Bridge imitation and flow measurement avoidance type cross rock core permeability measurement method and device

Abstract

The invention discloses a bridge imitation and flow measurement avoidance type cross rock core permeability measurement device and method. The disclosed measurement device needs four rock core holding units and a differential pressure gauge, and the four rock core holding units and the differential pressure gauge are assembled by a plurality of conduits and four tees in a Wheatstone bridge imitation manner. The disclosed measurement method comprises four steps as follows: step one, standard rock cores are selected for the rock core holding units on two proportional arms and the rock core holding unit on a comparison arm; step two, a displacement experiment is performed and comprises the steps that the measurement device is assembled, the rock cores are mounted in the rock core holding units, and ring crush compression is applied, and a pressure pump performs pressing; step three, permeability of the standard rock cores in the rock core holding unit on the comparison arm is adjusted, and a pointer of the differential pressure gauge points to zero; and step four, data processing is performed, and related measurement data is substituted to an assigned data formula for calculating the rock core permeability. Compared with a traditional steady flow method for rock core permeability measurement, the technology can realize the rock core permeability measurement without flow measurement.

Description

technical field [0001] The invention relates to a permeability measurement technology, in particular to a bridge-like bridge-free measurement-free type rock core permeability cross-level measurement device and a bridge-imitation flow-free measurement-free rock core permeability step-level measurement method. Background technique [0002] In the traditional steady-state flow method to measure the core permeability experiment, the accurate measurement of the flow rate is often difficult, especially in the process of low-permeability, ultra-low-permeability, and tight core displacement experiments, or when the displacement environment is relatively harsh. Measurement accuracy is even more difficult to guarantee, and sometimes even impossible to measure, resulting in large errors or inability to measure parameters such as core permeability. For example, the measurement of rock permeability in tight reservoirs requires a very small liquid flow rate, and for a permeability of 1×10...

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Problems solved by technology

Another example is high temperature and high pressure, especially the existence of high temperature, which makes the expelled fluid exist in gas-liquid two-phase during the core displacement process. At present, the expelled fluid is mostly measured directly with an open small measuring cylinder, so that the capture and measurement of the gas phase cannot be realized; In addition, at high temperature, the liquid is volatile, so the measurement error of the liquid is relatively large.

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