Mechanism and Characteristics of Horizontal-Wellbore Cleanout by Annular Helical Flow

Song, Xianzhi; Li, Gensheng; Zhang, Laibin; Huang, Zhongwei; Tian, Shouceng; Wang, Haizhu

doi:10.2118/156335-pa

Cited by 14 publications

(5 citation statements)

References 13 publications

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“…6,7 Particles movement research has attracted considerable attention. 8–11 A schematic of sand transport in a horizontal well section is shown in Figure 1(a), wherein washing fluid first destroys the sand bed in the blocking area, and then sand starts to slide against the casing steel. Figure 1(b) shows particles slide and transport between tool and casing, Figure 1(c) shows single quartz sand particle slide against N80 casing steel during initial movement.…”

Section: Introductionmentioning

confidence: 99%

Friction and wear behaviors of sand particle against casing steel

Yang

Wang

Guo

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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Tools abrasive wear due to sand particles has caused severe damage during oil and gas exploitation. The friction and wear behaviors of single quartz sand particle against N80 casing steel were investigated to estimate the particle transport resistance and particle abrasive wear behavior using a homemade tribometer in wellbore sand cleanout. Various measurements were conducted to research the impact factor of particle under different water processing condition, dry, short immersion, wet, influences of load and slide velocity. Experimental results indicated that particle-casing friction resistance is mainly formed due to plowing and adhesion effect. Casing transfer and plowing removal are two main damage forms. Particle real contact area increases noticeably after water absorption, which decreases the hertz contact stress and finally produces less plowing depth of casing steel and causes less damage. With load increasing, friction resistance and wear increase with addition of plowing depth. A simple particle-casing friction model was established considering the experimental contact behavior.

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Section: Introductionmentioning

confidence: 99%

Friction and wear behaviors of sand particle against casing steel

Yang

Wang

Guo

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Fig 1 shows a wellbore model with a typical helical flow cleanout tool [ 2 ], with 130 mm (inner diameter) casing and 50.8 mm (outer diameter) coiled tubing. As shown in Fig 2 , nine nozzles are assembled on the jetter, grouped as forward nozzles, lateral nozzles and rear nozzles.…”

Section: Methodsmentioning

confidence: 99%

“…In horizontal wells, the flow direction is perpendicular to the gravity, so the sands have a tendency to settle down, resulting in low cleanout efficiency or even worse troubles such as stuck-pipe [ 1 ]. Over the past years, several improved cleanout techniques, such as wiper tripping and sand vacuuming [ 2 ], have been developed. Among these techniques, the helical flow approach, which applies partial high-pressure jets to generate spiral flow in annulus, has been verified to be efficient by simulations and field applications [ 3 – 6 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of Operation Parameters for Helical Flow Cleanout with Supercritical CO2 in Horizontal Wells Using Back-Propagation Artificial Neural Network

Song

Peng

et al. 2016

PLoS ONE

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Sand production and blockage are common during the drilling and production of horizontal oil and gas wells as a result of formation breakdown. The use of high-pressure rotating jets and annular helical flow is an effective way to enhance horizontal wellbore cleanout. In this paper, we propose the idea of using supercritical CO2 (SC-CO2) as washing fluid in water-sensitive formation. SC-CO2 is manifested to be effective in preventing formation damage and enhancing production rate as drilling fluid, which justifies tis potential in wellbore cleanout. In order to investigate the effectiveness of SC-CO2 helical flow cleanout, we perform the numerical study on the annular flow field, which significantly affects sand cleanout efficiency, of SC-CO2 jets in horizontal wellbore. Based on the field data, the geometry model and mathematical models were built. Then a numerical simulation of the annular helical flow field by SC-CO2 jets was accomplished. The influences of several key parameters were investigated, and SC-CO2 jets were compared to conventional water jets. The results show that flow rate, ambient temperature, jet temperature, and nozzle assemblies play the most important roles on wellbore flow field. Once the difference between ambient temperatures and jet temperatures is kept constant, the wellbore velocity distributions will not change. With increasing lateral nozzle size or decreasing rear/forward nozzle size, suspending ability of SC-CO2 flow improves obviously. A back-propagation artificial neural network (BP-ANN) was successfully employed to match the operation parameters and SC-CO2 flow velocities. A comprehensive model was achieved to optimize the operation parameters according to two strategies: cost-saving strategy and local optimal strategy. This paper can help to understand the distinct characteristics of SC-CO2 flow. And it is the first time that the BP-ANN is introduced to analyze the flow field during wellbore cleanout in horizontal wells.

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“…Especially in wells that have a high inclination, if the fluid velocity is lower than a critical value, a stationary bed develops, which may cause several problems, such as a higher probability of stuck pipe, high drag, higher hydraulic requirements, etc., if not removed properly [1][2][3][4][5]. In order to avoid such problems, generated cuttings have to be removed from the wellbore with the help of drilling fluid.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Comparison Study of Empirical Cutting Transport Models in Inclined and Horizontal Wells

Shiddiq¹,

Christiantoro²,

Syafri³

et al. 2017

J. Eng. Technol. Sci.

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Abstract. In deviated and horizontal drilling, hole-cleaning issues are a common and complex problem. This study explored the effect of various parameters in drilling operations and how they affect the flow rate required for effective cutting transport. Three models, developed following an empirical approach, were employed: Rudi-Shindu's model, Hopkins', and Tobenna's model. RudiShindu's model needs iteration in the calculation. Firstly, the three models were compared using a sensitivity analysis of drilling parameters affecting cutting transport. The result shows that the models have similar trends but different values for minimum flow velocity. Analysis was conducted to examine the feasibility of using Rudi-Shindu's, Hopkins', and Tobenna's models. The result showed that Hopkins' model is limited by cutting size and revolution per minute (RPM). The minimum flow rate from Tobenna's model is affected only by well inclination, drilling fluid weight and drilling fluid rheological property. Meanwhile, Rudi-Shindu's model is limited by inclinations above 45°. The study showed that the investigated models are not suitable for horizontal wells because they do not include the effect of lateral section.

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Mechanism and Characteristics of Horizontal-Wellbore Cleanout by Annular Helical Flow

Cited by 14 publications

References 13 publications

Friction and wear behaviors of sand particle against casing steel

Friction and wear behaviors of sand particle against casing steel

Optimization of Operation Parameters for Helical Flow Cleanout with Supercritical CO2 in Horizontal Wells Using Back-Propagation Artificial Neural Network

A Comprehensive Comparison Study of Empirical Cutting Transport Models in Inclined and Horizontal Wells

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