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- 저자 : Feilong Cheng (검색결과 4 건)
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Design and analysis of sealed suspension module based on solid expandable tubular repair technology
Xiaohua Zhu,Feilong Cheng,Changshuai Shi,Jia’nan Li,Kailin Chen 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.2
The ability of sealing suspension of solid expandable tubular (SET) is one of the important factors that determine whether pipe can expand normally and serve. To solve the problem that the SET deviates from the original position (causing for the failure to repair of leakage well) due to the insufficient suspension force after expansion, this paper establishes the two-dimensional coupling model of SET-rubber ring-expansion cone-casing based on laboratory experiment parameters, designs the parameters of the sealed suspension rubber ring and conducts simulation. The results show that when the compression amount of the rubber ring is designed to be 47 %-58 % of the rubber thickness, the SET has excellent sealing ability after expansion and can meet the requirements of suspension force; too much compression will affect the service life of the rubber ring. When the length of the rubber ring is 50 mm-110 mm, the driving force and contact pressure during expansion are suitable; the rubber ring spacing is designed to be 110 mm, which avoids interference after rubber compression and saves material. In addition, the vulcanizing bonding strength of the rubber ring should be greater than 120 kN to avoid peeling off due to the failure of the rubber ring and SET bonding. The research results of this paper provide a theoretical basis for the design of sealing suspension module of SET repair technology.
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Mechanical plugging—solid expandable tubular refracturing technology
Xiaohua Zhu,Feilong Cheng,Changshuai Shi,Kailin Chen 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.6
To solve the three major problems of low production, low efficiency and low permeability of oil fields, it is necessary to develop new tight oil layers or shale oil outside the original perforated section in the well that has been perforated. The key to the success of repeated fracturing operations is the ability to block the original perforation of the well. At present, with tubing fracturing construction, volume fracturing of the target reservoir cannot be achieved due to limited displacement, and the effect of reservoir transformation is not obvious, affecting the productivity of the old well. Based on the above problems, this paper proposes a new blocking method suitable for fracturing wells - solid expansdable tubular (SET) plugging. In this paper, it established SET-expansion cone-casing-rubber ring 2D dynamic model which considers the friction, and contact, to analyze the effect of compression and length of rubber ring and the constraint condition of SET on sealing performance; laboratory experiments were carried out and data on driving force, sealing capacity and suspension force were obtained. The results show that optimizing the parameters of expansion cone structure can effectively reduce the residual stress of SET and driving force after expansion; the construction method of SET and the parameters of rubber ring are the main factors that affect the suspension sealing ability, and paper proposes an effective solution; in addition, experiment results show that the SET meets the requirements of fracturing construction with internal pressure greater than 60 MPa and suspension force greater than 600 kN after expansion, and can be used to seal the well body structure of refracturing wells with fewer perforations and shorter distances, and the diameter can be guaranteed to reach 112 mm. The research results provide new ideas and solutions for repeated pressure wells and high-pressure plugging.
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Assist Your Study at Home: Design, Implementation and Evaluation of the ULS System
Mianxiong Dong,Kaoru Ota,Feilong Tang,Minyi Guo,Zixue Cheng 보안공학연구지원센터 2008 International Journal of Smart Home Vol.2 No.1
With the great progress of technologies, computers are embedded into everywhere to make our daily life convenient, efficient and comfortable. Further more, most of them are small, powerful, intelligent and invisible. In a ubiquitous computing environment, support methods for learning are more effective than some traditional ways, such as WBT (Web-Based Training) and e-learning. In this paper, we proposed a support method which aims to encourage a learner to acquire his/her learning habit based on Behavior Analysis. The supports to the learner are provided through a scheduler system, a Ubiquitous Learning Scheduler (ULS). In our design, the learner’s situations are collected by sensors and analyzed by comparing them to his/her learning histories. Based on this information, supports are provided to the learner in order to help him/her forming a good learning style. Our Research results revealed that ULS not only benefited learners to acquire their learning habits but also improved their self-directed learning styles.
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Mianxiong Dong,Kaoru Ota,Feilong Tang,Minyi Guo,Zixue Cheng 보안공학연구지원센터 2008 International Journal of Smart Home Vol.2 No.3
With the rapid progress on the Internet Technology, many projects have been proposed in terms of remote education system such as WBT (Web-Based Training) and E-learning. Such systems can help learners for studying by themselves based on their own learning history in a virtual world. However, learners usually spend time in the real world during studying, exercising, and the other activities. It seems the systems do not give enough support to learners in the real world. Ubiquitous technologies make it possible to provide services to learners anytime and anywhere in the real world. It means learners can receive more meticulous, individually-targeted support in ubiquitous environments. In this paper, we propose a ubiquitous environment to support college students, professors, and visitors in a laboratory to encourage positive research activities. Actions of people in the Ubiquitous Laboratory (U-Lab) are individually recorded by sensor networks and analyzed to provide suitable supports. Based on these collected information, U-Lab provides services such as to grasp a precise research progress and share research information among students and professors. We also propose a method to advise students to improve their research activities.
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