Formation of shock pulses in drilling tool during double collision between bodies with allowance for interaction between tool and rock

A technical solution is proposed for the elimination the grabbing of drilling tool, based on the use of energy due to the circulation of the drilling fluid. The expediency eliminating the grabbing drilling tool using the hydro-impulse method is substantiated. A method of drawing up a mathematical model for the dynamic process of a grabbing string of drill pipes in the case of perturbation of hydro-impulse oscillations in the area of the productive rock layer is developed. The law of longitudinal displacements arising in the trapped string is obtained, which allows choosing the optimal geometrical parameters of the passage channels and the frequency rotational of shutter for these channels. Recommendations for using this method for practical use have been systematized.

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ANALYSIS OF STAND RESEARCH RESULTS OF AXIAL DYNAMIC FORCE IN DRILLING BY THREE ROLLER CONE BIT

PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY Number ◽

10.31471/2304-7399-2019-1(53)-81-93 ◽

2019 ◽

pp. 81-93

Author(s):

В. М. Мойсишин ◽

M. V. Lyskanych ◽

R. A. Zhovniruk ◽

Ye. P. Majkovych

Keyword(s):

Low Frequency ◽

Maximum Energy ◽

Dynamic Force ◽

Low Frequency Oscillation ◽

Drilling Tool ◽

Rock Destruction ◽

Frequency Components ◽

Harmonic Components ◽

Experimental Values ◽

Harmful Effects

The purpose of the proposed article is to establish the causes of oscillations of drilling tool and the basic laws of the distribution of the total energy of the process of changing the axial dynamic force over frequencies of spectrum. Variable factors during experiments on the classical plan were the rigidity of drilling tool and the hardness of the rock. According to the results of research, the main power of the process of change of axial dynamic force during drilling of three roller cone bits is in the frequency range 0-32 Hz in which three harmonic frequency components are allocated which correspond to the theoretical values of low-frequency and gear oscillations of the chisel and proper oscillations of the bit. The experimental values of frequencies of harmonic components of energy and normalized spectrum as well as the magnitude of the dispersion of the axial dynamic force and its normalized values at these frequencies are presented. It has been found that with decreasing rigidity of the drilling tool maximum energy of axial dynamic force moves from the low-frequency oscillation region to the tooth oscillation area, intensifying the process of rock destruction and, at the same time, protecting the tool from the harmful effects of the vibrations of the bit. Reducing the rigidity of the drilling tool protects the bit from the harmful effects of the vibrations generated by the stand. The energy reductions in these fluctuations range from 47 to 77%.

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Kinematics and dynamics analysis of new rotary-percussive PDM drilling tool

Journal of Low Frequency Noise Vibration and Active Control ◽

10.1177/1461348421989156 ◽

2021 ◽

pp. 146134842198915

Author(s):

Jialin Tian ◽

Xuehua Hu ◽

Liming Dai ◽

Lin Yang ◽

Yi Yang ◽

...

Keyword(s):

Drill String ◽

Structure Design ◽

Drilling Process ◽

Analysis Model ◽

Drilling Tool ◽

Stick Slip ◽

Rate Of Penetration ◽

Bottom Hole ◽

Bottom Hole Assembly ◽

The Impact

This paper presents a new drilling tool with multidirectional and controllable vibrations for enhancing the drilling rate of penetration and reducing the wellbore friction in complex well structure. Based on the structure design, the working mechanism is analyzed in downhole conditions. Then, combined with the impact theory and the drilling process, the theoretical models including the various impact forces are established. Also, to study the downhole performance, the bottom hole assembly dynamics characteristics in new condition are discussed. Moreover, to study the influence of key parameters on the impact force, the parabolic effect of the tool and the rebound of the drill string were considered, and the kinematics and mechanical properties of the new tool under working conditions were calculated. For the importance of the roller as a vibration generator, the displacement trajectory of the roller under different rotating speed and weight on bit was compared and analyzed. The reliable and accuracy of the theoretical model were verified by comparing the calculation results and experimental test results. The results show that the new design can produce a continuous and stable periodic impact. By adjusting the design parameter matching to the working condition, the bottom hole assembly with the new tool can improve the rate of penetration and reduce the wellbore friction or drilling stick-slip with benign vibration. The analysis model can also be used for a similar method or design just by changing the relative parameters. The research and results can provide references for enhancing drilling efficiency and safe production.

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Apparatus, system and method for a reinforced seal element for joints on a drilling tool

Sealing Technology ◽

10.1016/s1350-4789(20)30295-6 ◽

2020 ◽

Vol 2020 (9) ◽

pp. 11

Keyword(s):

Drilling Tool

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A novel thread connection structure of slimehole drilling tool in ultra-deep natural gas well

Science Progress ◽

10.1177/00368504211026414 ◽

2021 ◽

Vol 104 (2) ◽

pp. 003685042110264

Author(s):

Zhang Ying ◽

Lian Zhanghua ◽

Gao Anqi ◽

Yang Kun

Keyword(s):

Fatigue Life ◽

Stress Concentration ◽

Stress Concentration Factor ◽

Concentration Factor ◽

Sensitivity Coefficient ◽

Notch Sensitivity ◽

Sensitivity Factor ◽

Drilling Tool ◽

Gas Well ◽

Thread Connection

The thread connection’s root fillet radius of 0.038″ size is the greatest weakness of the API NC type joints and thread. During the slimehole drilling, especially in the deep and ultra-deep gas well, its stress concentration factor and notch sensitivity factor are very high A novel thread connection design (TM) of a drilling tool is proposed to decrease the fatigue failure of the slimehole drilling tool in the deep and the ultra-deep gas well in the Tarim oilfield China. The novelty in the TM thread structure is, reducing the threads per inch, extending the distance from the last engaged thread to the external shoulder of the pin and adding three threads to the conventional connection. The novel thread connection will improve the slimehole drilling tool’s anti-fatigue life due to its improved elasticity and rigidity. Furthermore, the TM can transfer the maximum stress at the connection root to the loaded surface, which can effectively lower the fatigue notch’s sensitivity coefficient. In this paper, the finite element method (FEM) is applied to carry out the detailed comparative analysis of the TM with existing thread connection NC38, TX60 and TH90. The TM has the lowest stress concentration factor and fatigue notch sensitivity coefficient, so its anti-fatigue life is the highest. In addition, TM is manufactured and is tested at Tarim oilfield in China.

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Design of a New Acoustic Logging While Drilling Tool

Sensors ◽

10.3390/s21134385 ◽

2021 ◽

Vol 21 (13) ◽

pp. 4385

Author(s):

Kai Zhang ◽

Baohai Tan ◽

Wenxiu Zhang ◽

Yuntao Sun ◽

Jian Zheng ◽

...

Keyword(s):

Impedance Matching ◽

Sine Wave ◽

Azimuthal Anisotropy ◽

Dipole Source ◽

Pulse Excitation ◽

Drilling Tool ◽

Overall Design ◽

Logging While Drilling ◽

Physical Construction ◽

Exciting Wave

To obtain qualified logging while drilling (LWD) data, a new acoustic LWD tool was designed. Its overall design is introduced here, including the physical construction, electronic structure, and operation flowchart. Thereafter, core technologies adopted in this tool are presented, such as dominant exciting wave bands of dipole source, a sine wave pulse excitation circuit, broadband impedance matching, and an intellectualized active reception transducer. Lastly, we tested this tool in the azimuthal anisotropy module well, calibration well, and normal well, working in the model of the cable, sliding eye, and logging while drilling. Experiments showed that the core technologies achieved ideal results and that the LWD tool obtained qualified data.

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Shock Pulse Shaping in a Small-Form Factor Velocity Amplifier

Shock and Vibration ◽

10.1155/2010/478323 ◽

2010 ◽

Vol 17 (6) ◽

pp. 787-802 ◽

Cited By ~ 5

Author(s):

Gerard Kelly ◽

Jeff Punch ◽

Suresh Goyal ◽

Michael Sheehy

Keyword(s):

Pulse Shaping ◽

Vertical Axis ◽

Mechanical Shock ◽

Practical Applications ◽

Shock Testing ◽

Acceleration Signal ◽

High Acceleration ◽

Component Assembly ◽

Small Form Factor ◽

Shock Pulses

This theme of this paper is the design and characterisation of a velocity amplifier (VAMP) machine for high-acceleration shock testing of micro-scale devices. The VAMP applies multiple sequential impacts to amplify velocity through a system of three progressively smaller masses constrained to move in the vertical axis. Repeatable, controlled, mechanical shock pulses are created through the metal-on-metal impact between pulse shaping test rods, which form part of the penultimate and ultimate masses. The objectives are to investigate the controllable parameters that affect the shock pulses induced on collision, namely; striker and incident test rod material; test rod length; pulse shaping mechanisms; and impact velocity. The optimum VAMP configuration was established as a 60 mm long titanium striker test rod and a 120 mm long titanium incident rod. This configuration exhibited an acceleration magnitude and a primary pulse duration range of 5,800–23,400 g and 28.0–44.0μs respectively. It was illustrated that the acceleration spectral content can be manipulated through control of the test rod material and length. This is critical in the context of practical applications, where it is postulated that the acceleration signal can be controlled to effectively excite specific components in a multi-component assembly affixed to the VAMP incident test rod.

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