Research on matching mechanism between polymer microspheres with different storage modulus and pore throats in the reservoir

Yang, Hongbin; Kang, Wanli; Yin, Xia; Tang, Xuechen; Song, Shuyang; Lashari, Zeeshan Ali; Bai, Baojun; Sarsenbekuly, Bauyrzhan

doi:10.1016/j.powtec.2017.03.023

Cited by 65 publications

(27 citation statements)

References 11 publications

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“…e traditional polymeric microsphere, which is mainly made of gel, does not have an outer layer. Polymeric microspheres or the gel core is a viscoelastic plugging agent with 3D structure which can absorb much more water if compared to its own mass [35][36][37]. e core-shell microsphere has a core-shell double-layered structure.…”

Section: Core-shell Microsphere Expansion Analysesmentioning

confidence: 99%

Experimental Study on Expansion Characteristics of Core-Shell and Polymeric Microspheres

Diwu

Jiang

Hou

et al. 2018

Journal of Nanotechnology

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Traditional polymeric microsphere has several technical advantages in enhancing oil recovery. Nevertheless, its performance in some field application is unsatisfactory due to limited blockage strength. Since the last decade, novel core-shell microsphere has been developed as the next-generation profile control agent. To understand the expansion characteristic differences between these two types of microspheres, we conduct size measurement experiments on the polymeric and core-shell microspheres, respectively. The experimental results show two main differences between them. First, the core-shell microsphere exhibits a unimodal distribution, compared to multimodal distribution of the polymeric microsphere. Second, the average diameter of the core-shell microsphere increases faster than that of the polymeric microsphere in the early stage of swelling, that is, 0–3 days. These two main differences both result from the electrostatic attraction between core-shell microspheres with different hydration degrees. Based on the experimental results, the core-shell microsphere is suitable for injection in the early stage to block the near-wellbore zone, and the polymeric microsphere is suitable for subsequent injection to block the formation away from the well. A simple mathematical model is proposed for size evolution of the polymeric and core-shell microspheres.

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Section: Core-shell Microsphere Expansion Analysesmentioning

confidence: 99%

Experimental Study on Expansion Characteristics of Core-Shell and Polymeric Microspheres

Diwu

Jiang

Hou

et al. 2018

Journal of Nanotechnology

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“…Rigid microspheres with size well matching with pore‐throats can be more easily injected and entered deep into the formation, thus mitigating the contradiction between injectability of the profile control agent and its profile control ability. Yang 18 constructed the comprehensive correlation equation among stable injection pressure, matching factor and storage modulus. The specific comprehensive correlation equation p in = 3.3072 × 10 −7 G ′ 2.6492 R 2.3882 G ′ −0.0568 was derived according to the laboratory physical simulation data and the stable injection pressure of polymer microsphere with different storage modulus in different matching factors was predicted.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characteristics of self‐aggregation nanoparticles used for conformance control treatment

Shao

Yue

2020

Polymers for Advanced Techs

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In order to alleviate the contradiction between injectability of the profile control agent and its profile control performance, a novel core‐shell heterogeneous structure colloidal particles (CSA) were synthesized, and the mechanism of self‐aggregation plugging was proposed. Cross‐linking inside the nanoparticles and chain‐growth polymerization via capturing acrylamide in the aqueous phase result in the formation of core‐shell heterogeneous structures as proved by TEM observation and XPS analysis. Moreover, CSA nanoparticles exhibit good hydrophilic properties, outstanding thermal stability and limited expansion capacity. Effects of different metal cations and surface group on the self‐aggregation time of CSA nanoparticles were systematically studied. Results showed that divalent cations contributed to more significant aggregation of CSA nanoparticles in comparison to monovalent cations. The increasing cations concentration and valency decreased the thickness of electric double layer, which lead to a decrease in the zeta potential. Core flooding test shows that the injection of nanoparticles which diameter is much smaller that of pore‐throats into the target reservoir can not only successfully enter the depth of porous media, but also effectively block the high permeability areas by the formation of self‐aggregation particle clusters. This study provides a new method for the equilibrium between nanoparticles injectivity and in‐depth profile control of nanoparticles.

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“…If the stability is not good, the PMs will be absorbed in near the well-bore and plug the injection channel near the well-bore; thus, the purpose of in-deep profile control will not be achieved (Dai et al, 2017 ). In order to obtain PMs with better stability, many types of PMs have been developed (Hua et al, 2014 ; Mehta et al, 2015 ; Yang et al, 2017b ). All these polymer microsphere systems have shown excellent characteristics in laboratory evaluation studies.…”

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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Research on matching mechanism between polymer microspheres with different storage modulus and pore throats in the reservoir

Cited by 65 publications

References 11 publications

Experimental Study on Expansion Characteristics of Core-Shell and Polymeric Microspheres

Experimental Study on Expansion Characteristics of Core-Shell and Polymeric Microspheres

Fabrication and characteristics of self‐aggregation nanoparticles used for conformance control treatment

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

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