Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout
Abstract
:1. Introduction
2. The Composition and Operation Characteristics of the Downhole Drill String
2.1. Composition of the Bottom Drill String
2.2. Causes of Drill String Eccentricity
2.3. Operational Characteristics of the Drill String
2.4. Influence of Eccentric Factors on Measurement
3. Borehole Eccentricity Multi-Sensor Measurement Principle and Measurement Method
3.1. Composition of Sensors for Measuring Drill String Eccentricity
3.2. Acquisition of Multi-Directional Diameter and Drill Collar Attitude
3.2.1. Obtain Borehole Inclination, Azimuth, and Tool Face
3.2.2. Calipers Sensor
3.3. Methods and Equations for Determining the Eccentricity of Two Groups of Sensors
3.4. Representation of Eccentricity Matrix at a Measuring Point Along the Drill Collar
4. Simulation Analysis and Field Test of Drill String Eccentricity State
4.1. Analysis of Eccentricity Characteristics in Case of No Bending of Drill String and Zero Included Angle
4.1.1. Center Rotation
4.1.2. Eccentric Rotation
4.2. Analysis of Eccentricity Characteristics in the Case of No Bending of Drill String and Included Angle Greater Than Zero
4.2.1. Tilting Rotation
4.2.2. Tilting Rotation 60 RPM and Revolution
4.3. Analysis of Eccentric Characteristics of the Drill String with Bending
4.3.1. Buckling Rotation without Revolution
4.3.2. There Is Revolution in Buckling
4.4. Analysis and Discussion of Drill String Eccentricity Characteristics
4.5. Field Test
5. Discussion and Conclusions
5.1. Discussion
5.2. Conclusions
- (1)
- The multi-sensor layout scheme proposed in this paper can separate the rotation and revolution velocities of drill collars in the wellbore and analyze the eccentric characteristics of drill collars in the wellbore.
- (2)
- The inclination, parallel eccentricity, buckling, and revolution of the drill string are all related to the distance between the measuring point and the borehole wall.
- (3)
- Under the conditions of a relatively regular wellbore and a relatively regular downhole movement of drill collars, the matrix of distance between each measuring tool face and wellbore wall distributed along the axis of drill collars at each measurement point was obtained.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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No. | Bit Size (mm) | Downhole Motor (DM) Type (mm) | Downhole Motor (DM) Angle (°) | Drill Collar of the Instrument While Drilling (DCWD)(mm) | DCWD Length (m) | Magnification of the Hole (MH), | Range of Distance from the Sensor to the Wellbore Wall (RDSW) (mm) | Buckling |
---|---|---|---|---|---|---|---|---|
1 | ϕ149.2 | ϕ120 | 1,1.25,1.5,1.75 | ϕ120 | 10~30 | 0.05~0.15 | 0~29.2 ± 15 | Easy |
2 | ϕ152.4 | ϕ120 | 1,1.25,1.5,1.75 | ϕ120 | 10~30 | 0.05~0.15 | 0~32.4 ± 15 | Easy |
3 | ϕ215.9 | ϕ172 | 1,1.25,1.5,1.75 | ϕ172 | 10~30 | 0.05~0.15 | 0~43.9 ± 20 | Medium |
4 | ϕ241.3 | ϕ203.2 | 1,1.25,1.5,1.75 | ϕ203.2 | 10~30 | 0.05~0.15 | 0~38.1 ± 24 | Difficult |
5 | ϕ311.1 | ϕ203.2 | 1,1.25,1.5,1.75 | ϕ203.2 | 10~30 | 0.05~0.15 | 107.9 ± 31 | Difficult |
6 | ϕ346.1 | ϕ203.2 | 1,1.25,1.5,1.75 | ϕ203.2 | 10~30 | 0.05~0.15 | 142.9 ± 34 | Difficult |
No. | Drill String Eccentric Type | Whether to Rotate Around Itself (30 r/m~75 r/m) | Additional Rotation Around the WellBore |
---|---|---|---|
1 | Centering | Yes | Yes/No |
2 | Eccentricity | Yes | Yes/No |
3 | Tilt | Yes | Yes/No |
4 | Buckling | Yes | Yes/No |
No. | Center | Center and Revolution | Eccentric Tool Face (Tf) | Eccentric = and Revolution | Tilt | Tilt and Revolution | Buckling | Buckling and Revolution | |
---|---|---|---|---|---|---|---|---|---|
1 | Max distance | Same | Same | Specific Tf | Change | Both ends of DC | Both ends of DC | Central DC | Central DC |
2 | Min distance | Same | Same | Specific Tf | Change | Both ends of DC | Both ends of DC | Central DC | Central DC |
3 | Med distance | Same | Same | Specific Tf | Change | Central DC | Central DC | Both ends of DC | Both ends of DC |
4 | Drill collar length correlation | No | No | No | NO | Yes | Yes | Yes | Yes |
5 | Change over time | No | No | No | Yes | No | Yes | No | Yes |
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Li, H.; Wang, R. Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout. Sensors 2021, 21, 1258. https://doi.org/10.3390/s21041258
Li H, Wang R. Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout. Sensors. 2021; 21(4):1258. https://doi.org/10.3390/s21041258
Chicago/Turabian StyleLi, Hongqiang, and Ruihe Wang. 2021. "Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout" Sensors 21, no. 4: 1258. https://doi.org/10.3390/s21041258
APA StyleLi, H., & Wang, R. (2021). Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout. Sensors, 21(4), 1258. https://doi.org/10.3390/s21041258