Ocean Engineering Equipment and Technology ›› 2015, Vol. 2 ›› Issue (3): 145-151.

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Subsea Christmas Tree Tubing Hanger Installation by Simplified Landing String

Ning ZHANG, Jia-you MAO, Jian-jun YANG   

  1. Shenzhen Branch of CNOOC Ltd., Shenzhen Guangdong 518067, China
  • Received:2015-05-22 Online:2015-06-10 Published:2016-01-21


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: