CN220084822U

CN220084822U - Core holder and core analysis system

Info

Publication number: CN220084822U
Application number: CN202321636837.6U
Authority: CN
Inventors: 李同顺; 杜克锋
Original assignee: Shaanxi Wuding Petroleum Technology Co ltd
Current assignee: Shaanxi Wuding Petroleum Technology Co ltd
Priority date: 2023-06-26
Filing date: 2023-06-26
Publication date: 2023-11-24
Anticipated expiration: 2033-06-26

Abstract

The disclosure provides a core holder and core analysis system, the core holder includes barrel, core storehouse head, core storehouse pressure cap, tapering cover, core gum cover, tapering cover. Core bin pressing caps are sleeved outside two ends of the core rubber sleeve, the core rubber sleeve is clamped and fixed by the two core bin pressing caps, core bin sealing heads extend outwards along the axis of the core rubber sleeve, and through holes penetrating through the outside are prefabricated in the core bin sealing heads along the axis. The core gum cover is cup jointed by sheath and copper sheathing and is constituteed, has the core storehouse to press the cap at the both ends overcoat of sheath, and two core storehouse press the cap and pass through connecting screw with sheath centre gripping fixedly, reduce the influence of core gum cover distortion, deformation to experimental data to, improve the reliability of core holder.

Description

Core holder and core analysis system

Technical Field

The disclosure relates to the technical field of shale gas exploitation, in particular to a core holder and a core analysis system.

Background

The rock core refers to underground rock which is picked up by a coring tool in the drilling process, and can be used for researching lithology, physical properties and oiliness. The core holder is a device for holding and protecting a rock sample and sealing a cylindrical surface or an end surface when a laboratory determines the seepage characteristic of the rock sample or carries out displacement experiments, and the end surface is generally a reserved end surface of a fluid inlet and outlet. The core body which is ground into a cylindrical shape or a rectangular shape is clamped through the core holder, and the porosity of the core can be detected by performing a displacement experiment in the core body, so that the fluid circulation capacity of the core can be determined.

The core holder is divided into a sand filling pipe holder and a ring pressing closed holder. The sand filling pipe type clamp mainly comprises a sealing ring, a sand filling pipe and an end face seal head. The ring pressing closed type clamp holder is made of stainless steel or polytetrafluoroethylene, and mainly comprises a sealing ring, a core rubber sleeve, a ring pressing bin, an end socket and an outer cover. When in use, the core is put into the cylinder, the core is clamped by the sealing heads at the two ends of the cylinder, and then the core is put into the holder.

In the related art, in the experiment preparation stage, measuring points and pipelines are required to be installed at different length positions of a core rubber sleeve, and after the taper sleeve, the core bin end socket and the filling core are pre-assembled in advance, the assembly is sent into a holder barrel to finish final assembly. Because the length of the core holder is longer, the deformation of the rubber sleeve is easy to occur to influence experimental data, so how to improve the reliability of the core holder becomes an important problem to be solved urgently.

Disclosure of Invention

In a first aspect, the present disclosure provides a core holder, the core holder comprising a barrel, a core bin head, a core bin press cap, a taper sleeve, and a core gum sleeve; the two ends of the core rubber sleeve are sleeved with the core bin pressing caps, the core rubber sleeve is clamped and fixed by the two core bin pressing caps, and the core bin sealing heads extend outwards along the axis of the core rubber sleeve;

the core rubber sleeve is formed by sleeving a sheath and a copper sleeve, the two ends of the sheath are sleeved with core bin pressing caps, the two core bin pressing caps clamp and fix the sheath through connecting screws, and the two ends in the sheath extend outwards along the axis respectively to form core bin sealing heads.

In one embodiment, the cylinder and the core gum cover form an annular pressure bin therebetween.

In one embodiment, the core bin head is prefabricated with a through hole penetrating through the outside along the axis.

In one embodiment, a taper sleeve is arranged between the core bin pressing cap and the core bin sealing head.

In one embodiment, the core bin seal head comprises a first seal head and a second seal head which are oppositely arranged, and a core to be measured is arranged between the first seal head and the second seal head.

In one embodiment, the core cap extends outwardly along the axis of the core sleeve.

In one embodiment, the core bin pressing cap comprises an inner pressing cap and an outer pressing cap.

In one embodiment, the internal pressure cap is sleeved on the core bin head, and the internal pressure cap and the core bin head are coaxial.

In one embodiment, the inner pressure cap is threadedly connected to the outer pressure cap, and the inner pressure cap and the outer pressure cap are coaxial.

In a second aspect, the present disclosure provides a core analysis system comprising a core holder of any one of the above.

In the embodiment of the disclosure, the core holder comprises a cylinder body, a core bin end socket, a core bin pressing cap, a taper sleeve, a core rubber sleeve and a taper sleeve. Core bin pressing caps are sleeved outside two ends of the core rubber sleeve, the core rubber sleeve is clamped and fixed by the two core bin pressing caps, core bin sealing heads extend outwards along the axis of the core rubber sleeve, and through holes penetrating through the outside are prefabricated in the core bin sealing heads along the axis. The core gum cover is cup jointed by sheath and copper sheathing and is constituteed, has the core storehouse to press the cap at the both ends overcoat of sheath, and two core storehouse press the cap and pass through connecting screw with sheath centre gripping fixedly, reduce the influence of core gum cover distortion, deformation to experimental data to, improve the reliability of core holder.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural diagram of a core holder according to an embodiment of the disclosure.

Fig. 2 is a schematic structural diagram of a core holder according to an embodiment of the disclosure.

Fig. 3 is a schematic structural diagram of a core holder according to an embodiment of the disclosure.

Reference numerals: the core rubber sleeve comprises a cylinder body 1, an outer pressing cap 2, an inner pressing cap 3, a first sealing structure 4, a first sealing head 5, a taper sleeve 6, a core rubber sleeve 7, a right pressing cap 8, a second sealing structure 9 and a second sealing head 10.

Detailed Description

The present utility model will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent. The exemplary embodiments of the present utility model and the descriptions thereof are used herein to explain the present utility model, but are not intended to limit the utility model.

In the embodiments of the present disclosure, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate an azimuth or a positional relationship based on that shown in the drawings, and are merely for convenience of description and to simplify the description, but do not indicate or imply that the apparatus or elements referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.

In order to ensure the well cementation quality, the filtration performance of the drilling fluid needs to be evaluated when the underground environment is simulated. In the fluid loss test of the columnar core, free water of the drilling fluid is controlled to permeate through the columnar core under the action of pressure difference, and the fluid loss of the drilling fluid in the core is obtained after weighing, so that a technical basis is provided for optimization of construction parameters.

And installing the core column in the rubber sleeve, after annular pressure is applied, drilling fluid passes through the end face of the core to realize core end face fluid loss, and a certain annular sealing pressure is applied to the annular sealing rubber sleeve to realize annular sealing of the core. The rubber sleeve tensioner is adopted to realize rubber sleeve sealing, the rubber sleeve tensioner needs to be sealed with the cavity of the clamp holder, and the clamp holder sealing head and the column rock pressing cap are adopted to realize the high-pressure sealing environment in the home automobile.

When the rock core is disassembled, the end enclosure at the rear end of the rock core fluid loss holder and the column rock pressure cap are disassembled, the upper end enclosure, the flange and the like of the vertical cylinder body part of the holder are disassembled, the rock core after fluid loss is taken out through a special tool, the taken out rock core is weighed and measured, the fluid loss is measured, and then the rock core is installed on a displacement fluid flushing device to evaluate the displacement efficiency.

In embodiments of the present disclosure, the same axial and radial pressure is applied to the rock sample end face and surrounding cylinder. The method is used for measuring the porosity volume compression rate and the porosity and the permeability of the rock sample under the overburden pressure, and performing displacement test of the full-diameter core.

Referring to fig. 1, an embodiment of the present disclosure provides a core holder, which includes a barrel 1, a core bin head, a core bin pressing cap, a taper sleeve 6, and a core gum sleeve 7; core bin pressing caps are sleeved outside two ends of the core rubber sleeve 7, and the core rubber sleeve 7 is clamped and fixed by the two core bin pressing caps. The core bin head extends outwards along the axis of the core gum cover 7.

In one embodiment, a taper sleeve 6 is arranged between the core bin pressing cap and the core bin sealing head; the rock core bin seal head comprises a first seal head 5 and a second seal head 10 which are oppositely arranged, and a rock core to be detected is arranged between the first seal head 5 and the second seal head 10.

In one embodiment, an annular pressing bin is formed between the cylinder body 1 and the core rubber sleeve 7, and a through hole communicated with the core bin and the outside is prefabricated in the core bin end socket along the axis. The core bin pressing cap comprises an outer pressing cap 2 and an inner pressing cap 3, the core bin sealing head is sleeved with the inner pressing cap 3 in a threaded connection with the outer pressing cap 2, and the inner pressing cap 3 is in threaded connection with the outer pressing cap 2.

Referring to fig. 1, a first end enclosure 5 and a second end enclosure 10 are oppositely arranged in a cylinder body 1, a taper sleeve 6 is arranged between an internal pressure cap 3 and the first end enclosure 5, and a core to be measured is arranged between the first end enclosure 5 and the second end enclosure 10.

In one embodiment, the core rubber sleeve 7 is formed by sleeving a sheath and a copper sleeve, core bin pressing caps are sleeved at two ends of the sheath, the two core bin pressing caps clamp and fix the sheath through connecting screws, and core bin sealing heads extend outwards along the axis at two ends in the sheath respectively.

In one embodiment, the core bin pressing cap comprises an inner pressing cap and an outer pressing cap; the inner pressure cap is sleeved on the core bin sealing head, and the inner pressure cap and the core bin sealing head are coaxial; the inner pressure cap is in threaded connection with the outer pressure cap, and the inner pressure cap and the outer pressure cap are coaxial.

In one embodiment, the joint of the first sealing head 5 and the inner pressure cap 3 is provided with a first sealing structure 4, and the joint of the second sealing head 10 and the right pressure cap 8 is provided with a second sealing structure 9.

Referring to fig. 2 and 3, embodiments of the present disclosure provide a core analysis system including a core holder as described in any one of the above. Laboratory core resistivity measurement is carried out by adopting a core resistivity measurement device, the core resistivity measurement device comprises a core holder, the core holder is columnar, electrode plates are arranged on two end faces of the core holder, and after the core is placed in the core holder, two ends of the core are contacted with the electrode plates, so that the core resistivity can be measured by the electrode plates.

Whether the end face of the core is well and stably contacted with the electrode of the holder has a great influence on the measurement result, a leather material with certain thickness and elasticity is generally adopted as an electrode gasket, and for a part of the end face, a flat core is difficult to grind, and the influence on the deviation of the resistivity test result caused by poor contact due to insufficient contact between the gasket and the core is great.

Rock wettability measurement is the fundamental experiment of petrophysical properties measurement, and core holders are typically used when rock wettability is measured by self-priming methods. In the related art, the plug in the existing core holder cannot be adjusted according to the length of the core, and when cores with different lengths are measured, different core holders need to be replaced, so that the experimental efficiency is reduced, and the experimental cost is increased.

The above description of various embodiments is intended to emphasize the differences between the various embodiments, which may be the same or similar with reference to each other. The features disclosed in the embodiments of the products provided by the utility model can be combined arbitrarily under the condition of no conflict to obtain new embodiments of the products.

The above-described product embodiments are merely illustrative, and for example, the division of units is merely a logical function division, and there may be other divisions in actual implementation, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface and the units may be electrically or mechanically coupled or communicatively coupled.

The description uses the phrase "in an embodiment" which may refer to one or more of the same or different embodiments. The terms "comprising," "including," "having," and the like, as used with respect to embodiments of the present disclosure, are synonymous. The ordinal adjectives "first", "second", and "third" merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

The foregoing is merely illustrative of specific embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any changes or substitutions within the technical scope of the present utility model should be covered by the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. The core holder is characterized by comprising a cylinder, a core bin end socket, a core bin pressing cap, a taper sleeve and a core rubber sleeve;

the two ends of the core rubber sleeve are sleeved with the core bin pressing caps, the core rubber sleeve is clamped and fixed by the two core bin pressing caps, and the core bin sealing heads extend outwards along the axis of the core rubber sleeve;

2. The core holder of claim 1, wherein the barrel and core sheath form an annular compression pocket therebetween.

3. The core holder according to claim 1, wherein the core head is preformed with a through hole along the axis that extends through the exterior.

4. The core holder of claim 1, wherein a taper sleeve is disposed between the core barrel cap and the core barrel head.

5. The core holder according to claim 1, wherein the core bin head comprises a first head and a second head which are oppositely arranged, and a core to be measured is arranged between the first head and the second head.

6. The core holder of claim 1, wherein the core cap extends outwardly along an axis of the core sleeve.

7. The core holder of claim 1, wherein the core barrel press cap comprises an inner press cap, an outer press cap.

8. The core holder of claim 7, wherein the inner pressure cap is sleeved on the core head, and the inner pressure cap and the core head are coaxial.

9. The core holder of claim 7, wherein the inner pressure cap is threadably coupled to the outer pressure cap, the inner pressure cap and the outer pressure cap being coaxial.

10. A core analysis system, comprising the core holder of any one of claims 1-9.