Heat insulation sleeve structure for petroleum logging instrument

Abstract

The utility model relates to the technical field of petroleum logging instruments, and discloses a heat insulation sleeve structure for a petroleum logging instrument, which comprises a heat insulation shell, a tubular inner heat insulation layer coaxial with the heat insulation shell is arranged on the inner side of the heat insulation shell, a heat insulation cavity is formed between the inner heat insulation layer and the heat insulation shell, and an air hole communicated with the heat insulation cavity is further formed in the top of the heat insulation shell. Through the arrangement of the heat insulation shell and the inner heat insulation layer, heat transfer can be effectively prevented, and heat insulation protection is provided for the logging instrument; the heat insulation cavity can be vacuumized through the air holes, so that heat conduction and heat convection are effectively reduced, and the heat insulation performance of the heat insulation structure is improved; through the arrangement of the first sealing end cover and the second sealing end cover, the sealing effect on the heat insulation cavity is achieved; the sealing ring tightly wraps the outer wall of the logging instrument body, heat can be effectively prevented from permeating from the two ends of the heat insulation structure, and the sealing performance is improved. The problems that the thermal resistance of a traditional heat insulation sleeve structure is rapidly reduced at high temperature, and the actual heat insulation efficiency is seriously reduced compared with a theoretical value are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to petroleum logging instrument technical field, concretely relates to a heat -insulated sleeve structure for petroleum logging instrument. BACKGROUND

[0002] In the process of oil exploration and development, logging instrument is the "eyes" of core parameters such as formation lithology, porosity, oil and gas saturation, and its working stability directly determines the reliability of exploration data. Downhole temperature gradient can reach 30-50 ℃ / km, in deep well or ultra-deep well environment, instrument needs to bear 175 ℃ or more continuous high temperature, extreme working condition even more than 260 ℃. This extreme thermal environment can lead to electronic component parameter drift, sensor sensitivity decline, carbonization failure of insulating materials and other problems, reduce the signal-to-noise ratio of measurement, and seriously shorten the service life of instrument. Taking logging cable as an example, continuous high temperature can accelerate the aging of polyurethane sheath, and make its tensile strength decrease sharply, which directly threatens the safety of downhole operation.

[0003] Therefore, it is necessary to protect the petroleum logging instrument by using the heat insulation sleeve structure, and the existing heat insulation sleeve structure adopts a vacuum sandwich or aerogel filling scheme, but the sealing system has structural defects. The traditional metal-rubber composite sealing ring is prone to thermal creep at high temperature, resulting in a large compression permanent deformation rate, which causes a gap of 0.1-0.3mm at the sealing interface, forming a heat convection channel. The multi-layer winding type heat insulation structure adopts adhesive connection at the interlayer bonding surface, and the adhesive strength will drop sharply above 150 ℃, and the interlayer thermal resistance will decrease rapidly. More importantly, the traditional design does not consider the thermal stress coupling effect, and the micron-level gap between the heat insulation sleeve and the instrument body due to the difference in material thermal expansion coefficient (CTE mismatch) will evolve into a millimeter-level thermal bridge in repeated thermal cycles, which seriously reduces the actual thermal insulation efficiency compared with the theoretical value, and seriously restricts the deep oil and gas resource exploration ability.

[0004] Based on this, the utility model provides a heat insulation sleeve structure for petroleum logging instrument to solve the problems existing in the prior art. Utility model content

[0005] Therefore, the main purpose of the utility model is to provide a heat insulation sleeve structure for petroleum logging instrument to solve the problems of traditional heat insulation sleeve structure, such as rapid heat resistance reduction at high temperature and serious actual thermal insulation efficiency reduction compared with the theoretical value.

[0006] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0007] The utility model provides a kind of heat insulation sleeve structure for petroleum logging instrument, including the heat insulation shell matched with logging instrument main body, the inside of the heat insulation shell is provided with the inner heat insulation layer of coaxial cylinder, and the heat insulation cavity is formed between inner heat insulation layer and heat insulation shell, and the air hole is also opened in the top of the heat insulation shell, and the air hole is communicated with heat insulation cavity.

[0008] In a preferred embodiment, the top end of the heat insulation shell is provided with a sealing end cap one, and the bottom end of the heat insulation shell is also provided with a sealing end cap two.

[0009] In a preferred embodiment, the bottom of the sealing end cap one is provided with a sealing rod, which is inserted inside the air hole.

[0010] In a preferred embodiment, the sealing end cap one and the sealing end cap two are provided with fluororubber sealing rings on opposite sides, and the inner ring wall of the sealing ring is attached to the outer wall of the logging instrument main body.

[0011] In a preferred embodiment, the surface of the sealing ring is processed with a micro-taper self-tightening sealing lip, and the sealing lip is attached to the outer wall of the logging instrument main body.

[0012] In a preferred embodiment, the heat insulation shell is provided with a sealing groove at both ends, and the outer ring wall of the sealing ring is in contact with the inner wall of the sealing groove.

[0013] In a preferred embodiment, the heat insulation shell is provided with equidistantly distributed fixing grooves at both ends, and the inner wall of the fixing groove is provided with internal threads for threaded connection with a fixing screw.

[0014] In a preferred embodiment, the sealing end cap one and the sealing end cap two are provided with equidistantly distributed connecting holes, and the connecting end head is arranged inside the connecting hole, the fixing screw is arranged at the end of the connecting end head, and is in threaded connection with the fixing groove.

[0015] In a preferred embodiment, the heat insulation shell is made of high-strength alloy material and has a cylindrical structure.

[0016] In a preferred embodiment, the inner heat insulation layer is a nano-aerogel heat insulation component with low thermal conductivity.

[0017] Compared with the prior art, the heat insulation sleeve structure for petroleum logging instrument has the following beneficial effects:

[0018] 1. The heat insulation shell and the inner heat insulation layer can effectively prevent heat transfer and provide good heat insulation protection for the logging instrument.

[0019] 2. The gas hole can be set to extract the heat insulation cavity into vacuum in use, the vacuum environment can greatly reduce heat conduction and heat convection, and the heat insulation performance of the heat insulation structure is further improved;

[0020] 3. The sealing rod is inserted into the gas hole by fixing and installing the sealing end cover one and the sealing end cover two at the two ends of the heat insulation shell, and the sealing effect of the heat insulation cavity is formed;

[0021] 4. The sealing ring is tightly wrapped on the outer wall of the logging instrument main body, heat can be effectively prevented from penetrating from the two ends of the heat insulation structure, the sealing performance is improved, and the heat insulation effect is ensured. The problems of the traditional heat insulation sleeve structure that the heat resistance decreases rapidly at high temperature and the actual heat insulation efficiency is seriously reduced compared with the theoretical value are solved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 It is a whole structure schematic view of the heat insulation sleeve structure for the petroleum logging instrument of the present application;

[0024] Figure 2 It is a heat insulation shell structure schematic view of the heat insulation sleeve structure for the petroleum logging instrument of the present application;

[0025] Figure 3 It is a sectional structure schematic view of the heat insulation shell, the sealing end cover one and the sealing end cover two of the heat insulation sleeve structure for the petroleum logging instrument of the present application;

[0026] Figure 4 It is a sectional structure schematic view of the heat insulation shell of the heat insulation sleeve structure for the petroleum logging instrument of the present application;

[0027] Figure 5 It is a structure schematic view of the sealing end cover one of the heat insulation sleeve structure for the petroleum logging instrument of the present application;

[0028] Figure 6 It is a local sectional structure schematic view of the connection between the heat insulation shell and the sealing end cover one of the heat insulation sleeve structure for the petroleum logging instrument of the present application;

[0029] Figure 7 It is a local enlarged view of A in the present application. Figure 3

[0030]

MAIN COMPONENT SYMBOL DESCRIPTION

[0031] 1, heat insulation shell; 2, logging instrument main body; 3, sealing end cover one; 4, sealing end cover two; 5, sealing ring; 6, connecting end head; 7, inner heat insulation layer; 8, heat insulation cavity; 9, air hole; 10, sealing rod; 11, fixing screw rod; 12, sealing groove; 13, fixing groove; 14, connecting hole. DETAILED DESCRIPTION

[0032] The structure of the heat insulation sleeve structure for the petroleum logging instrument will be further explained in detail below in combination with the drawings and the embodiments of the present application.

[0033] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflicts. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0034] It should be noted that the terms used herein are only for describing the specific embodiments, and are not intended to limit the exemplary embodiments of the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or their combinations.

[0035] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units listed, but can include other steps or units not listed or inherent to these processes, methods, products or devices.

[0036] For purposes of the description hereinafter, spatial relations terms are used, such as "above", "below", "top", "bottom", "side", "higher", "lower", and the like, relative to the device as shown in the figures. It is to be understood that the spatial terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device is inverted consistent with its being inverted, a device described as "above" or "up" other devices or structures would then be oriented "below" or "down" the other devices or structures. Accordingly, the exemplary term "above" can encompass both an orientation of above and below. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein interpreted accordingly.

[0037] As shown in the accompanying drawings for Figures 1-7 The utility model provides a technical scheme:

[0038] A kind of heat shield sleeve structure for petroleum logging instrument, including the heat shield shell 1 being installed on the outside of logging instrument main body 2, and with logging instrument main body 2 is matched, coaxial inner heat insulation layer 7 of fixed installation is formed between the outer side wall of inner heat insulation layer 7 and the inner side wall of heat shield shell 1, and in use, the inner wall of inner heat insulation layer 7 and the outer wall of logging instrument main body 2 are contacted, heat shield shell 1 is fixedly installed on the outside of logging instrument main body 2 in use, the transmission of heat can be effectively prevented by the inner heat insulation layer 7 set, logging instrument main body 2 is provided with good heat insulation protection, and at the same time, the inner heat insulation layer 7 can limit and protect logging instrument main body 2. The top of heat shield shell 1 is also provided with air hole 9, the air hole 9 is communicated with heat shield cavity 8, for being extracted into vacuum inside heat shield cavity 8 by the air hole 9 set in use, vacuum environment can greatly reduce heat conduction and heat convection, and it is favorable to further improve the heat insulation performance of heat insulation structure, and low thermal conductivity material can also be filled into heat shield cavity 8 through air hole 9, to improve the heat insulation effect of heat shield shell 1.

[0039] In the above description, the heat shield shell 1 is a cylindrical structure made of high-strength alloy material. The annular vacuum heat shield cavity 8 formed by the double-layer composite structure of the heat shield shell 1 and the high-temperature-resistant inner heat insulation layer 7 can block the heat convection and heat conduction path by using the vacuum environment while achieving radial limiting and physical protection in use, specifically: the vacuum cavity 8 is extracted to a high vacuum state (≤1×10 -3Pa), which can make the thermal resistance increase by 3-5 orders of magnitude; meanwhile, the heat insulation cavity 8 can be used as a filling channel to inject low-thermal-conductivity medium such as nano-aerogel or composite phase change material, and a gradient heat insulation system is constructed through the synergistic effect of the material properties and the vacuum environment. The inner heat insulation layer 7 is made of nano-aerogel heat insulation material, which has extremely low thermal conductivity and can effectively prevent heat transfer, thereby providing good heat insulation protection for the logging instrument main body 2. The heat insulation sleeve structure with the above-mentioned modular design can make the effective thermal resistance of the heat insulation sleeve be ≤0.05 W / (m·K) in a wide temperature range of -40℃ to 260℃, which is more than 60% higher than the heat insulation efficiency of the traditional single-layer structure, and at the same time meets the requirements of anti-impact (≥500g) and corrosion resistance (H2S concentration 5% environment) in the downhole, thereby significantly prolonging the working life of the logging instrument main body 2 in high-temperature and high-pressure wells.

[0040] In a preferred embodiment, as shown in Figure 3 、 Figure 4 and Figure 6 , the top end of the heat insulation shell 1 is provided with a sealing end cover one 3, the bottom of the sealing end cover one 3 is mounted with a sealing rod 10, the sealing rod 10 is inserted inside the air hole 9, and the sealing rod 10 is used to close the air hole 9 during use to ensure the vacuum environment in the heat insulation cavity 8 or to prevent the outflow of the low-thermal-conductivity medium in the heat insulation cavity 8.

[0041] In a preferred embodiment, as shown in Figure 3 、 Figure 4 and Figure 6 , the bottom end of the heat insulation shell 1 is also provided with a sealing end cover two 4, and the opposite sides of the sealing end cover one 3 and the sealing end cover two 4 are fixedly mounted with high-temperature-resistant fluororubber sealing rings 5. The sealing end cover one 3 and the sealing end cover two 4 are fixedly mounted at the two ends of the heat insulation shell 1, the sealing rings 5 can tightly wrap the outer wall of the logging instrument main body 2 during use, a radial sealing interface can be formed through the interference fit of the double O-rings, and heat penetration from the two ends of the heat insulation structure can be effectively prevented, which is conducive to improving the sealing performance.

[0042] Specifically, as shown in Figure 3 、 Figure 4 、 Figure 6 and Figure 7 , the sealing ring 5 adopts a metal framework support structure, the surface is processed with a micro-taper (1:50) self-tightening sealing lip, and under the action of the pre-tightening force of the fixing screw 11 for mounting the sealing end cover one 3 and the sealing end cover two 4, the sealing ring 5 can produce an elastic deformation of 3-5 mm, thereby forming a continuous metal-nonmetal composite sealing band with the outer wall of the logging instrument main body 2, and the axial heat conduction path can be effectively blocked.

[0043] Specifically, as shown in Figure 1 、 Figure 2 、 Figure 3 ,Figure 4 , Figure 5 and Figure 6 As shown, several sealing grooves 12 are provided at both ends of the heat insulation shell 1. The outer wall of the sealing ring 5 is in close contact with the inner wall of the sealing groove 12, and the inner wall of the sealing ring 5 is in close contact with the outer wall of the logging instrument body 2.

[0044] In a preferred embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, both ends of the heat insulation shell 1 are provided with equidistantly distributed fixing grooves 13. The inner wall of the fixing groove 13 is provided with internal threads. Both the sealing end cap 1 3 and the sealing end cap 2 4 are provided with equidistantly distributed connecting holes 14. The inner side of the connecting hole 14 is provided with a connecting end head 6. The end of the connecting end head 6 is fixedly connected with a fixing screw 11. The fixing screw 11 is screwed into the inner wall of the fixing groove 13. The sealing end cap 1 3 and the sealing end cap 2 4 are fixedly installed at both ends of the heat insulation shell 1 by the fixing screw 11 and the fixing groove 13.

[0045] The implementation principle of the heat insulation jacket structure for oil well logging instruments described in this embodiment is as follows:

[0046] In practical use, the heat insulation shell 1 is fixedly installed on the outside of the logging instrument body 2. An inner heat insulation layer 7, made of nano-aerogel material with extremely low thermal conductivity, effectively prevents heat transfer, providing excellent heat insulation protection for the logging instrument body 2. Then, the heat insulation cavity 8 is evacuated to a vacuum through the provided vents 9. This vacuum environment significantly reduces heat conduction and convection, further improving the heat insulation performance of the structure. Finally, sealing end caps 1 and 2 are fixedly installed at both ends of the heat insulation shell 1 using fixing screws 11 and fixing grooves 13. The sealing rod 10 is inserted into the vents 9, forming a seal on the heat insulation cavity 8. Simultaneously, the sealing groove 12 ensures that the sealing ring 5 tightly wraps around the outer wall of the logging instrument body 2, effectively preventing heat penetration from both ends of the heat insulation structure and improving sealing performance.

[0047] It should be noted that the main body 2 of the logging instrument includes commonly used electrical logging instruments, acoustic logging instruments, nuclear logging instruments, geophysical logging instruments and directional logging instruments in logging engineering, all of which are existing technologies known to those skilled in the art and will not be described in detail here.

[0048] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A heat insulation jacket structure for an oil well logging instrument, characterized in that, The application relates to a heat-insulating casing (1) matched with a logging instrument body (2), wherein a coaxial cylindrical inner heat-insulating layer (7) is arranged on the inner side of the heat-insulating casing (1), a heat-insulating cavity (8) is formed between the inner heat-insulating layer (7) and the heat-insulating casing (1), and an air hole (9) is arranged on the top of the heat-insulating casing (1) and communicates with the heat-insulating cavity (8).

2. The heat shield structure for a petroleum logging instrument according to Claim 1, wherein The top end of the heat-insulating casing (1) is provided with a sealing end cover one (3), and the bottom end of the heat-insulating casing (1) is provided with a sealing end cover two (4).

3. A thermal barrier sleeve structure for a petroleum logging instrument as defined in claim 2, wherein The bottom of the sealing end cover one (3) is provided with a sealing rod (10) which is inserted into the air hole (9).

4. The heat shield structure for a petroleum logging instrument as recited in claim 2, wherein The opposite sides of the sealing end cover one (3) and the sealing end cover two (4) are provided with fluorine rubber sealing rings (5), and the inner ring wall of the sealing ring (5) is attached to the outer wall of the logging instrument body (2).

5. A thermal barrier sleeve structure for a petroleum logging instrument as defined in claim 4, wherein The surface of the sealing ring (5) is processed with a micro-taper self-tightening sealing lip which is attached to the outer wall of the logging instrument body (2).

6. A thermal barrier sleeve structure for a petroleum logging instrument as defined in claim 4, wherein The two ends of the heat-insulating casing (1) are provided with sealing grooves (12), and the outer ring wall of the sealing ring (5) is in contact with the inner wall of the sealing groove (12).

7. A heat shield structure for a petroleum logging instrument as defined in claim 2, wherein The two ends of the heat-insulating casing (1) are provided with equidistantly distributed fixing grooves (13), and the inner wall of the fixing groove (13) is provided with an inner thread which is threadedly connected with a fixing screw rod (11).

8. A thermal barrier sleeve structure for a petroleum logging instrument as defined in claim 7, wherein The sealing end cover one (3) and the sealing end cover two (4) are provided with equidistantly distributed connecting holes (14), the connecting holes (14) are provided with connecting end heads (6), the fixing screw rod (11) is arranged at the end of the connecting end head (6) and is threadedly connected with the fixing groove (13).

9. The heat shield structure for a petroleum logging instrument as recited in claim 1, wherein The heat-insulating casing (1) is a high-strength alloy material component and has a cylindrical structure.

10. The heat shield structure for a petroleum logging instrument as recited in claim 1, wherein The inner heat-insulating layer (7) is a nano aerogel heat-insulating component with low thermal conductivity.

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