阅读说明：本技术 用于水下管道预调试注水的降压限流装置 (Pressure-reducing and flow-limiting device for pre-debugging water injection of underwater pipeline ) 是由 宋春娜 叶永彪 高磊 杨志彬 张捷 王超 余承龙 蒋兵兵 吕小翔 曹聚杭 唐豫 于 2019-01-29 设计创作，主要内容包括：本发明涉及一种用于水下管道预调试注水的降压限流装置,包括主体管段,以及安装在所述主体管段内的限流组件。所述限流组件上形成有供水流过所述主体管段的限流通道；所述主体管段的侧壁上设有用于获取所述限流通道内压力的取压口。降压限流装置可以安注在注水装置上,通过选用带有不同规格限流通道的限流组件,可调节不同压降及流量,适用于不同水深不同规格海底管道预调试自由注水作业,维护成本低、安装方便。(The invention relates to a pressure reduction and flow limiting device for pre-debugging water injection of an underwater pipeline, which comprises a main pipe section and a flow limiting assembly arranged in the main pipe section. A flow limiting channel for water to flow through the main body pipe section is formed on the flow limiting assembly; and a pressure taking port for acquiring the pressure in the flow limiting channel is arranged on the side wall of the main body pipe section. The pressure reduction and flow limiting device can be safely injected on a water injection device, different pressure drops and flow rates can be adjusted by selecting the flow limiting assemblies with flow limiting channels of different specifications, the device is suitable for pre-debugging free water injection operation of submarine pipelines of different water depths and different specifications, the maintenance cost is low, and the installation is convenient.)

1. A pressure reduction and flow limiting device for pre-debugging water injection of an underwater pipeline is characterized by comprising a main body pipe section (1) and a flow limiting assembly (2) arranged in the main body pipe section (1);

A flow limiting channel (A) for water to flow through the main pipe section (1) is formed on the flow limiting assembly (2);

and a pressure taking port (11) for acquiring the pressure in the flow limiting channel (A) is arranged on the side wall of the main body pipe section (1).

2. The depressurising flow-restricting device for pre-commissioning flooding of an underwater pipeline according to claim 1, characterized in that the flow-restricting assembly (2) is removably mounted within the main body pipe section (1), the flow-restricting assembly (2) comprising a number of flow-restricting plates (21) arranged axially within the main body pipe section (1);

the flow limiting plates (21) are provided with flow limiting ports (22), and the flow limiting ports (22) on the flow limiting plates (21) are communicated to form the flow limiting channel (A).

3. The pressure reduction and flow restriction device for pre-debugging water injection of an underwater pipeline according to claim 2, wherein the flow restriction plate (21) comprises a cylindrical body (211) and a base plate (212), the periphery of the base plate (212) is connected with the periphery of the cylindrical body (211), the main pipe section (1) is sleeved on the outer ring of the cylindrical body (211), and the flow restriction ports (22) are through holes formed in the corresponding base plate (212).

4. Pressure reducing and flow limiting device for pre-commissioning water injection of underwater pipelines according to claim 2, characterized in that the end edge of the restriction (22) is chamfered.

5. The pressure reducing and flow limiting device for pre-debugging water injection of an underwater pipeline as claimed in claim 2, wherein pressure taking holes (213) communicated with the pressure taking ports (11) are formed in the side wall of the cylindrical body (211) of part or all of the flow limiting plate (21).

6. Pressure reducing and flow restricting device for pre-commissioning flooding of a subsea pipeline according to any one of claims 2 to 5, characterized in that the flow restricting assembly (2) comprises a first flow restricting plate (21 a) and a second flow restricting plate (21 b) with different numbers of flow restricting ports (22), the first flow restricting plate (21 a) and the second flow restricting plate (21 b) being axially alternated within the main pipe section (1).

7. The pressure reducing and flow restricting device for pre-debugging water injection of an underwater pipeline according to claim 6, characterized in that the flow restricting ports (22) on the first flow restricting plate (21 a) and the flow restricting ports (22) on the second flow restricting plate (21 b) are arranged in a staggered manner.

8. The pressure reducing and flow limiting device for pre-regulated water injection of underwater pipelines according to claim 6, wherein at least one size of flow limiting port (22) is distributed on each first flow limiting plate (21 a) and each second flow limiting plate (21 b).

9. The pressure reducing and flow limiting device for pre-debugging water injection of the underwater pipeline according to any one of claims 1 to 5, further comprising a front pipe section (3) and a rear pipe section (4) which are respectively connected and communicated with two ends of the main pipe section (1), wherein the aperture of the front pipe section (3) and the aperture of the rear pipe section (4) are smaller than the aperture of the main pipe section (1).

10. The pressure reducing and flow limiting device for pre-debugging water injection of underwater pipeline according to claim 9, characterized in that it further comprises a front flared neck section (5) connected between said main body pipe section (1) and said front pipe section (3), and a rear flared neck section (6) connected between said main body pipe section (1) and said rear pipe section (4), wherein the inner diameter of said front flared neck section (5) near said front pipe section (3) is smaller than the inner diameter near said main body pipe section (1), and the inner diameter of said rear flared neck section (6) near said rear pipe section (4) is smaller than the inner diameter near said main body pipe section (1).

Technical Field

The invention relates to the field of marine oil and gas field development, in particular to a pressure reduction and flow limiting device for pre-debugging water injection of an underwater pipeline.

Background

In the process of marine oil and gas field development, pre-debugging operation is required before the production of a submarine pipeline, the construction progress and the completion quality of a newly-built pipeline are ensured, the method mainly comprises the procedures of water injection, pipe cleaning, diameter measurement, pressure test, drainage, drying, inerting and the like, and the water injection operation is an important part in the pre-debugging operation of the submarine pipeline.

The shallow water submarine pipeline water injection operation usually adopts a pump station positioned on a production platform or an engineering ship to inject water, the deepwater submarine pipeline water injection operation greatly increases the difficulty, the cost and the like due to the influence of the water depth by adopting a water surface pump station water injection mode, and the operation mode of freely injecting water by utilizing seawater at the bottom is favored due to the convenience, high efficiency, low cost, reduction of heat exchange time and the like.

The problems of large pressure difference, difficult flow control and the like exist in deep sea underwater free water injection, particularly, high-pressure sea water is freely injected into a sea floor pipeline, and high-speed fluid generated by high pressure drop easily erodes the pipeline and equipment to cause abrasion and damage; meanwhile, the flow requirements are different when submarine pipelines with different water depths and specifications are debugged, and the flow control is a difficult problem.

Disclosure of Invention

The invention aims to solve the technical problem of providing a pressure reduction and flow limitation device for pre-debugging water injection of an underwater pipeline.

The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a pressure reduction and flow limiting device for pre-debugging water injection of an underwater pipeline, which comprises a main body pipe section and a flow limiting assembly arranged in the main body pipe section;

a flow limiting channel for water to flow through the main body pipe section is formed on the flow limiting assembly;

And a pressure taking port for acquiring the pressure in the flow limiting channel is arranged on the side wall of the main body pipe section.

Preferably, the flow restricting assembly is detachably mounted in the main body pipe section, and comprises a plurality of flow restricting plates arranged in the main body pipe section along the axial direction;

The flow limiting plates are provided with flow limiting ports, and the flow limiting ports on the flow limiting plates are communicated to form the flow limiting channel.

Preferably, the flow restriction plate comprises a cylindrical body and a base plate, the periphery of the base plate is connected with the periphery of the cylindrical body, the main pipe section is sleeved on the outer ring of the cylindrical body, and the flow restriction ports are through holes formed in the corresponding base plate.

Preferably, the end edge of the flow restriction is provided with a chamfer.

Preferably, pressure taking holes communicated with the pressure taking ports are formed in the side wall of the cylindrical body of part or all of the flow limiting plates.

preferably, the flow restricting assembly comprises a first flow restricting plate and a second flow restricting plate with different numbers of flow restricting ports, and the first flow restricting plate and the second flow restricting plate are alternately arranged in the axial direction in the main pipe section.

Preferably, the flow restricting ports on the first flow restricting plate and the second flow restricting plate are arranged in a staggered manner.

Preferably, at least one size of restriction opening is distributed on each first restriction plate and each second restriction plate.

Preferably, the pressure-reducing flow-limiting device for pre-debugging water injection of the underwater pipeline further comprises a front pipe section and a rear pipe section which are respectively connected and communicated with two ends of the main pipe section, and the aperture of each of the front pipe section and the rear pipe section is smaller than that of the main pipe section.

Preferably, the pressure-reducing flow-limiting device for pre-debugging water injection of the underwater pipeline further comprises a front neck-expanding section connected between the main pipe section and the front pipe section and a rear neck-expanding section connected between the main pipe section and the rear pipe section, wherein the inner diameter of the front neck-expanding section close to the front pipe section is smaller than the inner diameter of the rear neck-expanding section close to the main pipe section, and the inner diameter of the rear neck-expanding section close to the rear pipe section is smaller than the inner diameter of the rear neck-expanding section close to the main pipe section.

The pressure reduction and flow limiting device for pre-debugging water injection of the underwater pipeline has the following beneficial effects: the pressure reduction and flow limiting device can be safely injected on a water injection device, different pressure drops and flow rates can be adjusted by selecting the flow limiting assemblies with flow limiting channels of different specifications, the device is suitable for pre-debugging free water injection operation of submarine pipelines of different water depths and different specifications, the maintenance cost is low, and the installation is convenient.

drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic cross-sectional view of a pressure-reducing and flow-limiting device for pre-debugging water injection of an underwater pipeline in an embodiment of the invention;

Fig. 2 is a schematic cross-sectional view of the restrictor plate of fig. 1.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1, the pressure reducing and flow limiting device for pre-regulated water injection of an underwater pipeline in a preferred embodiment of the present invention includes a main body pipe section 1, and a flow limiting assembly 2 installed in the main body pipe section 1, wherein a flow limiting channel a for water to flow through the main body pipe section 1 is formed in the flow limiting assembly 2. Furthermore, a pressure taking port 11 for obtaining the pressure in the flow limiting passage a is arranged on the side wall of the main body pipe section 1.

The pressure reduction and flow limiting device can be safely injected on a water injection device, different pressure drops and flow rates can be adjusted by selecting the flow limiting assembly 2 with the flow limiting channels A of different specifications, the device is suitable for pre-debugging free water injection operation of submarine pipelines of different water depths and different specifications, the maintenance cost is low, and the installation is convenient.

The pressure reduction and flow limitation device also comprises a front pipe section 3, a rear pipe section 4, a front neck expanding section 5 and a rear neck expanding section 6; the front pipe section 3 and the rear pipe section 4 are respectively positioned at two ends of the main body pipe section 1 and are connected and communicated with the main body pipe section 1, furthermore, the front neck expanding section 5 is connected between one end of the main body pipe section 1 and the front pipe section 3, and the rear neck expanding section 6 is connected between the other end of the main body pipe section 1 and the rear pipe section 4.

In some embodiments, two adjacent parts of the main pipe section 1, the front pipe section 3, the rear pipe section 4, the front flared neck section 5 and the rear flared neck section 6 are connected through flanges, so that the disassembly and the assembly are convenient. In other embodiments, two adjacent components can be connected by screwing, and the front pipe section 3 and the front neck-expanding section 5, and the rear pipe section 4 and the rear neck-expanding section 6 can be connected by welding.

Preferably, the aperture of the front pipe section 3 and the aperture of the rear pipe section 4 are smaller than that of the main body pipe section 1, so that the pressure reduction and the flow restriction can be facilitated after water flows into the main body pipe section 1. Further, the inner diameter of the front neck expanding section 5 close to the front pipe section 3 is smaller than the inner diameter of the rear neck expanding section 6 close to the rear pipe section 4, and the inner diameters of the front neck expanding section 5 and the rear neck expanding section 6 are smaller than the inner diameter of the main pipe section 1.

The structure at both ends of main part pipeline section 1 is all the dismouting, does benefit to the dismouting change of inside current-limiting assembly 2, is applicable to the step-down demand of different demands, and the aperture of preceding pipeline section 3, back pipeline section 4 all is less than the aperture of main part pipeline section 1.

Preferably, the flow restricting assembly 2 is detachably installed in the main body pipe section 1, and the flow restricting assembly 2 of flow restricting passages a of different specifications can be disassembled and replaced under the condition that the main body pipe section 1 is not changed.

Referring to fig. 1 and 2, in some embodiments, the flow restricting assembly 2 includes a plurality of flow restricting plates 21 axially arranged in the main pipe section 1, each flow restricting plate 21 is provided with a flow restricting opening 22, the flow restricting openings 22 of the flow restricting plates 21 are communicated to form a flow restricting passage a, and the flow rate and the pressure drop can be adjusted according to the size and the number of the flow restricting openings 22 and the arrangement of the flow restricting plates 21.

Further, the restrictor plate 21 includes a cylindrical body 211 and a base plate 212, the circumference of the base plate 212 is connected with the circumference of the cylindrical body 211, the main pipe section 1 is sleeved on the outer ring of the cylindrical body 211, and the restrictor 22 is a through hole formed on the corresponding base plate 212.

preferably, the outer ring of the cylindrical body 211 is sealed with the inner wall surface of the main body pipe section 1, and the end surfaces of two adjacent cylindrical bodies 211 in the axial direction are also sealed, so that the influence of the outward flow of water on the accuracy of the measured pressure and flow is avoided. The multistage depressurization flow limiting plate 21 is directly stacked in the axial direction, the installation space is reduced, and the multistage depressurization flow limiting plate is small in structural length, detachable and replaceable.

In order to measure the pressure in the restriction passage a, the side wall of the cylindrical body 211 of the partial restrictor plate 21 is provided with a pressure measuring hole 213 communicating with the pressure measuring port 11, so that the internal pressure at the corresponding position can be measured. In general, the pressure-taking holes 213 may be provided at intervals in the cylindrical bodies 211 arranged in the axial direction, or the pressure-taking holes 213 may be provided in the side walls of the cylindrical bodies 211 of all the restrictor plates 21.

Further, in order to facilitate the flow-limiting and pressure-reducing, the flow-limiting assembly 2 includes first and second flow-limiting plates 21a and 21b with different numbers of flow-limiting ports 22, and the first and second flow-limiting plates 21a and 21b are alternately arranged in the axial direction in the main pipe section 1.

In some embodiments, the first flow restriction plate 21a is provided with a flow restriction port 22, the second flow restriction plate 21b is provided with a plurality of flow restriction ports 22, and the flow restriction ports 22 on the first flow restriction plate 21a and the flow restriction ports 22 on the second flow restriction plate 21b are arranged in a staggered manner, so that the flowing medium can be dispersed to flow, and the pressure can be reduced step by step. The number of the upper restricting ports 22 of the first and second flow restricting plates 21a, 21b may be other numbers, and the flow restricting ports may be configured to reduce the pressure and restrict the flow when the water flows through.

When the first flow restriction plate 21a and the second flow restriction plate 21b are provided with a plurality of flow restriction ports 22, at least one size of the flow restriction ports 22 may be distributed on each of the first flow restriction plate 21a and the second flow restriction plate 21b, and the same flow restriction plate 21 may also be provided with the flow restriction ports 22 of various sizes, so that the positions of the flow restriction plates 21 and the sizes of the flow restriction ports 22 may be combined to meet the corresponding requirements for pressure reduction and flow restriction.

The flow limiting plates 21 in the pressure reduction and flow limiting device are replaced by the combined installation of the flow limiting plates 21, and after specific combination, serialization is formed, so that the device is suitable for pre-debugging free water injection operation of submarine pipelines with different water depths and different specifications.

Preferably, a chamfer is arranged at the end edge of the flow restriction opening 22, so that the water flows more smoothly after the chamfer is processed, the cavitation influence is avoided, and the pressure and the flow are distorted.

In other embodiments, the flow restricting assembly 2 may also be a cylinder structure passing through the main pipe section 1, and the flow restricting passage a is a flow groove formed on the outer wall surface of the main structure. Alternatively, the restricted flow passage a may be formed by splicing at least two components side by side.

it is to be understood that the above-described respective technical features may be used in any combination without limitation.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.