Finite Element Analysis of the Influence of Tide Velocity on the Borehole Entering of Drilling Riser

doi:10.3969/j.issn.1006-396X.2022.03.012

Abstract

Abstract:

A high tide velocity makes it difficult for the riser to enter the borehole during its running after the riser section is drilled. A finite?element fluid?solid coupling model of fluid (seawater) and solid (casing) interaction is built with the finite?element analysis software ADINA. The following observations can be made from the analysis. A higher velocity results in a larger lateral offset in the final equilibrium state when the riser enters the borehole.Due to the flow blocking effect of the riser, seawater near the front end of the riser produces a strong detouring flow, while a local vortex is observed in the area near the back end of the riser.Under four working conditions of different tide velocities (0.60,0.70,0.80 and 0.90 m/s), both the Reynolds number and the equivalent flow resistance coefficient are in reasonable ranges.When the borehole diameter reaches 889.0 mm after borehole enlargement, a 508.0 mm riser is run in. No obstruction is encountered when the tide velocity is less than 0.59 m/s, whereas difficult borehole entering occurs when the tide velocity is higher than 0.83 m/s. It is suggested that the riser will be run in when the tide velocity reduces to below 0.59 m/s. The simulation analysis has a great guiding significance for the running of the riser during the drilling of offshore oil fields.

Key words: Riser, Velocity, Borehole entering, Solid?liquid coupling, Finite element

摘要：

在钻完导管段后下隔水导管时，受潮水流速的影响，若潮水流速较大则会导致隔水导管入孔困难。通过有限元分析软件ADINA，建立了流体?海水与固体?套管相互作用的流固耦合有限元模型。经过分析可知，潮水流速越大，导管入孔时最终平衡状态下的横向偏移量越大；由于隔水导管的阻流作用，靠近导管前端潮水产生很强的绕流，导管后端附近区域产生局部涡流；在4种潮水流速（0.60、0.70、0.80、0.90 m/s）下，雷诺数及当量绕流阻力系数均处于合理区间；当钻井井眼扩径后井径为889.0 mm、下入508.0 mm隔水导管时，在潮水流速小于0.59 m/s时，不会发生遇阻现象；在潮水流速大于0.83 m/s时，会出现入孔困难现象。因此，建议潮水流速下降至0.59 m/s以下再下入隔水导管。模拟分析结果对海上油田钻入法下隔水导管具有较好的指导意义。

关键词: 隔水导管, 流速, 入孔, 固液耦合, 有限元

CLC Number:

TE953

Chenglong Sui, Jiayu Lin, Jin Li, Wenping Yu, Liuwei Li. Finite Element Analysis of the Influence of Tide Velocity on the Borehole Entering of Drilling Riser[J]. Journal of Petrochemical Universities, 2022, 35(3): 75-80.

隋成龙, 林家昱, 李进, 尉文平, 李留伟. 潮水流速对钻井隔水导管入孔影响的有限元分析[J]. 石油化工高等学校学报, 2022, 35(3): 75-80.

Figures/Tables 11

Fig.1 Geometric model of conduit and seawater

Fig.2 Geometric model of seawater grid

Fig.3 Variation of lateral offset of liner with time

Fig.4 Vector diagram of tidal velocity and sea tide velocity around riser conduit

Fig.5 Evaluate different path location for relative changes in tidal velocity

Fig.6 The relationship curve of horizontal distance between each node on route line 1 to line 5 and the riser and tidal velocity at the node

Fig.7 The relationship curve between velocity and velocity square/lateral offset of pipe shoe

Table 1 Flow resistance,drag coefficient and reynolds number of riser under different tidal velocity

工况	V_X /(m $⋅$ s^-1)	F/(N·m^-1)	C_D	Re×10^-5
1	0.90	155	0.731	3.14
2	0.80	123	0.734	2.79
3	0.70	94	0.733	2.44
4	0.60	69	0.732	2.09
5	0.50	47	0.719	1.74
6	0.40	29	0.693	1.40

Table 1 Flow resistance,drag coefficient and reynolds number of riser under different tidal velocity

工况	V_X /(m $⋅$ s^-1)	F/(N·m^-1)	C_D	Re×10^-5
1	0.90	155	0.731	3.14
2	0.80	123	0.734	2.79
3	0.70	94	0.733	2.44
4	0.60	69	0.732	2.09
5	0.50	47	0.719	1.74
6	0.40	29	0.693	1.40

Fig.8 Experimental data curves of reynolds number and drag coefficient of flow around finite and infinite cylinders

Fig.9 Schematic diagram of allowable deviation between wellbore and riser

Table 2 Entry condition of riser

井号	钻头直径/mm	隔水导管直径/mm	下隔水管时间	流向（北偏东）/（°）	流速/（m $⋅$ s^-1）	下入情况
L5	660.4	508.0	2021/02/25 05:00	158	0.38	顺利
S3	660.0	508.0	2021/05/13 15:00	34	0.75	导管入孔

Table 2 Entry condition of riser

井号	钻头直径/mm	隔水导管直径/mm	下隔水管时间	流向（北偏东）/（°）	流速/（m $⋅$ s^-1）	下入情况
L5	660.4	508.0	2021/02/25 05:00	158	0.38	顺利
S3	660.0	508.0	2021/05/13 15:00	34	0.75	导管入孔

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