Technology of Polymer-Surfactant Flooding on High-Temperature, High-Salinity and High-Viscosity Reservoir

Abstract

Abstract:

According to the technical bottleneck problems of high-temperature, high-salt,middle-low permeability and heavy oil,which has become the constraints to enhance oil recovery, the lab and field experiment researches of polymer-surfactant flooding technology were carried out based on the oil formation of V in G109-1 reservoir after the polymer and surfactant systems were optimized. Through to the laboratory optimization,the association polymer AP-P7 and the surfactant BHS-01 system had better temperature-resistance and salt-resistance than the regular system, and this result extended the temperature and salinity scope of application; The association polymer could build the resistance coefficient and residual resistance factor effectively after the core shearing. According to the core displacement experiments,this system could enhance the heavy oil recovery factor,which extended the oil viscosity scope of application. After the well injection test in the field, the starting and the injecting pressure increased and the longitudinal profile-log monitoring was improved,which could demonstrate that this system could reduce the mobility ratio of oil to water obviously.

Key words: high-temperature, high-salinity and high-viscosity reservoir, association polymer, core shearing, core displacement experiment, well injection test

CLC Number:

TE357.46

ZHUANG Yongtao, LIU Pengcheng, HAO Mingqiang. Technology of Polymer-Surfactant Flooding on High-Temperature, High-Salinity and High-Viscosity Reservoir[J]. Geoscience, 2017, 31(04): 814-821.

Figures/Tables 14

Table 1 Results of water quality analysis

Table 2 Physical and chemical properties of polymers

聚合物型号	溶解性/h	固含量/%	水解度/%	分子量/10⁴	水不溶物/%
AP-P7	<2.0	88.7	17.9	12.0	0.13
AP-P3	<2.0	91.23	18.2	12.2	0.13
SNF	<2.0	88.59	27.5	25.2	0.124
HTPW-112	<2.0	88.24	26.9	25.9	0.135
KY-3	<2.0	89.37	22.2	25.5	0.114

Table 3 Physical and chemical properties of surfactants

表面活性剂	有效物含量/%	溶解性/%	pH	流动性
CEDA	60	>10	7.5	易于流动
BHS-01	50	>10	8.1	易于流动
BHS-CEDA	50	>10	8.7	易于流动

Fig.1 Experimental device of seepage characteristics

Fig.2 Experimental device of physical simulation

Fig.3 Viscosity increasing, temperature resistance and salt resistance of different polymers

Fig.4 Relationship between surface tension and viscosity of two solution and the concentration of surfactant

Fig.5 Interfacial tension and solution viscosity stability

Table 4 Viscosity changes of different types of polymers before and after shearing

聚合物	岩心渗透率/ 10^-3μm²	溶液浓度/ (mg/L)	剪切速率/ (m/d)	剪切前黏度/ (mPa·s)	剪切后黏度/ (mPa·s)	黏度保留率/%
AP-P7	240	2000	90	101.5	52	51.5
HTPW-112	240	2000	90	33.5	11.3	33.7

Fig.6 Injection pressure changes of polymer HTPW-112

Fig.7 Injection pressure changes of polymer AP-P7

Table 5 The rate of recovery under different driving modes

序号	驱油剂组成/(mg/L)		含油饱和度/%	采收率/%		采收率增幅/%
序号	聚合物	表面活性剂	含油饱和度/%	水驱	化学驱	采收率增幅/%
1	—	—	71.5	28	—	—
2	2 000	—	71.6	27.2	41.6	13.6
3	—	4 000	71.4	27.1	32.3	4.3
4	2 000	4 000	71.3	27	47.1	19.4

Fig.8 Rate of recovery under different oil viscosity

Fig.9 Curve of injection rate and oil pressure

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