Zhiyu Zhao

Sichuan University

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Heping Xie

Sichuan University

Tao Liu

Yan'an University

Yifan Wu

Wuhan Institute of Technology

Dongsheng Yang

Shenzhen University

Wenchuan Jiang

Sichuan University

Cheng Lan

Sichuan University

Liangyu Zhu

Shenzhen University

Yunpeng Wang

Sichuan University

Jianping Yang

Institute of Rock and Soil Mechanics

Ling Chen

Sichuan University

Cooperative Institutions

Sichuan University

Shenzhen University

Chinese Academy of Sciences

State Key Laboratory of Hydraulics and Mountain River Engineering

China University of Mining and Technology

University of Chinese Academy of Sciences

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation

University of Science and Technology of China

Jilin University

Dongfang Electric Corporation (China)

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Deep original information preservation by applying in-situ film formation technology during coring

Petroleum Science (2022)

Liangyu Zhu Tao Liu Zhiyu Zhao Yifan Wu Dongsheng Yang

Accurately obtaining the original information of an in-situ rock via coring is a significant guiding step for exploring and developing deep oil and gas resources. It is difficult for traditional coring technology and equipment to preserve the original information in deep rocks. This study develops a technology for in-situ substance-preserved (ISP), moisture-preserved (IMP), and light-preserved (ILP) coring. This technology stores the original information in real time by forming a solid sealing film on the in-situ sample during coring. This study designed the ISP-IMP-ILP-Coring process and tool. In addition, an ISP-IMP-ILP-Coring process simulation system was developed. The effects of temperature, pressure, and film thickness on the quality of the in-situ film were investigated by performing in-situ film-forming simulation experiments. A solid sealing film with a thickness of 2–3 mm can be formed; it completely covers the core sample and has uniform thickness. The film maintains good ISP-IMP-ILP properties and can protect the core sample in the in-situ environment steadily. This study verifies the feasibility of “film formation during coring” technology and provides strong support for the engineering application of ISP-IMP-ILP-Coring technology.

Coring

Sample (material)

Core sample

10.1016/j.petsci.2022.02.007

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Citations (4)

Research on in-situ condition preserved coring and testing systems

Petroleum Science (2021)

Heping Xie Tao Liu Mingzhong Gao Ling Chen Hong Zhou

As shallow resources are increasingly depleted, the mechanics' theory and testing technology of deep in-situ rock has become urgent. Traditional coring technologies obtain rock samples without retaining the in-situ environmental conditions, leading to distortion of the measured parameters. Herein, a coring and testing systems retaining in-situ geological conditions is presented: the coring system that obtains in-situ rock samples, and the transfer and testing system that stores and analyzes the rocks under a reconstructed environment. The ICP-Coring system mainly consists of the pressure controller, active insulated core reactor and insulation layer and sealing film. The ultimate bearing strength of 100 MPa for pressure-preservation, temperature control accuracy of 0.97% for temperature-retained are realized. CH4 and CO permeability of the optimized sealing film are as low as 3.85 and 0.33 ppm/min. The average tensile elongation of the film is 152.4% and the light transmittance is reduced to 0%. Additionally, the pressure and steady-state temperature accuracy for reconstructing the in-situ environment of transfer and storage system up to 1% and ±0.2 is achieved. The error recorded of the noncontact sensor ring made of low-density polymer is less than 6% than that of the contact test. The system can provide technical support for the deep in-situ rock mechanics research, improving deep resource acquisition capabilities and further clarifying deep-earth processes.

Coring

10.1016/j.petsci.2021.11.003

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Citations (51)

In-situ direct seawater electrolysis using floating platform in ocean with uncontrollable wave motion

Nature Communications (2024)

Tao Liu Zhiyu Zhao Wenbin Tang Yi Chen Cheng Lan

Abstract Direct hydrogen production from inexhaustible seawater using abundant offshore wind power offers a promising pathway for achieving a sustainable energy industry and fuel economy. Various direct seawater electrolysis methods have been demonstrated to be effective at the laboratory scale. However, larger-scale in situ demonstrations that are completely free of corrosion and side reactions in fluctuating oceans are lacking. Here, fluctuating conditions of the ocean were considered for the first time, and seawater electrolysis in wave motion environment was achieved. We present the successful scaling of a floating seawater electrolysis system that employed wind power in Xinghua Bay and the integration of a 1.2 Nm 3 h −1 -scale pilot system. Stable electrolysis operation was achieved for over 240 h with an electrolytic energy consumption of 5 kWh Nm −3 H 2 and a high purity (>99.9%) of hydrogen under fluctuating ocean conditions (0~0.9 m wave height, 0~15 m s −1 wind speed), which is comparable to that during onshore water electrolysis. The concentration of impurity ions in the electrolyte was low and stable over a long period of time under complex and changing scenarios. We identified the technological challenges and performances of the key system components and examined the future outlook for this emerging technology.

10.1038/s41467-024-49639-6

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Citations (21)

High-Strength Hollow Glass Microsphere/Epoxy Resin Composite Insulation Materials for Deep In-Situ Condition Preserved Coring

Geofluids (2022)

Jianping Yang Ling Chen Zhiqiang He Cong Li Bo Yu

To establish in-situ fluidized coal mining technology and a theory of mining mechanics for deep coal resources, it is crucial to obtain a “fidelity rock core” that maintains deep in-situ conditions to understand the physical mechanics of deep rock. Doing so requires the development of in-situ condition-preserved coring (ICP-coring) technology. In this work, hollow glass microsphere/epoxy resin (HGM/EP) composite insulation materials with high strengths were prepared. An epoxy resin matrix with high strength and high-temperature resistance was selected from among epoxy resins cured by different curing agents. Then, a series of composite insulation materials with different HGM volume fractions were prepared. The mechanical strengths of the composites decreased with increasing HGM volume fraction. Then, thermal insulation materials suitable for different ICP-coring depths were selected. Changes in the thermal conductivities and mechanical strengths of the composites were characterized after they were subjected to high water pressure (45 MPa). Verification of the applicability of the thermal insulation material under high water pressure (45 MPa) conditions demonstrated that it met the working requirements for the ICP-coring device.

Coring

Glass microsphere

10.1155/2022/1118434

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Citations (3)

A membrane-based seawater electrolyser for hydrogen generation

Nature (2022)

Heping Xie Zhiyu Zhao Tao Liu Yifan Wu Cheng Lan

Electrolysis of water

10.1038/s41586-022-05379-5

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Citations (500)

Hollow glass microspheres/silicone rubber composite materials toward materials for high performance deep in-situ temperature-preserved coring

Petroleum Science (2021)

Jianping Yang Ling Chen X I Gu Zhiyu Zhao Chenghang Fu

Deep petroleum resources are stored under high temperature and pressure conditions, with the temperature having a significant influence on the properties of rocks. Deep in-situ temperature-preserved coring (ITP-coring) devices were developed to assess deep petroleum reserves accurately. Herein, hollow glass microspheres (HGMs)/silicone rubber (SR) composites that exhibit excellent thermal insulation properties were prepared as thermal insulation materials for deep ITP-coring devices. The mechanism and process of heat transfer in the composites were explored, as well as their other properties. The results show that the HGMs exhibit good compatibility with the SR matrix. When the volume fraction of the HGMs is increased to 50%, the density of the HGMs/SR composites is reduced from 0.97 to 0.56 g/cm3. The HGMs filler introduces large voids into the composites, reducing their thermal conductivity to 0.11 W/m·K. The addition of HGMs into the composites further enhances the thermal stability of the SR, wherein the higher the HGMs filler content, the better the thermal stability of the composites. HGMs significantly enhance the mechanical strength of the SR. HGMs increase the compressive strength of the composites by 828% and the tensile strength by 164%. Overall, HGMs improve the thermal insulation, pressure resistance, and thermal stability of HGMs/SR composites.

Glass microsphere

Coring

Thermal Stability

Silicone rubber

10.1016/j.petsci.2021.11.012

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Citations (16)

A graphene-enhanced high-barrier and fast-curing film for deep in situ condition preserved coring in coal seams

International Journal of Mining Science and Technology (2023)

Dongsheng Yang Zhiyu Zhao Yifan Wu Liangyu Zhu Jingli Lu

Scientific research on deep in situ resources is highly important to the theory and technology system construction for deep in-situ resource exploitation. To obtain high-condition preserved core samples, it is vital to maintain the original material, humidity and luminous flux information inside the core. Therefore, this study proposes a research and development strategy for a high-toughness and high-barrier sealing film based on the molecular structure design and filler synergistic enhancement via a deep solid-state sealing film using in situ substance preservation (ISP), in situ moisture preservation (IMP) and in situ light preservation (ILP) coring principles. A graphene/epoxy composite sealing film with a high barrier, high strength and high toughness was developed. The oxygen permeability of the film was 0.23 cm3/(m2·d), the water vapor permeability was 1.26 g/(m2·d), and the light transmittance was 0. The tensile strength reached 15.4 MPa, and the toughness was 5242.9 kJ/m3. The results from the film substance and moisture preservation performance verification experiments showed that the sealing film had an excellent sealing effect on small molecules, such as water, alkanes and even ions, which further verified that the sealing film greatly contributed to the maintenance and preservation of deep in situ resource reserves and abundance.

Coring

10.1016/j.ijmst.2023.08.005

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Citations (3)

Redox-mediated decoupled seawater direct splitting for H2 production

Nature Communications (2024)

Tao Liu Cheng Lan Min Tang Mengxin Li Yi-Tao Xu

Abstract Seawater direct electrolysis (SDE) using renewable energy provides a sustainable pathway to harness abundant oceanic hydrogen resources. However, the side-reaction of the chlorine electro-oxidation reaction (ClOR) severely decreased direct electrolysis efficiency of seawater and gradually corrodes the anode. In this study, a redox-mediated strategy is introduced to suppress the ClOR, and a decoupled seawater direct electrolysis (DSDE) system incorporating a separate O 2 evolution reactor is established. Ferricyanide/ferrocyanide ([Fe(CN) 6 ] 3−/4− ) serves as an electron-mediator between the cell and the reactor, thereby enabling a more dynamically favorable half-reaction to supplant the traditional oxygen evolution reaction (OER). This alteration involves a straightforward, single-electron-transfer anodic reaction without gas precipitation and effectively eliminates the generation of chlorine-containing byproducts. By operating at low voltages (~1.37 V at 10 mA cm −2 and ~1.57 V at 100 mA cm −2 ) and maintaining stability even in a Cl − -saturated seawater electrolyte, this system has the potential of undergoing decoupled seawater electrolysis with zero chlorine emissions. Further improvements in the high-performance redox-mediators and catalysts can provide enhanced cost-effectiveness and sustainability of the DSDE system.

Oxygen evolution

Electrolysis of water

Electrolytic cell

10.1038/s41467-024-53335-w

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Citations (7)

Continuous decoupled redox electrochemical CO2 capture

Nature Communications (2024)

Tao Liu Yunpeng Wang Yifan Wu Wenchuan Jiang Yuchao Deng

Electrochemical CO

10.1038/s41467-024-55334-3

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