Research and Field Test on Life-Long Water Control Completion Technology in Offshore Oilfields

GUO Yi1 GAO Xiaofei1 YI Huian2 DAI Ling1 XU Liqian1 LIU Jia1

(1.Shenzhen Branch of CNOOC Ltd., Shenzhen, Guangdong 518000)
(2.STARSE Energy and Technology (Group) Co., Ltd., Beijing 100101)
【Novelty】To achieve the effective development of bottom-water reservoirs and slow down the increase in water cut in wells, experts both at home and abroad usually adopt an inflow control device (ICD) and an autonomous inflow control device (AICD). However, the limitations of the two approaches make it impossible for them to realize life-long water control. In this paper, the advantages of ICD and AICD are combined. During the early production period, the high-permeability section is constrained to balance the liquid supply profile in the horizontal section of the horizontal wells. In the later periods, the “autonomous flow rate control” is used to constrain the liquid flow of the horizontal high water content section, which can slow down the increase in water cut by autonomous water control. The technology is first tested in the field of Well W1 in Zhujiangkou Basin in the South China Sea and is proved to be successful, which has increased well production and reduced water content.

【Abstract】Aiming at solving the problem of rapid coning of bottom water during the development by horizontal wells in the sandstone reservoirs with bottom water in offshore oilfields, a life-long water control completion technology for offshore oilfields was studied based on the analysis of the advantages and disadvantages of the inflow control device (ICD) and the autonomous inflow control device (AICD). The technology combined the advantages of ICD and AICD. During the early production period, the high-permeability section was constrained to balance the fluid supply profile in the horizontal section of the horizontal wells. In the later periods, the “autonomous flow rate control” was used to constrain the fluid output of the horizontal high water cut section, which could slow down the increase in water cut by autonomous water control. The technology was tested on-site in Well W1 in Reservoir H of Oilfield X. By comparing with production wells in the same reservoir, it is shown that the life-long water control completion technology can restrain the increase in water cut in the development by horizontal wells and is worthy of expanding the test scale.

【Keywords】 life-long water control completion; offshore oilfield; horizontal well; bottom water coning; production stabilization and water control; field test;

【DOI】

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This Article

ISSN:1001-0890

CN:11-1763/TE

Vol , No. 06, Pages 93-98

September 2021

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Novelty

Abstract

  • 1 Advantages and disadvantages of ICD and AICD water control completion
  • 2 Principle and optimization design principle of life-long water control completion technology
  • 3 Field test
  • 4 Conclusions and suggestions
  • References