Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (2): 146-153.doi: 10.12108/yxyqc.20180216

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Normal annular pressure regularity in “A” annulus for high sulphur gas wells in Yuanba gas field

LUO Wei1, LIN Yongmao1, DONG Haifeng1, XIONG Xindong1, ZHANG Zhicheng2   

  1. 1. Research Institute for Engineering Technology, Sinopec Southwest Branch Company, Deyang 618000, Sichuan, China;
    2. Exploration Division, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China
  • Received:2017-08-05 Revised:2017-10-16 Online:2018-03-21 Published:2018-03-21

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Abstract: For high Sulphur gas wells in Yuanba gas field that have a substantial increase in production, the annular pressure caused by thermal expansion effects is a kind of wellbore safety threats which cannot be ignored. Combined with the actual production situation, a wellbore temperature-pressure calculation model of gas-liquid twophase considering nonhydrocarbon correction and a prediction model of annular pressure caused by thermal expansion effects were firstly established. The normal annular pressure regularity was obtained through the example calculation and the sensitivity analysis of influencing parameters. Meanwhile, corresponding annular pressure control measures were put forward. The judgment chart of annular pressure types in the "A" annulus was established through a large number of simulation calculation with different gas production rate and water production rate. Then, the judgment chart was applied to the field, which realizes the annular pressure type judgment of three key wells in Yuanba gas field. The results show that to reduce the thermal expansion coefficient of annular fluid, to improve the isothermal compression coefficient of annular fluid and to improve the deformation coefficient of casing, are all the effective methods to control the annular pressure caused by thermal expansion effects. To reserve a part of the annular space at the beginning of production is also beneficial to reduce the annular pressure caused by thermal expansion effects.

Key words: profile control and water plugging, parameter optimization, reservoir adaptability, physical simulation, Bohai SZ36-1 oilfield

CLC Number: 

  • TE32
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