Twenty Years of Successful Coiled Tubing Re-Entry Drilling With E-Line BHA Systems - Improving Efficiency and Economics in Maturing Fields Worldwide

Krueger, S.; Pridat, Lars

doi:10.2118/179046-ms

Cited by 8 publications

(2 citation statements)

References 6 publications

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“…This CTD system has been tested or applied in the Middle East, Europe, America, Australia, Southeast Asia, and other places. 1…”

Section: Introductionmentioning

confidence: 99%

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Displacement vectors control method for orienter ribs during path correction in coiled tubing drilling

Hu³

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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The well path easily deviates from the original design trajectory during coiled tubing drilling, which needs to be corrected with an orienter. A three-segment correction trajectory with two arc segments and a line segment is constructed based on the differential geometry principle, and the direction at the target is consistent with the direction of the original borehole. Based on the parameters of the design correction trajectory, a mathematical relationship between trajectory parameters and the displacement vectors of orienter ribs is established by using the vector analysis method. According to the principle of minimum energy, the problem of multisolvability in mathematics is avoided. Then, the control model of the displacement vectors of orienter ribs with the parameters' variation of the designed correction trajectory is established. The similarly periodic variation rule of displacements of orienter ribs with the variation of tool face angle is obtained, and the closed-loop control scheme for correction trajectory while drilling is made. The results of field test show that by using coiled tubing drilling, during the circular arc section of the designed three-segment correction trajectory, the displacement vectors of orienter ribs vary similarly periodically, which is called the directional drilling mode. During drilling in the slanted segment, the displacements of each rib are equal, which is called the keeping drilling mode. The design method of correction trajectory and the displacement vector control method of the orienter ribs are practicable during path correction in coiled tubing drilling, which is helpful to improve the efficiency of coiled tubing drilling.

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“…This CTD system has been tested or applied in the Middle East, Europe, America, Australia, Southeast Asia, and other places. 1…”

Section: Introductionmentioning

confidence: 99%

“…Currently, there is still a lack of closed control method in the process of trajectory correction during CTD yet. 1…”

Section: Introductionmentioning

confidence: 99%

Displacement vectors control method for orienter ribs during path correction in coiled tubing drilling

Hu³

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Orientation load prediction method based on randomness/stochasticity of multi-source parameters in coiled tubing drilling

et al. 2020

Journal of Petroleum Science and Engineering

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Experimental Investigation of Coiled Tubing Buckling Effect on Annular Frictional Pressure Losses

Abbas

Alhameedi

Alsaba

et al. 2020

Day 1 Tue, March 24, 2020

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Coiled tubing (CT) technology has been widely used in oilfield operations, including workover applications. This technology has achieved considerable economic benefits; however, it also raises new challenges. One of the main challenges that were encountered while using this technology is the buckling of the CT string. It can occur when the axial compressive load acting on the CT string exceeds the critical buckling loads, especially in highly deviated/horizontal and extended reach wells. Moreover, this issue becomes more critical when using non-Newtonian fluids. Therefore, the major focus of this study is to identify the frictional pressure loss of non-Newtonian fluids in an annulus with a buckled inner tubing string. In the present study, a laboratory-scale flow loop was used to investigate the influence of various buckling configurations (i.e., sinusoidal, transitional, and helically) of the inner pipe on the annular frictional pressure losses while circulating non-Newtonian drilling fluids. The experiments were conducted on a horizontal well setup with a non-rotating buckled inner pipe string, considering the impact of steady-state isothermal of laminar, transition, and turbulent flow regions on frictional pressure losses. Six different Herschel-Bulkley fluids were utilized to examine the dependence of pressure losses on fluid rheological properties (i.e., yield stress, consistency index, and flow behavior index). Experiments showed potential to significantly decrease the frictional pressure losses as the axial compressive load acting on the inner pipe increases. The effect of buckling was more pronounced when fluids with higher yield stress and higher shear-thinning ability were used. In addition, by comparing the non-compressed and the compressed inner pipe, an additional reduction in frictional pressure losses occurred as the axial compressive load increased. However, the effect of the compressed inner pipe was insignificant for fluids with a low yield stress, consistency index, and high-flow-behavior index, especially in the laminar region. The information obtained from this study will contribute toward providing a more comprehensive and meaningful interpretation of fluid flow in the vicinity of a buckled coiled tubing string. In the same manner, accurate knowledge of the predicted friction pressure will improve safety and enhance the optimization of coiled tubing operations.

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Twenty Years of Successful Coiled Tubing Re-Entry Drilling With E-Line BHA Systems - Improving Efficiency and Economics in Maturing Fields Worldwide

Cited by 8 publications

References 6 publications

Displacement vectors control method for orienter ribs during path correction in coiled tubing drilling

Displacement vectors control method for orienter ribs during path correction in coiled tubing drilling

Orientation load prediction method based on randomness/stochasticity of multi-source parameters in coiled tubing drilling

Experimental Investigation of Coiled Tubing Buckling Effect on Annular Frictional Pressure Losses

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