Field Application and Performance Evaluation of Polymer Microsphere Profile Control in Low Permeability Oil Reservoir

Jia, Yuqin; Yang, Haitao; Chi, Cheng; Li, Zhiping; Hou, Ganggang; Yuan, Xinyu; Zhao, Wenyue; Zhang, Zhen; Liu, Tongjing

doi:10.2118/197198-ms

Cited by 13 publications

(11 citation statements)

References 2 publications

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“…In this research process, two kinds of PMs are studied with the calibration diameter as 100 nm (PM100) and 800 nm (PM800) separately. These two kinds of microspheres have been applied in Changqing Oilfield with good performance . Also, according to the throat diameter and the particle size of these two kinds of PMs, the calculated matching coefficient is within the recommended matching coefficient range.…”

Section: Methodsmentioning

confidence: 90%

“…In this work, the resistance coefficient and blocking rate are calculated using eqs and . The retention rate of the PMs in the core is calculated using eq where F r is the resistance coefficient and η is the blocking rate; K w , K p , and K sw , respectively, represent the core permeability after WF, PMF, and SWF, μm 2 ; μW and μ P are the viscosity of water and the PM system, respectively, mPa·s; DPW and DPP represent the differential pressure of WF and PMF, respectively, MPa; Q w and Q p are the injection rate during WF and PMF, respectively, mL/min.…”

Section: Experimental Conditionmentioning

confidence: 99%

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Research on Optimal Blocking Limits and Injection Parameter Optimization of Polymer Microsphere Conformance Control

Zhao

Hou

et al. 2021

ACS Omega

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Polymer microsphere (PM) profile control has been attributed to improving sweep efficiency during the oil development process. The critical factors for PM conformance control are the plugging properties controlled by matching the relationship between the throat diameter and particle size and the injection parameters. A new matching relationship between the reservoir and PM based on the function of blocking rate and the ratio of throat diameter to microsphere diameter (C R) is established to choose the most appropriate PM size. The blocking rate indicates that it will get the most excellent plugging effect when C R is 0.5. The displacement experiments under different injection concentrations and other injection volumes show that the blocking rate is increased by injection concentration and finally stabilized. A similar trend is presented between the injection volume and plugging rate. The optimal injection concentration is 0.5%, and the optimal injection volume is 0.3 PV. According to the new size selection method and injection parameter optimal method, PM100 chooses to conduct field application. PM100 presents a good performance with a success rate of 37.5% and a validity period of more than 120 days, and its daily oil production rate increased 1.7 times, on average, and finally, the total oil increase is 556 t. The optimal size microsphere shows a good EOR effect, which indicates that this size selection method is reasonable.

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Section: Methodsmentioning

confidence: 90%

Section: Experimental Conditionmentioning

confidence: 99%

Research on Optimal Blocking Limits and Injection Parameter Optimization of Polymer Microsphere Conformance Control

Zhao

Hou

et al. 2021

ACS Omega

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“…Among its many application fields, oil development is one of the most important application fields ( Kawaguchi, 2000 ; Raffa et al, 2016 ; Jia et al, 2019 ) because it has many excellent properties, such as stability, rheology, and self-similarity ( Kang et al, 2015 ; Yang et al, 2017 ). Among them, oilfield researchers are most concerned with properties such as the PMs particle size and its distribution.…”

Section: Introductionmentioning

confidence: 99%

“…PMs have therefore become one of the most eye-catching research directions in functional polymer materials and related fields in recent years (Jia et al, 2018). Among its many application fields, oil development is one of the most important application fields (Kawaguchi, 2000;Raffa et al, 2016;Jia et al, 2019) because it has many excellent properties, such as stability, rheology, and self-similarity (Kang et al, 2015;. Among them, oilfield researchers are most concerned with properties such as the PMs particle size and its distribution.…”

Section: Introductionmentioning

confidence: 99%

Research on a Fractal Dimension Calculation Method for a Nano-Polymer Microspheres Dispersed System

et al. 2021

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Polymer microspheres (PMs) are a kind of self-similar volume expansion particle, and their fractal dimension varies with hydration swelling. However, there is no unique fractal dimension calculation method for their characteristics. A new model is established in this paper, which is particular to calculate the fractal dimension of PMs. We carried out swelling hydration experiments and scanning electron microscope (SEM) experiments to verify the new model. The new model and the box-counting model were used to calculate the fractal dimensions of PMs based on the hydration experiment results. Then, a comparison of the calculation results of the two methods was used to verify the validity of the model. Finally, according to the new model calculation results, the fractal dimension characteristics of PMs were analyzed. The research results indicate that the new model successfully correlates the cumulative probability of the PMs dispersed system with the fractal dimension and makes fractal dimension calculation of PMs more accurate and convenient. Based on the experiment results, the new model was used to calculate the fractal dimension of PMs and the box-counting model, and its findings were all 2.638 at initial state hydration and 2.739 and 2.741 at hydration time as of day 1. This result verifies the correctness of the new model. According to the hydration swelling experiments and the new model calculation results, the fractal dimension is linear correlated to the average particle size of PMs and the standard deviation average particle size. This means the fractal dimension of PMs represents the space occupancy ability and space occupancy effectiveness.

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“…After the near well is plugged, the subsequent injection water will flow around these areas and then return to the high-permeability channels (Zhou et al, 2017 ). A key component of the in-depth profile control technology of ultralow permeability oil reservoirs is to ensure that the agent can reach the deep part of the reservoir and effectively plug the high-permeability channels (Zhang and Zhou, 2008 ; Jia et al, 2019 ). However, this is impossible for most conventional profile control agents, as they usually cannot flow through the small pores and throat (Li et al, 1993 ; Tu and Wang, 2011 ).…”

Section: Introductionmentioning

confidence: 99%

Field Application of Nanoscale Polymer Microspheres for In-Depth Profile Control in the Ultralow Permeability Oil Reservoir

Hou

Zhao

Jia³

et al. 2020

Front. Chem.

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Much research has been carried out on nanoscale polymer microspheres (PMs) in laboratories in recent years. However, there are limited reports on the practical application of nanoscale PMs in ultralow permeability reservoirs. This paper reports a field application case of nanoscale PMs for in-depth profile control in the ultralow permeability oil reservoir. In the paper, the characteristics of the reservoir and the problems faced during development are analyzed in detail. Then, the PMs with calibration diameters of 300 nm and 800 nm are researched by evaluation experiments, and are selected for in-depth profile control in the ultralow permeability oil reservoir. Finally, according to the effect of the pilot application, the performance of PMs is evaluated, and a more suitable size for the pilot test reservoir is determined. The experiment's results show that the PMs have a good capacity for swelling and plugging. For the PMs with a calibration diameter of 300 nm, the final equilibrium swelling ratio is 56.2 nm·nm −1 , and the maximum resistance coefficient and the blocking rate after swelling are 3.7 and 70.31%, respectively. For the PMs with a calibration diameter of 800 nm, the final equilibrium swelling ratio is 49.4 nm·nm −1 , and the maximum resistance coefficient the blocking rate after swelling are 3.5 and 71.42%, respectively. The performance evaluation results show that nanoscale PMs can be used for in-depth profile control in the ultralow permeability oil reservoir. After the application of PMs in the pilot test area, the average water cut decreased by 10.4%, the average liquid production of single well-increased by 0.9 t/d, and the average thickness of the water-absorbing layer increased by 1.77 m. Comparing the dynamic data variation of well-groups using the PMs with the calibration diameter as 800 nm and the calibration diameter as 300 nm, it indicates that, for the pilot test area, PMs with a calibration diameter of 300 nm are more suitable than PMs with a calibration diameter of 800 nm.

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Field Application and Performance Evaluation of Polymer Microsphere Profile Control in Low Permeability Oil Reservoir

Cited by 13 publications

References 2 publications

Research on Optimal Blocking Limits and Injection Parameter Optimization of Polymer Microsphere Conformance Control

Research on Optimal Blocking Limits and Injection Parameter Optimization of Polymer Microsphere Conformance Control

Research on a Fractal Dimension Calculation Method for a Nano-Polymer Microspheres Dispersed System

Field Application of Nanoscale Polymer Microspheres for In-Depth Profile Control in the Ultralow Permeability Oil Reservoir

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