Old well sidetracking selection standards: Sulige low-permeability gas field, China

Yuan, Yilong; Zhang, Qi; Yan, Wende; Zhang, Ji; Chen, Cen

doi:10.1007/s13202-019-00827-x

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…The casing window sidetracking technology is widely used in the recovery of residual oil in aged oil fields, especially in multilateral wells [1,2]. Its aim is to cut out a slanting and smooth window at the designated position on the casing wall of the original well hole by using sidetracking tools along the whipstock [3,4]. The huge expansion of sidetracking technology has facilitated the application of an increasing number of sidetracking systems, in which tool systems have had a significant impact on the success of sidetracking.…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Dynamic Model for Characterizing the Downhole Motions of the Sidetracking Tool in a Multilateral Well

et al. 2023

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It is of practical interest to investigate the mechanical behaviors of a sidetracking tool system and to describe the sidetracking tool’s vibration mechanical response, as this can provide an important basis for evaluating and optimizing the tool structure and effectively controlling the profile of the sidetracking window. In this article, three nonlinear dynamic models with ten, six, and two degrees of freedom, respectively, are established using the Lagrange method to characterize the behavior of the sidetracking tool. It should be noted that in these models, the axial, lateral, and torsional vibration of the tool system are fully coupled. The process of the sidetracking tool mills in the casing-pipe wall is divide into three typical stages, i.e., the window mill, pilot mill, and watermelon mill grinding the casing, respectively. The dynamic response of the three stages is studied to more effectively analyze the influence of the sidetracking tool vibration deformation on the window width. The Runge–Kutta method, which is easy to implement, is applied to solve the supposed nonlinear dynamic model, and some useful findings are as follows. The effects of sidetracking tool vibrations at different stages on window widening size are illustrated quantitatively. The vibration trajectory pattern of the sidetracking tool is different from that of the conventional drilling tool due to the influence of the whipstock, which changes from the general whirling motion pattern to the X reciprocating pattern, and the vibration amplitude decreases. Due to the influence of the tool’s lateral amplitude, the window profile is widened. The widened window size of the window mill and the pilot mill are 3.30 mm and 2.74 mm, respectively, and the extended window size of the watermelon mill is 0.07 mm, while the maximum window width formed by the sidetracking tool is 374.34 mm. This work proposes, for the first time, the coupled vibration model of the sidetracking tool system, which is helpful to better understand the nonlinear dynamic effects of the sidetracking tool, laying the foundation for the optimization of the sidetracking parameters.

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Section: Introductionmentioning

confidence: 99%

A Nonlinear Dynamic Model for Characterizing the Downhole Motions of the Sidetracking Tool in a Multilateral Well

et al. 2023

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Mechanical model of the casing sidetracking tool system considering weight on bit and axial displacement

Zhu¹,

Zhou²,

Zhao³

et al. 2023

Geoenergy Science and Engineering

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Eccentric array-based borehole transient electromagnetic system for NDT of multipipe strings in sidetrack well

Yang

Dang

et al. 2021

J. Phys.: Conf. Ser.

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In the middle and late stage of oilfield development, the sidetracking technology is widely used for restoring the production of stripper well, damaged well and abandoned well. In this paper, we present an eccentric array-based borehole transient electromagnetic (TEM) system for nondestructive testing (NDT) of multipipe strings in sidetrack well. Using the borehole TEM signal model, the response of eccentric sensor is analyzed, which contains more information in the direction of eccentricity. On this basis, multiple eccentric sensors with different depths and different angles are utilized to form an eccentric array, which can be used to determine the direction of sidetracking and to detect the multiple pipes in hanging casing strings. The performance of the proposed system was verified by applying it to sidetrack wells in Shengli oilfield. In addition, field experiments were conducted, and the results demonstrated the effectiveness of the proposed method.

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Old well sidetracking selection standards: Sulige low-permeability gas field, China

Cited by 3 publications

References 27 publications

A Nonlinear Dynamic Model for Characterizing the Downhole Motions of the Sidetracking Tool in a Multilateral Well

A Nonlinear Dynamic Model for Characterizing the Downhole Motions of the Sidetracking Tool in a Multilateral Well

Mechanical model of the casing sidetracking tool system considering weight on bit and axial displacement

Eccentric array-based borehole transient electromagnetic system for NDT of multipipe strings in sidetrack well

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