Study on the variation of rock pore structure after polymer gel flooding

Zhang, Dong; Wei, Jianguang; Fang, Xinren

doi:10.1515/epoly-2020-0004

Cited by 9 publications

(6 citation statements)

References 10 publications

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“…In a landslide monitoring operation, Zhang, D. and others fused high-precision laser scanning point cloud and slope radar results for data fusion. Although there is no detailed description of how to obtain higher interference phase quality, the most critical area is localization relative to work activities, and the displacement detected by GB in SAR is visualized in three dimensions by merging with the three-dimensional model [8].…”

Section: Literature Reviewmentioning

confidence: 99%

Slope Topography Monitoring Based on UAV Tilt Photography Technology and Sensor Technology

Cao

Dai

et al. 2022

Journal of Sensors

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In order to solve the problems of high risk and low efficiency of the traditional rock mass structure logging method of open-pit mine slope, this paper proposes a method to improve the geological logging of traditional open-pit mine slope by using UAV tilt photography technology. Taking the slope of an open-pit quarry as an example, this method expounds the application method and work flow of UAV photography technology in geological logging. The experimental results show that the maximum and minimum absolute errors in the X direction of UAV test are 5.1 cm and 1.1 cm, respectively; MAE value is 2.90 cm; and RMSE value is 3.17 cm. The maximum and minimum absolute errors in Y direction are 3.3 cm and 0.9CM, respectively; MAE value is 2.36 cm; and RMSE value is 2.498 cm. Vertical error refers to the error in elevation. The maximum and minimum absolute errors in Z direction are 9.6 cm and 5.7 cm, respectively; MAE value is 7.44 cm; and RMSE value is 7.54 cm. Conclusion. The reliability of this technology is verified by comparing the occurrence measured by compass and that calculated by point cloud. On this basis, the dominant occurrence of structural plane is divided, which provides basic data support for the analysis of mine slope stability.

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Section: Literature Reviewmentioning

confidence: 99%

Slope Topography Monitoring Based on UAV Tilt Photography Technology and Sensor Technology

Cao

Dai

et al. 2022

Journal of Sensors

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“…The prepared hydrogel base solution was injected into an ampule under atmospheric pressure and temperature, and the sealed ampule was placed in a constant temperature water bath at 50−90 °C to fully react, and the hydrogel gelation time and degradation time were measured by the gel strength code (GSC) method, which was used to measure the hydrogel formation time and degradation time. 19 In this study, the time for the hydrogel to reach grade E is defined as the gelation time, while the time for the hydrogel to reach grade C is defined as the degradation time.…”

Section: Performance Evaluation Of Hydrogels 2331 Determination Of Th...mentioning

confidence: 99%

Synthesis and Performance Study of Self-Degradable Gel Plugging Agents Suitable for Medium- and Low-Temperature Reservoirs

Zou,

Wang,

et al. 2024

ACS Omega

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Aiming at the problems of current similar hydrogel plugging agents, such as poor breaking performance, nonspontaneous degradation, and reservoir pollution which have been plaguing their application in temporary plugging operations, this study has synthesized a cross-linking agent for hydrogels with dimethylaminoethyl acrylate and dibromo-p-xylene as raw materials. With Fourier transform infrared, 1 H nuclear magnetic resonance, and thermogravimetric analyses as representations of the structure and thermal stability of the crosslinking agent, a set of self-degrading hydrogel systems has been developed with the cross-linking agent as the core so as to make evaluations on the temperature resistance, plugging performance, and core damage performance of the hydrogel and conduct a study on its gelation kinetics. The research results show that the cross-linking agent shows good thermal stability. When applied in the hydrogel system, the hydrogel has shown high temperature resistance, maintaining gel strength for 5−10 days at 50−90 °C, with viscosity after complete degradation lower than 10 mPa•s. The excellent bearing strength of the hydrogel system has led to a core damage rate below 5%. The study on gelation kinetics of the hydrogel system shows that, with the increase in the concentration of the cross-linking agent, the gelation time of the hydrogel system is shortened, with the reaction order between the cross-linker concentration and the gelation time at about 0.6 under the condition of 50−90 °C.

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“…The implementation of Alkaline/Surfactant/Polymer (ASP) flooding is aimed at simultaneously increasing the swept volume and improving the efficiency of oil washing. However, the combined impact of chemical interactions, on-site management difficulties, and the associated high expenses present obstacles to the advancement of ASP flooding beyond polymer flooding [9,10]. As a result, the exploration of a multifunctional single agent emerges as a promising avenue for enhancing oil recovery following polymer flooding.…”

Section: Introductionmentioning

confidence: 99%

Study on the Structure–Activity Relationship and Oil Displacement Characteristics of the Polysurfactant Agent

He,

Yuan,

Gan

et al. 2024

Polymers

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This study examines a versatile polymer known as polysurfactant, which is synthesized by co-polymerizing flexible acrylamide and sodium acrylate hydrocarbon chain. The polymer serves as a backbone and possesses active functional groups. Notably, the polysurfactant exhibits superior plugging and flooding abilities compared to conventional polymers. The primary objective of this paper is to investigate the properties and oil displacement characteristics of the polysurfactant through indoor physical simulation experiments. The results demonstrate that the multi-branched structure of the polysurfactant enhances its ability to associate, leading to the formation of a unique spatial network structure. The inclusion of multi-branched structures notably amplifies the association effect. The critical concentration for the association is estimated to be around 800 mg/L, at which juncture the polysurfactant exhibits a viscosity retention rate surpassing 90% subsequent to shearing. Furthermore, this spatial network structure exhibits self-recovery capabilities after experiencing shear failure and displaying strong viscosity and shear resistance. In addition, the concentration of the polysurfactant can control the hydrodynamic feature size, which shows its adaptability in regulation and oil-repelling functions at reservoir permeabilities ranging from 500 to 2000 × 10−3 μm2 with resistance coefficients ranging from 108 to 320. During the microscopic oil displacement process, the polysurfactant exerts a significant impact on mobility control, while the elastic pull clearly demonstrates a commendable viscoelastic oil displacement effect. The polysurfactant exhibits a specific degree of emulsification capability towards crude oil, leading to the emulsion exhibiting typical pseudoplastic fluid characteristics. The utilization of emulsification transportation and emulsification blockage contributes to the enhancement of oil recovery. As a result, the polysurfactant exhibits multifaceted capabilities, encompassing profile control, flooding, and plugging, owing to its unique structural characteristics. Through the implementation of a field test focused on flooding in the Daqing Oilfield, a significant enhancement in the recovery rate of 10.85% is observed, accompanied by a favorable input–output ratio of 1:3.86, thereby generating significant economic advantages.

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Study on the variation of rock pore structure after polymer gel flooding

Cited by 9 publications

References 10 publications

Slope Topography Monitoring Based on UAV Tilt Photography Technology and Sensor Technology

Slope Topography Monitoring Based on UAV Tilt Photography Technology and Sensor Technology

Synthesis and Performance Study of Self-Degradable Gel Plugging Agents Suitable for Medium- and Low-Temperature Reservoirs

Study on the Structure–Activity Relationship and Oil Displacement Characteristics of the Polysurfactant Agent

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