Investigation of the Factors that Influence EM-MWD Signal Transmission in Drill Strings

ZHANG Hao; BI Xueliang; LIU Weikai; XU Yueqing; SONG Mingxing; SHAO Shuai

doi:10.11911/syztjs.2021128

Volume 49 Issue 6

Dec. 2021

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Petroleum Drilling Techniques > 2021 > 49(6): 125-130. > DOI: 10.11911/syztjs.2021128

ZHANG Hao, BI Xueliang, LIU Weikai, XU Yueqing, SONG Mingxing, SHAO Shuai. Investigation of the Factors that Influence EM-MWD Signal Transmission in Drill Strings[J]. Petroleum Drilling Techniques, 2021, 49(6): 125-130. DOI: 10.11911/syztjs.2021128

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Investigation of the Factors that Influence EM-MWD Signal Transmission in Drill Strings

1.
School of Petroleum Engineering, Northeast Petroleum University, Daqing, Heilongjiang, 163318, China
2.
Daqing Drilling Engineering Technology Research Institute, Daqing, Heilongjiang, 163413, China
3.
Oil Production Engineering Research Institute, Daqing Oilfield of CNPC, Daqing, Heilongjiang,163453, China

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Received Date: March 29, 2021
Revised Date: August 19, 2021
Available Online: September 14, 2021

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Abstract

Abstract

In electromagnetic measurement while drilling (EM-MWD) systems, drill strings are important channels for EM-MWD signal transmission. For a better understanding of the factors that influence the EM-MWD signal transmission effect in drill strings, the equivalent transmission line method was used to model the EM-MWD signal channel, and the finite element calculation was made using ANSYS software. With the analysis of strata division, research was conducted on the energy loss of signal transmission by drill strings with different specifications in an alternating electromagnetic field and the influence law of casing on EM-MWD signal transmission. Several findings were obtained in this paper. The increase in power and frequency would enhance the energy loss of EM-MWD signal in drill strings, and when the signal frequency exceeded 100 Hz, the loss grew more evidently. The transmission effect varied for different drill strings, but it was better when the ratio of drill string wall thickness to outer diameter was 0.08–0.20. Adding casing on the drill string would shield the transmission of EM-MWD signal and affect the transmission effect. However, when the frequency of downhole EM-MWD signal was below 50 Hz, the impact of casing is small. The research results further clarified the influence of the drill string's own properties on the EM-MWD signal transmission, which can provide a reference for the improvement and design of the EM-MWD system.
- EM-MWD,
- signal transmission,
- drill string,
- influence factor,
- equivalent transmission line method,
- finite element analysis

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Investigation of the Factors that Influence EM-MWD Signal Transmission in Drill Strings

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