Mixed core testing chamber and mud rock breakthrough pressure testing device

Abstract

The invention discloses a mixed core testing chamber and a mud rock breakthrough pressure testing device. Two mud rock layers are arranged in an inner cavity of the core testing chamber. A sandstone layer is arranged between the two mud rock layers. Reserved spaces exist between the upper mud rock layer and the upper end of the core testing chamber and between the lower mud rock layer and the lower end of the core testing chamber. Water injection openings for injecting water into the reserved spaces, a water and gas injection opening for injecting water and gas into the sandstone layer, and a water drainage opening are formed in the core testing chamber. The water injection openings of the mixed core testing chamber are communicated with a water tank through water pipes. The water and gas injection opening is connected with the water tank and a gas bottle through pipelines in parallel. The water drainage opening is connected into a wastewater pool through a water pipe. A switching valve and a pressure gauge are connected in series on each pipeline. The water tank is connected with a pressurization pump. Multiple probe sets are inserted in the sandstone layer. Pressure and electrical resistivity detected by the probe sets are transmitted into a PC end to be analyzed, and then the mud rock breakthrough pressure testing device is formed. The mud rock breakthrough pressure testing device overcomes the defect that actual formation conditions can not be simulated through traditional breakthrough pressure tests, the change situations of moisture content are tested through the probe sets, and tests can be more precise.

Description

technical field [0001] The invention relates to a mixed rock core test chamber and a mudstone breakthrough pressure test device comprising the mixed rock core test chamber, which is suitable for oil reservoir engineers to conduct rock multiphase fluid breakthrough pressure test experiments. Background technique [0002] In multi-layer sandstone gas reservoirs, the gas layer and the water layer are separated by a mudstone layer. When the gas layer is produced, the pressure in the gas layer is continuously reduced, while the pressure of the water layer remains constant, and there will be a gap between the gas layer and the water layer. When the pressure difference reaches the breakthrough pressure of the mudstone interlayer, formation water channeling will occur in the gas layer, and water will enter the gas layer to reduce the productivity of the gas well and affect the normal production of the gas well. The existing mudstone breakthrough pressure test method is a static test...

AI Technical Summary

Problems solved by technology

The defects of the existing method are: (1) the flow of oil and gas is not considered in the test process, and the flow mode is quite different from the actual; (2) it is difficult to observe when the water comes out of the outlet, and the water sees a lag compared to the breakthrough; (3) the capillary flow is not considered. end effect

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