Elemental Sulfur Deposited in Acid fractured Carbonate Sour Gas Wells
Received date: 2007-11-01
Revised date: 2008-04-02
Online published: 2008-06-10
It’s a common phenomenon that elemental sulfur deposits in formations, which not only brings serious damages to production equipment, but also easily plugs permeability channels. This is one of key factors that affect the safe and effective development of sour gas reservoirs. Because of modeling on just static environments and neglecting the behavior of gas current hydrodynamic force to elemental sulfur particles, the results predicted by many models had great errors compared to the actual data. This paper presents a new theory model which considers the effects of gas current hydrodynamic force on elemental sulfur particles transporting. Research shows that: (1) gas velocity is a factor that must be considered while modeling; (2) elemental sulfur occurred mainly in a relatively small region close to the well bottom and the fractures; (3) the quantity and settling rate of elemental sulfur deposition decrease progressively along the well bottom to the fractures; (4) regardless of elemental sulfur deposited in the matrix or the fractures, the setting rate increases with production time.
Key words： Carbonate rock; Sour gas; Sulfur deposition; Acid fracturing; Base rock; Fracture; Plugging.
ZENG Ping;CEN Fang . Elemental Sulfur Deposited in Acid fractured Carbonate Sour Gas Wells [J]. Natural Gas Geoscience, 2008 , 19(3) : 414 -418 . DOI: 10.11764/j.issn.1672-1926.2008.03.414
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