Determination method for permeability of core matrix

Abstract

The invention discloses a determination method for the permeability of a core matrix. The determination method comprises the following steps: (a) firstly, preparing a flowing medium for later use; (b) preparing a core to be tested for later use; (c) extruding a certain quantity of the flowing medium into the core from a reversed end of a core clamping device and carrying out displacement, wherein the flowing speed of the flowing medium is lower than a critical flowing speed; (d) carrying out the displacement until the flow and the pressure difference are stable, wherein the stable time is not less than 50-70 minutes; (e) enabling the flowing medium of a water injection well to enter the core from an entrance of the positive end of the core clamping device; and (f) collecting the volume of the flowing medium passing through the core, and comparing the initial use quantity of the flowing medium with the volume of the flowing medium passing through the core so as to obtain the permeability of the core matrix. The determination method can be used for rapidly determining the permeability of the core matrix; the testing result is accurate and the testing steps are simple; the determination method is convenient to operate and the testing cost of the permeability of the core matrix is greatly reduced.

Description

technical field [0001] The invention relates to a method for measuring the permeability of a rock core matrix. Background technique [0002] Rock core, according to the needs of geological exploration work or engineering, using annular core drill bit and other coring tools, cylindrical rock samples taken from the hole. The ore-bearing rock or ore taken from the ore body or bed of a solid mineral is called the core. Cores are important physical geological data for studying and understanding underground geology and mineral conditions. [0003] In the process of mineral exploration and development, it is necessary to carry out drilling and drilling according to the stratum level and depth of the geological design, lower the coring tool into the well, and drill out the rock samples. Core is the most intuitive and practical data to understand the characteristics of underground strata and ore-bearing. There are two methods of sidewall coring and drilling coring, and the latter ...

AI Technical Summary

Problems solved by technology

A high recovery rate means that many samples are taken out of the borehole, which to a certain extent indicates that the operation method is good and the technical level is high; a low recovery rate means that the formation has been drilled through, but few samples are taken out, which to a certain extent indicates that the drilling method is good. The quality of the work is poor, the operation method is wrong, and the technical level is low

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