Mems Gyro Tools Directional Module To Replace Fluxgate

MEMS Gyroscopic Directional Module for Gyro Tools (Direct Replacement for Fluxgate Module)

ER-Gyro-19
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

MEMS Gyroscopic Directional Module for Gyro Tools (Direct Replacement for Fluxgate Module)

Introduction

The ER-Gyro-19 is a revolutionary MEMS-based gyro directional module designed for direct, drop-in replacement of standard fluxgate modules. With fully compatible electrical interfaces and mechanical dimensions, it integrates seamlessly into existing probe and logging tool architectures—eliminating hardware redesign costs.

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:Dimension 8mm x 20.3mm x 19mm. Replaces fluxgate sensors in situ with no system modifications, offering an immediate and cost-effective path to non-magnetic measurement capability.

Applications

Oil & Gas Drilling & Logging:for Measurement-While-Drilling (MWD)/Logging-While-Drilling (LWD) in cased holes, side-tracks, and wells with significant magnetic interference from drill strings, casings, or geological formations.
Cased-Hole Logging & Well Intervention:for gyroscopic surveys in production wells and for providing precise directional data for well abandonment, sidetracking, and re-entry operations where magnetic tools are unusable.
Pipeline & Utility Installation (HDD):for the accurate mapping of pipeline routes, especially in congested urban areas with existing underground utilities that create magnetic noise.

191

Figure 1. X,Y,Z Coordinate Definition of the ER-Gyro-19 (top view)

Performance parameters

Model	ER-Gyro-19A	ER-Gyro-19B	ER-Gyro-19H
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)	136.8mm x 20.3mm x 19mm
Weight (g)	≤150g

Wiring Definition

Connector Model	Pinout	Definition
J30J-15ZKP	1	+6~12V
	3	GND
	6	Tx+
	7	Tx-
	8	Rx+
	9	Rx-
	10	GND

Dimension

192

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