Method for screening surfactant in polymer/surfactant binary displacement of reservoir oil
A technique of surfactant and binary flooding, applied in surface tension analysis, surface/boundary effects, chemical instruments and methods, etc., can solve problems such as lack of system, inability to achieve good oil displacement effect, unbalanced weight, etc. , to achieve the effect of enhancing recovery
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Embodiment 1
[0087] The present embodiment provides a kind of screening method of surfactant in poly-surface binary flooding, and this method is mainly carried out for Xinjiang Oilfield, and it comprises the following steps:
[0088] 1) Prepare two different poly-surface binary flooding solutions, and their composition is shown in Table 1. The surfactant in Table 1 is produced by Jiangsu Haian Petrochemical Plant, and the polymer is produced by Beijing Hengju Chemical Group Co., Ltd. Production;
[0089] Table 1 Composition of poly-surface binary flooding solution
[0090]
Solution 1
Solution 2
Surfactant
SP-1207 (mass fraction is 0.3%)
ZHK-3 (mass fraction is 0.3%)
polymer
HPAM (concentration is 1200mg / L)
HPAM (concentration is 1200mg / L)
[0091] 2) Test the interfacial tension, wettability, emulsification performance, oil washing ability, thermal stability and adsorption stability of the two different poly-surface binary flooding s...
Embodiment 2
[0119] In this embodiment, a microscopic visual model is used to test the oil displacement effect of two different surfactants in Example 1, and the test steps are as follows:
[0120] 1) Microscopic visual model: use photolithography to copy the pore network on the thin slice of the core casting, and make a microscopic simulation through the steps of plate making, glue coating, photoimaging, chemical etching, sintering molding and wettability treatment Transparent pore model. The model size is 62mm×62mm×3.0mm, the effective size on the plane is 45mm×32mm, and the model pore diameter is 0.1-100μm. The model is a quarter of the five-point well pattern, and a small hole is drilled on the diagonal as the injection well and the production well;
[0121] 2) Take crude oil (858g / L) from Qizhong District of Xinjiang Karamay Oilfield and mix aviation kerosene to prepare simulated oil with a viscosity of 7.8mPa·s at room temperature; The composition of water is as shown in table 6; ...
Embodiment 3
[0133] In this embodiment, a flat visual model is used to test the oil displacement effect of two different surfactants in Example 1, and the test steps are as follows:
[0134] 1) Plane sand inclusion model:
[0135] ①Model material: It is made of two transparent glass plates cemented together;
[0136] ②Dimensions of the model experiment area (except the corner part): the thickness is about 2mm, and the length and width are 18cm×18cm;
[0137] ③Simulated oil layer: Fill quartz sand with different particle sizes to simulate oil layers with different permeability in the oil field;
[0138] ④ Simulate oil wells and water wells: drill holes on the model as injection and production ends;
[0139] ⑤ In order to avoid the influence of external tracer on the performance of the binary system and the oil-water interface, the color difference is used to investigate the extent of water flooding and binary flooding to increase the swept volume;
[0140] 2) Experimental operation steps: ...
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