Study on the Influence Law of Adjacent Cavity of Natural Gas Energy Storage in Salt Rock

Energy storage is a matter of national economy and People's livelihood. Salt rock underground natural gas energy storage is considered as an ideal place for natural gas energy storage. Taking the natural gas energy storage construction in the Jintan reservoir area of Jiangsu province as the engineering background, by combining the geological characteristics of the underground salt rock, the geological report of the proposed area was used to establish a numerical model, the influence of interlayer, distance, etc. on adjacent cavities was simulated and analyzed, thus the distribution law regarding stress and displacement of the cavity spacing line can be clear. The results show that, the vertical pressure on the spacing line MN presents basically consistent change rules, when the cavity spacing is gradually increased from 0.5D to 3.0D (D is the diameter of the cavity). If the vertical stress and vertical displacement of the gas storage spacing are used as the criterion, the minimum allowable spacing of the gas storage cavity should be 2.0D. At the same time, the number of interlayers in the upper part of the cavity should be reduced as much as possible in the design phase of storage groups, to reduce the stress value between adjacent cavities, lower the mutual influence between the cavities and guarantee stable gas storage cavity. By combining theory and simulation, the conclusions can provide technical support and decision-making basis for the construction of salt rock underground natural gas energy storage group containing interlayer salt rock.