Subsea Christmas Tree Tubing Hanger Installation by Simplified Landing String

Abstract

Abstract:

The simplified landing string is introduced to Liuhua 4-1 Field for the installation of subsea Christmas tree (XT) tubing hanger, considering the low pressure in reservoir and absence of shallow gas. After demonstrating the feasibility of the simplified landing string system, the main equipment of this system is introduced, including the simplified landing string, umbilical system, tubing hanger running tool and tubing hanger. Then the control factors and restriction conditions are represented, followed by the detailed description of installation steps. Finally, a comparison is made between the application of conventional landing string and simplified landing string. The results can offer a reference for the exploitation of marginal subsea fields.

Key words: subsea production system, simplified landing string, tubing hanger, tubing hanger running tool, control umbilical for simplified landing string

CLC Number:

TE42

Ning ZHANG, Jia-you MAO, Jian-jun YANG. Subsea Christmas Tree Tubing Hanger Installation by Simplified Landing String[J]. Ocean Engineering Equipment and Technology, 2015, 2(3): 145-151.

Figures/Tables 8

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Table 1

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Fig.7

管线编号	液压管尺寸/mm	最大工作压力/psi	管线功能
A	12.3(外径),6.35(内径)	5 000	油管挂锁紧(HWL)
B	12.3(外径),6.35(内径)	5 000	油管挂锁紧确认(HWLV)
C	12.3(外径),6.35(内径)	5 000	油管挂解锁(HWUL)
D	12.3(外径),6.35(内径)	5 000	油管挂下入回收工具锁紧确认(THLV)
E	12.3(外径),6.35(内径)	5 000	油管挂下入回收工具解锁(THUL)
F	12.3(外径),6.35(内径)	5 000	油管挂下入回收工具锁紧(THL)
G	12.3(外径),6.35(内径)	5 000	井下安全阀(SCSSV)
H	12.3(外径),6.35(内径)	5 000	备用
管线编号	电缆尺寸/mm²	最大工作电压/kV	管线功能
E1	2.5(4芯)	0.6/1.0	ESP测试
E2	2.5(4芯)	0.6/1.0	ESP测试

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