姬塬油田耐温抗盐表面活性剂增注体系研究

doi:10.3969/j.issn.1001-1803.2022.10.002

Abstract

Abstract:

The enhancement of oil recovery efficiency by water flooding has been restricted by the harsh conditions of the reservoirs （medium temperature, high salinity and low permeability） in Jiyuan Oilfield. Herein, a new type of anionic-nonionic surfactant, fatty alcohol ether sulfonate （DES）, was synthesized and compounded with an oleate amide betaine surfactant （HGC） that was derived from oleic acid. Thus, a flooding agent containing DES/HGC that could withstand high temperature and salinity was developed and systematically evaluated. The results confirmed the well temperature- and salt-resistance of the flooding agent. At a temperature range of 100-110 ℃ and salinity of 65.5 g/L, an ultra-low interfacial tension （~10^-3 mN/m） between the oil and the surfactant solution was obtained. At 75 ℃, an interfacial tension of ~10^-3 mN/m could also be reached when the salinity was above 120 g/L. The ultra-low interfacial tension level could still be maintained after being aged at 110 ℃ for 30 days; the dynamic adsorption of the system was weak, indicating that the adsorption loss of the surfactants in the formation was small; when 0.2 PV and 0.6 PV of flooding agent were injected into the core samples, the pressure of water flooding could be decreased by 18.39% and 30.54%, respectively. The field tests showed that the injection pressure of the water injection could be decreased by 3.0 MPa, and the cumulative injection of a single well was increased by 11 780 m³, indicative of remarkable effects of pressure reduction and injection increase.

Key words: water injection well, surfactant, low permeability reservoir, depressurization and augmented injection

CLC Number:

TQ423

Lu Xiaobing,Zheng Yancheng,Liu Xiaoning,Wang Wei,Lan Lefang. Research and application of a temperature-resistant and salt-resistant surfactant injection system for Jiyuan Oilfield[J].China Surfactant Detergent & Cosmetics, 2022, 52(10): 1040-1048.

Figures/Tables 8

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References 24

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Surfactant dosage/%	Weight/g	Length/cm	Diameter/cm	Permeability/mD	Pore volume（PV）/mL	Saturated adsorption capacity/（mg/g）	Surfactant remained in each core /（mg/g）
0.1	80.36	7.99	2.45	0.38	7.67	2.3	0.8
0.3	79.23	7.86	2.45	0.59	8.42	2.5	0.7
0.5	81.35	7.63	2.45	0.81	7.64	2.5	1.2

Core No.	Porosity/%	Permeability/mD	Water injection pressure/MPa	Injection volume of surfactant solution/PV	Water injection pressure /MPa	Depressurization rate/%
1	10.6	0.85	4.35	0.2	3.55	18.39
2	10.5	0.74	4.68	0.4	3.55	24.15
3	10.3	0.68	4.65	0.6	3.23	30.54
4	10.4	0.72	4.73	0.8	3.25	31.29

Physical properties of Chang-2 reservoir	Porosity/%	10.4
Physical properties of Chang-2 reservoir	Permeability/mD	0.85
Water flooding before DES/HGC injection	Equilibrium injection pressure/MPa	21.5
	Water injection volume/m³	11
	Apparent water absorption index m³/ （d·MPa^-1）	1.037
Water flooding after DES/HGC injection	Equilibrium injection pressure/MPa	18.5
	Water injection volume/m³	20
	Apparent water absorption index m³/ （d·MPa^-1）	3.111
The cumulative injection volume of water/m³		11 780
Depressurization rate/%		13.95

Research and application of a temperature-resistant and salt-resistant surfactant injection system for Jiyuan Oilfield

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