CN-121995032-A - Salt cavern gas storage roof collapse test method and test device

CN121995032ACN 121995032 ACN121995032 ACN 121995032ACN-121995032-A

Abstract

The invention discloses a method and a device for testing top plate collapse of a salt cavern gas storage, which relate to the technical field of salt cavern gas storage, and comprise the following steps: the method comprises the steps that firstly, a roof rock core sample is fixedly arranged in a pressure-resistant bin, so that the roof rock core sample and the pressure-resistant bin form a closed simulation cavity; filling test liquid into the simulation cavity, placing the bottom end of the roof core sample into the test liquid, discharging air in the simulation cavity, and observing the peeling situation of the roof core sample.

Inventors

YU HAIBING
JI WENDONG
WAN JIFANG
LI JINGCUI
PENG WEI
ZHANG CE
ZHANG ZHIXIN
ZHU NAN

Assignees

中能建深地技术(湖北)有限公司

Dates

Publication Date: 20260508
Application Date: 20260113

Claims (10)

1. A method for testing the collapse of a top plate of a salt cavern gas storage is characterized by comprising the following steps: The method comprises the steps that firstly, a roof rock core sample is fixedly arranged in a pressure-resistant bin, so that the roof rock core sample and the pressure-resistant bin form a closed simulation cavity; Filling test liquid into the simulation cavity, placing the bottom end of the roof core sample into the test liquid, discharging air in the simulation cavity, and observing the peeling condition of the roof core sample.
2. A method for testing roof collapse of a salt cavern gas storage according to claim 1, further comprising the step of continuing to inject test liquid into the simulated cavity, raising the pressure of the test liquid in the simulated cavity to a target pressure, and observing the peeling condition of a roof core sample.
3. A method for testing roof collapse of a salt cavern gas storage according to claim 2, wherein in step three, the test liquid in the simulated cavity is heated to raise the temperature of the test liquid in the simulated cavity to a target temperature, and the peeling condition of the roof core sample is observed.
4. A method for testing the collapse of a top plate of a salt cavern gas storage according to claim 1, 2 or 3 is characterized in that after the test liquid is injected into a simulation cavity, the test liquid is discharged from the bottom of the simulation cavity, and meanwhile, high-pressure test gas is injected into the simulation cavity from the top of the simulation cavity, so that the peeling condition of a core sample of the top plate is observed.
5. A method for testing the roof collapse of a salt cavern gas storage according to claim 4, wherein after the bottom end of a roof core sample is separated from the test liquid, the test liquid is stopped from being discharged from the bottom of the simulation cavity, the high-pressure test gas is stopped from being injected into the simulation cavity from the top of the simulation cavity, and the peeling condition of the roof core sample is observed.
6. A method for testing the collapse of a top plate of a salt cavern gas storage according to claim 4, wherein after the simulated cavity is filled with high-pressure test gas, the simulated cavity is cyclically discharged with the high-pressure test gas and injected with the high-pressure test gas, and the peeling condition of a core sample of the top plate is observed.
7. The method for testing the collapse of the top plate of the salt cavern gas storage according to claim 1 is characterized in that the pressure-resistant bin is a transparent bin, and a high-frequency high-definition camera is arranged outside the pressure-resistant bin.
8. The method for testing the roof collapse of the salt cavern gas storage according to claim 1, wherein the side wall of the roof core sample is subjected to sealing and isolation treatment before the first step.
9. The test device is applied to the salt cavern gas storage roof collapse test method according to any one of claims 1 to 8, and is characterized by comprising a roof core sample and a pressure resistant bin, wherein the roof core sample is fixedly arranged in the pressure resistant bin, and a closed simulation cavity is formed by the roof core sample and the pressure resistant bin.
10. The test device of claim 9, further comprising a pressure block, a telescopic slip and a telescopic double-layer sealing rubber cylinder, wherein the telescopic slip is fixedly connected with the top end of the pressure-resistant bin, the telescopic slip is sleeved outside the top plate core sample, the top end of the top plate core sample can be tightly held and locked by the telescopic slip, the telescopic double-layer sealing rubber cylinder is arranged below the telescopic slip, the telescopic double-layer sealing rubber cylinder is sleeved outside the top plate core sample, the telescopic double-layer sealing rubber cylinder is in sealing contact with or connected with the outer side wall of the top plate core sample and the inner side wall of the pressure-resistant bin, the pressure block is arranged on the top end face of the top plate core sample, the cross section area of the pressure block is larger than the cross section area of the top plate core sample, a water inlet and a water outlet are arranged on the bottom of the side wall of the pressure-resistant bin, a heater and a temperature sensor are arranged in the middle of the side wall of the pressure-resistant bin, the heater can heat test liquid in the simulation cavity, the temperature sensor can detect the liquid in the simulation cavity, the pressure sensor is arranged on the side wall of the pressure-resistant bin, and the pressure sensor is arranged on the side wall of the simulation cavity.

Description

Salt cavern gas storage roof collapse test method and test device Technical Field The invention relates to the technical field of salt cavern gas storage, in particular to a method and a device for testing top plate collapse of salt cavern gas storage. Background Underground salt cavern gas storages have become key facilities for energy strategic reserves and natural gas peak shaving due to their huge storage capacity, excellent peak shaving capacity and higher operational safety. The working principle is that the underground salt rock stratum is utilized, and a huge underground cavity is formed through a water-soluble cavity for storing gas and energy. In the whole life cycle of the salt cavern gas storage, the salt cavern gas storage can undergo a plurality of operation stages such as brine filling, gas injection and brine discharge, long-term circulating gas injection and production and the like. During these phases, the pressure, temperature and stress environment of the surrounding rock inside the salt cavern gas storage can change drastically and periodically, which makes the stability of the salt cavern gas storage roof a serious challenge. The roof collapses and peels off, so that the effective volume of the gas storage can be obviously reduced, the peak shaving capacity is reduced, and a series of disastrous consequences such as underground pipe column collapse, gas leakage and even surface subsidence are more likely to be caused. Therefore, it is important to accurately predict and evaluate the stability of the roof before and during construction and operation of the salt cavern gas storage. Disclosure of Invention The invention aims to provide a salt cavern gas storage roof collapse test method and test device, which are used for solving the problems in the prior art, simulating the real working condition of the salt cavern gas storage and predicting the peeling condition of the salt cavern gas storage roof. In order to achieve the above object, the present invention provides the following solutions: The invention provides a salt cavern gas storage roof collapse test method, which comprises the following steps: The method comprises the steps that firstly, a roof rock core sample is fixedly arranged in a pressure-resistant bin, so that the roof rock core sample and the pressure-resistant bin form a closed simulation cavity; Filling test liquid into the simulation cavity, placing the bottom end of the roof core sample into the test liquid, discharging air in the simulation cavity, and observing the peeling condition of the roof core sample. Preferably, the method further comprises the step three of continuously injecting test liquid into the simulated cavity, increasing the pressure of the test liquid in the simulated cavity to the target pressure, and observing the peeling condition of the roof core sample. Preferably, in the third step, the test liquid in the simulated cavity is heated to raise the temperature of the test liquid in the simulated cavity to the target temperature, and the peeling condition of the roof core sample is observed. Preferably, after the test liquid is injected into the simulation cavity, the test liquid is discharged from the bottom of the simulation cavity, and meanwhile, high-pressure test gas is injected into the simulation cavity from the top of the simulation cavity, so that the peeling condition of the roof core sample is observed. Preferably, after the bottom end of the roof core sample is separated from the test liquid, the discharge of the test liquid from the bottom of the simulation cavity is stopped, the injection of the high-pressure test gas into the simulation cavity from the top of the simulation cavity is stopped, and the peeling condition of the roof core sample is observed. Preferably, after the simulation cavity is filled with the high-pressure test gas, the simulation cavity is circulated to discharge the high-pressure test gas and inject the high-pressure test gas, and the peeling condition of the roof core sample is observed. Preferably, the pressure-resistant bin is a transparent bin, and a high-frequency high-definition camera is arranged outside the pressure-resistant bin. Preferably, before the first step, the side wall of the roof core sample is subjected to sealing and isolation treatment. The invention also provides a test device which is applied to the salt cavern gas storage roof collapse test method, and comprises a roof core sample and a pressure resistant bin, wherein the roof core sample is fixedly arranged in the pressure resistant bin, and the roof core sample and the pressure resistant bin enclose a closed simulation cavity. Preferably, the pressure-resistant dual-layer sealing device further comprises a pressure block, a telescopic slip and a telescopic dual-layer sealing rubber cylinder, wherein the telescopic slip is fixedly connected with the top end of the pressure-resistant bin, the telescopic slip is sleeved outside the top p