Field seal-storing method and device of fine-grained rock core

Abstract

The invention discloses a field seal-storing method and device of a fine-grained rock core. The method comprises the steps of taking out a core, wiping off sealing liquid on the surface of the core, and removing the surface part, impregnated by the sealing liquid, of the core; tightly wrapping the core of the above step with plastic wrap; wrapping the plastic wrap with tin foil, and wrapping the tin foil tightly with polytetrafluoroethylene; loading an obtained sample into a heat-insulating cotton bag, and sealing for tightening; adding the sample of step D into thawed paraffin solution, taking out after a first preset time, and soaking in cold water; after a second preset time, taking out the sample from the cold water, and judging whether wax seal is complete; if yes, putting the samplein a sample bag. The method of the invention is suitable for long-range transportation and long-term preservation of samples and is applicable to the preservation of low-porosity low-permeability cores of mud shale, siltstone and the like.

Description

technical field [0001] The invention relates to petroleum exploration technology, in particular to an on-site sealing method and an on-site sealing device for processing volatile and easily oxidizable fine-grained rock core samples. Background technique [0002] Petroleum geological experimental analysis has become an important means of quantitative understanding in the field of oil and gas. In recent years, low porosity and permeability mud shale and tight siltstone have become important research objects in unconventional oil and gas exploration. For such low porosity and permeability samples, it is often necessary to carry out analysis experiments such as oil content, gas permeability, porosity, etc., such as oil content analysis and GRI analysis, which require relatively high freshness of samples, and often need to be sent to the laboratory for work. Long-distance transportation and high sealing requirements, how to achieve safe transportation, ensure that the core fluid...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the inadequacy of being unable to realize on-site storage of fine-grained rock cores in the prior art, embodiments of the present invention provide a method for on-site storage of fine-grained rock cores, comprising the following steps:

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