Rock core capillary self-absorption simulation instrument and application method thereof

Abstract

The invention discloses a rock core capillary self-absorption simulation instrument. The instrument comprises a rock core holder, the rock core holder is connected to a confining pressure pump by a third electric control valve, and a second pressure meter is arranged between the rock core holder and the third electric control valve; one end of the rock core holder is connected to a back pressure value, and the other end of the rock core holder is connected to an intermediate container with scale through a second electric control valve and a fluid flowmeter in order; the intermediate containerwith scale is connected to a pressure apparatus though a first electric control valve, and a first pressure meter is arranged between the intermediate container with scale and the first electric control valve; the first electric control valve, the second electric control valve and the third electric control valve are connected to an apparatus for controlling system as well as acquiring and processing data. The instrument can simulate the capillary self-absorption process under the conditions of overbalance, underbalance, and near-balance of stratum; a computer is used in an experiment processfor realizing processing automation of test and data results, in order to obtain self-absorption speed and intrusion depth and other parameters of capillary, and better simulate self-absorption of rock core.

Description

technical field [0001] The invention relates to the field of simulated rock core self-absorption, in particular to a rock core capillary self-absorption simulator and a use method thereof. Background technique [0002] At present, the core self-absorption rate is usually measured by the intelligent LCR measuring instrument to measure the change of core resistivity during the core self-priming process to determine the invasion depth. Balanced capillary self-priming capacity; the existing equipment cannot measure the under-balanced capillary self-priming capacity of the formation, and cannot evaluate the reverse osmosis process of the liquid accumulation in the wellbore of the old well; the core wall is prone to self-priming during the testing process of the existing capillary self-priming simulator Errors are caused to the experimental test results, and the capillary self-absorption capacity of the core end face cannot be accurately described. Contents of the invention [...

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Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a core capillary self-priming simulator and its use method to solve the problem of poor simulation effect of existing simulated core self-priming equipment

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