{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,16]],"date-time":"2026-06-16T11:24:52Z","timestamp":1781609092235,"version":"3.54.5"},"reference-count":44,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2015,12,9]],"date-time":"2015-12-09T00:00:00Z","timestamp":1449619200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Micromachines"],"abstract":"<jats:p>In the recent years horizontal drilling (HD) has become increasingly important in oil and gas exploration because it can increase the production per well and can effectively rework old and marginal vertical wells. The key element of successful HD is accurate navigation of the drill bit with advanced measurement-while-drilling (MWD) tools. The size of the MWD tools is not significantly restricted in vertical wells because there is enough space for their installation in traditional well drilling, but the diameter of devices for HD must be restricted to less than 30 mm for some applications, such as lateral drilling from existing horizontal wells. Therefore, it is essential to design miniature devices for lateral HD applications. Additionally, magnetometers in traditional MWD devices are easily susceptible to complex downhole interferences, and gyroscopes have been previously suggested as the best avenue to replace magnetometers for azimuth measurements. The aim of this paper is to propose a miniature gyroscope-based MWD system which is referred to as miniature gyroscope-based while drilling (MGWD) system. A prototype of such MGWD system is proposed. The device consists of a two-axis gyroscope and a three-axis accelerometer. Miniaturization design approaches for MGWD are proposed. In addition, MGWD data collection software is designed to provide real-time data display and navigation algorithm verification. A fourth-order autoregressive (AR) model is introduced for stochastic noise modeling of the gyroscope and the accelerometer data. Zero velocity and position are injected into a Kalman filter as a system reference to update system states, which can effectively improve the state observability of the MGWD system and decrease estimation errors. Nevertheless, the azimuth of the proposed MGWD system is not observable in the Kalman filter, and reliable azimuth estimation remains a problem.<\/jats:p>","DOI":"10.3390\/mi6121467","type":"journal-article","created":{"date-parts":[[2015,12,9]],"date-time":"2015-12-09T15:21:41Z","timestamp":1449674501000},"page":"1946-1970","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Design and Algorithm Verification of a Gyroscope-Based Inertial Navigation System for Small-Diameter Spaces in Multilateral Horizontal Drilling Applications"],"prefix":"10.3390","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2206-9490","authenticated-orcid":false,"given":"Tao","family":"Li","sequence":"first","affiliation":[{"name":"Marine Navigation Research Institute, College of Automation, Harbin Engineering University, No. 145 Nan Tong Street, Harbin 150001, China"},{"name":"Low Frequency Instrumentation Laboratory, Department of Electrical and Computer Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gannan","family":"Yuan","sequence":"additional","affiliation":[{"name":"Marine Navigation Research Institute, College of Automation, Harbin Engineering University, No. 145 Nan Tong Street, Harbin 150001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haiyu","family":"Lan","sequence":"additional","affiliation":[{"name":"Marine Navigation Research Institute, College of Automation, Harbin Engineering University, No. 145 Nan Tong Street, Harbin 150001, China"},{"name":"Department of Geomatics Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Mintchev","sequence":"additional","affiliation":[{"name":"Low Frequency Instrumentation Laboratory, Department of Electrical and Computer Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2015,12,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1997","DOI":"10.1109\/TIM.2005.853562","article-title":"Fog-based navigation in downhole environment during horizontal drilling utilizing a complete inertial measurement unit: Directional measurement-while-drilling surveying","volume":"54","author":"Ledroz","year":"2005","journal-title":"IEEE Trans. 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