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A core holder and core technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of inability to lengthen, low confining pressure of the holder, poor adjustability, etc.
Inactive Publication Date: 2015-10-28
CHINA UNIV OF PETROLEUM (BEIJING)
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[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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[0028] The embodiments of the present invention will be described in further detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.
[0029] In the description of the present invention, it should be noted that, unless otherwise stated, "a plurality" means two or more; the terms "upper", "lower", "left", "right", and "internal" "," "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and The description is simplified, rather than indicating or implying that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addit...
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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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