ﺗﺠﺰﻳﻪ و ﺗﺤﻠﻴﻞ ﻫﺎی ﻣﻨﺘﺸﺮ ﺷﺪه از آزﻣﺎﻳﺸﺎت ﭼﺎهی در ﻣﺨﺎزن ﮔﺎز ﻣﻴﻌﺎنی ،ﻫﻨﮕﺎمی ﻛﻪ ﻓﺸﺎر ﺑﻪ زﻳﺮ ﻧﻘﻄﻪ ﺷﺒﻨﻢ ﺳﻘﻮط می ﻛﻨﺪ ﻣﻌﻤﻮﻻً ﺑﺮ اﺛﺮ ﻣﺪل ﺷﻌﺎعی ﺷﺎﻣﻞ دو ﻧﺎﺣﻴﻪ می ﺑﺎﺷﻨﺪ و ﻣﻨﺎﻃﻖ ﺣﺬف ﻣﻴﻌﺎنی اﻃﺮاف دﻫﺎﻧﻪ ﭼﺎه و ﺗﺮﻛﻴﺐ اوﻟﻴﻪ ﮔﺎز دور از ﭼﺎه را ﻧﺸﺎن می دﻫﺪ. آزﻣﺎﻳﺶ ﻫﺎ از ﻃﺮف دﻳﮕﺮ اﺷﺎره می ﻛﻨﻨﺪ ﻛﻪ ﺳﻪ ﻣﻨﻄﻘﻪ ﺗﺤﺮیک ﭘﺬﻳﺮ وﺟﻮد دارد:
- یک ﻣﻨﻄﻘﻪ ﺑﻴﺮونی دور از ﭼﺎه ﺑﺎ اﺷﺒﺎع ﻣﻴﻌﺎنی ﻣﺎﻳﻊ اوﻟﻴﻪ
- ﻧﺎﺣﻴﻪ ای ﻧﺰدیک ﺑﻪ ﭼﺎه ﺑﺎ اﺷﺒﺎع ﻣﻴﻌﺎنی اﻓﺰاﻳﺶ ﻳﺎﻓﺘﻪ و ﺗﺤﺮیک ﭘﺬﻳﺮی ﮔﺎز ﻛﻢ
- ﻣﻨﻄﻘﻪ ای ﺑﺎ ﻓﺎﺻﻠﻪ ﻛﻢ در ﻧﺰدیکی ﭼﺎه ﺑﺎ ﻋﺪد ﻣﻮئینگی ﺑﺎﻻ ﻛﻪ ﻧﻔﻮذﭘﺬﻳﺮی نسبی ﮔﺎز را اﻓﺰاﻳﺶ می دﻫﺪ و ﻣﻨﺠﺮ ﺑﻪ ﺑﺎزﻳﺎبی ﻣﻘﺪار ﺑﻴﺸﺘﺮی از ﺗﺤﺮک ﮔﺎز از دﺳﺖ رﻓﺘﻪ از ﻣﻤﺎﻧﻌﺖ ﺳﻴﺴﺘﻢ ﻧﻔﺖ ﻣﻴﻌﺎنی می ﺷﻮد.
اﻳﻦ ﻣﺒﺤﺚ وﺟﻮد اﻳﻦ ﻧﻮاحی را در داده ﻫﺎی آزﻣﺎیشی ﭼﺎه ﻣﻮرد ﺑﺮرسی ﻗﺮار می دﻫﺪ .ﻣﺜﺎلی از ﺗﺠﺰﻳﻪ و ﺗﺤﻠﻴﻞ آزﻣﺎﻳﺸﺎت ﭼﺎه ﻣﻮرد ﺑﺤﺚ و ﺑﺮرسی ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ ﻛﻪ دﺷﻮاری ﺷﻨﺎﺳﺎیی ﭼﻨﻴﻦ ﻣﻨﻄﻘﻪ ای را ﻧﺸﺎن می دﻫﺪ. در ﺑﺴﻴﺎری از ﻣﻮارد داده ﻫﺎی ارﺗﻔﺎع اﻓﺖ آب در ﭼﺎه ﻫﺎ و ﻳﺎ ﺑﺎﻻ ﺑﺮدن ﺗﻮﺳﻂ اﺛﺮات ﺗﻮزﻳﻊ ﻣﺠﺪد ﻓﺎز دﻫﺎﻧﻪ ﭼﺎه ﻏﺎﻟﺐ ﺷﺪه اﻧﺪ .در ﻫﺮ ﺟﺎیی ﻛﻪ ﻫﺮ ﺳﻪ ﻧﺎﺣﻴﻪ ﻗﺎﺑﻞ ﺷﻨﺎﺳﺎیی ﺑﺎﺷﻨﺪ داده ﻫﺎ ﺑﺎ اﺳﺘﻔﺎده از یک ﻣﺪل ﺷﻌﺎعی ﻣﺘﺸﻜﻞ از ﺳﻪ ﻧﺎﺣﻴﻪ ،ﻣﻮرد ﺗﺠﺰﻳﻪ و ﺗﺤﻠﻴﻞ ﻗﺮار ﮔﺮﻓﺘﻪ اﻧﺪ و وﻳﮋگی ﻛﺎملی را از اﺛﺮات ﻧﺰدیک دﻫﺎﻧﻪ ﭼﺎه اراﺋﻪ می ﻛﻨﺪ و ﺑﻪ وﻳﮋه داﻧﺶ ﺗﺮﻛﻴﺒﺎت ﻣﺨﺘﻠﻒ ﺗﺄﻳﻴﺪ کلی ﭘﻮﺳﺘﻪ :ﭘﻮﺳﺘﻪ ﻣﻜﺎنیکی ،ﻣﻘﺪار واﺑﺴﺘﻪ ﺑﻪ دو ﻓﺎز و ﭘﻮﺳﺘﻪ ای ﺑﻪ ﻣﻤﺎﻧﻌﺖ ﮔﺎز ﻣﻴﻌﺎنی .وﺟﻮد اﻳﻦ ﺳﻪ ﻣﻨﻄﻘﻪ و ﻧﺘﺎﻳﺞ ﺗﺤﻠﻴﻞ ﻫﺎ ﺑﺎ یک ﺷﺒﻴﻪ ﺳﺎز ﻣﺮﻛﺐ ﺗﺄﻳﻴﺪ ﺷﺪه اﻧﺪ ،در ﺟﺎیی ﻛﻪ ﻧﻔﻮذﭘﺬﻳﺮی ﻧﻴﺰ ﺑﻪ درﺟﻪ ﻣﻮئینگی بستگی دارد.
کلمات کلیدی: اﺷﺒﺎع ﻣﻴﻌﺎنی، ﻧﻘﻄﻪ ﺷﺒﻨﻢ، ﻣﺨﺎزن ﮔﺎز ﻣﻴﻌﺎنی، ﭼﺎه آزﻣﺎیی
Well Test Analysis In Gas-Condensate Reservoirs
Published analyses of well tests in gas-condensate reservoirs when pressure drops below the dew point are usually based on a two-zone radial composite model, representing regions of condensate drop-out around the wellbore and of initial gas composition away from the well. Laboratory experiments, on the other hand, suggest that three different mobility zones could exist:
- an outer zone away from the well, with the initial liquid condensate saturation;
- a zone nearer to the well, with increased condensate saturation and lower gas mobility; and
- a zone in the immediate vicinity of the well with high capillary number which increases the gas relative permeability, resulting in a recovery of much of the gas mobility lost from condensate blockage.
This paper investigates the existence of this latter zone in well test data. An example of well test analysis is discussed, which illustrates the difficulty of identifying such a zone as, in many cases, build-up and/or drawdown data are dominated by wellbore phase redistribution effects. Where the three zones can be identified, data are analyzed using a three-zone radial composite model to yield a complete characterization of the near-wellbore effects and in particular the knowledge of the various components of the total skin effect: mechanical skin; rate-dependent two-phase skin; and skin due to gas condensate blockage. The existence of the three zones and the results of the analysis are verified with a compositional simulator where relative permeability depends on capillary number.
keyword: Well Test, Gas-Condensate Reservoirs, Dew Point, Condensate Saturation
- ترجمه فارسی مقاله انگلیسی
Well Test Analysis In Gas-Condensate Reservoirs
Journal: Society of Petroleum Engineers (SPE 62920)
- دانلود رایگان فایل pdf مقاله انگلیسی در 9 صفحه
- فایل pdf ترجمه فارسی در 23 صفحه
