A kind of compound oil displacement agent and its application
An oil displacement agent and oilfield technology, applied in the direction of production fluid, wellbore/well components, drilling composition, etc., can solve the problems of changing wettability, reducing interfacial tension, emulsifying and dispersing ability, and poor effect, etc. Achieve the effects of reducing viscosity, expanding steam coverage, good wetting reversal and viscosity reduction
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Embodiment 1
[0045] Preparation steps:
[0046] (1) At normal temperature and pressure, 2 parts of C 6 Alpha Olefin Sulfonate, 0.2 parts C 17 Fatty alcohol polyoxyethylene ether and 0.2 parts of C 10 Isomerized alcohol was added to the reactor and stirred for 1 hour;
[0047] (2) Add 22.5 parts of water into the reactor, stir for 0.5-1.5 hours, then add the remaining 22.5 parts of water to form an additive;
[0048] (3) Finally, add 3 parts of petroleum sulfonate S-5 into the reaction kettle, and mix well to obtain the finished oil displacement agent.
[0049] Performance Testing:
[0050] After the prepared oil displacement agent was treated at 300°C for 12 hours, the interfacial tension, wettability inversion performance and viscosity reduction performance were measured. The specific results are shown in Table 1-Table 3.
[0051] Table 1 Interfacial Tension Test Results (50°C)
[0052]
[0053] Table 2 Wetting reversal performance test results
[0054] Oil displacemen...
Embodiment 2
[0060] With embodiment 1, the difference is that,
[0061] (1) At normal temperature and pressure, 2 parts of C 9 Alpha Olefin Sulfonate, 0.2 parts C 19 Fatty alcohol polyoxyethylene ether and 0.2 parts of C 13 Isomerized alcohol was added to the reactor and stirred for 1 hour;
[0062] (2) Add 22.5 parts of water into the reactor, stir for 0.5-1.5 hours, then add the remaining 22.5 parts of water to form an additive;
[0063] (3) Finally, add 3 parts of petroleum sulfonate S-5 into the reaction kettle, and mix well to obtain the finished oil displacement agent.
[0064] The specific test results are shown in Table 4-Table 6.
[0065] Table 4 Interfacial Tension Test Results (50°C)
[0066]
[0067] Table 5 Wetting reversal performance test results
[0068] Oil displacement agent concentration%
[0069] 0.10
[0070] Table 6 Viscosity reduction performance test results (50°C)
[0071] Oil displacement agent concentration%
[0072] It can ...
Embodiment 3
[0074] With embodiment 1, difference is:
[0075] (1) At normal temperature and pressure, 18 parts of C 8 Alpha olefin sulfonate, 9 parts C 17 Fatty alcohol polyoxyethylene ether (C17-JFC) and 9 parts of C 12 Isomerized alcohol was added to the reactor and stirred for 1 hour;
[0076] (2) Add 46.8 parts of water into the reaction kettle, stir for 0.5-1.5 hours, then add the remaining 46.8 parts of water to form additives;
[0077] (3) Finally, add 20 parts of petroleum sulfonate S-5 into the reaction kettle, and mix well to obtain the finished oil displacement agent.
[0078] The specific test results are shown in Table 7-Table 9.
[0079] Table 7 Interfacial Tension Test Results (50°C)
[0080]
[0081] Table 8 Wetting reversal performance test results
[0082] Oil displacement agent concentration%
wettability index
0.00
-0.36
[0083] 0.05
-0.09
0.10
0.02
0.15
0.16
0.20
0.23
0.25
0.33
...
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