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Oilfield Services

Pipeline Construction

CNPC is a world renowned multinational contractor in the survey, design, consultation, procurement, construction and management of long-distance pipelines and their auxiliaries, as well as medium-to-large storage tank works. We provide Chinese and foreign customers with engineering services for pipelines used to transport different medium such as crude oil, natural gas, refined products, LPG, coal gas, nitrogen, oxygen, water, ethylene, coal and ore slurry, engineering services for oil and gas storage, and technical services for oil and gas storage and transportation, in compliance with Chinese and international standards.

As the world leader in construction capacity and engineering technology for onshore long-distance oil and gas pipelines, we can build 6,700-9,700 kilometers of pipeline with a diameter larger than 711mm every year. In addition, we have the technological capacity to design and build 150kcm crude tanks and 10kcm spherical tanks. We are capable of building 26 million cubic meters of crude tanks and 16 million cubic meters of refined product tanks annually.

We have constructed the West-East Gas Pipelines, Shaan-Jing Gas Pipelines, and Western Crude Pipeline in China;the cross-border Central Asia-China Gas Pipeline, Russia-China Crude and Gas Pipelines andMyanmar-China Oil & Gas Pipelines, as well as the Muglad Basin-Port Sudan Pipeline in Sudan, East-West Gas Pipeline in India, and the Far-East Oil Pipeline in Russia.

We provide the following services:

Engineering survey, design, supervision and consultation

Pipeline construction

We install pipelines in different conditions such as mountains, deserts, plateau, tundra, swamps, hydrographic net, and collapsible loess. We are experienced in advanced technologies including semi-automatic pipeline welding, all-position automatic welding, and all-position internal welding. We have a sophisticated quality management system, HSE system, OSH (Occupational Safety and Health) system, and operational specifications.

Pipeline anti-corrosion work

CNPC has multiple world-leading operation lines, which can build a composite tri-layer anti-corrosion structure externally on steel pipes, or externally apply coal-tar enamel for anti-corrosion purposes, or internally apply coatings on steel pipes. Therefore, we can undertake tri-layer PP or PE anti-corrosion work, FBE (Fusion Bonded Epoxy) coating, and application of coal-tar enamel for anti-corrosion purposes. In addition, we can carry out anti-corrosion and heat-preservation work on other containers such as metallic storage and transportation containers and metallic gas tanks, as well as metallic anti-corrosion structures. Every day, we can accomplish 12 km of PE anti-corrosion work, 12 km of FBE anti-corrosion work, and 10 km of inner coating.

06e6807b9eae4b09b0d7748b65149d1d Inner coating of pipelines: Depending on the transported medium, the inner coating of pipelines may be divided into two types-drag-reduction and anti-corrosion. Anti-corrosion inner coating is mainly used to extend the service life of pipelines, and it requires field coating for welded joints; drag-reduction inner coating is mainly used to improve the transportation efficiency of the transported medium, thereby reducing the investment and operational costs, and it does not need field coating for welded joints.

06e6807b9eae4b09b0d7748b65149d1d CW Series of Acid Pickling and Acidizing Corrosion Inhibitors: In industrial production, corrosion inhibitors are widely used as protective additives to avoid corrosion on metallic materials which are pickled to remove their metallic oxidant and deposit layers. Acid pickling is a process in which corrosion outcomes and deposit layers are chemically dissolved and converted into soluble substances by an acid liquid. Then these substances detach from the equipment surface and flow away in the waste liquid. The CW Series contains compounds of organic amine. As they inhibit both the anode and cathode processes on the metallic surface, they are hybrid inhibitors.

Crossing works

CNPC has completed crossing works under or over medium-to-large rivers at home and abroad. These rivers include the Nile, Yellow River, Liaohe River, Songhua River, Huangpu River and Qiantang River. With a length of 2,308 meters, the crossing under the Qiantang River is the longest HDD (Horizontal Directional Drilling) crossing in the world, with the φ 273 mm steel pipeline buried at a depth of 19 m, and pulled back in a single pass.

During the crossing of Heilongjiang River on the Russia-China border when paving the Russia-China Crude Pipeline, opposite-direction drilling was adopted simultaneously on both banks to minimize the environmental impact. The crossing engineering, with a span of 1,150 meters, formally started on September 1, 2009 and planned to be completed before June 2010.

We also efficiently and safely completed the Jiujiang tunnel shielding project across the Yangtze River with a horizontal length of 2,590m during the construction of the eastern section of the Second West-East Gas Pipeline.

Installation of storage tanks

We install oil storage consisting of floating-roof tanks, underground storage, LPG storage tanks, condensate storage tanks, and Class Ⅰ, Ⅱ, and Ⅲ pressure vessels. We are capable of designing and building 26 million cubic meters of crude tanks and 16 million cubic meters of refined products tanks per year.

We also have special equipment to process panels used in the installation of storage tanks and pressure vessels. We can now weld storage tanks in a fully automatic manner.

In 2009, we erected 18.20 million cubic meters of crude tanks and 2.30 million cubic meters of refined products tanks. The LNG projects in Jiangsu Province, Dalian City, and Tangshan City saw smooth progress. As an EPC contractor, we completed 82.3% of the Zhuhai Refined Products Storage by the end of 2009, and, on December 25, 2009, delivered the 765,000 cubic meters Nansha refined products storage in Guangzhou City. The Daxiedao Tank was completed and made operational.

In 2010, we erected 3.2 million cubic meters of crude tanks and 520,000 cubic meters of refined products tanks.

In 2011, Phase-I parts of both Jiangsu and Dalian LNG projects were completed and put into operation. CNPC made its presence in the Oceania engineering and construction market for the first time by concluding a memorandum regarding Gladstone Fisherman’s Landing LNG in Australia.

Technical services related to pipelines

06e6807b9eae4b09b0d7748b65149d1d Inspection of pipeline corrosion and deformation

06e6807b9eae4b09b0d7748b65149d1d Drilling, clogging, and rerouting under pressure without stopping transportation

06e6807b9eae4b09b0d7748b65149d1d Pigging of pipelines and cleaning of oil storage tanks

No-Coating-Damage Pipe Pig: This pig was specially designed for initial pigging, prepare-for-production purging, and ongoing pigging of the internally-coated φ1016 mm pipes along the West-East Gas Pipeline.

It combines the advantages of conventional straight-plate pigs and disk pigs, and has a considerably improved skeleton. Jet holes are available and a tracing and positioning device may be carried. This product delivers enhanced passability and excellent cleaning capacity.

Technical Specifications:
Min. curvature radius of passable elbows: R=3D
Operating temperature: -20℃ - +80℃
Operating pressure: ≤10MPa
Max. deformation of passable straight pipes: 15%
Max. deformation of passable elbows: 10%.

Long-distance In-line Plugging for Pipeline Relocation

Hot-tapping and line plugging is an emergency repairing and maintenance method for pipelines under pressure without any interruption to the flow. It is safe, environmentally friendly, economic and efficient, applicable for routine maintenance and reconstruction or sudden accident repairing of pipelines with non-strong corrosive media such as oil, natural gas, water, ethylene, coal gas, medium oil and aviation oil.

1. Operation condition for Pipeline tapping:
Pipe diameter: DN50-DN1500mm steel pipe
Hole diameter: DN30-DN1500mm
Medium temperature: -30℃-+300℃
Pipeline pressure: 0-15MPa.

2. Operation condition for pipeline plugging:
Pipe diameter: DN50-DN1500mm steel pipe
Medium temperature: -30℃-+250℃
Pipeline pressure: 0-15MPa.