Li Hao, Sun Baojiang, Gao Yonghai, Wang Jintang, Wang Ning. Design and Calculation of Hydraulic Parameters for Controlling Mud Cap in Deepwater Drilling[J]. Petroleum Drilling Techniques, 2013, 41(3): 13-18. DOI: 10.3969/j.issn.1001-0890.2013.03.003
Citation: Li Hao, Sun Baojiang, Gao Yonghai, Wang Jintang, Wang Ning. Design and Calculation of Hydraulic Parameters for Controlling Mud Cap in Deepwater Drilling[J]. Petroleum Drilling Techniques, 2013, 41(3): 13-18. DOI: 10.3969/j.issn.1001-0890.2013.03.003

Design and Calculation of Hydraulic Parameters for Controlling Mud Cap in Deepwater Drilling

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  • Received Date: February 28, 2013
  • Revised Date: May 09, 2013
  • Deepwater control mud cap drilling is an advanced technology to deal with thief zone,high-pressure and high sulfur-bearing formation,but its drilling hydraulic parameters design and calculation are more complex.According to the drilling process in deepwater,the calculation model of BHP for deepwater control mud cap drilling was established.The guidelines for determining drilling fluid density under different conditions and calculation method of ECD were proposed,based on the analysis of circulating pressure loss,the calculating methods for pump pressure were put forward at subsea and surface respectively.The calculation method of mud cap height was proposed according to the characteristics of wellbore pressure distribution in thief zone,high pressure and high sulfur-bearing formation.Based on the wellbore cleaning rule and the relationship between lost amount and lost pressure differential,the calculation method of sacrificed flow rate was proposed,and hydraulic parameter design process for deep water controlled mud cap drilling was put forward.Based on the basic data of a deepwater well,hydraulic parameters for deepwater mud cap drilling were calculated and analyzed.The results show that the mud cap height is mainly decided by bottom-hole pressure,the density and flow rate have some impact,thus wellbore pressure can be controlled by adjusting the mud cap height.
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