Method for determining the minimum design operating pressure of underground salt cavern gas storage

Abstract

The invention belongs to the field of development of oil and gas resources, and particularly relates to a method for determining minimum design operation pressure of underground salt cavern gas storage. The method comprises the following steps of: manufacturing a salt rock sample; determining salt rock strength; determining crustal stress; determining safety coefficient; and determining the minimum design operation pressure, wherein the salt rock sample is a slim cylinder; the ratio of height to diameter of the salt rock sample is not less than 2; the length of the salt rock sample is not greater than 200 mm, the diameter is not greater than 80 mm, the surface roughness is not greater than 0.2 mm, and the ellipticity is not greater than 2 percent; the triaxial compression and tensile damage test frequency is not less than 6; a loading mode in a test process is multi-stage loading; the loading time of each stage of load is not less than 2 hours; confining pressure in the test process is hydraulically applied; and hydraulic oil is mineral oil, synthetic hydrocarbon or biological base oil. According to the invention, the method and the steps for determining the minimum design operation pressure of the underground salt cavern gas storage are defined; and the method has extremely high engineering application value and field operability.

Description

technical field [0001] The invention belongs to the field of oil and gas resource development, and in particular relates to a method for determining the minimum design operating pressure of an underground salt cavern gas storage. Background technique [0002] In order to ensure the peak-shaving capability of the salt-cavern gas storage and improve the utilization efficiency of cushion gas, it is necessary to reduce the operating pressure as much as possible during the operation of the salt-cavern gas storage, so that the shear stress on the surrounding rock of the salt-cavern gas storage increases, which may cause salt The top of the hole and the wall of the cavity collapsed and damaged. Therefore, it is of great significance to reasonably determine the minimum design operating pressure of the salt-cavern gas storage to ensure the safety of the gas storage and improve the peak-shaving capability. [0003] At this stage, empirical methods are mainly used to determine the min...

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Problems solved by technology

[0005] In order to overcome the defects in the prior art, the object of the present invention is to provide a method for determining the minimum design operating pressure of an underground salt cavern gas storage, accurately quantify the range of the minimum operating pressure value, clarify the mechanical principle of the minimum operating pressure design, and solve the problem of underground salt cavern gas storage. Difficulties in Determining the Minimum Operating Pressure of Cave Gas Storage

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