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Magnetically controlled self-sealing pressure-preserved coring technology

Petroleum Science 2024年第5期21卷 3464-3481页

作者： Gui-Kang Liu He-Ping Xie Cong Li Zhen-Xi You Xiao-Jun Shi Jian-Jun Hu Ming-Zhong Gao State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering College of Water Resource and Hydropower Sichuan University Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green Energy College of Civil and Transportation Engineering Shenzhen University School of Mechanical Engineering Sichuan University

Pressure-preserved coring is an effective means to develop deep resources. However, due to the complexity of existing pressure-preserved technology, the average success rate of pressure-preserved coring is low. In response, a novel in situ magnetically controlled self-sealing pressure-preserved coring technology for deep reserves has been proposed and validated. This innovative technology distinguishes itself from conventional methods by employing noncontact forces to replace traditional pretensioning mechanisms, thereby enhancing the mechanical design of pressure-preserved coring equipment and significantly boosting the fault tolerance of the technology. Here, we report on the design,theoretical calculations, experimental validation, and industrial testing of this technology. Through theoretical and simulation calculations, the self-sealing composite magnetic field of the pressure controller was optimized. The initial pre-tensioning force of the optimal magnetic field was 13.05 N. The reliability of the magnetically controlled self-sealing pressure-preserved coring technology was verified using a self-developed self-sealing pressure performance testing platform, confirming the accuracy of the composite magnetic field calculation theory. Subsequently, a magnetically controlled self-triggering pressure-preserved coring device was designed. Field pressure-preserved coring was then conducted,preliminarily verifying the technology's effective self-sealing performance in industrial ***, the technology was analyzed and verified to be adaptable to complex reservoir environments with pressures up to 30 MPa, temperatures up to 80℃, and p H values ranging from 1 to 14. These research results provide technical support for multidirectional pressure-preserved coring, thus paving a new technical route for deep energy exploration through coring.

关键词： In situ pressure-preserved coring Magnetically controlled self-sealing Magnetic design Deep earth exploration

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The mechanism of unconventional hydrocarbon formation: Hydrocarbon self-sealing and intermolecular forces

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Petroleum Exploration and Development 2021年第3期48卷 507-526页

作者： JIA Chengzao PANG Xiongqi SONG Yan China National Petroleum Corporation Beijing 100724China State Key Laboratory of Oil and Gas Resources and Exploration Beijing 102249China School of Earth Sciences China University of Petroleum(Beijing)Beijing 102249China Institute of Unconventional Research China University of PetroleumBeijing 102249China

The successful development of unconventional hydrocarbons has significantly increased global hydrocarbon resources, promoted the growth of global hydrocarbon production and made a great breakthrough in classical oil and gas geology. The core mechanism of conventional hydrocarbon accumulation is the preservation of hydrocarbons by trap enrichment and buoyancy, while unconventional hydrocarbons are characterized by continuous accumulation and non-buoyancy accumulation. It is revealed that the key of formation mechanism of the unconventional reservoirs is the self-sealing of hydrocarbons driven by intermolecular forces. Based on the behavior of intermolecular forces and the corresponding self-sealing, the formation mechanisms of unconventional oil and gas can be classified into three categories:(1) thick oil and bitumen, which are dominated by large molecular viscous force and condensation force;(2) tight oil and gas, shale oil and gas and coal-bed methane, which are dominated by capillary forces and molecular adsorption;and(3) gas hydrate, which is dominated by intermolecular clathration. This study discusses in detail the characteristics, boundary conditions and geological examples of self-sealing of the five types of unconventional resources, and the basic principles and mathematical characterization of intermolecular forces. This research will deepen the understanding of formation mechanisms of unconventional hydrocarbons, improve the ability to predict and evaluate unconventional oil and gas resources, and promote the development and production techniques and potential production capacity of unconventional oil and gas.

关键词： unconventional hydrocarbons hydrocarbon reservoir formation mechanism self-sealing intermolecular forces hydrocarbon self-sealing formation mode hydrocarbon exploration and development

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Degradation and biological properties of Ca-P contained micro-arc oxidation self-sealing coating on pure magnesium for bone fixation

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Regenerative Biomaterials 2015年第2期2卷 107-118页

作者： Weidan Wang Peng Wan Chen Liu Lili Tan Weirong Li Lugee Li Ke Yang Institute of Metal Research Chinese Academy of Sciences72 Wenhua RoadShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China EONTEC Co. LtdDongguanGuangdong523662China

Poor corrosion resistance is one of the main disadvantages for biodegradable magnesium-based metals,especially applied for bone fixation,where there is a high demand of bio-mechanical strength and *** coating has been proved as an effective method to control the in vivo *** this study a Ca-P self-sealing micro-arc oxidation(MAO)coating was studied to verify its efficacy and biological properties by in vitro and in vivo *** was found that the MAO coating could effectively retard the degradation according to immersion and electrochemical tests as well as 3D reconstruction by X-ray tomography after *** MAO coating exhibited no toxicity and could stimulate the new bone ***,the Ca-P self-sealing MAO coating could be a potential candidate for application of biodegradable Mg-based implant in bone fixations.

关键词： pure magnesium degradation self-sealing micro-arc oxidation coating in vivo implantation

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Thermo-hydro-mechanical behavior of clay rock for deep geological disposal of high-level radioactive waste

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 992-1008页

作者： Chun-Liang Zhang Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) Repository Safety Research Division Theodor-Heuss-Str 4 Braunschweig 38122 Germany

In the context of deep geological disposal of radioactive waste in clay formations, the thermo-hydro- mechanical （THM） behavior of the indurated Callovo-Oxfordian and Opalinus clay rocks has been extensively investigated in our laboratory under repository relevant conditions：（1） rock stress covering the range from the lithostatic state to redistributed levels after excavation; （2） variation of the humidity in the openings due to ventilation as well as hydraulic drained and undrained boundary conditions; （3） gas generation from corrosion of metallic components within repositories; and （4） thermal loading from high-level radioactive waste up to the designed maximum temperature of 90 ~C and even beyond to 150 ~C, Various important aspects concerning the long-term barrier functions of the clay host rocks have been studied：（1） fundamental concept for effective stress in the porous clay-water system; （2） stress- driven deformation and damage as well as resulting permeability changes; （3） moisture influences on mechanical properties; （4） self-sealing of fractures under mechanical load and swelling]slaking of clay minerals upon water uptake; （5） gas migration in fractured and resealed claystones; and （6） thermal impact on the hydro-mechanical behavior and properties, Major findings from the investigations are summarized in this paper,

关键词： Repository Clay rock Deformability Swelling self-sealing Water permeability Gas migration Thermal impact

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