Consequences and Relevance of Drillstring Vibration on Wellbore Stability

Santos, Hélio; Placido, J.C.R.; Wolter, Claudio

doi:10.2118/52820-ms

Cited by 21 publications

(7 citation statements)

References 7 publications

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“…Currently, numerous methods are available in evaluating crustal stress. The equations below are used for the evaluation of crustal stress in this paper (Gazaniol et al, 1995;Helio Santos et al, 1999;Ge et al, 2001). In this study, the fracturing method is used to calculate horizontal principal stress:…”

Section: Boundary Conditions and Load Parameters Of Current Tectonic mentioning

confidence: 99%

Pre-Spud Mud Loss Flow Rate in Steeply Folded Structures

Wang

Sun

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Pre´diction du de´bit de perte des boues de de´marrage dans des structures fortement plisse´es -Dans cet article, nous proposons une nouvelle me´thode pour pre´dire le de´bit de perte de boues de de´marrage avant forage de formations a`fracturation tectonique dans des structures fortement plisse´es. Cette nouvelle me´thode est base´e sur la stimulation par e´le´ments finis du champ de contraintes pale´o-tectoniques et tectoniques, et de la re´partition de la fracturation. Les e´tapes de la me´thode sont les suivantes. Tout d'abord, la re´partition des contraintes pale´o-tectoniques est simule´e par l'analyse par e´le´ments finis. La re´partition de la fracturation tectonique de la re´gion est obtenue en combinant le crite`re de rupture des roches avec la distribution des contraintes pale´o-tectoniques. Ensuite, les parame`tres de rupture tels que la densite´, l'ouverture, la porosite´et la perme´abilite´des fractures tectoniques sont calcule´s en e´tudiant le processus de reconstruction de contraintes actuelles sur la fracturation tectonique. Enfin, le de´bit de perte des boues de de´marrage est calcule´en fonction des parame`tres de rupture et des donne´es de base pour un puits donne´. La nouvelle me´thode permet de pre´dire le de´bit de perte de boues de de´marrage dans des structures fortement plisse´es.Abstract -Pre-Spud Mud Loss Flow Rate in Steeply Folded Structures -In this paper, a new method that predicts the pre-spud mud loss flow rate in formations with tectonic fractures of steeply folded structures is proposed. The new method is based on finite element analysis of the palaeotectonic and current tectonic stress field and fracture distribution. The steps of the method are as follows. First, palaeo-tectonic stress distribution is simulated through finite element analysis. The tectonic fracture distribution of the region is obtained by combining rock failure criteria with palaeo-tectonic stress distribution. Afterward, the tectonic fracture density, aperture, porosity and permeability are calculated by studying the rebuilding process of current stress to the fracture parameters. Finally, the mud loss flow rate is calculated according to fracture parameters and the basic data of a given well. The new method enables the prediction of the mud loss flow rate before drilling steeply folded structures.

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Section: Boundary Conditions and Load Parameters Of Current Tectonic mentioning

confidence: 99%

Pre-Spud Mud Loss Flow Rate in Steeply Folded Structures

Wang

Sun

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…Ref. [7] concluded in their research that when drilling in hard rocks such as basalt, the drill string acceleration generates lateral load that will impact the wellbore wall and later results into wellbore instability. Ref.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Influence of the Drill String Vibration Cyclic Loads on the Development of the Wellbore Natural Fracture

et al. 2021

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Wellbore instability is one of the most serious issues faced in the drilling process. During drilling operations, the cyclic loads applied on the fractured formation progressively modify the initial parameters (i.e., length and width) of the fractured formation, thus resulting into undesirable wellbore instability. In this paper, using a nonlinear finite element software (ABAQUS) as the numerical simulator, a poro-elasto-plastic model has been established which aimed at analyzing the influence of drill string vibration cyclic loads on the development of the wellbore natural fracture. The numerical results showed that the fracture width as a function of time profiles followed a sinusoidal behavior similar to the drill string vibration cyclic load profiles. For different cyclic load magnitudes with constant number of cyclic loads, the highest percentage increase of the fracture width after integration of cyclic loads was 64.77%. Interestingly, the fracture width increased with the fracture length in the near wellbore region while it globally decreased in the region far away from the wellbore. But for constant cyclic load magnitude with different number of cyclic loads, the biggest percentage increase of the fracture width after integration of cyclic loads was slightly lower representing 63.12% while the oscillating period of the fracture width increased with the number of cyclic loads. The parametric study revealed that the drill string vibration cyclic loads were relatively independent of the fracture length and the bottom hole pressure. However, the fracture width and the loss circulation rates were considerably impacted by the drill string vibration and the highest percentage increase of the loss circulation rate after integration of cyclic loads was 14.3%. This study provides an insight into the coupling of the fracture rock development and the continuous cyclic loads generated by drill string vibrations which is an aspect that has been rarely discussed in the literature.

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“…The engineering factors include the drill pipe rotation, the friction, and collision of drill string vibration, the scouring effect of annular return velocity of drilling fluid, the swab/surge pressure. By establishing drill string vibration models and effective detection method under different working conditions, appropriate drilling tools could be determined and drill string vibration energy could be controlled to effectively reduce borehole enlargement . Some researches have been done on the scouring effect of drilling fluid, which shows that drilling fluid scouring effect depends on the drilling fluid pressure, return velocity, the thickness of mud cake, geological tectonic characteristics, formation rock damage, and so on.…”

Section: Introductionmentioning

confidence: 99%

Large‐scale experiments of the borehole instability on shale formation influenced by drill pipe rotation

Sun

Meng

Dai

et al. 2019

Energy Science & Engineering

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Wellbore instability happens mostly in the shale formation. Early researches have studied thoroughly on the physicochemical and mechanical mechanism that causes instability. However, only a few works have considered the influence of field drilling operations, such as drill pipe rotation. In this paper, a true triaxial cell is used to simulate the downhole field situations, and a drill pipe rotation device is innovatively designed and implemented into the true triaxial cell. Using this facility, the influence of drill pipe rotation on shale instability has been performed. Different rotation speed, weight on bit, drilling fluid pressure, and microcracks on borehole have been considered. The enlargement of the wellbore is quantitatively plotted and compared.Results show that the drill pipe rotation contributes to a more enlargement of the wellbore, and a higher rotation speed causes a more severe collapse. The drill string weight on bit also contributes to the enlargement of the wellbore, with a larger weight on bit induces a larger diameter of the collapsed wellbore. Compared with the rotation speed and weight on bit, the influence of drilling fluid density is relatively less significant. However, the influence of microcracks caused by hitting of drilling tools is profound. For a cracked shale formation, the wellbore diameter can be enlarged for more than 40%. Then, the variation of borehole collapse with time and depth under drill pipe rotation influence is analyzed. In all of these four factors, the significant sequence is microcracks > weight on bit > rotation speed > drilling fluid pressure.In all the collapse phenomena, the collapse is more severe in the minimum horizontal stress direction. This is explained by the analysis of the stress distribution in the whole circumferential angle (360°) of the wellbore. Overall, this work fills the gap of the influence of drilling operations on wellbore instability. K E Y W O R D Sborehole enlargement, drill pipe rotation, true triaxial cell, wellbore instability 2896 | SUN et al.

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Consequences and Relevance of Drillstring Vibration on Wellbore Stability

Abstract: This paper was prepared for presentation at the 1999 SPE/IADC Drilling Conference held in Amsterdam, Holland, 9-11 March 1999.

Cited by 21 publications

References 7 publications

Pre-Spud Mud Loss Flow Rate in Steeply Folded Structures

Pre-Spud Mud Loss Flow Rate in Steeply Folded Structures

Numerical Investigation of the Influence of the Drill String Vibration Cyclic Loads on the Development of the Wellbore Natural Fracture

Large‐scale experiments of the borehole instability on shale formation influenced by drill pipe rotation

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