CN215050710U - Impressed current cathodic protection system of protection is united with formula of going far away to tensioning formula - Google Patents
Impressed current cathodic protection system of protection is united with formula of going far away to tensioning formula Download PDFInfo
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- CN215050710U CN215050710U CN202121466888.XU CN202121466888U CN215050710U CN 215050710 U CN215050710 U CN 215050710U CN 202121466888 U CN202121466888 U CN 202121466888U CN 215050710 U CN215050710 U CN 215050710U
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Abstract
The utility model discloses an impressed current cathodic protection system of protection is united with far ground formula to tensioning formula, including stretch-draw platform, the jacket, compound cable, fixing device, the cable is drawn forth to the positive pole and the supplementary positive pole of far ground, stretch-draw platform is fixed in the jacket top, the bottom of jacket is fixed in on the seabed, be equipped with tensioning equipment and DC power supply on the stretch-draw platform, the one end and the tensioning equipment of compound cable are connected, the other end of compound cable passes through fixing device to be fixed in the jacket bottom, it has supplementary positive pole and reference electrode to integrate on the compound cable, DC power supply is the power supply of compound cable, the supplementary positive pole of far ground is laid on the seabed, the supplementary positive pole of far ground passes through the positive pole and draws forth the cable and be connected with compound cable. The utility model discloses compensate the limited not enough of tensioning formula impressed current cathodic protection system usage space, solved the jacket and cross the protection or owe the problem of protection, avoided the difficult, the high and big problem of operation risk of construction operation.
Description
Technical Field
The utility model belongs to the anticorrosive field of ocean engineering, concretely relates to tensioning formula and impressed current cathodic protection system of protection is united to formula far away.
Background
Offshore oil and gas development is most common with fixed platforms, which have a long service life. The oil platform can be seen as being composed of two parts, the upper part is a functional area, and the lower part is a jacket. The jacket serves as the foundation for the entire platform, and its stability and safety are critical to the platform. Since the jacket is in a severe marine environment throughout the year, the jacket structure safety is examined at the time of severe seawater corrosion, and a cathodic protection measure is usually taken to prevent corrosion damage.
The Impressed Current Cathodic Protection (ICCP) technology has the advantages of maturity, reliability, low resource consumption, economy, environmental protection and the like, and particularly, the tension type ICCP system has short installation period and low cost and is often applied to the field of corrosion protection of a jacket. However, because the structural span of the jacket is large, a good protection effect can be achieved only by arranging a plurality of sets of anode strings, and the space of the in-service platform is limited, so that the requirement of the arrangement space of the anode strings is difficult to meet. And the tensioning type ICCP system is generally arranged in the jacket along the water depth direction, the bottom structure of the single jacket is far away from the anode, and the under-protection risk is easy to occur. With the gradual trend of ocean oil and gas exploitation to deep water areas, the underwater jacket structure of the ocean oil and gas platform is more complex, the structure size is larger, the required protection area is larger, and the improvement of the protection capability of the impressed current method cathode protection system is more and more important.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the proposition of above problem, and the impressed current cathodic protection system of protection is united with the formula of studying and designing a tensioning formula, solves current impressed current cathodic protection system and is difficult to carry out comprehensive protection scheduling problem to the jacket. The utility model discloses a technical means as follows:
the utility model provides an impressed current cathodic protection system of protection is united with far ground formula to tensioning formula, includes stretch-draw platform, jacket, compound cable, fixing device, positive pole and the supplementary positive pole of far ground, stretch-draw platform is fixed in the jacket top, the bottom of jacket is fixed in on the seabed, be equipped with tensioning device and DC power supply on the stretch-draw platform, the one end of compound cable with tensioning device connects, the other end of compound cable passes through fixing device fixes the jacket bottom, it has supplementary positive pole and reference electrode to integrate on the compound cable, DC power supply does compound cable power supply, the supplementary positive pole of far ground is laid on the seabed, the supplementary positive pole of far ground pass through the positive pole draw forth the cable with compound cable is connected.
Preferably, the fixing device is a gravity base, and the composite cable is connected with the gravity base through a hoop or a lifting lug.
Preferably, the fixing device is a steel wire rope, the end part of the steel wire rope is fixed on the jacket, and the composite cable is connected with the steel wire rope.
Preferably, the composite cable further comprises a terminal, and the composite cable is connected with the anode outgoing cable through the terminal.
Preferably, the connecting terminal is a Y-shaped deconcentrator.
Preferably, a riser is arranged in the jacket, the composite cables are arranged in parallel along the riser, and the height of the bottom of the composite cables is not lower than that of the pile legs of the jacket.
Preferably, the number of the remote auxiliary anodes is four, the four remote auxiliary anodes are uniformly laid around the jacket, the number of the composite cables is two, and each composite cable is respectively connected with two remote auxiliary anodes.
Compared with the prior art, the beneficial effect of the impressed current cathodic protection system of the joint protection of a tensioning formula and far-ground formula be: the utility model discloses well adoption uses tensioning formula ICCP as leading, and the design of a plurality of small-size ground formula anodes far away for assisting compensates the limited not enough of tensioning formula usage space, also can solve the jacket and cross the protection or owe the problem of protection, plays good complementary effect, can improve the cathodic protection effect, reduces the construction operation degree of difficulty, construction cost and operation risk.
Drawings
Fig. 1 is a schematic view of the overall structure in the embodiment of the present invention.
Fig. 2 is a schematic top view of the structure of fig. 1.
Fig. 3 is a schematic front view of the structure of fig. 1.
Fig. 4 is a schematic left-side view of the structure of fig. 1.
Fig. 5 is an enlarged schematic view of a portion a of fig. 1.
In the figure, 1, a tension platform; 11. a tensioning device; 2. a jacket; 21. a riser pipe; 22. pile legs; 3. a composite cable; 31. a Y-shaped splitter; 4. a gravity base; 41. lifting lugs; 5. the anode is led out of the cable; 6. the anode is remotely assisted.
Detailed Description
As shown in fig. 1-5, an impressed current cathodic protection system for combined protection of a tensioning type and a remote type comprises a tensioning platform 1, a jacket 2, a composite cable 3, a fixing device, an anode leading-out cable 5 and a remote auxiliary anode 6. The tension platform 1 is fixed on the top of the jacket 2, and the bottom of the jacket 2 is fixed on the seabed through the pile legs 22. The tensioning platform 1 is provided with a tensioning device 11, a direct-current power supply, a junction box and the like, one end of the composite cable 3 is connected with the tensioning device 11, and the other end of the composite cable 3 is fixed at the bottom of the jacket 2 through a fixing device. The tensioning device 11 may be a portal type, or may be in other forms such as a round pile type, and is used to apply pretension to the composite cable 3 to form a tensioning type ICCP system. A plurality of auxiliary anodes and reference electrodes are integrated on the composite cable 3, and both the auxiliary anodes and the reference electrodes have high water tightness and can meet the working conditions of deep water sea areas. The remote auxiliary anode 6 is laid on the seabed, and the remote auxiliary anode 6 is connected with the composite cable 3 through the anode leading-out cable 5 to form a remote ICCP system. Wherein, the direct current power supply outputs protection current, and the protection current flows through the tension type composite cable 3, the anode leading-out cable 5, the remote auxiliary anode 6 and the seawater loop and returns to the protection steel structure.
The fixing device is a gravity base 4, the composite cable 3 is connected with the gravity base 4 through structures such as a hoop or a lifting lug 41, one end of the composite cable 3 is sunk into the seabed through the gravity base 4, the other end of the composite cable 3 is tensioned through the tensioning device, and the composite cable 3 is guaranteed to be in a tensioning state.
In another embodiment, the fixing device is a steel wire rope, both ends of the steel wire rope are fixed on the jacket 2, and the composite cable 3 is connected with the steel wire rope. When the jacket 2 is located in shallow sea, the disturbance of sea waves is small, the composite cable 3 is fixed through the steel wire rope, and construction cost and period are saved.
The underwater tail end of the composite cable 3 is provided with a cable butt joint end, namely a wiring terminal, which is used for butt joint with the anode leading-out cable 5. Specifically, the wiring terminal can be a Y-shaped distributor 31, and the composite cable 3 is connected with the anode outgoing cable 5 through the Y-shaped distributor 31, so that underwater installation is facilitated.
A riser 21 is arranged in the jacket 2, and the riser 21 has the main function of isolating seawater to form a drilling fluid circulation channel and is used as a holding structure of an offshore wellhead. The composite cable 3 is arranged in parallel along the riser 21, the bottom height of the composite cable 3 is not lower than the height of the pile leg 22 of the jacket 2, and the composite cable 3 is matched with the remote auxiliary anode 6 to arrange and protect key components such as the riser 21 and the pile leg of the complex platform.
Each composite cable 3 can be butted with a plurality of groups of remote auxiliary anodes 6, and the remote auxiliary anodes can be arranged in a multi-point and multi-place mode. In this embodiment, the number of the remote auxiliary anodes 6 is four, the four remote auxiliary anodes 6 are uniformly laid around the jacket 2, the number of the composite cables 3 is two, and each composite cable 3 is connected to two remote auxiliary anodes 6 respectively, so that the bottom of the jacket 2 can be protected comprehensively.
The utility model discloses an impressed current cathodic protection system installation method is also comparatively nimble, and following two kinds of methods all can be selected according to the field operation condition:
firstly, installing a tensioning ICCP system, and then installing a remote ICCP system, wherein the steps are as follows:
1) hoisting and lowering the gravity foundation 4 to be in place to a specified mud surface position on the seabed;
2) lowering the composite cable 3, and connecting a cable joint at the lower end of the composite cable 3 with the gravity foundation 4 through an underwater ROV;
3) the cable joint at the upper end of the composite cable 3 is connected with the tensioning device 11, and the tensioning device 11 applies tensioning force to the composite cable 3 to achieve the designed pretension force, so that a tensioning type ICCP system is formed;
4) arranging the remote auxiliary anode 6 at a preset position far away from the seabed of the protected structure by an engineering ship;
5) drawing an anode leading-out cable 5 of a remote auxiliary anode 6 to a cable butt joint end at the lower end of the composite cable 3 in place through an underwater ROV;
6) and carrying out cable butt joint to complete underwater electrical connection between the anode leading-out cable 5 and the composite cable 3, so as to form combined protection of the remote ICCP system and the tensioning ICCP system.
Secondly, installing a remote ICCP system and then installing a tensioning ICCP system, wherein the steps are as follows:
1) arranging the remote auxiliary anode 6 at a preset position far away from the seabed of the protected structure by an engineering ship;
2) hoisting and lowering a gravity foundation 4 in the tension type ICCP system to be in place to a specified mud surface position;
3) lowering the composite cable 3 in the tension type ICCP system, and connecting a cable joint at the lower end of the composite cable 3 with a gravity foundation 4 through an underwater ROV;
4) the cable joint at the upper end of the composite cable 3 is connected with a tensioning device 11, and a tensioning force is applied to the tensioning type ICCP system through the tensioning device 11 to achieve a designed pretension force;
5) drawing an anode leading-out cable 5 of a remote auxiliary anode 6 to a cable butt joint end at the lower end of the composite cable 3 in place through an underwater ROV;
6) and carrying out cable butt joint to complete underwater electrical connection between the anode leading-out cable 5 and the composite cable 3, so as to form combined protection of the remote ICCP system and the tensioning ICCP system.
The combined protection of the tension type ICCP system and the remote ICCP system is realized through the mode, the direct-current power supply not only supplies power for the auxiliary anode on the composite cable 3, but also supplies power for the remote auxiliary anode 6 through the anode leading-out cable 5 arranged on the seabed.
The tensioning ICCP system does not need a large amount of underwater installation operation, and has the advantages of short installation period, low cost and better protection effect. When a traditional underwater protection mode adopts a tension type ICCP system, due to the fact that the structural span of a jacket is large, a good protection effect can be achieved only by arranging a plurality of sets of composite cables with anode strings at different positions, the composite cables are required to be free of interference with the existing structure of the jacket, and the whole device needs to have enough installation space and reserve safe intervals; due to the limited space of the in-service platform, the requirement of the arrangement space of the multi-composite cable is difficult to meet. In addition, the tensioning type ICCP system is generally arranged inside the jacket along the water depth direction, the top of the jacket is close to the anode, effective protection can be achieved, the bottom structure of the single jacket is far away from the anode, and due to the shielding of the waterproof casing, underprotection risks are prone to occurring.
Remote ICCP systems take up very little space inside and therefore have little to no jacket internal space requirements. The remote auxiliary anode is required to be arranged at the mud surface of a plurality of positions of the seabed at the periphery of the outer part of the jacket and keeps a certain distance and angle with the jacket. Because the jacket structure is higher, the upper structure of the jacket is far away from the anode far away from the ground, the bottom span of the jacket is large, so that the distance difference between the structure and the auxiliary anode is large, the distribution of protection potential is uneven, the situation that the bottom is partially negative and the upper part is partially positive, the situation that the bottom is close to the anode structure and the position far away from the anode is partially positive is easily presented, and the problems of under-protection and over-protection of different positions of the jacket are easily caused. And the cathode protection effect of the large jacket platform can be basically ensured only by arranging a plurality of strings of remote-ground-type systems, and the installation of the plurality of strings of remote-ground anodes involves a large amount of underwater operation and engineering ship assistance (underwater cable routing cleaning, cable laying, equipment installation and the like), so that the construction cost, difficulty and risk are high.
The utility model provides a pair of impressed current cathodic protection system of protection is united with formula far away to tensioning formula ICCP is given first place to, and a plurality of small-size formula anodes far away are for assisting. Because the remote ICCP system is arranged, the tension ICCP system can be arranged more simply, the number of the auxiliary anodes on the composite cable 3 can be relatively less, and the protection potential of the whole jacket 2 can be ensured to be uniform, so that the requirement of the installation space inside the jacket 2 is greatly reduced. And meanwhile, the operation process that when the remote auxiliary anode 6 is directly installed in the past, a cable protective pipe must be laid along the main leg of the jacket 2 to the mud surface position and welded underwater, the cable protective pipe is complicated in underwater threading, difficult, long in period and high in risk is eliminated. The utility model discloses can carry out arranging of multiple spot, many places to the supplementary positive pole of far-ground formula, especially can need the position that the key protects to the platform like water-proof casing pipe 21, key parts such as complicated platform spud leg 22 arrange the protection, reduce tensioning formula ICCP's the design degree of difficulty, arrange the degree of difficulty, make the whole 2 whole electric potentials of jacket tend to unanimity, protect more evenly, improve power efficiency, reduce cost and consumption.
In conclusion, in the face of the complex structure of the large jacket, the combined application of the design with the tension type ICCP as the main part and the remote type ICCP as the auxiliary part can play a good complementary role in corrosion protection, so that the protection effect is more uniform, the over-protection risk and the under-protection risk are reduced, the space requirement and the construction difficulty are reduced, the construction cost is saved, and the protection effect and the reliability of the corrosion protection are improved.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (7)
1. An impressed current cathodic protection system of joint protection of tensioning formula and far-ground formula which characterized in that: comprises a tension platform (1), a jacket (2), a composite cable (3), a fixing device, an anode leading-out cable (5) and a remote auxiliary anode (6), the tensioning platform (1) is fixed on the top of the jacket (2), the bottom of the jacket (2) is fixed on the seabed, a tensioning device (11) and a direct current power supply are arranged on the tensioning platform (1), one end of the composite cable (3) is connected with the tensioning device (11), the other end of the composite cable (3) is fixed at the bottom of the jacket (2) through the fixing device, an auxiliary anode and a reference electrode are integrated on the composite cable (3), the direct current power supply supplies power to the composite cable (3), the remote auxiliary anode (6) is laid on the seabed, and the remote auxiliary anode (6) is connected with the composite cable (3) through an anode leading-out cable (5).
2. The impressed current cathodic protection system of claim 1, wherein: the fixing device is a gravity base (4), and the composite cable (3) is connected with the gravity base (4) through a hoop or a lifting lug (41).
3. The impressed current cathodic protection system of claim 1, wherein: the fixing device is a steel wire rope, the end part of the steel wire rope is fixed on the jacket (2), and the composite cable (3) is connected with the steel wire rope.
4. The impressed current cathodic protection system of claim 1, wherein: the composite cable (3) is connected with the anode leading-out cable (5) through the wiring terminal.
5. The impressed current cathodic protection system of claim 4, wherein said impressed current cathodic protection system comprises: the wiring terminal is a Y-shaped deconcentrator (31).
6. The impressed current cathodic protection system of claim 1, wherein: a riser (21) is arranged in the jacket (2), the composite cables (3) are arranged in parallel along the riser (21), and the height of the bottom of each composite cable (3) is not lower than that of a pile leg (22) of the jacket (2).
7. The impressed current cathodic protection system of claim 1, wherein: the number of the remote auxiliary anodes (6) is four, the four remote auxiliary anodes (6) are uniformly laid around the jacket (2), the number of the composite cables (3) is two, and each composite cable (3) is respectively connected with two remote auxiliary anodes (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121466888.XU CN215050710U (en) | 2021-06-29 | 2021-06-29 | Impressed current cathodic protection system of protection is united with formula of going far away to tensioning formula |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121466888.XU CN215050710U (en) | 2021-06-29 | 2021-06-29 | Impressed current cathodic protection system of protection is united with formula of going far away to tensioning formula |
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| CN202121466888.XU Active CN215050710U (en) | 2021-06-29 | 2021-06-29 | Impressed current cathodic protection system of protection is united with formula of going far away to tensioning formula |
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| CP03 | Change of name, title or address |
Address after: 116000 Miao Ling Village, Lingshui Town, Ganjingzi District, Dalian City, Liaoning Province Patentee after: Dalian Komeier Marine Technology Co.,Ltd. Address before: 116000 room 1008, TAD building, 537 Huangpu Road, hi tech park, Dalian, Liaoning Patentee before: DALIAN KINGMILE ANTICORROSION TECHNOLOGY Co.,Ltd. |
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