Device and method for testing gas-liquid sulfur phase permeation curve of high-temperature high-pressure high-sulfur-content gas reservoir

Abstract

The invention discloses a device and a method for testing a gas-liquid sulfur phase permeation curve of a high-temperature high-pressure high-sulfur-content gas reservoir. The testing device comprises a displacement system, a stratum condition simulation system, a back-pressure system, a data testing system and a data acquisition system. The testing method comprises the following steps: selecting and treating a rock core; preparing rock core saturated stratum water and liquid sulfur; simulating a high-temperature and high-pressure environment of the stratum; determining the condition of liquid sulfur phase permeability under irreducible water saturation; performing a phase permeation test on filling of gas-liquid sulfur according to a set ratio; recording the amount VSi of liquid sulfur and the gas amount Vgi generated totally; correcting the stratum condition; calculating the relative permeability Krs of the liquid sulfur phase, the relative permeability Krg of the gas phase and the gas saturation Sg of a rock sample at each moment and the like. The device and the method disclosed by the invention can be used for safely, conveniently, rapidly, accurately and efficiently measuring the high-temperature high-pressure gas-liquid sulfur phase permeation data and providing scientific data support for making a reasonable development scheme for the high-sulfur-content gas reservoir.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a high-temperature and high-pressure gas-liquid sulfur phase permeability curve testing device and method in line with the actual development and production of high-sulfur gas reservoirs. Background technique [0002] High-sulfur gas reservoirs are widely distributed around the world, and more than 400 high-sulfur gas fields with industrial value have been discovered in the world, mainly distributed in Canada, the United States, France, Germany, Russia, China and the Middle East. Global reserves of high-sulfur gas reservoirs exceed 736320×108m 3 , accounting for about 40% of the world's total natural gas reserves. Northeast Sichuan Basin in my country is rich in resources. For example, Dukouhe, Tieshanpo, Puguang, Longgang, Yuanba, Luojiazhai, and Longwangmiao in Feixianguan Formation and Changxing Formation are all high-sulfur gas r...

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Problems solved by technology

[0003] However, the current test methods for gas-liquid phase permeability in the field of petroleum development are mainly based on the standard SY / T5345-2007 "Measurement Method for Relative Permeability of Two-phase Fluids in Rocks", which is measured by the steady-state method or the unsteady-state method. - The experimental research of liquid sulfur phase permeability is in a blank stage, and the experimental conditions in the existing gas-water phase permeability chamber are quite different from the real formation seepage conditions, and cannot meet the gas-liquid sulfur phase permeability conditions, and the accuracy of the existing measurement equipment is insufficient etc., resulting in that the existing experimental devices cannot measure the gas-liquid sulfur phase permeability curve at all.

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