New Developments in Short-, Medium-, and Long-Radius Lateral Drilling

Karlsson, H.; Cobbley, R.; Jaques, G.E.

doi:10.2523/18706-ms

Cited by 7 publications

(6 citation statements)

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“…The supplementary condition to a step of the flexible sub is that the shear forces of two sides of the step are equal and denoted by Equations (10) and (11).…”

Section: Supplementary Condition and Equation Of The Flexible Submentioning

confidence: 99%

“…During the course of wellpath control, the key task is to predict and adjust the BUR to hit the target. The existing BUR prediction methods mainly include the three-point circular method (TPCM) [9,10] and its modified methods [11][12][13], the equilibrium curvature method (ECM) [14] and its modified methods [15], and the equilibrium tendency method (ETM) [16,17]. The TPCMs only consider the geometric configurations of the BHA.…”

Section: Introductionmentioning

confidence: 99%

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A Powerful Build-Up Rate (BUR) Prediction Method for the Static Push-the-Bit Rotary Steerable System (RSS)

et al. 2020

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The RSS has been widely used in directional drilling. In order to enhance wellpath control accuracy and efficiency of the static push-the-bit RSS, a powerful BUR prediction method is reconstructed by coupling a rotary steerable bottom-hole assembly (RSBHA) mechanical model and a drill bit–rock interaction model. This article showed that when establishing the RSBHA mechanical model by using the continuous beam column method, the steering rib should be treated as an eccentric stabilizer to consider the contact effect between the steering rib and wellbore wall. For the beam column containing the flexible sub and between two stabilizers, it should be rearranged into three beam columns, and the lower and upper steps of the flexible sub should be considered as virtual supports. The equilibrium tendency method (ETM) to predict the BUR can enhance wellpath prediction accuracy than those of traditional methods. Under 3D conditions, the total drilling tendency angle should be denoted by inclination tendency angle and azimuth tendency angle to enhance the solution efficiency. Case analyses have verified that the average forecast error of the BUR prediction model in this article is less than 1°/30 m.

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“…The supplementary condition to a step of the flexible sub is that the shear forces of two sides of the step are equal and denoted by Equations (10) and (11).…”

Section: Supplementary Condition and Equation Of The Flexible Submentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Powerful Build-Up Rate (BUR) Prediction Method for the Static Push-the-Bit Rotary Steerable System (RSS)

et al. 2020

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“…Many researchers have used the geometric relationship between the short length and relatively high rigidity of the steering tool assembly to predict the tool's deflection rate and have achieved remarkable results. Karlsson and his group ( Karlsson and Brassfield,1985;Karlsson et al,1989) used the fact that wellbore trajectories are similar to arcs to propose a three-point geometry for predicting the buildup rate, and their approach has become widely used. Based on this, Hassen and MacDonald (Hassen and MacDonald,1990) analyzed the buildup rate of double-bend drilling tools and proposed the double-radius method for predicting the buildup rate.…”

Section: Introductionmentioning

confidence: 99%

Influence of a combined bearing on the buildup rate of a wellbore trajectory control tool

Shi¹,

Wang²,

Yang³

et al. 2020

JAMDSM

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Conventional methods cannot accurately predict buildup rate. In this study, an algorithm was developed to predict the geometric deflection rate of the tool considering the influence of the radial displacement of a combined bearing. Three-point geometry was used to calculate the buildup rate and its relationship with the radial displacement of the combined bearing. The relation between the maximum spindle deflection and the load of the combined bearing was also determined by treating the spindle as a statically indeterminate beam. To consider the internal structural parameters of the combined bearing, a mathematical relationship was obtained between its load and radial displacement with the Stribeck maximum rolling element load formula and Palmgren roller bearing displacement formula. The influence of the structural parameters of the combined bearing on the buildup rate was analyzed, and the results showed that the buildup rate can be increased by increasing the thickness and pre-compression of the disc spring and decreasing its diameter ratio and the radial clearance of the self-aligning roller bearing. An experimental device was used to obtain test results with different maximum spindle deflection values. In particular, the error was less than 1% when the maximum spindle deflection was more than 4 mm.

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“…[13][14][15] Some statics algorithms are also developed to directly predict the well trajectory in the stable drilling process. 16,17 In this article, section ''Modeling of the drillstringwellbore contact and the bit-rock interaction'' introduces a practical drillstring-wellbore contact model and a bit-rock interaction model. Section ''Drilling system governing equation and solution'' presents a multibody dynamics model of the drilling system, and the system governing equation is presented.…”

Section: Introductionmentioning

confidence: 99%

A multibody dynamics model of contact between the drillstring and the wellbore and the rock penetration process

Wang

Cheng

et al. 2015

Advances in Mechanical Engineering

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This article models the contact between the drillstring with large slenderness ratio and the extending rigid wellbore based on the multibody dynamics method. The drillstring is modeled as absolute nodal coordinate formulation beams with contact detection points. An algorithm is developed to locate the contact points and calculate the contact forces when the drillstring is sliding and rotating in the wellbore. This provides support force and friction for the moving drillstring and effectively confines it inside the wellbore. A rock penetration model is established based on the rock-breaking velocity equation. The governing equation for the full-hole drilling system including the drillstring and the contact model is established and solved. A rock penetration correction method is proposed to stabilize the computation and to model and simulate the slide drilling process. A field drilling process is modeled and simulated. The simulation result fits the experimental result well.

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New Developments in Short-, Medium-, and Long-Radius Lateral Drilling

Cited by 7 publications

References 0 publications

A Powerful Build-Up Rate (BUR) Prediction Method for the Static Push-the-Bit Rotary Steerable System (RSS)

A Powerful Build-Up Rate (BUR) Prediction Method for the Static Push-the-Bit Rotary Steerable System (RSS)

Influence of a combined bearing on the buildup rate of a wellbore trajectory control tool

A multibody dynamics model of contact between the drillstring and the wellbore and the rock penetration process

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