Drill string instability reduction by optimum positioning of stabilizers

Mahyari, Mohammad Faraji; Behzad, Mahdi; Rashed, Gholamreza

doi:10.1243/09544062jmes1566

Cited by 11 publications

(4 citation statements)

References 30 publications

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“…Formulae (9), (13), and (14) can be simplified to the simulation model established in [18,19] (hereinafter referred to as model 3) without considering the geometric stiffness excitation caused by the axial stress and the borehole trajectory excitation caused by the axial motion of SRS:…”

Section: (10)mentioning

confidence: 99%

“…It can be simplified as a mechanical problem of bending deformation of slender rod string in borehole. At present, there are many researches on the dynamic behavior of drill string [7][8][9][10][11][12][13][14][15]. Based on different methods and considering different excitation, different transverse vibration simulation models of drill string were established.…”

Section: Introductionmentioning

confidence: 99%

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Spatial Transverse Vibration Simulation Model of Axially Moving Sucker Rod String under the Excitation of Curved Borehole

Wang

Dong

2020

Shock and Vibration

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The mechanical model of transverse vibration of sucker rod string (SRS) in directional well is simplified to the transverse vibration model of longitudinal and transverse curved beam with initial bending under borehole constraints. In this paper, besides considering the excitation of alternating axial load on the transverse vibration of SRS, it is proposed for the first time that curved borehole is also the main excitation for the transverse vibration when the SRS moves reciprocating axially in the borehole. Based on the elastic body vibration theory, the transverse vibration mathematical model of SRS with initial bending under borehole constraints is established. In this model, the curved borehole excitation caused by the axial motion and the alternating axial load excitation is considered. Besides, the elastic collision theory is applied to describe the constraint of tube on the SRS transverse vibration in this model. Then the fourth-order Runge–Kutta method is used to calculate the transverse vibration of SRS in directional wells. The simulation results show the following: (1) The simulation results of the three simulation models in this paper are different. The results indicate that the curved borehole excitation caused by the axial motion and the alternating axial load excitation is the main excitation for the SRS transverse vibration. (2) In directional wells, the rod and tube contact along the well depth, and the dangerous sections locate at the deviation section of the borehole and the compression section of the rod. On the whole, the contact force between rod and tube in deviation section of borehole is larger. The transverse vibration of the compression section of the rod is the most violent.

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Section: (10)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial Transverse Vibration Simulation Model of Axially Moving Sucker Rod String under the Excitation of Curved Borehole

Wang

Dong

2020

Shock and Vibration

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“…In the meanwhile, measurement while drilling is used to optimize the drilling parameters to reduce stick slip. 12 Based on the real-time measurement, many other approaches for stick-slip suppression developed, such as bottom-hole assembly (BHA) optimization, 13,14 bit redesign and bit selection, 15,16 and use of active control systems. 17,18 At the beginning of development of real-time measurement, only the surface data can be collected.…”

Section: Introductionmentioning

confidence: 99%

On the development of high-frequency torsional impact drilling techniques for hard formation drilling

Tang

Zhu

2018

Advances in Mechanical Engineering

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Stick-slip vibration is a big problem that the drilling of deep wells has to face, especially for drilling of tough formations. This type of vibration leads to failure problems, reduces the rate of penetration, and lowers the borehole quality. Suppression techniques for stick-slip vibration, for example, active control method based on real-time measurement, play important roles in improving the drilling efficiency. The high-frequency torsional impact drilling, however, provides a cheaper and more stable way to mitigate stick-slip in many conditions. This work is aimed to study the high-frequency torsional impact generator, which is used to achieve the function, for this new technique. First, state-of-the-art of highfrequency torsional impact generator is studied by schematically illustrating the existing four structures and their operating principles, followed by comments for these structures. Second, theoretical background of the high-frequency torsional impact drilling is presented, showing how the high-frequency torsional impact generator works to mitigate stickslip and improve drilling efficiency. Finally, an optimally designed high-frequency torsional impact generator is schematically described. It is an improved version of the assembly of United Diamond and the improvements are based on results of a series of laboratory experiments.

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“…Particularly, when drilling a directional well, many sections are drilled with different types of bottom-hole assembly (BHA), packed BHA and pendulum BHA for example (Akgun, 2004;Bailey & Remmert, 2010;Panayirci et al, 2015). In order to develop different types of BHA so that the deflection angle of the wellbore can be controlled and a part of the vibration can be reduced, stabilizers which are usually undersized in comparison to the drill bit are used (Mahyari et al, 2010;Richard et al, 2016;Yigit & Christoforou, 2006). For different types of BHA, the location and number of stabilizers vary.…”

Section: Introductionmentioning

confidence: 99%

Development of an adjustable stabilizer for controlling the borehole trajectory

Tang

Zhu

2018

JAMDSM

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During the drilling process, many types of bottom-hole assembly are used to adjust the well inclination and azimuth. For the drilling of inclined wells or horizontal wells, it has to face problems of repeated round trips so as to control the borehole trajectory. Such problems lead to the increase in non-productive time and the drilling cost. In order to address this issue, the idea of generating different types of bottom-hole assembly without round trips of drill-string was formed. In this paper, an adjustable stabilizer has been developed to avoid repeated round trips of the drill-string. Firstly, the mechanism of adjustable stabilizer controlling the borehole trajectory is presented. Secondly, the structure and operating principle of the adjustable stabilizer are described. Thirdly, numerical verifications of the key components of the adjustable stabilizer are conducted. Finally, laboratory tests and field tests are carried out to examine the design. Results of the numerical simulations and the laboratory and field tests show that the adjustable stabilizer operates normally and three phases of the radial pistons can be reached through regulating the flow of the drilling fluid. In addition, the pressure differences for starting the phases are measured.

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Drill string instability reduction by optimum positioning of stabilizers

Cited by 11 publications

References 30 publications

Spatial Transverse Vibration Simulation Model of Axially Moving Sucker Rod String under the Excitation of Curved Borehole

Spatial Transverse Vibration Simulation Model of Axially Moving Sucker Rod String under the Excitation of Curved Borehole

On the development of high-frequency torsional impact drilling techniques for hard formation drilling

Development of an adjustable stabilizer for controlling the borehole trajectory

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