CN209799880U

CN209799880U - inside and outside thermal-insulated directly links type heat-insulated oil pipe

Info

Publication number: CN209799880U
Application number: CN201822208871.9U
Authority: CN
Inventors: 李太仁; 周振强; 杨益民; 张春生; 刘振森; 修瑜
Original assignee: Panjin Liaohe Oil Field Jin Huan Ltd Industrial Co
Current assignee: Panjin Liaohe Oil Field Jin Huan Ltd Industrial Co
Priority date: 2018-12-27
Filing date: 2018-12-27
Publication date: 2019-12-17
Anticipated expiration: 2028-12-27

Abstract

The utility model discloses an internal and external heat insulation direct connection type heat insulation oil pipe, which is characterized by comprising an inner pipe, a middle pipe and an outer pipe, wherein both ends of the middle pipe are respectively provided with an external thread and an internal thread, the inner hole of the middle pipe is provided with an inner pipe, the inner pipe is connected with the middle pipe in a welding mode, and the heat insulation material of the inner pipe is filled between the inner pipe and the middle pipe; the outer pipe is arranged on the outer circumference of the middle pipe, the two ends of the outer pipe and the two ends of the middle pipe are connected in a welding mode, the heat insulating material of the outer pipe is filled between the outer pipe and the middle pipe, and the outer circumference of the outer pipe is wound with a heat insulating layer. The design of the inner and outer double-layer heat insulation layers not only improves the heat insulation effect, reduces the heat energy loss and is beneficial to energy conservation and emission reduction, but also increases the bearing stress area and improves the connection strength.

Description

Inside and outside thermal-insulated directly links type heat-insulated oil pipe

Technical Field

The utility model relates to a petroleum viscous crude thermal recovery tubular product technical field, in particular to interior outer thermal-insulated directly links type heat-insulating oil pipe.

Background

The heavy oil resources in China are widely distributed, the heavy oil occupies a certain proportion in the petroleum yield in China, and the heavy oil yield of each oil field is also improved year by year. The heavy oil is mainly mined by a thermal mining method, which can be divided into steam huff and puff mining, steam flooding mining and steam assisted gravity flooding mining. The casing damage phenomenon of the thermal production well is very serious under the influence of high temperature. At present, most of the heavy oil thermal recovery oil fields in China use heat insulation oil pipes.

the traditional heat insulation oil pipe is provided with coupling type threads on an outer pipe, and the heat insulation oil pipe is connected through a coupling. The connecting part of the coupling belongs to a weak link in a heat insulation oil pipe column of a thermal production well, and accidents caused by problems at the connecting part are frequent in field use. The heat insulation pipe with the coupling is also found to be not ideal in heat insulation effect during use. And the traditional heat insulation pipe only adopts an inner heat insulation layer form, so that the heat insulation effect is poor, the heat loss is serious, and the requirements of deep wells and well conditions cannot be met. These problems are all the problems to be solved urgently in the field of heavy oil thermal recovery.

disclosure of Invention

The utility model aims at providing an interior outer thermal-insulated directly links type heat-insulating oil pipe.

In order to realize the purpose of the utility model, the utility model provides an internal and external heat insulation direct connection type heat insulation oil pipe which is characterized by comprising an inner pipe, an intermediate pipe and an outer pipe, wherein the two ends of the intermediate pipe are respectively provided with an external thread and an internal thread, the inner hole of the intermediate pipe is provided with the inner pipe, the inner pipe is connected with the intermediate pipe in a welding mode, and the heat insulation material of the inner pipe is filled between the inner pipe and the intermediate pipe;

The outer tube sets up in the outer circumference of intermediate pipe, and outer tube and intermediate pipe both ends adopt the welding form to link to each other, fill outer tube thermal insulation material in the middle of outer tube and the intermediate pipe, outer tube circumference winding one deck heat preservation, and intermediate pipe main aspects external diameter D become intermediate pipe specification external diameter D + outer pipe wall thickness t2x2+ heat preservation thickness t7x 2.

wherein the outer pipe and the middle pipe are both made of API 5CT standard petroleum pipes and are made of steel grade J55.

The tooth profile of the internal thread and the tooth profile of the external thread are of an identical round thread structure, the tooth height H is 1.75mm, the thread pitch P is 4.64mm, the tooth profile angle G is 60 degrees, and the taper is 0.125.

Wherein the heat insulating material filled between the outer pipe and the middle pipe is glass fiber, and the heat insulating material filled between the inner pipe and the middle pipe is aerogel felt.

Wherein the specification outer diameter d of the intermediate pipe is 88.9 +/-0.79 mm.

Compared with the prior art, the utility model has the advantages that,

1. The oil pipe round thread technology is mature, the machinability is good, the labor time is saved, and the cost is reduced; the quality control of large-scale production is guaranteed, and the popularization and development of products are facilitated;

2. The coupling-free direct connection type thoroughly solves the problems of failure and safety accidents caused by the adoption of the coupling, and greatly improves the safety and the overall quality level of the heat-insulating oil pipe column of the thermal production well;

3. The design of the inner and outer double-layer heat insulation layers not only improves the heat insulation effect and reduces the heat energy loss, but also is beneficial to energy conservation and emission reduction, and simultaneously increases the bearing stress area and improves the connection strength;

4. the outer heat insulation layer is adopted to ensure that the outer diameters of the whole tubular column are consistent after the inner thread and the outer thread are connected, so that the resistance of pulling out the tubular column is greatly reduced, the accident risks of sticking a drill and the like are reduced, and the safety production efficiency is improved;

5. Is particularly suitable for the working environment under the complex well conditions such as deep wells and the like, and is convenient to popularize and apply in industry.

drawings

Fig. 1 is a schematic structural view of the present invention;

Fig. 2 is a schematic view of the structure of the middle tube of the present invention;

fig. 3 is an enlarged schematic view of the structure of the outer tube of the present invention;

Fig. 4 is a schematic view of the thread profile structure of the present invention;

In the figure: 1. the heat insulation pipe comprises an inner pipe, a 2 outer pipe, a 3 intermediate pipe, a 4 external thread, a 5 inner pipe heat insulation material, a 6 internal thread, a 7 heat insulation layer, a 8 outer pipe heat insulation material, a P-thread pitch, an H-tooth height, a G tooth shape angle, a D intermediate pipe large end external diameter, a D intermediate pipe specification external diameter, a t2 outer pipe wall thickness and an t7. heat insulation layer thickness.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that "connected" and words used in this application to express "connected," such as "connected," "connected," and the like, include both direct connection of one element to another element and connection of one element to another element through another element.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when used in this specification the singular forms "a", "an" and/or "the" include "specify the presence of stated features, steps, operations, elements, or modules, components, and/or combinations thereof, unless the context clearly indicates otherwise.

it should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …", "above … …", "above … …", "above", and the like, may be used herein for ease of description to describe the spatial relationship of one component or module or feature to another component or module or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the component or module in use or operation in addition to the orientation depicted in the figures. For example, if a component or module in the figures is turned over, components or modules described as "above" or "above" other components or modules or configurations would then be oriented "below" or "beneath" the other components or modules or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The components or modules may also be oriented in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

as shown in fig. 1-4, the present application provides an internal and external heat insulation direct connection type heat insulation oil pipe, which comprises an inner pipe 1, an intermediate pipe 3 and an outer pipe 2, wherein both ends of the intermediate pipe 3 are respectively provided with an external thread 4 and an internal thread 6, the inner hole is provided with the inner pipe 1, the inner pipe 1 is connected with the intermediate pipe 3 in a welding manner, and the middle of the inner pipe 1 and the intermediate pipe 3 is filled with an inner pipe heat insulation material 5;

the outer tube 2 is arranged on the outer circumference of the middle tube 3, the outer tube 2 and the two ends of the middle tube 3 are connected in a welding mode, an outer tube heat insulation material 8 is filled between the outer tube 2 and the middle tube 3, a heat insulation layer 7 is wound on the outer circumference of the outer tube 2, and the outer diameter D of the large end of the middle tube 3 is equal to the outer diameter D of the middle tube specification, the outer tube wall thickness t2x2 and the heat insulation layer thickness t7x 2.

in addition, the outer pipe 2 and the middle pipe 3 are both made of API 5CT standard petroleum pipe materials and are made of steel grade J55.

the internal thread 6 and the external thread 4 have the same tooth profile, a tooth height H of 1.75mm, a pitch P of 4.64mm, a profile angle G of 60 °, and a taper of 0.125.

In addition, the heat insulating material filled between the outer pipe 2 and the intermediate pipe 3 is glass fiber, and the heat insulating material filled between the inner pipe 1 and the intermediate pipe 3 is aerogel felt.

The intermediate pipe has an outer diameter d of 88.9 ± 0.79 mm.

The application has the following effects:

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The direct-connection type heat-insulation oil pipe with the internal and external heat insulation is characterized by comprising an inner pipe (1), a middle pipe (3) and an outer pipe (2), wherein external threads (4) and internal threads (6) are respectively arranged at two ends of the middle pipe (3), the inner pipe (1) is arranged in an inner hole of the middle pipe, the inner pipe (1) is connected with the middle pipe (3) in a welding mode, and heat insulation materials (5) of the inner pipe are filled between the inner pipe (1) and the middle pipe (3);

Outer tube (2) set up in intermediate tube (3) outer circumference, and outer tube (2) and intermediate tube (3) both ends adopt the welding form to link to each other, fill outer tube thermal insulation material (8) in the middle of outer tube (2) and intermediate tube (3), and outer tube (2) outer circumference winding one deck heat preservation (7), and intermediate tube (3) main aspects external diameter D become intermediate tube specification external diameter D + outer pipe wall thickness t2x2+ heat preservation thickness t7x 2.

2. The inner and outer insulating direct connecting type insulating oil pipe as claimed in claim 1, wherein the outer pipe (2) and the middle pipe (3) are both API 5CT standard petroleum pipe and are of steel grade J55.

3. the internal-external heat insulation direct-connection type heat insulation oil pipe according to claim 1, wherein the teeth of the internal thread (6) and the external thread (4) are of an identical round thread structure, the tooth height H is 1.75mm, the thread pitch P is 4.64mm, the tooth form angle G is 60 degrees, and the taper is 0.125.

4. The internally and externally insulated direct-connected insulated oil pipe according to claim 1, wherein the insulation material filled between the outer pipe (2) and the intermediate pipe (3) is glass fiber, and the insulation material filled between the inner pipe (1) and the intermediate pipe (3) is aerogel blanket.

5. The insulated direct-connected oil pipe of claim 1, wherein the intermediate pipe has an outer diameter d of 88.9 ± 0.79 mm.