Longitudinal and transverse vibrations of the frame and the machine section of a rotary drilling rig

1990 ◽  
Vol 26 (5) ◽  
pp. 443-450
Author(s):  
L. Sh. Gavasheli
Keyword(s):  
Rotary Drilling ◽  
Drilling Rig ◽  
Transverse Vibrations ◽  
Machine Section

Study and Test of Coupled Axial and Transverse Vibrations on Drillpipe for Rotary Drilling Rig

2014 ◽  
Vol 472 ◽  
pp. 73-78
Author(s):  
Xin Xin Xu ◽  
Sheng Jie Jiao ◽  
Jian Lian Cheng ◽  
Jin Ping Li
Keyword(s):  
Maximum Amplitude ◽  
Axial Displacement ◽  
Variation Principle ◽  
Transverse Displacement ◽  
Test Results ◽  
Rotary Drilling ◽  
Drilling Rig ◽  
Transverse Vibrations ◽  
Vibration Responses ◽  
Vibration Mechanism

In order to more accurately predict the vibration characteristics of drillpipe for rotary drilling rig, dynamic model of coupled axial and transverse vibrations was established based on Hamilton variation principle and finite element theory after discussing the vibration mechanism of drillpipe. The Newmark-β method was adopted to solve the dynamic equation and the simulated vibration responses of drillpipe were calculated. The results show that the axial models yield harmonic motion. The axial displacement is quite small and the maximum amplitude of the first section is about 6×10-4 m. The transverse displacement is much larger than the axial displacement and the maximum transverse amplitude of the first section is about 0.03 m. The drillpipe of the first section of rotary drilling rig was tested. Comparing simulation results and test results, trends of the responses of axial displacement and transverse displacement have a good agreement and the simulation model is verified by the experiment.

Drilling Cutting Analysis to Assist Drilling Performance Evaluation in Hard Rock Hole Widening Operation

2020 ◽  
Author(s):  
Daiyan Ahmed ◽  
Yingjian Xiao ◽  
Jeronimo de Moura ◽  
Stephen D. Butt
Keyword(s):  
Performance Enhancement ◽  
Ore Deposits ◽  
Drilling Process ◽  
Rotary Drilling ◽  
Pilot Hole ◽  
Drilling Rig ◽  
Drilling Performance ◽  
Drilling Parameters ◽  
Weight On Bit ◽  
Drilling Operations

Abstract Optimum production from vein-type deposits requires the Narrow Vein Mining (NVM) process where excavation is accomplished by drilling larger diameter holes. To drill into the veins to successfully extract the ore deposits, a conventional rotary drilling rig is mounted on the ground. These operations are generally conducted by drilling a pilot hole in a narrow vein followed by a hole widening operation. Initially, a pilot hole is drilled for exploration purposes, to guide the larger diameter hole and to control the trajectory, and the next step in the excavation is progressed by hole widening operation. Drilling cutting properties, such as particle size distribution, volume, and shape may expose a significant drilling problem or may provide justification for performance enhancement decisions. In this study, a laboratory hole widening drilling process performance was evaluated by drilling cutting analysis. Drill-off Tests (DOT) were conducted in the Drilling Technology Laboratory (DTL) by dint of a Small Drilling Simulator (SDS) to generate the drilling parameters and to collect the cuttings. Different drilling operations were assessed based on Rate of Penetration (ROP), Weight on Bit (WOB), Rotation per Minute (RPM), Mechanical Specific Energy (MSE) and Drilling Efficiency (DE). A conducive schedule for achieving the objectives was developed, in addition to cuttings for further interpretation. A comprehensive study for the hole widening operation was conducted by involving intensive drilling cutting analysis, drilling parameters, and drilling performance leading to recommendations for full-scale drilling operations.

Properties of Drillstring Vibration Absorber for Rotary Drilling Rig

2020 ◽  
Vol 45 (7) ◽  
pp. 5849-5858
Author(s):  
Xinxin Xu ◽  
Hairong Gu ◽  
Zhitao Kan ◽  
Youzhen Zhang ◽  
Jianlian Cheng ◽  
...  
Keyword(s):  
Vibration Absorber ◽  
Rotary Drilling ◽  
Drilling Rig

Investigation of Drillstring Transverse Vibrations at Rotary Drilling of Inclined Wells

2002 ◽  
Author(s):  
Vadim S. Tikhonov ◽  
Alexander I. Safronov ◽  
Michael Ya. Gelfgat
Keyword(s):  
Horizontal Wells ◽  
Nonlinear Mathematical Model ◽  
Rotary Drilling ◽  
Motion Equations ◽  
Compression Load ◽  
Lateral Vibrations ◽  
Transverse Vibrations ◽  
Drilling Parameters ◽  
Drill Pipes ◽  
Rotary Speed

Significant part of axial compression load transferred to the bit while drilling of wells with high zenith angles is resisted by service drill pipes. By the action of static critical load, buckling of drillstring occurs initially in the shape of a sinusoid and subsequently, as the load increases, in the shape of a helix. Drillstring rotation promotes the occurrence of critical modes. As a result the drillstring can start snaking motion at the low side of the hole. When the rotary speed grows, whirling of the drillstring can occur with axial load much lower than the buckling load. In this paper, a nonlinear mathematical model of lateral vibrations of a rotating drillstring in straitened space of a straight inclined hole is proposed. A numerical method to solve drillstring motion equations has been developed that allowed to reduce time of computation. This made it possible to conduct a detailed study of how the main drilling parameters (compression load, drillstring rotary speed, hole angle, friction factor, etc.) effect drillstring motion in the well. Results of the study may be used to choose drillstring operation modes for rotary drilling of inclined and horizontal wells.

scholarly journals Research on Formation Identification Based on Drilling Shock and Vibration Parameters and Energy Principle

2021 ◽  
Vol 2021 ◽  
pp. 1-22
Author(s):  
Yu Ding ◽  
Zhuoying Tan ◽  
Shuguang Li ◽  
Zizhen Miao ◽  
Huifen Qu
Keyword(s):  
Prediction Accuracy ◽  
Rotation Speed ◽  
Fluid Pressure ◽  
Drilling Process ◽  
Drilling Rate ◽  
Prediction Formula ◽  
Axial Pressure ◽  
Rotary Drilling ◽  
Research Results ◽  
Drilling Rig

In geotechnical engineering and geological survey, the stratum structure and its corresponding physical and mechanical properties are the most concerned. The stratum structure not only affects the safety of the project but also plays a decisive role in the construction method and construction sequence. In this paper, a new type of stratum geological interface recognition system is adopted, and an R-20 rotary drilling rig is used to conduct on-site drilling experiments for a granite site with no ventilation. The research results show that the system can monitor and record the main parameters (axial pressure, drilling rate, rotation speed, flushing fluid pressure, and torque) of the drilling rig during the drilling process. The comparative analysis of monitoring data and on-site survey results shows that different drilling parameters have different sensitivities to changes in the formation structure. According to the prediction accuracy, the ranking from high to low is drilling rate, axial pressure, torque, rotation speed, and flushing fluid pressure. In drilling engineering, by observing the change law of drilling rig parameters, not only can the position of the special rock mass interlayer be predicted, but also the stratum structure and strength can be identified, and the prediction formula is also given. Based on the established drilling specific energy formula, the energy analysis method is used to predict the formation structure and compressive strength, and the corresponding prediction formula is given. The research results show that, compared with the single drilling parameter prediction method, the rock-soil structure and strength identification method based on energy theory has higher prediction accuracy and can meet engineering needs.

Study of the Relationship Between Oriented Downhole Dynamic Weight on Bit and Drilling Parameters in Coring Isotropic Natural and Synthetic Rocks

2019 ◽  
Author(s):  
Abdelsalam N. Abugharara ◽  
John Molgaard ◽  
Charles A. Hurich ◽  
Stephen D. Butt
Keyword(s):  
Water Flow Rate ◽  
Sampling Rate ◽  
Depth Of Cut ◽  
Rotary Drilling ◽  
Drilling Rig ◽  
Isotropic Rock ◽  
Dynamic Weight ◽  
Drilling Parameters ◽  
Weight On Bit ◽  
Rock Characterization

Abstract Coring natural rocks (granite) and synthetic rocks (rock like material, RLM) using diamond impregnated coring bit was performed by A rigid coring system. RLM and granite were previously tested to be isotropic rocks by the author [1, 2, 3, 4] A baseline procedure was developed for isotropic rock characterization [2] and this work is to contribute to the developed baseline procedure by considering downhole dynamic weight on bit (DDWOB). The drilling parameters involved in the analysis included rate of penetration (ROP) depth of cut (DOC), rpm, and torque. All parameters were studied as a function of DDWOB at 300 and 600 input rpm. A fully instrumented laboratory scale rotary drilling rig was used with 5 liter/minute water flow rate. Samples were first cored in 47.6 mm diameter in the desired orientations. Samples of granite were cored in two perpendicular directions (vertical and horizontal) and samples of RLM were cored in three directions including vertical, oblique, and horizontal. The coring experiments were performed using 25.4 mm diamond impregnated coring bit. At each input rpm and at each applied static weight, multiple coring runs were repeated and then averaged; therefore, each point of the displayed data was averaged of at least three repeated experiments at the same inputs. DDWOB was recorded by a load cell fixed beneath the sample holder and connected to a Data Acquisition System that records at 1000 HZ sampling rate. Several sensors were used to record the required data, including operational rotary speed, advancement of drill bit for ROP calculation, and motor current for torque measurement. Results showed similar trends in different orientations at the same inputs demonstrating RLM and granite isotropy. The results also showed the influence of DDWOB on ROP, DOC, rpm, and torque (TRQ) expanding the baseline procedure through considering DDWOB for isotropic rock characterization.

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