Experimental device and method for measuring the combined layer permeability of multi-layered gas wells

Abstract

The invention relates to an experimental device and method for measuring the combined layer permeability of multi-layered gas wells. The device includes: a stratum simulator, in which multiple layers of rock cores are stacked, interlayers are arranged between adjacent rock cores, and the top and bottom walls of the stratum simulator and the corresponding rock cores are both A deformable gasket is provided to form an overburden fluid chamber between the top wall and / or bottom wall and the corresponding gasket, and a plurality of valves respectively communicated with the corresponding core are arranged on the side wall of the formation simulator shell. The measuring gas inlet is provided on the casing bottom wall of the formation simulator with a covering pressure fluid inlet communicating with the covering pressure fluid chamber, which extends through the top wall of the formation simulator and passes through all the cores for extracting the measuring gas. The simulated wellbore of the simulated wellbore is measured to measure the constant gas output of the simulated wellbore, and the combined layer permeability of the multi-layer gas production well is obtained through the gas output.

Description

technical field [0001] The invention relates to oil and gas well engineering, in particular to an experimental device for measuring the combined layer permeability of multi-layered gas wells. The invention also relates to a method for measuring the combined layer permeability of the multilayered gas production well by using the experimental device. Background technique [0002] Most of the low-permeability gas reservoirs are multi-layer reservoirs. In order to increase the single well production, gas wells often exploit multiple reservoirs at the same time. The simultaneous production of gas from multiple underground reservoirs is represented as the output of one wellhead on the surface. [0003] The combined permeability of multi-layered gas wells is an important parameter of gas wells in multi-layered reservoirs. At present, the actual production data of gas wells can be used to analyze the combined permeability of multi-layered gas wells. However, this analysis method is...

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Problems solved by technology

[0003] The combined permeability of multi-layered gas wells is an important parameter of gas wells in multi-layered reservoirs. At present, the actual production data of gas wells can be used to analyze the combined permeability of multi-layered gas wells. However, this analysis method is limited by the actual production time. restrictions, it is difficult to obtain this law accurately and intuitively

In addition, the operation cost of on-site testing is high and the cycle is long

Numerical simulation software is restricted by the accuracy of the gas well reservoir model, and its intuition and accuracy are also poor

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