Method and system for treating hydrocarbon formations
A formation and treatment composition technology, applied in the direction of chemical instruments and methods, drilling composition, etc., can solve the problems of expensive, time-consuming reprocessing, relatively short life, etc.
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Embodiment 1
[0141] The nonionic fluorinated polymeric surfactant ("Nonionic fluorinated polymeric surfactant A") was prepared essentially as in Example 4 in U.S. Patent No. 6,664,354 (Savu), except that 15.6 grams (g) of 50 / 50 mineral spirits / organic peroxide initiator (tert-butylperoxy-2-hexanoic acid ethyl ester, available from Akzo Nobel, Arnhem, Netherlands, trade name "TRIGONOX-21-C50") instead of 2,2' - Azobisisobutyronitrile and 9.9 g of 1-methyl-2-pyrrolidone are added to the charge.
[0142] Cores with the specified dimensions below are cut from raw rock blocks. The cores were dried in an oven at 100°C for 24 hours and then weighed. The core was then wrapped with polytetrafluoroethylene (PTFE), aluminum foil and shrink wrapped with heat shrink tubing (obtained from Zeus, Inc., Orangeburg, SC under the trade designation "TEFLON HEATSHRINK TUBING"). Place the wrapped core in a core holder inside an oven at the experimental temperature.
[0143] Preflush with preflush fluid prio...
Embodiment 2
[0161] This operation uses a fluid preflush prior to processing a low permeability gas condensate sandstone formation with a high salinity brine (22.8% NaCl and 1.5% CaCl brine). This operation was performed at a reservoir temperature of 279°F (137.2°C) on sandstone reservoir core plugs having the properties described in Table 7 (below). Table 7 (below) summarizes core properties and operating conditions.
[0162] Table 7
[0163] core
sandstone
Length, inches (cm)
1.9
Diameter, inches (cm)
1(2.54)
Porosity,%
13
Pore volume, cc
3.17
Swi,%
15
Temperature, °F(°C)
279(137.2)
k, md
7.3
Kg(Swi)
6.9
[0164] Core preparation. The cores were dried in an oven at 100°C for 24 hours and then weighed. The core is then wrapped with polytetrafluoroethylene (PTFE), aluminum foil and shrink-wrapped with "TEFLON heat-shrinkable tubing". The wrapped core was placed...
Embodiment 3
[0180] This example illustrates the benefit of using a solvent preflush prior to treating a gas condensate sandstone formation containing incipient water. This example was performed using a Bere sandstone core at a reservoir temperature of 275°F (135°C).
[0181] Cores having the following specific dimensions were cut from raw rock blocks. The cores were dried in an oven at 100°C for 24 hours and then weighed. The core is then wrapped with polytetrafluoroethylene (PTFE), aluminum foil and shrink-wrapped with "TEFLON heat-shrinkable tubing". The wrapped core was placed in a core holder in an oven at 275°F (135°C).
[0182] Initial gas permeability was measured with nitrogen at 75°F (23.8°C). An initial brine saturation of 26% was created by injecting a measured volume of brine into the vacuum core. Relative gas permeability at initial water saturation is measured with nitrogen at 75°F (23.8°C). Table 13 (below) summarizes core properties and operating conditions.
[0183]...
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