Core holding unit

Abstract

The invention relates to the technical field of rock electrical measurement equipment, specifically to a core holding unit. The core holding unit comprises a barrel and a rubber sleeve. The inside of the rubber sleeve is a clamping cavity. An annular pressure cavity is formed between the barrel and the rubber sleeve. An annular pressure inlet, an exhaust port and a water outlet on the barrel are respectively communicated with the annular pressure cavity. Two ends of the rubber sleeve are provided with a left core plug and a right core plug for sealing the clamping cavity. Two ends of the barrel are used for sealing a left end cap and a right end cap of the annular pressure cavity. a left pressing cap used for fixing the left core plug and the left end cap and a right pressing cap used for fixing the right core plug and the right end cap are respectively clamped on the outside of two ends of the barrel. The core holding unit also contains several pressure sensors which are used for measuring pressure applied on a core test-piece. The invention provides a core holding unit capable of changing length of the rubber sleeve through changing pressure applied on the rubber sleeve and measuring the magnitude of pressure applied on a test piece to be tested, thus making experiment effects to be better.

Description

Technical field [0001] The invention relates to the technical field of rock electrical measuring devices, in particular to a core holder, and more particularly to a high-pressure core holder with a variable length. Background technique [0002] At present, in the prior art, the general core holder is mainly composed of the following parts: left core plug, left pressure cap, taper sleeve, sealing ring, fluororubber rubber sleeve, dead core, right fixed cap, right core plug , Adjusting bracket, adjusting nut, etc. This holder has a simple structure, and its measurable core length is up to 1 meter, and can be used to measure core axial permeability, core saturated oil, water, high-pressure oil displacement, and other models with φ25 cores. During the experiment, the displacement pressure ranged from 0 to 30 MPa, and the ring pressure ranged from 0 to 35 MPa. [0003] However, due to structural limitations, the core holder in the prior art has the following shortcomings: 1. Once the ...

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Problems solved by technology

[0003] However, due to structural limitations, the core holder in the prior art has the following disadvantages: 1. Once the core holder is ready, it can only be used for the rock core of the specified length of the core holder, and its adjustability is poor; 2. Due to the limitation of the core holder by the rubber sleeve, the longest length of the currently used core holder can only be 1 meter, which cannot be extended; 3. The confining pressure of the holder is low

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