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GB/T 46212-2025Petroleum drilling and production equipment — Electromagnetic telemetry measurement while drilling (English PDF)

石油天然气钻采设备电磁波传输随钻测量系统

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 29, 2025

Implementation date

March 1, 2026

Scope

GB/T 46212-2025 is the English-translated version of 石油天然气钻采设备电磁波传输随钻测量系统.

GB/T 46212-2025 is the Chinese national standard covering sending survey data up through the rock instead of up the mud column — the surface antenna, receiver and driller's display, the insulated gap sub that turns the drill string into an antenna, the transmitter and the directional unit that measures inclination, azimuth and tool face, the downhole power supply, the model code that states outside diameter, temperature rating and pressure rating, and the tests and inspection.

First edition, in force from 1 March 2026. Issued on 29 August 2025, it has been in force since 1 March 2026.

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Document preview — GB/T 46212-2025

National Standard of the People's Republic of China

ICS: 75.180.10
Classification: E 92

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

PrefaceIII
1 Scope1
2 Normative References1
3 Terms and Definitions1
4 Composition and Model Designation Method2
5 Technical Requirements2
6 Test Methods8
7 Inspection Rules8
8 Signage and accompanying documents 9.11
9 Packaging, transportation, and storage 10.11
Appendix A (Informative) Schematic diagram of electromagnetic wave transmission measurement-while-drilling system11

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents". Drafting.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Petroleum Drilling Equipment and Tools (SAC/TC96).

This document was drafted by: China Petroleum Engineering Technology Research Institute Co., Ltd., Beijing Petroleum Machinery Co., Ltd., and China Petroleum Group.

Great Wall Drilling Engineering Co., Ltd., China National Petroleum Corporation Oilfield Technical Services Co., Ltd., and China Petroleum & Chemical Corporation Petroleum Engineering Technology Co., Ltd.

Technology Research Institute, Beijing Shigong Intelligent Control Technology Co., Ltd., Dezhou Continental Shelf Petroleum Engineering Technology Co., Ltd., Hangzhou Fenghe Petroleum Technology Co., Ltd. Limited Company.

The main drafters of this document are: Yu Dezhou, Gao Wenkai, Wang Jiajin, Luo Kai, Li Xianyi, Chen Xiaohui, Qin Jinli, Wang Lei, Teng Xinmiao, and Peng Liexin.

Fan Chunying, Pan Xingming, Sun Chengqin, Zhao Cong, Qiao Jianguo, Lu Liqiang, Song Zhaohui, Cao Chong, Chen Wenyi, Wei Zhigang, Fan Jinhui, Xu Lin, Dong Zhiwei Wang Hongli, Wang Guangshuai, Qian Deru, Sun Qi, Hu Yongjian, Zhang Lei.

Electromagnetic wave transmission while drilling for oil and gas drilling equipment Measurement system

1 Scope

This document specifies the composition, model designation method, technical requirements, inspection rules, marking, and accompanying equipment of electromagnetic wave transmission measurement-while-drilling systems.

The document outlines the packaging, transportation, and storage procedures, and describes the corresponding testing methods.

This document applies to the design, manufacture, and inspection of electromagnetic wave transmission measurement-while-drilling systems.

2 Normative references

GB/T 223.3

GB/T 223.72

GB/T 228.1

GB/T 229

GB/T 231.1

GB/T 3452.5

GB/T 3836.1

GB/T 3836.2

GB/T 4336

GB/T 6463

GB 8897.4

GB/T 22512.2

GB/T 35690

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 The system

During drilling, electromagnetic waves are used as signal carriers, and the formation and drill string are used as transmission mediums to transmit real-time acquired and processed data to the surface.

3.2 Surface antenna

A device used to receive electromagnetic wave signals emitted by downhole equipment and convert them into electrical signals.

3.3

An instrument that processes electromagnetic wave signals received from downholes by a ground antenna and acquires downhole data.

3.4 Insulation short section gapsub

It has high resistance characteristics and is a special drill collar used to connect the upper and lower drill strings to form a downhole antenna.

3.5

The component that modulates downhole measurement data into electromagnetic wave signals and outputs them to the downhole antenna.

3.6

A component for real-time measurement of well inclination angle, azimuth angle, and tool face angle parameters.

3.7 4 Composition and Model Designation Method

Components that provide power to downhole equipment.

Note. Includes battery packs and/or power generation units.

4 Composition and Model Designation Method

4.1 Composition

The electromagnetic wave transmission measurement-while-drilling system consists of a surface unit and a downhole unit. The surface unit comprises a surface antenna, a surface receiver, and a driller's display.

The system consists of an indicator, a computer, and related software; a schematic diagram is shown in Figure A.1 of Appendix A. The downhole device comprises an insulating short section, an electromagnetic wave transmitting unit, and a directional...

The system consists of a measurement unit and an underground power supply unit, as shown in Figure A.2.

4.2 Model Designation Method

The model designation method for electromagnetic wave transmission measurement-while-drilling systems is as follows. EM-MWD ----- Electromagnetic wave transmission measurement while drilling system name code The outer diameter of downhole equipment, in millimeters (mm).

Downhole instruments temperature resistance, unit is degrees Celsius (°C). 125, 150, 175 Downhole instrument pressure resistance, unit is megapascal (MPa). 70, 105, 140 Example. EM-MWD121-125-70 indicates an electromagnetic wave transmission measurement while drilling system with an outer diameter of 121mm, a temperature resistance of 125°C, and a pressure resistance of 70MPa.

5 Technical Requirements

5.1 System Performance

5.1.1 Orientation Measurement Unit

The technical specifications of the orientation measurement unit should meet the requirements of Table 1.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.

Referenced standards

Normative references

Editions of GB/T 46212

Edition	Title	Revision	Status
GB/T 46212-2025	Petroleum drilling and production equipment - Electromagnetic telemetry measurement while drilling	current edition	Current

This page sells the current edition, GB/T 46212-2025. Earlier editions are listed for reference only.

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