Oil and gas pipeline insulation fixed thrust pipe pier, design and manufacturing method and application thereof

Abstract

The invention provides an oil and gas pipeline insulation fixing thrust pipe pier and a design and manufacturing method and application thereof. The oil and gas pipeline insulation fixing thrust pipe pier comprises a polypropylene sleeve arranged on the peripheral face of an oil and gas pipeline in a sleeving mode; the loose flange is fastened on the peripheral surface of the polypropylene sleeve; and concrete is cast in place around the polypropylene sleeve, the loose flange and the oil and gas pipeline to form a concrete pier, so that the polypropylene sleeve, the loose flange and the oil and gas pipeline are wrapped and fixed in the concrete pier. The polypropylene sleeve is arranged on the oil and gas pipeline in a sleeving mode, the outer surface of the oil and gas pipeline is protected by means of the polypropylene sleeve, the loose flange is arranged on the polypropylene sleeve in a sleeving mode, a conventional reinforcing sleeve is replaced by the loose flange, and the fixed thrust baffle, the reinforcing rib plate, the polypropylene sleeve and the loose flange are all finished products. The tedious steps of cutting, machining, rust removing, welding, nondestructive testing and the like of metal prefabricated parts in a prefabrication factory or a construction site are omitted, design is innovative, and the construction period is shortened.

Description

Technical Field

[0001] The invention belongs to the field of pipeline ancillary facilities, and in particular relates to an insulated fixed thrust pipe pier for an oil and gas pipeline, a design and manufacturing method and an application thereof. Background Art

[0002] Insulated fixed thrust pipe piers are widely used in oil and gas storage and transportation, oil and gas field surface engineering, municipal heating and gas pipeline networks, etc., especially as one of the ancillary facilities to ensure the safe operation of oil and gas pipelines. They play a very important role in the construction and operation and maintenance of oil and gas pipelines. Generally, fixed piers are set at the entrance and exit of each oil and gas pipeline and at both ends.

[0003] Fixed piers are facilities set up according to the results of pipeline stress analysis and calculation to prevent the pipeline from moving in the horizontal and vertical directions due to the axial force generated by internal pressure or temperature. They are generally cast with concrete. The technical principle of fixed piers is:

[0004] Oil and gas pipelines are affected by internal pressure and temperature changes, which will generate axial stress and push equipment, bends, etc., causing pipeline deformation or instability. In severe cases, the pipeline may be directly broken. Therefore, it is necessary to set fixed piers according to calculations in the line project to reduce the effect of axial stress, limit pipeline displacement or ensure pipeline stability. The fixed pier is made of concrete or reinforced concrete. The pipeline is connected to the concrete pier through a metal prefabricated thrust piece, which evenly transmits the thrust to the fixed pier. The fixed pier uses the passive earth pressure and friction generated by the soil on the fixed pier to reduce the thrust.

[0005] The existing fixed pier design and production method is as follows:

[0006] (1) The fixed pier is calculated, designed and selected by the design institute based on the pipeline stress analysis. The fixed pier design includes two parts: metal prefabricated parts and concrete piers. Figure 1 , the design of metal prefabricated parts includes reinforcing sleeves, fixed thrust baffles, reinforcing ribs, etc., forming a general design drawing for pipeline process professionals to select and use. (2) The fixed pier pipe section is generally prefabricated in the prefabrication factory or on-site. The size, specification and material of the metal prefabricated parts are cut and processed on-site according to the design documents. The reinforcing sleeve is made of two semicircular pipe clamps tightly against the pipeline and continuously butt-welded. The fixed thrust baffle and reinforcing rib plate are double-sided continuous welded. The butt welding of the fixed thrust baffle and the reinforcing sleeve must be staggered with the weld of the reinforcing rib plate, and the weld must be non-destructively tested. (3) The surface of the metal prefabricated parts in the prefabrication factory is sandblasted and rust-proofed to Sa2.5 level, and the surface is coated with epoxy resin for corrosion protection. It is shipped after passing the electric spark leak detection. (4) The fixed pier pipe section is transported to the pipeline construction site, assembled and installed in place, and C30 concrete is poured on site.

[0007] The structure of the existing fixed pier is shown in Figure 1 , also refer to the patent publication number CN 209067950 U.

[0008] There are some problems with the existing fixed pier design methods on the market, such as complicated production steps and inconsistent requirements, which are specifically manifested as follows:

[0009] The existing design method of fixed piers is out of date. After the design of the metal prefabricated parts is completed, the steel pipes used to reinforce the metal prefabricated parts are cut, derusted, welded and non-destructively tested according to the design size; the steel plates used to fix the thrust baffles and reinforcing ribs are cut, derusted, welded and non-destructively tested according to the design size. There are technical differences in the fixed piers designed by various design institutes. The metal prefabricated parts, as the force transmission structure of the fixed piers, have different sizes, specifications and materials. The technical requirements for cutting, derusting, welding, testing and anti-corrosion in the prefabrication plant or on-site are also inconsistent, and they are generally not considered for application in non-metallic pipes. Moreover, this design method has been used for more than 20 years, following the previous technical route, which makes innovation difficult and difficult to solve the outstanding problems faced. It is necessary to adopt fundamental and revolutionary thinking to break the status quo and explore new technical paths. Summary of the invention

[0010] The purpose of the present invention is to provide an insulated fixed thrust pipe pier for an oil and gas pipeline, a design and manufacturing method and an application thereof, so as to overcome the above-mentioned technical defects.

[0011] In order to solve the above technical problems, the present invention provides an insulated fixed thrust pipe pier for oil and gas pipelines, which comprises:

[0012] A polypropylene sleeve is sleeved on the outer peripheral surface of the oil and gas pipeline;

[0013] A loose flange is fastened to the outer peripheral surface of the polypropylene sleeve;

[0014] Concrete is cast in situ around the polypropylene sleeve, the loose flange and the oil and gas pipeline to form a concrete pier, so that the polypropylene sleeve, the loose flange and the oil and gas pipeline are wrapped and fixed in the concrete pier.

[0015] The polypropylene sleeve comprises a semi-cylindrical shell made of two polypropylene sheets, the two polypropylene sheets cover the outer surface of the oil and gas pipeline, the two polypropylene sheets are butt-joined to form a hollow cylindrical structure, and the contact surface of the polypropylene sleeve and the oil and gas pipeline fits tightly.

[0016] The loose flange is a plate type loose flange made of carbon structural steel.

[0017] The pressure rating of the loose flange is the same as the design pressure of the oil and gas pipeline.

[0018] Two reinforcing rings matching the loose flange are also mounted on the polypropylene sleeve. The loose flange is clamped between the two reinforcing rings, and the reinforcing rings are tightly against the loose flange.

[0019] The present invention also provides a design and manufacturing method for an insulated fixed thrust pipe pier for an oil and gas pipeline, which is applicable to an insulated fixed thrust pipe pier for an oil and gas pipeline. The design and manufacturing method comprises:

[0020] Take a polypropylene sleeve and cover it on the oil and gas pipeline;

[0021] Install the loose flange on the polypropylene sleeve and fasten it with matching bolts, nuts and washers;

[0022] The oil and gas pipelines equipped with polypropylene sleeves and loose flanges are fixed in the concrete pier through on-site casting.

[0023] Before all steps begin, select a loose flange with epoxy resin coated on the outer surface, and the pressure rating of the loose flange is the same as the design pressure of the oil and gas pipeline.

[0024] The number of loose flanges is single flange or double flange, as follows:

[0025] Obtain thrust from oil and gas pipelines;

[0026] When the thrust of the oil and gas pipeline is less than or equal to the design specification thrust of the fixed pier with the same pipe diameter, a single flange is used;

[0027] When the thrust of the oil and gas pipeline is greater than the design specification thrust of the fixed pier with the same pipe diameter, double flanges are used.

[0028] Double flange refers to two loose flanges mounted on a polypropylene sleeve, and the two loose flanges are fastened by stud bolts.

[0029] The present invention also provides an application of an insulated fixed thrust pipe pier for oil and gas pipelines, which is suitable for oil and gas pipelines, and the oil and gas pipelines are metal pipelines or non-metal pipelines.

[0030] The beneficial effects of the present invention are as follows:

[0031] (1) The insulated fixed thrust pipe pier for oil and gas pipelines provided by the present invention protects the outer surface of the oil and gas pipeline by means of a polypropylene sleeve which is sleeved on the oil and gas pipeline, and the polypropylene sleeve has excellent insulation properties.

[0032] (2) The insulated fixed thrust pier for oil and gas pipelines provided by the present invention has a loose flange mounted on a polypropylene sleeve, and the loose flange replaces the conventional reinforcing sleeve, fixed thrust baffle, and reinforcing rib plate. The polypropylene sleeve and the loose flange are both finished products, eliminating the cumbersome steps of cutting, processing, rust removal, welding, non-destructive testing, etc. of metal prefabricated parts in the prefabrication plant or construction site, thereby shortening the construction period and reducing the incidence of unqualified prefabricated parts.

[0033] In order to make the above contents of the present invention more clearly understood, preferred embodiments are given below and described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural diagram of the existing fixed pier.

[0035] Figure 2 It is a structural schematic diagram of an insulated fixed thrust pipe pier (single flange) for oil and gas pipelines.

[0036] Figure 3 It is a structural schematic diagram of an insulated fixed thrust pipe pier (double flange) for oil and gas pipelines.

[0037] Description of reference numerals:

[0038] 10. Polypropylene sleeve; 20. Loose flange; 30. Concrete pier; 40. Oil and gas pipeline; 50. Reinforcement ring. DETAILED DESCRIPTION

[0039] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0040] It should be noted that, in the present invention, the top, bottom, left and right in the figure are regarded as the top, bottom, left and right of the insulating fixed thrust pipe pier of the oil and gas pipeline described in this specification.

[0041] The exemplary embodiments of the present invention are now described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0042] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0043] This embodiment involves an insulated fixed thrust pipe pier for oil and gas pipelines. Figure 2 It includes a polypropylene sleeve 10, a loose flange 20, and a concrete pier 30.

[0044] The oil and gas pipeline insulation fixed thrust pipe pier also includes:

[0045] A polypropylene sleeve 10 is sleeved on the outer peripheral surface of the oil and gas pipeline 40;

[0046] The loose flange 20 is fastened to the outer peripheral surface of the polypropylene sleeve 10;

[0047] Concrete is cast in situ around the polypropylene sleeve 10 , the loose flange 20 and the oil and gas pipeline 40 to form a concrete pier 30 , so that the polypropylene sleeve 10 , the loose flange 20 and the oil and gas pipeline 40 are wrapped and fixed in the concrete pier 30 .

[0048] At the bends and the unearthed ends of underground pipelines, the temperature change will cause displacement due to insufficient axial friction resistance. In some cases, the pipeline or equipment may even be damaged due to excessive local displacement. In order to prevent damage, at the places where the pipeline may have excessive displacement, piers of a certain volume and weight are cast with concrete (with steel bars if necessary), and the friction between the pier and the soil and the soil pressure on the pier are used to limit the displacement of the pipeline. Therefore, the concrete pier 30 is an existing structure and will not be described in detail here.

[0049] The traditional fixed pier uses a reinforced casing to be mounted on the oil and gas pipeline 40 to protect the oil and gas pipeline 40. However, as a metal part, the reinforced casing needs to be designed and prefabricated in advance, and also requires steel pipe cutting, rust removal, welding and non-destructive testing. The construction period is long and the incidence of unqualified prefabricated parts is high.

[0050] Continue reading Figure 2 The polypropylene sleeve 10 includes a semi-cylindrical shell made of two polypropylene sheets, and the two polypropylene sheets cover the outer surface of the oil and gas pipeline 40. The two polypropylene sheets are joined together to form a hollow cylindrical structure, and the contact surface of the polypropylene sleeve 10 and the oil and gas pipeline 40 is tightly fitted.

[0051] The wall thickness of the polypropylene sleeve 10 is about 4-10mm (i.e., the installation gap between the inner diameter of the loose flange 20 and the outer diameter of the oil and gas pipeline 40). The polypropylene sleeve 10 is tightly combined with the oil and gas pipeline 40, and the side seams are firmly bonded with PP special glue. PP refers to polypropylene.

[0052] It should be noted that the loose flange 20 is a plate-type loose flange, and its material is carbon structural steel.

[0053] In specific implementation, the material of the loose flange 20 is Q235A / B forgings in carbon structural steel (GB / T 700), and the pressure level of the loose flange 20 is the same as the design pressure of the oil and gas pipeline 40. According to the pipeline stress analysis results, plate loose flanges with different pressure levels and pipe diameter specifications can be selected.

[0054] In this embodiment, the loose flange 20 replaces the conventional reinforcing sleeve, fixed thrust baffle, and reinforcing rib plate to bear and transmit thrust. Since the strength and quality of the finished loose flange standard parts are higher than those of the metal prefabricated parts, the thrust borne by the loose flange is greater than that of the fixed thrust baffle.

[0055] In addition, the loose flange 20 is different from other flanges. During construction, the polypropylene sleeve 10 and the loose flange 20 are directly put on the installation position from the pipe end of the installation pipe section without affecting the pipeline body. During construction, there is no need to cut the pipeline (some anchor pier designs require cutting the pipeline) or weld it on the pipeline.

[0056] The plate type loose flange is sleeved on the polypropylene sleeve 10, and is fastened with bolts, nuts and gaskets matching the loose flange 20, and C30 concrete of different sizes is poured on site according to the design drawings.

[0057] That is to say, in the present embodiment, the finished parts of polypropylene sleeve 10 and loose flange 20 can be directly purchased, the cutting, processing, rust removal, welding, non-destructive testing and other cumbersome steps of prefabrication plant or construction site metal prefabricated parts can be cancelled, the construction period can be shortened and the incidence rate of unqualified prefabricated parts can be reduced. And the design staff can directly select polypropylene sleeve 10, and the fixed pier universal design drawing formed by the plate type loose flange of different pressure levels and pipe diameter specifications, and the design method of the traditional metal prefabricated parts of the alternative design institute is simple and practical.

[0058] Optionally, in some embodiments, Figure 2 As shown, two reinforcing rings 50 matching the loose flange 20 are also mounted on the polypropylene sleeve 10 . The loose flange 20 is clamped between the two reinforcing rings 50 , and the reinforcing rings 50 are tightly against the loose flange 20 .

[0059] The reinforcement ring 50 is an optional part and is generally not required. It can be used as a reinforcement part of the loose flange 20 in some special stress areas.

[0060] This embodiment also provides a design and manufacturing method for an insulated fixed thrust pipe pier for an oil and gas pipeline, including:

[0061] Take the polypropylene sleeve 10 and cover the oil and gas pipeline 40;

[0062] Install the loose flange 20 on the polypropylene sleeve 10 and fasten it with matching bolts, nuts and gaskets;

[0063] The oil and gas pipeline 40 equipped with the polypropylene sleeve 10 and the loose flange 20 is fixed in the concrete pier 30 by on-site pouring.

[0064] It is worth mentioning that before all steps are started, a loose flange 20 with epoxy resin coated on the outer surface is selected, and the pressure level of the loose flange 20 is the same as the design pressure of the oil and gas pipeline 40. Since the polypropylene sleeve 10 is insulated, the loose flange 20 is also insulated because it is coated with epoxy resin, so the polypropylene sleeve 10 and the loose flange 20 mounted on the oil and gas pipeline 40 are insulated as a whole, which can fully protect the oil and gas pipeline 40.

[0065] The number of the loose flange 20 is single flange or double flange, as follows:

[0066] Obtaining the thrust of the oil and gas pipeline 40;

[0067] When the thrust of the oil and gas pipeline 40 is less than or equal to the design specification thrust of the fixed pier with the same pipe diameter, refer to Figure 2 , single flange is used; when the thrust of oil and gas pipeline 40 is greater than the design specification thrust of fixed pier with the same pipe diameter, refer to Figure 3 , using double flange.

[0068] Please continue reading Figure 3 The double flange refers to two loose flanges 20 mounted on a polypropylene sleeve 10 , the two loose flanges 20 are fastened by stud bolts, and a reinforcing ring 50 mounted on the oil and gas pipeline 40 can also be set on the front and rear end faces of each loose flange 20 .

[0069] The application of the insulated fixed thrust pipe pier for oil and gas pipelines is applicable to the oil and gas pipeline 40, which is a metal pipeline or a non-metal pipeline, and is no longer limited to being applicable to only metal pipelines.

[0070] In this embodiment, the insulation properties, high-strength mechanical properties and good wear resistance of the polypropylene sleeve 10 are used to protect the outer surface of the pipeline. For example, when the oil and gas pipeline 40 is a metal pipeline, the insulation properties of the polypropylene sleeve 10 can protect the metal pipeline; when the oil and gas pipeline 40 is a non-metallic pipeline, the high-strength mechanical properties and good wear resistance of the polypropylene sleeve 10 can protect the outer surface of the pipeline.

[0071] According to the oil and gas pipeline insulation fixed thrust pipe pier and design and manufacturing method provided in this embodiment, a new gathering and transportation pipeline is built in a certain oil field. The transportation medium is water-containing crude oil. The pipeline design length is 14.6 km, the design pressure is 4.0 MPa, the design temperature is 0-60 ° C, and the design flow rate is 1221 m 3 / d, the pipeline specification is seamless steel pipe L245N-φ140×6, the pipeline specification of the crossing section is seamless steel pipe L245N-φ140×7, the pipeline crosses Guchengchuan River along the way, and the river crosses both ends. After stress calculation, two 15t fixed piers need to be set, specifically:

[0072] 1. The design institute uses PN40, DN125 steel plate loose flange to design the general drawing of 15t fixed pier.

[0073] 2. The pipe of the fixed pier section is covered with a polypropylene sleeve 10, and the side seams are firmly bonded with PP special glue. The plate loose flange is put on the polypropylene sleeve 10, and fastened with bolts, nuts and gaskets matching the loose flange 20, and C30 concrete is poured on site according to the design drawings.

[0074] The insulated fixed thrust pipe pier for oil and gas pipelines provided in this embodiment mainly adopts polypropylene sleeves and finished products of plate-type loose flanges in steel pipe flanges (GB / T 9124) of the same grade as the pipeline design pressure to replace the design of metal prefabricated parts of the design institute, and is directly installed on the pipeline, which greatly facilitates the design and construction, unifies the design method of fixed piers, and promotes standardized design. Solve the problem of non-standard and non-uniform metal prefabricated parts; solve the cumbersome steps of designing metal prefabricated parts, cutting, processing, rust removal, welding of plates, etc.; solve the design of non-metallic pipeline fixed piers.

[0075] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. Insulated fixed thrust pipe pier for oil and gas pipelines, characterized in that: It includes: A polypropylene sleeve (10) is sleeved on the outer peripheral surface of the oil and gas pipeline (40); A loose flange (20) is fastened to the outer peripheral surface of the polypropylene sleeve (10); A concrete pier (30) is formed by pouring concrete around the polypropylene sleeve (10), the loose flange (20) and the oil and gas pipeline (40), so that the polypropylene sleeve (10), the loose flange (20) and the oil and gas pipeline (40) are wrapped and fixed in the concrete pier (30).

2. The insulating fixed thrust pipe pier for oil and gas pipelines according to claim 1 is characterized in that: The polypropylene sleeve (10) comprises a semi-cylindrical outer shell made of two pieces of polypropylene sheet materials, the two pieces of polypropylene sheet materials cover the outer surface of the oil and gas pipeline (40), the two pieces of polypropylene sheet materials are butt-jointed to form a hollow cylindrical structure, and the contact surface of the polypropylene sleeve (10) and the oil and gas pipeline (40) is tightly fitted.

3. The insulating fixed thrust pipe pier for oil and gas pipelines according to claim 1 or 2, characterized in that: The loose flange (20) is a plate-type loose flange made of carbon structural steel.

4. The insulating fixed thrust pipe pier for oil and gas pipelines according to claim 3 is characterized in that: The pressure rating of the loose flange (20) is the same as the design pressure of the oil and gas pipeline (40).

5. The insulating fixed thrust pipe pier for oil and gas pipelines according to claim 1 is characterized in that: The polypropylene sleeve (10) is also provided with two reinforcing rings (50) matching the loose flange (20). The loose flange (20) is clamped between the two reinforcing rings (50), and the reinforcing rings (50) are in close contact with the loose flange (20).

6. A design and manufacturing method for an insulated fixed thrust pipe pier for an oil and gas pipeline, applicable to the insulated fixed thrust pipe pier for an oil and gas pipeline as claimed in any one of claims 1 to 5, characterized in that: include: The polypropylene sleeve (10) is taken to cover the oil and gas pipeline (40); Install the loose flange (20) on the polypropylene sleeve (10) and fasten it with matching bolts, nuts and washers; The oil and gas pipeline (40) equipped with the polypropylene sleeve (10) and the loose flange (20) is fixed in the concrete pier (30) by on-site pouring.

7. The design and manufacturing method of the oil and gas pipeline insulation fixed thrust pipe pier according to claim 6 is characterized in that: Before all steps are started, a loose flange (20) with an outer surface coated with epoxy resin is selected, and the pressure level of the loose flange (20) is the same as the design pressure of the oil and gas pipeline (40).

8. The design and manufacturing method of the insulated fixed thrust pipe pier for oil and gas pipelines according to claim 6 is characterized in that: The number of the loose flange (20) is a single flange or a double flange, as follows: Obtaining the thrust of the oil and gas pipeline (40); When the thrust of the oil and gas pipeline (40) is less than or equal to the thrust of the design specification of the fixed pier with the same pipe diameter, a single flange is used; When the thrust of the oil and gas pipeline (40) is greater than the design specification thrust of a fixed pier with the same pipe diameter, a double flange is used.

9. The design and manufacturing method of the insulated fixed thrust pipe pier for oil and gas pipelines according to claim 8 is characterized in that: The double flange refers to two loose flanges (20) mounted on the polypropylene sleeve (10), and the two loose flanges (20) are fastened by stud bolts.

10. Application of insulating fixed thrust pipe piers for oil and gas pipelines, characterized in that: The invention is applicable to an oil and gas pipeline (40), wherein the oil and gas pipeline (40) is a metal pipeline or a non-metal pipeline.

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