Maximum Pressure Threshold Increase Test for Jintan Salt Cavern Gas Storage

doi:10.11885/j.issn.1674-5086.2017.11.09.02

Abstract

Abstract: The objective of the present study was to accurately ascertain the minimum principal stress of the gas chamber layer of salt cavern gas storages in order to determine the maximum pressure threshold, thereby ensuring the safe and continuous operation of the gas chamber and the maximization of the function of salt caverns. Small-scale hydraulic fracturing tests were carried out in the Jintan salt cavern gas storage to measure the minimum principal stress in five layers. Eighty percent of the minimum principal stress of 22.5 MPa (i.e., 18 MPa) at the casing shoe of the injection-production well B was selected as the theoretical maximum pressure threshold. The maximum pressure threshold was also determined using numerical simulation. The results showed that the injection-production well B met the gas chamber stability and airtightness requirements at the maximum pressure threshold of 18 MPa. A 0.5 MPa increase in the maximum pressure threshold was determined for the Jintan salt cavern gas storage based on the technical parameters and safety considerations of the injection-production station compressor. Real-time microseismic technology was used to monitor the stability of the chamber and the surrounding rock during the pressure increase process. After the on-site pressure test, the maximum pressure threshold of the injection-production well B reached 17.5 MPa, the storage capacity increased from 3, 481.06×10⁴ m³ to 3, 590.39×10⁴ m³, and the functional gas volume increased by 5.11% from 2, 137.02×10⁴ m³ to 2, 246.15×10⁴ m³. Although the industry generally uses the empirical value of 80%~85% of the minimum principal stress as the maximum pressure threshold for salt cavern gas storages, our study showed that the maximum pressure threshold needs to be numerically simulated. Based on the theoretical simulation studies and the field test results, we have determined that the maximum pressure threshold of the Jintan salt cavern gas storage can be increased from the current 17.0 MPa to 17.5 MPa.

Key words: salt cavern gas storage, maximum pressure threshold, minimum principal stress, stability, microseism

CLC Number:

TE822

JING Gang, HE Jun, CHEN Jiasong, YANG Lin, LI Jianjun. Maximum Pressure Threshold Increase Test for Jintan Salt Cavern Gas Storage[J]. 西南石油大学学报(自然科学版), 2018, 40(6): 77-84.

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