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Impressed current cathodic protection for offshore oil platforms

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Offshore oil platform tensioned anode impressed current cathodic protection system

System introduction

Tensioned anode impressed current cathodic protection system.It is a new impressed current cathodic protection system applicable to the foundation of new and existing jacket platforms. The auxiliary anode and reference electrode in the cathodic protection system are integrated on the composite cable with load-bearing steel wire rope, and the integrated installation of the composite cable-electrode system on the jacket foundation is realized through the tensioning device. The structure is safe and reliable, and can withstand the impact of 100-year storm surge; The power supply equipment is designed with a multi-channel cathodic protection power controller. Each group of power modules and auxiliary anodes correspond to each other to realize distributed independent control, and realize the fine adjustment of the output current of auxiliary anodes. It is especially suitable for jacket platforms with complex structural forms, and is the only solution to prolong the service life of the deep-water jacket cathodic protection system.

▎Cathodic protection and monitoring technology and equipment for offshore structures

▎System constitute of tensioned anode impressed current cathodic protection

Distributed intelligent power system

Composite cable-electrode system

Intelligent remote measurement and control system

Composite cable tensioning system

Cathodic protection numerical simulation and evaluation system

Basic principle

◆ Cathodic protection technology is a kind of electrochemical protection technology. Its principle is to apply an applied current to the surface of the corroded metal structure, and the protected structure becomes a cathode, so that the electronic migration of metal corrosion can be inhibited, and the occurrence of corrosion can be avoided or weakened.

◆ Cathodic protection is divided into impressed current cathodic protection and sacrificial anode cathodic protection.

Product parameters

▎Composite cable parameters

▎Composite cable parameters

Product characteristics

▎The tensioned ICCP system has the following significant technical advantages

◆ Reasonable layout: the composite cable (i.e. anode string) is arranged inside the jacket structure, and the auxiliary anodes are arranged at each water depth of the jacket along the water depth direction. The position and quantity of the auxiliary anodes on the composite cable are determined through the cathodic protection numerical simulation software, so that the jacket surface protection effect is uniform, and there will be no over-protection and under-protection; It is laid inside the jacket without risk of chafing by fishing nets;

◆ Fine control: according to the numerical simulation, each anode is relatively evenly distributed inside the jacket, and each anode is equipped with an independent power supply module to independently adjust the protection current of each anode to achieve the fine control of cathodic protection in each area of the jacket, and each anode current can be adjusted in coordination with each other to achieve overall and unified control, to ensure the uniformity of potential and the maximization of cathodic protection current utilization.

◆ Tension-type integrated installation of composite cable-electrode system: multiple sets of auxiliary anodes are integrated on the composite cable, and the composite cable has high-strength steel wire rope and multi-layer water-blocking structure design inside, which can realize integrated distributed installation, simple, economical, and short installation cycle, greatly reducing the demand for underwater work; At the same time, through the motion response and force simulation calculation of the composite cable under the 100-year return period sea condition, a reasonable tension force is applied to the composite cable to suppress the lateral swing of the composite cable, thus greatly improving the reliability and durability of the composite cable.

◆ Long-effect pressure-resistant packaging process: underwater core components such as composite cable, auxiliary anode and reference electrode are prepared by long-effect waterproof and pressure-resistant process, which can meet the long-term service under 5MPa water pressure environment;

◆ Replaceable: all installation can be completed at the onshore construction stage of the jacket, and the jacket can be placed at sea; Due to the tensioning arrangement of composite cable, it can be recycled and replaced once damaged.

Numerical simulation optimization design and verification

Composite tension installation structure, easy to install

Cathodic protection data management platform realizes monitoring and prediction

Distributed multi-channel control power supply device

It can be disassembled and replaced in the later stage, with less underwater operation

Full-life operation and maintenance management and technical support

Application performance

Kingmile is the only manufacturer in China that can provide tensioned ICCP solutions and complete sets of products for offshore oil jacket platforms, and also the only manufacturer in China that has successful application cases of tensioned ICCP for jacket in service. Its first set of tensioned ICCP system has been successfully applied to Lufeng 13-2WHP platform. Since it was put into operation in May 2017, after several super typhoons, the system has operated stably and the jacket protection effect is good.

At present, it has been applied to Lufeng 13-2WHP platform (132m water depth), Wenchang 13-1WHPA and Wenchang 13-2WHPA (117m water depth), and Panyu 30-1DPP platform (200m water depth).

▎Lufeng 13-2WHP platform

▎Wenchang 13-1, 13-2 WHPA platform

▎Panyu 30-1DPP platform

▎Kenli 6-1 WHPI/WHPH platform

▎Bozhong Kenli shore power platform

▎Kenli 6-1WHPF platform

Application performance

Type	Project	Number of platforms	Water depth	Platform name	State
New Platform	Lingshui 25-1	1	88.3m	YC13-1 PAP	Design
New Platform	Bozhong 19-6 Phase I	4	20~30m	BZ19-6 CEPA/WHPB/WHPC/WHPM	build
New Platform	Bozhong 29-6	2	20~30m	BZ29-6 WHPA/WHPB	build
New Platform	Kenli 6-1	3	20~30m	KL6-1 WHPH/WHPI/PAP	Stable operation and good protection
New Platform	Kenli 6-1	7	20~30m	KL6-1 CEP/WHPB/C/D/E/F/G	build
New Platform	Bozhong-Kenli shore power	4	20~30m	BZ34-1 EPP, BZ19-6 EPP, BZ35-2 EPP, KL10-1 EPP	build
New Platform	Liuhua 11-1	1	20~30m	LH11-1 DPP	Design
New Platform	Jinzhou 23-2	2	20~30m	JZ23-2 CEPA/CEPB	Design
New Platform	Bozhong 34-9	1	20~30m	BZ34-9 WHPC	Design
New Platform	Chengbei CEPC	1	20~30m	埕北 CEPC	Design
New Platform	Lvda 5-2 North Oil Field Phase II Development	2	20~30m	LD5-2N WHPB/PAP	Design
New Platform	Bozhong 28-2S	1	20~30m	BZ 28-2S-CEPC	build
New Platform	Lvda Suizhong Project	4	20~30m	LD5-2 CEPC、SZ36-1 CEPQ、SZ36-1 WHPR、SZ36-1 WHPS	Design
New Platform	Bozhong 19-6	1	20~30m	BZ19-6 WHPD	Design
Life extension of in-service platform	Zone 5 and 10 of Penglai 19-3 Oilfield	2	20~30m	PL19-3 WHPH/WHPN	build
Life extension of in-service platform	Lufeng 13-2	1	132m	LF13-2 WHP	Stable operation since June 2017
Life extension of in-service platform	Wenchang 13-1	1	117m	WC13-1 WHPA	Stable operation since May 2021
Life extension of in-service platform	Wenchang 13-2	1	117m	WC13-2 WHPA	Stable operation since May 2021
Life extension of in-service platform	Panyu 30-1	1	200m	PY30-1 DPP	Put into operation in August 2022
Total		40

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Email：wangmei@kingmile.com