Theoretical study on profile control of a nano-microparticle dispersion system based on fracture–matrix dual media by a low-permeability reservoir

The problem of injected water channeling along fractures exists in the process of water injection in fractured low permeability reservoir, aimed at this problem, deep profile control technology applies to plug fractures to improve the recovery of low permeability reservoir. In this paper, partially hydrolyzed polyacrylamide (HPAM) is used as water-plugging/profile-modifying agent and phenolic resin as crosslinker agent. Several profile control systems are tested to find the one which is suitable for fractured low permeability reservoirs. The performances of profile control systems are evaluated, and effects of formation water salinity, that of shearing rate and that of temperature on the performance are studied. Finally, in order to study effects of this profile control system on displacing oil, flowability experiment and core displacement experiment are applied. It shows that with the increase of salinty of prepared water and the increase of the shearing rate, the viscosity of this system decreases. With the increase of temperature, the gelling time shortens, the viscosity increases, but the stability weekens. This kind of profile control system has a good effect on plugging fractures of low permeability cores. After water flooding, this kind of profile control system is injected into cores, the recovery ratio can increase 3.5%. So the profile control system composed of HPAM/ phenolic resin can apply to deep profile control in fractured low permeability reservoir to enhance oil recovery.

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Research on New Polymer Microsphere Gel for In-Depth Profile Control and Its Application in Low Permeability Reservoir

Springer Series in Geomechanics and Geoengineering - Proceedings of the International Field Exploration and Development Conference 2020 ◽

10.1007/978-981-16-0761-5_282 ◽

2021 ◽

pp. 3017-3026

Author(s):

Tianjiang Wu ◽

Yanhong Zhao ◽

Zhaojie Song ◽

Yajun Sun

Keyword(s):

Depth Profile ◽

Low Permeability ◽

Polymer Microsphere ◽

Low Permeability Reservoir ◽

Profile Control

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Injection Method of SJT-B Collosol in the Low Permeability Reservoir

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.694.340 ◽

2014 ◽

Vol 694 ◽

pp. 340-345

Author(s):

Ke Liang Wang ◽

Jin Yu Li ◽

Lei Lei Zhang ◽

Xue Li ◽

Guo Qiang Fu ◽

...

Keyword(s):

Oil Recovery ◽

Normal Pressure ◽

Water Flooding ◽

Low Permeability ◽

Injection Method ◽

Low Permeability Reservoir ◽

Medium Permeability ◽

Profile Control ◽

Long Time ◽

Core Permeability

Profile control and flooding technique is an effective way to enhance the oil recovery of low permeability reservoir.Analyzing the relation between oil and water interface and determining injection volume under different concentration is the key to success in profile controlling and flooding in low permeability reservoir .The research is about SJT-B collosol of physicochemical property under normal pressure and temperature.We also carry on the study on measuring SJT-B collosol interfacial tension for a long time under different concentration.Besides, we conduct the plugging degree experiment by injecting SJT-B collosol with the concentration of 0.8% in different permeability core.The lower the core permeability, the higher the plugging degree. By optimizing the injection pattern we conduct the three-tube parallel profile control and flooding experiment in the low permeability heterogeneous core.It indicates that SJT-B collosol mainly access to high permeability layer and have an effective plugging effect .The absorbed liquid rate of medium permeability layer is increased apparently ,while low permeability layer is increased slightly.The SJT-B collosol of injection method has efficient effect on enhancing the oil recovery of low permeability reservoir in late water flooding.

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