Loose sandstone sample packaging method for electrical property determination

Abstract

The invention discloses a loose sandstone sample packaging method for electrical property determination. The method is mainly characterized in that the circumferential surface of a loose sandstone sample is wrapped by first insulation teflon adhesive tape, a first metallic tin sleeve, second insulation teflon adhesive tape and a second metallic tin sleeve in sequence, and stainless steel meshes are fixed to the two end faces of the loose sandstone sample, wherein the middle of the first metallic tin sleeve is broken to form a gap, and the first metallic tin sleeve is completely covered with the second insulation teflon adhesive tape. By means of the method, the loose sandstone sample can be better protected and solidified, it is guaranteed that the two end faces of the sample are insulated and the sample is resistant to solvent cleaning, elastic deformation caused by other materials and influences on the pore structure of rock from adhesives dissolved in a solvent are avoided, in this way, electrical property determination data are closer to actual conditions of a stratum, and the technical problems that insulation, solidification and solvent cleaning resistance of the loose sandstone sample are difficult to achieve in electrical property determination sample treatment in the field of researching the rule of changing of the electrical properties of a reservoir stratum rock before and after water flooding are solved.

Description

technical field [0001] The invention relates to a sample processing method for measuring the resistivity of loose sandstone rocks, in particular to a method for encapsulating loose sandstone samples. Background technique [0002] With the in-depth exploitation of oil in the Bohai Sea area, the unconsolidated sandstone-based reservoirs urgently need to be explored experimentally. Especially for the later stages of water flooding in oil fields, knowing the distribution of remaining oil in reservoirs before and after water flooding can effectively guide the adjustment of water flooding oil and gas field development plans. At the same time, most of the oilfield reservoirs discovered and evaluated in Bohai area in recent years have the characteristics of medium-high porosity and permeability. In some oilfields, due to the shallow depth of reservoirs and loose lithology, the core samples are easy to loose, out of shape, and poor in cementation, which brings great difficulties to ...

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Problems solved by technology

[0005] What the present invention aims to solve is that the sample existing in the above-mentioned existing loose sandstone sample encapsulation method is easily polluted by colloid, the elastic deformation property of the plastic material is easy to affect the pore structure of the sample, the contact between the end surface of the sample and the measuring electrode is poor, and it is not resistant to solvent cleaning, etc. The technical problem is to provide a loose sandstone sample encapsulation method for electrical property determination, which can better protect and consolidate the loose sandstone sample, ensure the insulation of the two ends of the sample and the resistance of the sample to solvent cleaning, and avoid other The elastic deformation brought by the material and the influence of the colloid being easily dissolved in the solvent on the pore structure of the rock make the electrical measurement data closer to the actual situation of the formation

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