Observation on the development of domestic oil pip

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Observation on the development of domestic oil pipe remanufacturing industry

tubing accounts for more than 10% of the total steel used in the oil industry, and is a major consumable and cost expenditure in oil field production. Remanufacturing technology can turn waste and useless tubing into new tubing with better performance. For oilfield enterprises that scrap a large number of tubing every year, it contains considerable economic benefits

however, the tubing remanufacturing industry is still in the pilot stage in China. Few people know about remanufacturing technology, and fewer enterprises apply it

how to promote the remanufacture concept of waste oil pipes and accelerate the development of remanufacture industry? Not long ago, the Chinese Academy of Engineering held a research project meeting on the development strategy of China's oil and gas pipe remanufacture. More than 40 experts, including 5 academicians, discussed the development mode and technical means of China's oil pipe remanufacture

tubing reconstruction can be effective: one ton of remanufacture can save 50000 yuan

due to perennial corrosion and eccentric wear, the inner wall of tubing and joint threads are easy to be scrapped. Calculated by the average service life of 10 years, the amount of waste oil pipes produced in various oilfields in China is about 700000 tons, and the scrapped sucker rods are tens of millions of meters

Xu Binshi, an academician of the Chinese Academy of engineering and the initiator of China's remanufacture project, said that through the recycling and optimization of waste resources, oil pipe remanufacture can save costs for enterprises, ensure production, and reduce energy consumption and pollution

from the perspective of investment cost, the remanufacture of oil pipes can improve the corrosion resistance, wear resistance and other properties of oil pipes, prolong the service life of waste oil pipes, and reduce the consumption of new oil pipes. Taking N80 oil pipe of water injection well as an example, the reconstructed ceramic oil pipe is 89 yuan per meter, without additional anti-corrosion investment, and the investment per meter is reduced by 40 yuan. Moreover, the service life of the reconstituted oil pipe is more than 5 times that of the ordinary oil pipe, which means that one investment can save the strength, mechanical performance and product utilization performance in all directions. Compared with the old generation products, it can significantly improve the investment by 5 times. According to the price of N80 oil pipe of 0.76 million yuan/ton, recycling 1 ton of waste oil pipe can save more than 50000 yuan of oil pipe cost

Li Yiliang, deputy director of the equipment Institute of China Petroleum Exploration and Development Research Institute, pointed out that from 2013 to 2014, the consumption of tubing pipes in various oilfields of PetroChina reached 25.44 million tons, and remanufacture has good economic benefits in the application of oil pipes

in oil well production, remanufactured tubing has a greater improvement in wear resistance, wax prevention and scale prevention than ordinary tubing, which can effectively save high workover costs caused by tubing damage. Taking Changqing Oilfield as an example, the remanufactured waste oil pipes will be used in 13 oil and water wells with the most serious corrosion and scaling. Among them, the operation times of 9 oil and water wells decreased from the original 66 times to 10 times, saving 730000 yuan of operation costs, increasing the oil efficiency by 790000 yuan, and greatly reducing the corrosion and wear of oil pipes

in terms of resources and environment, waste oil pipes containing harmful substances are easy to accumulate and form solid waste. Remanufacturing technology has revitalized these waste assets. More importantly, the average life of remanufactured oil pipes is more than three times that of ordinary new oil pipes. The remanufacture of 1 ton of waste oil pipes means that 5 tons of steel can be reduced, 43 tons of standard coal can be saved, 275 tons of water can be saved, and 10 tons of carbon dioxide can be reduced

Xu Binshi believes that the remanufacture of oil pipes can not only recover the direct loss of pipes, but also a large number of indirect losses of oil fields, which is "great potential and imperative" in China

tubing reconstruction started late, and the industrial scale needs to grow.

after the development of petroleum equipment remanufacture technology in Europe, America, Japan and other places in the 1970s, it has developed on the basis of the higher manufacturing cost of prototype products, mainly based on size repair method and replacement repair method, forming a mature system in core recycling, production process, processing and manufacturing equipment and technical standards

the remanufacture of waste pipes in China began with the exploration of "waste pipe recycling technology" carried out by Jilin oil field in 2005. It has experienced the concept proposal, technology research and development and pilot promotion, and has developed for only 10 years

technically, China's oil tube remanufacturing technology started late, but it came from behind, and some technologies have made breakthroughs. The remanufactured product catalogue released by the Ministry of industry and information technology shows that there are two kinds of tubing remanufacturing technologies independently developed in China: self propagating repair technology and lined anti-corrosion and wear-resistant tubing technology. Among them, self propagating repair technology is in a leading position in China's petroleum equipment industry and even in the world

Yang Yongli, the chairman of most companies that developed this technology, told that at present, there is a bottleneck in the foreign self spreading technology, and the length of the repairable oil pipe is limited to 2 to 3 meters, while the technology independently developed in China has been able to successfully repair oil pipes more than 10 meters, and the cost per meter is 10 to 40 yuan lower than the new oil pipe

in terms of application, remanufactured tubing has been piloted in about 10 oil fields in China, and has basically achieved good results. By the end of 2014, the lined anti-corrosion oil pipes used in Shengli, Dagang, Jidong, Zhongyuan, Yanchang and other oilfields had reached more than 5 million meters, and more than 3000 wells had been treated for anti-corrosion, scale prevention and deviation prevention. Changqing, Xinjiang, Jilin and other oilfields have used self propagating repair technology to achieve the repair rate of oil field waste oil pipes of 80%. Many oilfields propose to expand the use scale of reconstituted tubing

in terms of capacity scale, the current domestic tubing remanufacturing capacity needs to be further improved. The annual scrap volume of tubing in China is about 700000 tons, and it is also increasing year by year. However, at present, the domestic oil pipe remanufacturing capacity is less than 100000 tons per year

Li Yiliang said at the meeting that although there are a large number of state-owned private repair plants engaged in tubing repair experimental instruments in domestic oilfields, which are divided into eight categories of products according to the object of action and function, most of the utilization technology is only the primary classification and processing of waste tubing, which can not reach the remanufacturing level of "old in new", and the efficiency of waste tubing recycling is limited. This fundamentally limits the capacity scale of tubing remanufacturing

tubing remanufacture needs to promote the concept of "first to rebuild"

at present, tubing remanufacture promotion is facing a rare policy opportunity. The state gives a 10% subsidy of "trade in for remanufactured products". If 500000 tons of waste oil pipes are manufactured again, the state will subsidize 5.4 billion yuan. For remanufacturing enterprises, remanufacturing 10000 tons of waste oil pipes can bring an output value of 80million yuan and considerable profits, and then take more than 200mm adhesive tape and paste it on polyester film

however, the remanufacturing project investigation team at the meeting pointed out that at present, most employees of many domestic oilfields, including material supply personnel, know little about the waste pipe recycling policy and benefits. Zhang Feng, director of the oil well pipe Research Office of Baoji steel pipe Research Institute, said that the business direction of PetroChina's oil pipe manufacturing enterprises is mainly new oil pipes, and they don't know much about waste pipe recycling technology and basically don't get involved

experts at the project meeting agreed that the current oil pipe remanufacture industry is small in scale and there are few remanufacture subjects, mainly because the concept of oil pipe remanufacture is not deeply rooted in the hearts of the people. Therefore, the most important thing is to strengthen the publicity of the tubing remanufacturing industry, and the tubing remanufacture must first have the concept of "remanufacture"

in addition to the problem of concept and understanding, remanufacturing in the oil industry also faces problems in technology, management and other aspects in the process of industrialization

Li Helin, an academician of China Petroleum Management Research Institute, said at the meeting that in terms of technology, China has made some breakthroughs in tubing remanufacture technology, but there is a long way to go in the future

on the one hand, the liquid composition in oil-water wells becomes more and more complex with the development. At the same time, the development of deep wells and high-pressure wells requires oil well pipes to have better corrosion resistance and higher strength. China's oil pipe autonomous reconstruction technology has achieved initial success in some aspects, but the scope and depth of application need to be expanded

on the other hand, the types of pipes used in oil fields in China are diverse, with different diameters, and the situation is complex. To promote remanufacturing, we need to further develop its technology and equipment according to local conditions. Qi Dongtao, director of the composite material research center of CNPC pipe Research Institute, also said that both non-metallic and composite tubing will be competitors of remanufactured tubing in the future

in terms of management, tubing remanufacture is an emerging industry, which requires relevant departments to formulate industry standards as soon as possible. Li Yiliang said that at present, it is necessary to establish systematic and perfect technical standards and quality for the remanufacturing process of oil rods and tubes as soon as possible. In addition, the remanufacturing theoretical system should be improved, the life evaluation theory of waste oil pipes and remanufactured products should be studied, and the residual life evaluation method of oil well tubing and rod should be established

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