS technology and an all-solid-state design with superior shock and vibration resistance, performing reliably under intense random vibrations.

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Introduction

ER-Gyro-15 MEMS Gyroscopic Directional Module for Gyro Tools

Introduction

The ER-Gyro-15 is a compact, high-performance MEMS gyroscopic directional module designed for demanding downhole environments. Utilizing strapdown inertial measurement technology by 3-axis navigation-grade MEMS gyro and 3-axis MEMS accelerometer, it delivers reliable azimuth, inclination, and tool face data. This module is unaffected by magnetic interference—ensuring accuracy where traditional magnetic tools fail.

Core Advantages

Pioneering High Accuracy in Small Inclination:Delivers effective azimuth and tool face precision even at small well inclinations, maintaining accuracy within 3°.
Designed for Harsh Conditions:Features the most advanced MEMS technology and an all-solid-state design with superior shock and vibration resistance, performing reliably under intense random vibrations.
Rapid & Precise Alignment:Achieves 1° azimuth accuracy in just 30 seconds, and 0.5° accuracy within 90 seconds, maximizing operational efficiency.
Extreme Environmental Suitability:Fully calibrated and compensated across a wide temperature range of 5°C to 125°C.
Ultra-Compact Form Factor:Revolutionary miniaturization (ø25.4/30mm x 120mm) allows seamless integration into narrow probe spaces, unlike bulky traditional gyro tools.

Applications

Oil & Gas Drilling & Logging:for MWD/LWD in casing, tubing, or magnetically disturbed well sections.
Advanced Mining & Tunneling:Provides essential pointing for directional drilling equipment used in mineral exploration, seam tracking, and underground development. Its non-magnetic nature ensures reliability near heavy machinery and steel infrastructure.
Pipeline & Utility Installation & Inspection:Critical for the accurate mapping of pipeline routes, especially in complex directional drilling (HDD) projects.
Geotechnical & Environmental Surveying:borehole trajectory measurement for geotechnical investigation, environmental monitoring well installation, and other subsurface surveying needs where magnetic interference is a concern.

Figure 1. X,Y,Z Coordinate Definition of ER-Gyro-15 (front view)

Specifications

Model	ER-Gyro-15A	ER-Gyro-15B	ER-Gyro-15H
Azimuth accuracy(1σ,°secψ)	1	0.5	1
Gyro tool face angle accuracy(°,1σ)	1/secL (L stands for latitude)		1/secL (L stands for latitude)
Well inclination alignment accuracy(°,1σ)	0.1		0.1
Alignment Time	30 seconds (90 seconds optional)		30 seconds (90 seconds optional)
Azimuth precision retention time	20min		20min
Attitude precision retention time	20min		20min
Azimuth measurement range(°)	0~360		0~360
Gravity tool face angle measurement range(°)	-180~180		-180~180
Gyro tool face angle measurement range(°)	0~360°		0~360°
Well inclination measurement range(°)	0~180		0~180
Update rate (Hz)	100		100
Power supply and working environment
Operating temperature(℃)	5~+85		5~125
Storage temperature(℃)	0~+90		0~130
Wide voltage(V)	6~12V		6~12V
Power(W)	2		3
Communication interface	RS-422		RS-422
Appearance characteristics
Size(mm×mm)	120mm x Φ30mm （120mm x 25.4mm customizable）
Weight(g)	≤150g

Wiring Definition

Connect Type	Pin	Definition
J30J-15ZKP	1	+6~12V
	3	GND
	6	Tx+
	7	Tx-
	8	Rx+
	9	Rx-
	10	GND

Dimension

Communication protocol

Data output protocol

Byte	Content	Note	Data type
1	EB	Protocol header	Unsigned char
2	80	Protocol header	Unsigned char
3	55	Protocol header	Unsigned char
4	AA	Protocol header	Unsigned char
5~8	Sensor Data	X Gyroscope, deg/s	float
9~12	Sensor Data	Y Gyroscope, deg/s	float
13~16	Sensor Data	Z Gyroscope, deg/s	float
17~20	Sensor Data	X Accelerometer, m/s^2	float
21~24	Sensor Data	Y Accelerometer, m/s^2	float
25~28	Sensor Data	Z Accelerometer, m/s^2	float
29	System State	0 alignment 1 navigation	Unsigned char
30~33	System Results	Azimuth	float
34~37	System Results	Inclination	float
38~41	System Results	tf_gravity	float
42~45	System Results	tf_gyro	float
46~49	System Results	Temperature	float
50	Counter	Frame count	Unsigned char
51	Checksums	1~50 Bytes sum	Unsigned char

Data input protocol

Byte	Content	Note	Data type
1	AA	Protocol header	Unsigned char
2	15	Protocol header	Unsigned char
3	AA	Protocol header	Unsigned char
4	15	Protocol header	Unsigned char
5~8	Lon	Degree	float
9~12	Lat	Degree	float
13~16	Alt	Meter	float
17~20	G0	Gravitational acceleration	float
21~22	Time	Alignment Time	short
23	AA	Protocol End	Unsigned char
24	BB	Protocol End	Unsigned char
25	CC	Protocol End	Unsigned char
26	DD	Protocol End	Unsigned char