Seepage experiment method for water drive profile model of edge water sandstone gas reservoir

Abstract

The invention discloses a seepage experiment method for a water drive profile model of an edge water sandstone gas reservoir. The method comprises (1) combining adjacent well sections with similar permeability in a reservoir stratum into a single layer according to the similarity ratio of the total thickness of the reservoir stratum to the height of a physical plate model and scaling the single layer on the plate model; (2) making the plate model; (3) making a section sand filling model, filling quartz sand into a groove of the plate model according to the actual reservoir stratum profile sequence for cementing, and placing an impervious partition at the corresponding position of the sand filling model; (4) establishing or controlling the reservoir stratum opening degree; (5) restoring theoriginal state of the gas reservoir; (6) establishing an edge water system; (7) controlling the recovery yield and simulating the gas mining process; (8) conducting data processing to obtain a waterintrusion profile visual saturation distribution map and the gas recovery rate. According to the method, the principle is reliable, the operation is simple, a measurement result is intuitive, the water body propulsion situation in the development process of the edge water gas reservoir can be simulated, and the technical means for the efficient development of the gas reservoir is provided.

Description

technical field [0001] The invention relates to a water flooding section model seepage test method of an edge water gas reservoir, which belongs to the field of oil and natural gas exploration and development. Background technique [0002] For gas reservoirs with deep burial, thick reservoirs, strong heterogeneity, and strong edge water, the water flooding mechanism of rhythm difference is unclear, and the advancement of water directly affects the recovery of gas reservoirs. Therefore, it is of great significance to understand the advance law of water body in the formation with the exploitation of gas reservoirs to prevent premature water breakthrough at the bottom of the well. Due to the limitation of technical equipment, it is currently impossible to carry out visual physical simulation of large-area water flooding profiles under the high temperature and high pressure conditions of the original reservoir. [0003] The water flooding profile refers to the vertical distribu...

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Problems solved by technology

[0004] At present, there are mainly two methods for predicting water breakthrough in edge water gas reservoirs: (1) gas reservoir engineering method (Wang Huiqiang. Method for predicting water breakthrough time of gas wells in edge water gas reservoirs. Special Oil and Gas Reservoirs, 2008, 15(4): 73 -74), assuming that the formation is homogeneous, using the basic law of gas-water two-phase seepage, and through mathematical derivation, a prediction method for water breakthrough in edge water gas reservoirs is obtained. In relatively homogeneous reservoirs, practice has proved that it has a certain practicability, but this method cannot consider the heterogeneity of the reservoir, and for the reservoir with strong vertical heterogeneity, the error of water breakthrough time is very large

(2) Numerical simulation method (Liu Xiaojuan. Water saturation analysis method of two-dimensional section of water drive reservoir. Journal of Northwest University (Natural Science Edition), 2012, 42(4): 000637-641), by directly establishing block numerical A simulation model is used to study the advancement of water flooding profiles, but due to the large number of parameters required and the heavy workload, there are certain limitations, especially in field applications in the early stage of gas reservoir development

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