Development of a pressure coring system for the investigation of deep underground exploration

Da Guo ¹Ling Chen ²Zhongya Zhou ³Dingming Wang ⁴Yiwei Zhang ⁴Xun Yang ¹Xin Fang ⁴Xiaojun Wang ³Heping Lu ³Lin Dai ³Heping Xie⁴

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作者信息

1. State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China;School of Mechanical Engineering,Sichuan University,Chengdu 610065,China;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,Shenzhen 518060,China
2. State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China;School of Mechanical Engineering,Sichuan University,Chengdu 610065,China
3. Petroleum Engineering Technology Research Institute of Sinopec Jianghan Oilfield Company,Wuhan 430035,China
4. State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu 610065,China;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,Shenzhen 518060,China
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Abstract

To provide a more accurate evaluation of the scale of deep underground resources,a new pressure coring system was carefully developed and its strength and safety of the engineering were verified by theoret-ical analyses and numerical simulation.The designed pressure coring system can obtain cores with length of 3 m and diameter of 50 mm at 70 MPa.The results of the ball-drop operation experiment demonstrate that differential motion assembly can effectively cut a safety pin by applying a tensile force of 4852 N,and it can lift the core tube through the center pole to complete a series of mechanical actions to seal the pressure.Additionally,by maintaining pressures at 70 MPa for 30 min,the pressure sealing capacity of the system was proven.Furthermore,a core sample with a diameter of 50 mm was obtained through a core drilling experiment and the coring performance of the pressure coring system was veri-fied.This study can not only enrich the existing onshore coring technology but also provide a theoretical guide and design criteria for the development of similar pressure coring systems to meet the demand for deeper underground exploration.

Key words

Underground exploration/In-situ coring/Pressure coring/Oil and gas production

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基金项目

Shenzhen National Science Fund for Distinguished Young Scholars(RCJC20210706091948015)

National Science Fund for Distinguished Young Scholars(52225403)

National Natural Science Foundation of China(51827901)

出版年

2023

矿业科学技术学报(英文版)

中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDEI

影响因子：1.222

ISSN：2095-2686

参考文献量10

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