Performance of a deep in situ pressure-preserving coring controller in a high-temperature and ultrahigh-pressure test system  

作　　者：Xiaojun Shi Heping Xie Cong Li Jianan Li Guikang Liu Zhenxi You Mingzhong Gao 

机构地区：[1]State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu,610065,China [2]State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Sichuan University,Chengdu,610065,China [3]College of Mechanical Engineering,Sichuan University,Chengdu,610065,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第2期877-896,共20页岩石力学与岩土工程学报(英文)

基　　金：funding support from National Natural Science Foundation of China(Grant Nos.52225403,51827901,and 52304146).

摘　　要：The pressure-preserving controller is the key component of deep in situ pressure-preserving coring(IPP-Coring).With increasing drilling depth,the environmental temperature and pressure increase accordingly.However,due to the strength and sealing problems of pressure-preserving controllers,the coring pressure is generally lower than 70 MPa.Establishing a high-temperature and ultrahigh-pressure test system is highly important for improving the strength and sealing performance of pressure-preserving controllers.This paper introduces a high-temperature and ultrahigh-pressure test system for deep IPP-Coring controller performance analysis.The device includes six parts:an auxiliary air source system,a pressurization system,a temperature control system,a hydraulic system,a data acquisition and electrical control system,and an ultrahigh-pressure vessel.The test system can reconstruct a 150℃ and 200 MPa in situ environment and simulate and test the movement state of the corer and the stability of the pressure-preserving action trigger of the pressure-preserving controller in the deep IPP-Coring process.To verify the performance of this test system,saddle-shaped pressure-preserving controllers made of four different materials were subjected to pressure tests under normal-temperature and high-temperature conditions.The results showed that the ultimate pressure-bearing capability of the pressure-preserving controller greatly varied between normal-temperature and high-temperature conditions.The pressure-preserving ability and sealing performance of the pressure-preserving controller decreased significantly at high temperature,and the pressure-preserving controller exhibited significantly different sealing failure characteristics due to material differences.This study is important for progressing the extraction and evaluation of deep reservoir resources.

关 键 词：Deep mining In situ pressure-preserving coring(IPP-Coring) Deep in situ conditions Test system development 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]