阅读说明：本技术 一种酸性天然气集输用柔性复合管层间气体排气装置及其安装方法 (Flexible composite pipe interlayer gas exhaust device for acid natural gas gathering and transportation and installation method thereof ) 是由 邹慈胜 张云 林豪 赵绍东 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种酸性天然气集输用柔性复合管层间气体排气装置,包含一平头芯管和一外丝芯管所述的外丝芯管通过一螺母与所述的平头芯管相连接,所述的外丝芯管与平头芯管上均设有一接头套筒,所述的接头套筒的侧壁上均设有若干排气通孔,所述的接头套筒的侧壁上均设有一可拆卸的排气阀连接套。本发明由于增加排气管路,将层间气由排气阀引出集中处理,克服了原初层间气排在土壤里或空气中环保隐患风险,具有结构设计合理、质量稳定、可靠实用的优点,完全能满足酸性天然气集输用柔性复合管层间气体排气的要求,避免停输时,夹层内气体压力大于内衬层外压能力坍塌失效的风险,以及酸性天然气中含有H2S等有毒气体,排气环保隐患风险。(The invention discloses a flexible composite pipe interlayer gas exhaust device for gathering and transporting acidic natural gas, which comprises a flat-head core pipe and an outer wire core pipe, wherein the outer wire core pipe is connected with the flat-head core pipe through a nut, the outer wire core pipe and the flat-head core pipe are both provided with a joint sleeve, the side wall of the joint sleeve is provided with a plurality of exhaust through holes, and the side wall of the joint sleeve is provided with a detachable exhaust valve connecting sleeve. The invention has the advantages of reasonable structural design, stable quality, reliability and practicality, can completely meet the requirement of interlayer gas exhaust of the flexible composite pipe for gathering and transporting the acid natural gas, avoids the risk that the gas pressure in the interlayer is greater than the collapse and failure of the inner pressure capability outside the inner liner when the transportation is stopped, and avoids the risk of exhaust environmental protection hidden trouble because the acid natural gas contains toxic gases such as H2S and the like.)

1. The interlayer gas exhaust device for the flexible composite pipe for acid natural gas gathering and transportation is characterized by comprising a flat-head core pipe (8) and an outer wire core pipe (13),

the outer wire core pipe (13) is connected with the flat head core pipe (8) through a nut (14), a gasket (15) is arranged between the outer wire core pipe (13) and the flat head core pipe (8),

the outer wire core pipe (13) and the flat head core pipe (8) are both provided with a joint sleeve (2), the side wall of the joint sleeve (2) is provided with a plurality of exhaust through holes (1S), the side wall of the joint sleeve (2) is provided with a detachable exhaust valve connecting sleeve (4), the exhaust valve connecting sleeve (4) is provided with a set screw (7), the exhaust valve connecting sleeve (4) is provided with a rotatable sliding sleeve (3),

the exhaust valve connecting sleeve (4) is provided with an exhaust valve (5), a pair of short sections (11) and a three-way quick connector (10) are arranged between the exhaust valves (5), and an exhaust pipe (9) is arranged on the bypass side of the three-way quick connector (10).

2. The flexible composite pipe interlayer gas exhaust device for gathering and transporting the acidic natural gas as claimed in claim 1, wherein the outer circle of the exhaust valve connecting sleeve (4) is conical, a plurality of sealing circular grooves are formed in the inner hole of the exhaust valve connecting sleeve (4), and O-shaped rings (6) are arranged in the sealing circular grooves.

3. The flexible composite pipe interlayer gas exhaust device for gathering and transporting the acid natural gas as claimed in claim 1, wherein the sliding sleeve (3) is annular, and an inner hole of the sliding sleeve (3) has a self-locking taper.

4. The flexible composite pipe interlayer gas exhaust device for gathering and transporting the acidic natural gas as claimed in claim 1, wherein the exhaust valve (5) is a spring type exhaust valve.

5. The flexible composite pipe interlayer gas exhaust device for gathering and transporting the acidic natural gas as claimed in claim 1, wherein the exhaust valve connecting sleeve (4) and the sliding sleeve (3) are self-locked by adopting a taper of 2.5-3.5 degrees.

6. The method for installing the gas exhaust device between the flexible composite pipes for sour natural gas gathering and transportation according to claim 1, comprising the steps of:

step S1, prefabricating 1-3 exhaust through holes (1S) on the surface of the joint sleeve (2) according to requirements;

step S2, installing the joint sleeve (2) on the outer surface of the composite pipe (1);

s3, pressing the flat-head core pipe (8) and the outer wire core pipe (13) into the inner hole of the corresponding composite pipe (1) respectively;

s4, expanding the inner diameters of the flat core tube (8) and the outer wire core tube (13);

step S5, buckling the outer surface of the joint sleeve (2);

step S6, installing an O-shaped ring (6) on the joint sleeve (2);

step S7, installing the exhaust valve connecting sleeve (4) on the joint sleeve (2), and firstly fixing by hand;

step S8, sleeving the sliding sleeve (3) on the exhaust valve connecting sleeve (4), paying attention to the taper direction, and rotating the direction of the exhaust valve connecting sleeve (4) and the direction of the sliding sleeve (3) to enable the exhaust through hole (1S) to be vertically upward;

step S9, knocking the end face of the sliding sleeve (3) by a hammer to lock the taper of the sliding sleeve (3) and the exhaust valve connecting sleeve (4);

step S10, tightening one of the set screws (7) and preliminarily fixing the exhaust valve connecting sleeve (4);

step S11, installing a gasket (15) in the sealing groove of the outer core wire tube (13), and screwing a nut (14);

step S12, installing an exhaust valve (5), a short joint (11) and a three-way quick connector (10) on the exhaust valve connecting sleeve (4), screwing another set screw (7) and fixing the exhaust valve connecting sleeve (4);

and step S13, inserting an exhaust pipe (9) into the hole of the three-way quick coupling (10).

Technical Field

The invention relates to a natural gas conveying device, in particular to a flexible composite pipe interlayer gas exhaust device for acid natural gas gathering and transportation.

Background

The flexible composite high-pressure delivery pipe (hereinafter referred to as flexible composite pipe) has the performances of corrosion resistance, high pressure resistance, swelling resistance, good flexibility, long single pipeline, less used pipe fittings, simple construction, long service life and good economy, and is widely applied to oil and gas fields.

The flexible composite pipe adopts a multilayer composite structure and comprises an inner liner layer, a reinforcing layer and an outer protective layer. The inner liner layer is made of high molecular polymer resin materials, and has a gas permeation characteristic due to the molecular structure characteristics, when acid natural gas is conveyed, if conveying media contain more small molecular gases such as CH4, CO2 and H2S, the small molecular acid gases can enter the flexible composite pipe interlayer through a permeation effect, a large amount of permeation gases in the interlayer are gathered, when the conveying is stopped, the permeation gas pressure in the interlayer is larger than the pressure bearing capacity of the inner liner layer, the inner liner layer is caused to collapse, and the composite pipe is made to fail.

In order to prevent the accumulation of gas in the pipe clamping layer of the flexible composite pipe, an exhaust valve is usually arranged on the end joint of the pipe body of the flexible composite pipe, the exhaust valve is directly communicated with the interlayer, and the exhaust valve is automatically opened under the preset pressure of 0.2-0.3MPa to exhaust the gas accumulated in the interlayer.

At the present stage, the exhaust valve is directly screwed on the internal thread on the outer surface of the joint sleeve, but when the joint is installed on the composite pipe, the sleeve needs to be sleeved on the composite pipe for buckling, if the internal thread is prefabricated on the outer surface of the sleeve, the internal thread deforms after being extruded during buckling, and the exhaust valve cannot be screwed on. In order to mount the vent valve smoothly, the outer surface of the sleeve can only be drilled and tapped again after crimping. Due to the fact that the positions of the joints of the coils are different, drilling and tapping are conducted on the outer surface of the sleeve, only manual operation can be conducted, a drill bit or a screw tap can be broken in the hole without paying attention, meanwhile, three screw holes are usually needed to be tapped in consideration of the unreeling direction (vertical placement and horizontal placement) of the coils, and one screw hole is installed while the other screw hole is reserved. When the composite pipe is installed and connected, one of the screw holes facing upwards is selected to install the exhaust valve, and the other two holes are plugged by the screw plugs. Even so, can not guarantee also that the discharge valve is vertical upwards, if the discharge valve is if not vertical upward installation, then easily cause the discharge valve case card to die, can not normally exhaust or close.

Disclosure of Invention

The invention mainly solves the technical problems in the prior art, and provides a flexible composite pipe interlayer gas exhaust device for acid natural gas gathering and transportation.

The technical problem of the invention is mainly solved by the following technical scheme:

an acid natural gas gathering and transportation flexible composite pipe interlayer gas exhaust device is characterized by comprising a flat-head core pipe and an outer wire core pipe,

the outer wire core pipe is connected with the flat head core pipe through a nut, a gasket is arranged between the outer wire core pipe and the flat head core pipe,

the outer wire core pipe and the flat core pipe are both provided with a joint sleeve, the side walls of the joint sleeves are both provided with a plurality of exhaust through holes, the side walls of the joint sleeves are both provided with a detachable exhaust valve connecting sleeve, the exhaust valve connecting sleeve is both provided with a set screw, the exhaust valve connecting sleeve is provided with a rotatable sliding sleeve,

the exhaust valve connecting sleeve is provided with an exhaust valve, a pair of short sections and a three-way quick connector are arranged between the exhaust valves, and an exhaust pipe is arranged on the bypass side of the three-way quick connector.

As a better embodiment of the invention, the excircle of the exhaust valve connecting sleeve is conical, the inner hole of the exhaust valve connecting sleeve is provided with a plurality of sealing circular grooves, and O-shaped rings are arranged in the sealing circular grooves.

As a preferred embodiment of the invention, the sliding sleeve is annular, and an inner hole of the sliding sleeve has self-locking taper.

As a preferred embodiment of the present invention, the exhaust valve is a spring-type exhaust valve.

As a better embodiment of the invention, the exhaust valve connecting sleeve and the sliding sleeve are self-locked by adopting 2.5-3.5 degrees of conicity.

An installation method of the gas exhaust device between the flexible composite pipes for acid natural gas gathering and transportation comprises the following steps:

step S1, prefabricating 1-3 exhaust through holes on the surface of the joint sleeve according to requirements;

step S2, installing the joint sleeve on the outer surface of the composite pipe;

step S3, pressing the flat-head core tube and the outer wire core tube into the inner holes of the corresponding composite tubes respectively;

step S4, expanding the inner diameters of the flat core tube and the outer wire core tube;

step S5, buckling the outer surface of the connector sleeve;

step S6, installing an O-shaped ring on the joint sleeve;

step S7, mounting the exhaust valve connecting sleeve on the joint sleeve, and fixing by hand;

step S8, sleeving the sliding sleeve on the exhaust valve connecting sleeve, paying attention to the direction of the taper, and rotating the exhaust valve connecting sleeve and the sliding sleeve to enable the exhaust through hole to be vertically upward;

step S9, knocking the end face of the sliding sleeve by a hammer to lock the taper of the sliding sleeve and the exhaust valve connecting sleeve;

step S10, tightening one of the set screws to preliminarily fix the exhaust valve connecting sleeve;

step S11, installing a gasket in the sealing groove of the outer wire core pipe, and screwing a nut;

step S12, installing an exhaust valve, a short joint and a three-way quick joint on the exhaust valve connecting sleeve, screwing up another set screw, and fixing the exhaust valve connecting sleeve;

and step S13, inserting an exhaust pipe into the middle hole of the three-way quick joint.

The flexible composite pipe interlayer gas exhaust device for gathering and transporting the acidic natural gas has the following advantages:

1. because the screw hole is prefabricated on the exhaust valve connecting sleeve, the defects of inconvenience in site drilling and tapping, drill bit breakage and screw cone breakage are overcome, and the installation efficiency and the product quality are improved;

2. the direct assembly, the circumferential rotation and the screw fastening are adopted, the defects of standby drilling of multiple screw holes and inclination of the exhaust valve position are overcome, the drilling and tapping time is saved, the standby plugs are reduced, and meanwhile, the interlayer gas is discharged in time;

3. increase the exhaust pipe, draw forth the gas between the layer by discharge valve and concentrate on handling, overcome former gas between the primary layer and discharged in soil or environmental protection hidden danger risk in the air, have that structural design is reasonable, steady quality, reliable practical advantage. The requirement of gas exhaust between the flexible composite pipe layers for gathering and transporting the acid natural gas can be completely met, the risk that the gas pressure in the interlayer is greater than the collapse failure of the external pressure capacity of the inner lining layer when the gathering and transporting are stopped is avoided, and the acid natural gas contains toxic gases such as H2S and the like, so that the risk of potential hazards of exhaust and environmental protection is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic perspective view of the flexible composite pipe interlayer gas exhaust device for acid natural gas gathering and transportation according to the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.

As shown in figure 1, the flexible composite pipe interlayer gas exhaust device for acid natural gas gathering and transportation comprises a flat-head core pipe 8 and an outer wire core pipe 13.

The outer wire core tube 13 is connected with the flat-head core tube 8 through a nut 14, and a gasket 15 is arranged between the outer wire core tube 13 and the flat-head core tube 8.

The outer wire core pipe 13 and the flat core pipe 8 are both provided with a joint sleeve 2, the side wall of the joint sleeve 2 is provided with an exhaust hole 1S, the side wall of the joint sleeve 2 is provided with a detachable exhaust valve connecting sleeve 4, the exhaust valve connecting sleeve 4 is provided with a set screw 7, and the exhaust valve connecting sleeve 4 is provided with a rotatable sliding sleeve 3.

An exhaust valve 5 is arranged on each exhaust valve connecting sleeve 4, a pair of short joints 11 and a three-way quick connector 10 are arranged between the exhaust valves 5, and an exhaust pipe 9 is arranged on the bypass side of the three-way quick connector 10.

The excircle of this discharge valve adapter sleeve 4 is the toper, and the hole of this discharge valve adapter sleeve 4 is equipped with a plurality of sealed circular slots, is equipped with O type circle 6 in this sealed circular slot.

The sliding sleeve 3 is annular, and an inner hole of the sliding sleeve 3 has self-locking taper.

The exhaust valve 5 is a spring-type exhaust valve. The exhaust valve connecting sleeve 4 and the sliding sleeve 3 are self-locked by adopting 2.5-3.5 degrees of conicity.

The following description is about the installation mode of the gas exhaust device between the flexible composite pipes for acid natural gas gathering and transportation, and the installation mode comprises the following steps:

step S1, prefabricating 1-3 exhaust through holes 1S on the surface of the joint sleeve 2 according to requirements;

step S2, installing the joint sleeve 2 on the outer surface of the composite pipe 1;

step S3, pressing the flat-head core tube 8 and the outer wire core tube 13 into the inner holes of the corresponding composite tubes 1 respectively;

step S4, expanding the inner diameter of the flat core tube 8 and the outer wire core tube 13;

step S5, buckling the outer surface of the joint sleeve 2;

step S6, installing an O-shaped ring 6 on the joint sleeve 2;

step S7, mounting the exhaust valve connecting sleeve 4 on the joint sleeve 2, and fixing by hand;

step S8, sleeving the sliding sleeve 3 on the exhaust valve connecting sleeve 4, paying attention to the taper direction, and rotating the exhaust valve connecting sleeve 4 and the sliding sleeve 3 to enable the exhaust through hole 1S to be vertically upward;

step S9, knocking the end face of the sliding sleeve 3 by a hammer to lock the taper of the sliding sleeve 3 and the exhaust valve connecting sleeve 4;

step S10, tightening one of the set screws 7, and preliminarily fixing the exhaust valve connecting sleeve 4;

step S11, installing a gasket 15 in the sealing groove of the outer core wire tube 13, and screwing the nut 14;

step S12, installing an exhaust valve 5, a short joint 11 and a three-way quick connector 10 on the exhaust valve connecting sleeve 4, screwing another set screw 7, and fixing the exhaust valve connecting sleeve 4;

step S13 is to insert the exhaust pipe 9 into the hole of the three-way quick coupling 10.

This acid natural gas gathering is defeated with flexible composite pipe interlaminar gaseous exhaust apparatus has following advantage:

1. because the screw hole is prefabricated on the exhaust valve connecting sleeve, the defects of inconvenience in site drilling and tapping, drill bit breakage and screw cone breakage are overcome, and the installation efficiency and the product quality are improved;

2. the direct assembly, the circumferential rotation and the screw fastening are adopted, the defects of standby drilling of multiple screw holes and inclination of the exhaust valve position are overcome, the drilling and tapping time is saved, the standby plugs are reduced, and meanwhile, the interlayer gas is discharged in time;

3. increase the exhaust pipe, draw forth the gas between the layer by discharge valve and concentrate on handling, overcome former gas between the primary layer and discharged in soil or environmental protection hidden danger risk in the air, have that structural design is reasonable, steady quality, reliable practical advantage. The requirement of gas exhaust between the flexible composite pipe layers for gathering and transporting the acid natural gas can be completely met, the risk that the gas pressure in the interlayer is greater than the collapse failure of the external pressure capacity of the inner lining layer when the gathering and transporting are stopped is avoided, and the acid natural gas contains toxic gases such as H2S and the like, so that the risk of potential hazards of exhaust and environmental protection is avoided.

Without being limited thereto, any changes or substitutions that are not thought of through the inventive work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.