Simulation Analysis of Cementing Displacement in Offshore Extended Reach Well

Abstract

Abstract:

Displacement efficiency and interface stability are critical to the success of offshore extended reach well cementing. According to the theory of computational fluid dynamics and the basic cementing data of extended reach well in South China Sea, the cement slurry rheological property and the influence of different borehole conditions on cementing displacement are obtained by numerical simulation. The calculations demonstrate that displacement efficiency increases with the increase of cement slurry consistency index and decreases with the increase of cement slurry flow index; well-cementing displacement efficiency first increases and then decreases and finally tends to be stable as the yield stress increases; the flow index of cement slurry should not be too high when cementing, and the value of n should be controlled within 0.6; the consistency index should be greater than 1.5 Pa·sⁿ, but not exceed 3 Pa·sⁿ; yield stress in the range of 10~18 Pa is advantageous to replace drilling fluid with the cement slurry. It is suggested that the eccentricity should be controlled within 0.5 as eccentricity has a great influence on the stability of interface; the stability of interface is obviously improved by using casing centralizer, and the optimized best rigid centralizer swirl angle is 60°; casing buckling, causing significant reduction of displacement efficiency in the annular interface, has a great influence on the stability of interface.

Key words: extended reach well, annular structure, displacement efficiency, interface stability, numerical simulation

CLC Number:

P752

Hao LI, Jin-tang WANG, Bao-jiang SUN, Cheng-zhang CAO, Chun-li LI, Ke-wang XU. Simulation Analysis of Cementing Displacement in Offshore Extended Reach Well[J]. Ocean Engineering Equipment and Technology, 2014, 1(1): 14-20.

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References 16

[1]	Modi S, Mason C J, Tooms PJ, et al.Meeting the 10 km drilling challenge[C]. SPE, 1997: 38583.
[2]	吴爽, 李骥, 张焱. 大位移井技术研究的现状分析[J]. 石油钻探技术, 2002, 30(5): 17.
[3]	Dutra ES, Martins AL, Miranda C R, et al.Dynamics of fluid substitution while drilling and completing long horizontal-section wells[C]. SPE, 2005: 94623.
[4]	蒋世全. 大位移井技术的发展现状及启示[J]. 中国海上油气(工程), 1999, 11(3): 14.
[5]	连吉弘, 康建平. 大位移井固井技术分析[J]. 长江大学学报: 自然科学版, 2010, 7(1): 205.
[6]	陈家琅, 黄匡道, 刘永健, 等. 定向井固井注水泥顶替效率研究[J].石油学报, 1990, 11(3): 98.
[7]	王瑞和, 李明忠, 王成文, 等. 油气井注水泥顶替机理研究进展[J]. 天然气工业, 2013, 33(5): 69.
[8]	Couturler M, Guillot D, Hendriks H, et al.Design rules and associated spacer properties for optimal mud removal in eccentric annuli[C]. CIM/SPE International Technical Meeting, 1990: 21594.
[9]	韩占忠, 王敬, 兰小平. FLUENT流体工程仿真计算实例与应用[M]. 北京: 北京理工大学出版社, 2004. 19-26.
[10]	高永海, 孙宝江, 刘东清, 等. 环空水泥浆顶替界面稳定性数值模拟研究[J]. 石油学报, 2005, 26(5): 120.
[11]	刘崇建. 油气井注水泥理论与应用[M]. 北京: 石油工业出版社, 2000. 295-307.
[12]	王伟, 黄柏宗.高温高压下水泥浆的流变性及其模式[J]. 油田化学, 1994, 26(1): 18.
[13]	高永海, 孙宝江, 赵欣欣, 等.前置液流变性对顶替界面稳定性影响的数值模拟[J]. 中国石油大学学报: 自然科学版, 2007, 31(6): 51.
[14]	郑永刚, 方铎, 郝俊芳. 水平井注水泥的理论与实验研究[J]. 水动力学研究与进展, 1996, 11(1): 19.
[15]	Jakobsen J, Sterri N, Saasen A, et al.Displacements in eccentric annuli during primary cementing in deviated wells[C]. SPE, 1991: 21686.
[16]	王秀文, 刘巨保, 黄金波, 等. 固井过程套管串屈曲变形分析[J]. 石油矿场机械, 2011, 40(4): 17.

	密度/ (kg·cm^-3)	屈服值 /Pa	n	k	黏度 /mPa·s
前置液	1100	5.00	0.630	0.43	24
首浆	1570	12.17	0.756	0.64	87
尾浆	1900	18.44	0.660	1.31	90