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Enhanced Oil Recovery with the Assistance of Sealaplugology
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Enhanced Oil Recovery with the Assistance of Sealaplugology

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H: Geo-Energy".

Deadline for manuscript submissions: closed (13 July 2023) | Viewed by 5509

Special Issue Editors

Prof. Dr. Lihui Zheng

E-Mail Website
Guest Editor
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Interests: sealaplug in petroleum engineering; algorithm of big-data cocooning (ABDC); leakage prevention and plugging in oil and gas wells; reservoir damage control of unconventional oil and gas reservoirs
Special Issues, Collections and Topics in MDPI journals
Dr. Chengyuan Xu

E-Mail Website
Guest Editor
Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
Interests: formation damage; lost circulation control; granular matter mechanics
Dr. Xiujuan Tao

E-Mail Website
Guest Editor
College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710026, China
Interests: formation damage; chemical engineering; enhanced oil recovery; bonding and stabilizing material for broken formations
Guandong Su

E-Mail Website
Co-Guest Editor
Department of Civil and Environmental Engineering, National University of Singapore, Queenstown 119077, Singapore
Interests: energy-environment nexus; bioenergy; formation damage; environmental microbiology; petroleum engineering

Special Issue Information

Dear Colleagues,

Sealaplugology, including the associated theory and technology, has been rapidly developed during the last decade in various fields such as fireproof and waterproof in architecture, mechanical manufacturing, and energy exploitation. Especially, in the field of enhanced oil recovery, sealaplugology has already brought transformative advances with the development and exploitation of unconventional oil and gas such as coalbed methane, tight sandstone gas, shale gas, etc. Meanwhile, novel types of sealing materials and plugging agents, as well as the associated application technologies also represent a branch of the advancement of sealaplugology.

Aiming to present and disseminate the most recent advances of enhanced oil recovery technology driven by sealaplugology, this Special Issue is inviting the contribution of innovative studies (including both review and research papers) that report the theories, methods, technologies, materials, and case studies related to enhanced oil recovery and production with sealaplugology.

Topics of interest for this publication include, but are not limited to:

  • All aspects of petroleum engineering related to sealaplugology, including drilling, well completion, production, workover, etc.
  • All interdisciplinary research regarding sealaplugology, artificial intelligence, big data, and enhanced oil recovery.
  • The development and application of novel types of sealing agents or materials for enhanced oil recovery, oil and gas well engineering, etc.
  • Extraction technologies (hydraulic fracturing, diverting fracturing, in situ extraction, etc.) of unconventional oil and gas.
  • Safety, reliability, and eco-friendliness in enhanced oil recovery.

Prof. Dr. Lihui Zheng
Dr. Chengyuan Xu
Dr. Xiujuan Tao
Guandong Su
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • sealaplugology
  • enhanced oil recovery
  • drilling fluid
  • sealing agent
  • unconventional oil and gas

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Published Papers (5 papers)

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Research

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13 pages, 2744 KiB  
Article
Plugging Efficiency in Fractured Carbonate Gas Reservoirs Using Fuzzy-Ball Fluids Combined with Solid Plugging Agents
by Fanghui Zhu, Lihui Zheng, Yang Zhao, Qifan Chang, Jiahui Li and Qinhao Zhang
Energies 2023, 16(18), 6688; https://doi.org/10.3390/en16186688 - 18 Sep 2023
Cited by 1 | Viewed by 877
Abstract
Loss encountered during workover operation is a common challenge in the development of fractured carbonate gas reservoirs. Fuzzy-ball fluid, a non-solid phase plugging material developed based on Fuzzy Sealaplugging Theory, has been widely used in killing the well. However, in the plugging of [...] Read more.
Loss encountered during workover operation is a common challenge in the development of fractured carbonate gas reservoirs. Fuzzy-ball fluid, a non-solid phase plugging material developed based on Fuzzy Sealaplugging Theory, has been widely used in killing the well. However, in the plugging of fractured carbonate gas reservoirs, a substantial volume of Fuzzy-ball fluid is required and the pressurization process is time-consuming, which greatly impairs its application. In this study, solid plugging agents including calcium carbonate and fibers are introduced into Fuzzy-ball fluids to improve the plugging efficiency of large-scale macro-fractures. In particular, the plugging performance was evaluated by the indoor plugging of a synthetic core containing a 5 mm wide wedge-shaped fracture, as well as by field trials in two wells. The results show that the plugging ability of the new fluid increases as the concentration of calcium carbonate or fiber increases. Moreover, a more significant enhancement of plugging efficiency was achieved by fibers. In field applications, the use of Fuzzy-ball fluids with calcium carbonate or fibers reduced the volume of fluid consumed by 33~74% and decreased the pressurization time by 33~69%. Therefore, by combining solid plugging agents with Fuzzy-ball fluids, the dual demand for plugging efficiency and cost-effectiveness for fractured carbonate gas reservoirs is achieved simultaneously, which provides an alternative technique for addressing fluid loss in fractured carbonate gas reservoirs. Full article
(This article belongs to the Special Issue Enhanced Oil Recovery with the Assistance of Sealaplugology)
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12 pages, 1531 KiB  
Article
Acid-Soluble Drilling Fluid in the Northern Carbonate Reservoir of the Yishan Slope in the Ordos Basin
by Xiaolin Zhang, Binhua Dang, Xuecheng Wang, Shun Luo, Bugao Chen and Lihui Zheng
Energies 2023, 16(16), 6020; https://doi.org/10.3390/en16166020 - 17 Aug 2023
Cited by 1 | Viewed by 907
Abstract
The carbonate reservoir in the northern Yishan slope of the Ordos Basin presents significant challenges to gas field exploration and development. With its low pressure, limited porosity, low permeability, and abundance of micro-fractures, the reservoir is resistant to acid dissolution. Once solid particles [...] Read more.
The carbonate reservoir in the northern Yishan slope of the Ordos Basin presents significant challenges to gas field exploration and development. With its low pressure, limited porosity, low permeability, and abundance of micro-fractures, the reservoir is resistant to acid dissolution. Once solid particles block these fractures during drilling and completion, serious reservoir damage ensues. To address these obstacles, we engineered an acid-soluble, solid-free drilling fluid system in the lab. This involved incorporating sodium carboxymethyl cellulose, heat-resistant starch, fungicides, and lubricants. Contrasted with the commonly used potassium ammonium based drilling fluid system, our innovative solution showed notable improvements. Specifically, the density decreased by 0.04 to 0.06 g/cm3, and the solid content decreased by 4.0% to 6.50%, while the acid-soluble rate surged from 8.50% to 95.45%. In addition, the reservoir permeability recovery value saw an increase from 51.50% to 95.88%. In practical field application, we employed this novel drilling fluid system in ten horizontal wells. Following acid fracturing and reconstruction, these wells registered a 75.94% increase in gas production compared to nearby wells. Our findings demonstrate that the proposed system effectively mitigates the incursion of solid-phase particles into the reservoir while enhancing acidification during acid fracturing. This results in the swift removal of plugging, restoration of formation permeability, and improved well production. Our research thus introduces a drilling and completion fluid system of high efficiency with superior reservoir protection performance, potentially offering substantial benefits to the development of carbonate rock salt gas reservoirs. Full article
(This article belongs to the Special Issue Enhanced Oil Recovery with the Assistance of Sealaplugology)
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13 pages, 12102 KiB  
Article
Synthesis and Performance Evaluation of Graphene-Based Comb Polymer Viscosity Reducer
by Zhengdong Xu, Mingjie Li, Yidan Kong, Changjun Long, Yankun Sun, Guohua Liu, Chunhui Yu, Yi Lu, Junpu An and Fan Yang
Energies 2023, 16(15), 5779; https://doi.org/10.3390/en16155779 - 3 Aug 2023
Cited by 2 | Viewed by 1019
Abstract
The high viscosity of heavy oil makes it difficult to realize its economic value. Therefore, improving the fluidity of heavy oil can effectively improve the economic benefit of the development of heavy oil resources. Oil-soluble viscosity reducers can utilize functional groups in monomers [...] Read more.
The high viscosity of heavy oil makes it difficult to realize its economic value. Therefore, improving the fluidity of heavy oil can effectively improve the economic benefit of the development of heavy oil resources. Oil-soluble viscosity reducers can utilize functional groups in monomers to break up asphaltene aggregates to improve the flow of crude oil. Graphene can be used to insert and split asphaltene aggregates through sliding phenomena and π–π interaction with colloidal asphaltene, thereby improving the fluidity of heavy oil. In this study, a graphene nanocomposite viscosity reducer was synthesized from lipophilic-modified graphene and a polymer viscosity reducer. The net viscosity reduction rate reached 80.0% at 400 ppm. Compared with a polymer viscosity reducer, the viscosity reduction effect of a graphene nanocomposite viscosity reducer was improved by about 7%. Structural characterization of a graphene nanocomposite viscosity reducer was characterized with infrared spectroscopy and a thermogravimetric test. The mechanism of a graphene nanocomposite viscosity reducer splitting asphaltene aggregates was verified with scanning electron microscopy. This study provides a theoretical and practical basis for the research and development of a novel nanocomposite viscosity reducer. Full article
(This article belongs to the Special Issue Enhanced Oil Recovery with the Assistance of Sealaplugology)
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16 pages, 3389 KiB  
Article
Unveiling the Feasibility of Coalbed Methane Production Adjustment in Area L through Native Data Reproduction Technology: A Study
by Qifan Chang, Likun Fan, Lihui Zheng, Xumin Yang, Yun Fu, Zixuan Kan and Xiaoqing Pan
Energies 2023, 16(15), 5709; https://doi.org/10.3390/en16155709 - 31 Jul 2023
Cited by 1 | Viewed by 895
Abstract
In the L Area, big data techniques are employed to manage the principal controlling factors of coalbed methane (CBM) production, thereby regulating single-well output. Nonetheless, conventional data cleansing and the use of arbitrary thresholds may result in an overemphasis on certain controlling factors, [...] Read more.
In the L Area, big data techniques are employed to manage the principal controlling factors of coalbed methane (CBM) production, thereby regulating single-well output. Nonetheless, conventional data cleansing and the use of arbitrary thresholds may result in an overemphasis on certain controlling factors, compromising the design and feasibility of optimization schemes. This study introduces a novel approach that leverages raw data without data cleaning and eschews artificial threshold setting for controlling factor identification. The methodology supplements previously overlooked controlling factors, proposing a more pragmatic CBM production adjustment scheme. In addition to the initial five controlling factors, this approach incorporates three additional ones, namely, dynamic fluid level state, drainage velocity, and fracturing displacement. This study presents a practical application case study of the proposed approach, demonstrating its ability to reduce reservoir damage during the coal fracturing process and enhance output through seal adjustments. Utilizing the full spectrum of original data and minimizing human intervention thresholds enriches the information available for model training, thereby facilitating the development of a more efficacious model. Full article
(This article belongs to the Special Issue Enhanced Oil Recovery with the Assistance of Sealaplugology)
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Review

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14 pages, 7309 KiB  
Review
Fuzzy-Ball Fluids Enhance the Production of Oil and Gas Wells: A Historical Review
by Xiaoyong Li, Lihui Zheng, Yuanbo Chen, Xiaowei Huang, Xiaopeng Zhai, Panfeng Wei, Xiujuan Tao and Shuaishuai Nie
Energies 2023, 16(18), 6647; https://doi.org/10.3390/en16186647 - 15 Sep 2023
Cited by 1 | Viewed by 956
Abstract
Advancements in drilling technology are pivotal to optimizing the production and sustainability of oil and gas wells. One of the emerging innovations is the application of a specialized fluid known as “Fuzzy-ball” fluid. This paper comprehensively reviews the historical evolution and advancements in [...] Read more.
Advancements in drilling technology are pivotal to optimizing the production and sustainability of oil and gas wells. One of the emerging innovations is the application of a specialized fluid known as “Fuzzy-ball” fluid. This paper comprehensively reviews the historical evolution and advancements in the utilization of fuzzy-ball fluid in drilling and well-repair processes. Fuzzy-ball fluid has been discovered to bolster a formation’s pressure-bearing capabilities and systematically augment resistance against oil, gas, and water flow. These attributes have been instrumental in the phased integration of fuzzy-ball fluid into procedures aiming to enhance production in oil and gas wells. This paper bridges the knowledge gap in the industry regarding the application of fuzzy-ball fluid, thereby circumventing the challenges of inadequate understanding and suboptimal designs. However, the study acknowledges the potential limitation of information loss despite the extensive data collection from diverse sources, such as articles, patents, and reports. As a future direction, this paper emphasizes the need for a more encompassing and critical evaluation of fuzzy-ball fluid’s performance and applications. This will enable a more informed decision-making process, fostering the expanded use and understanding of this fluid’s mechanism within the industry. Full article
(This article belongs to the Special Issue Enhanced Oil Recovery with the Assistance of Sealaplugology)
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