On January 3, as a major subdivision of new energy vehicles, pure electric passenger vehicles have been on the topic for a long time. The industry has begun to focus on the development of low-speed electric vehicle market, and hopes to have more intelligent development ideas in the field of regulations and low-speed electric vehicles. Low-speed electric vehicles are one of the important strategies for urban travel Returning to the background of China's economic development, Ren Zeping, chief economist of Founder Securities, said: "With the impact of China's economic regulation and control policies, and the upgrading of future industries to high-end manufacturing and modern service industries, China's population mobility will continue from rural to urban areas. And the migration of third- and fourth-tier cities to the metropolitan area.†The data shows that 3.5 billion people in the world live in high-density urban areas and will exceed 5 billion by 2030. Most of the follow-up new high-density urban areas are in developing countries. For example, in China, it is estimated that 300 million rural people will flood into cities by 2030. At that time, urban travel will be the main factor affecting efficiency. At present, relevant countermeasures must be prepared. From the pure electric passenger car in the new energy vehicle, it has many advantages such as high work efficiency, low noise, stable driving and no dependence on oil. It is suitable for China's national conditions and is strongly supported by national policies. With the closing of the auto market in 2016, the production and sales of the Chinese auto market have generally increased steadily. It is estimated that the total annual sales volume of automobiles will exceed 27 million units. From the sales volume of domestic new energy vehicle companies in 2016, it is expected that the overall sales growth of new energy passenger vehicles will reach more than 100%. However, the new energy vehicle development mainly depends on the rapid development of pure electric vehicle market, and pure electric vehicle battery technology and market infrastructure is facing difficulties, but also with considerable production gasoline car inspection standards. Undoubtedly, the lag of such policies and regulations has formed a large gap with the market status, and has become the focus of continuous discussion in the industry. The data shows that China's low-speed electric vehicles have maintained rapid growth for four consecutive years from 2012 to 2015, with a year-on-year increase of 196.4% in 2012. Since then, the average annual growth rate of low-speed electric vehicles has approached 50%, and sales in 2015 have exceeded 600,000. In 2016, the expected sales volume will exceed one million units. The low-speed electric vehicle utilizes the current battery technology and the basic advantages of electric vehicle charging, which undoubtedly meets the needs of users and gains greater market growth, and has become one of the important strategies for current urban travel. Low-speed electric vehicle policy and market who is on the road In October 2016, the website of the Ministry of Industry and Information Technology previously announced the work of “upgrading a batch, standardizing a batch, and eliminating a batch†of low-speed electric vehicle development. The leaders of the State Council have already approved the agreement. On December 27th, the National Standards Committee organized the second meeting of the four-wheeled low-speed electric vehicle standard working group. Chen Quanshi, director of the China Automotive Engineering Society and deputy director of the National Automobile Standardization Electric Vehicle Professional Committee, revealed that the management of the new national standard for low-speed electric vehicles Before the contrast, the five requirements for qualifications, standards, licenses, driver's licenses and insurance will be added. The safety management will be the same as the “ordinary passenger carsâ€. The new national standard policy has undoubtedly become a one-size-fits-all approach, shutting out more than 90% of low-speed electric vehicles. For low-speed electric vehicles, industry professionals hold different views: Wang Binggang, a special expert on major technologies for electric vehicles in the 863 Program of the Ministry of Science and Technology, once said that the problems currently encountered in the low-speed electric vehicle industry are concentrated in product access and market management. "In terms of market management, the state should adopt a classified management approach for low-speed electric vehicles. In terms of road rights, can low-speed vehicles be allowed to drive on certain speed-limited roads? If the policy is right, it may form a million-level or even Ten thousand class market." Chen Qingtai, chairman of the China Electric Vehicle Hundred People's Association, said: "I advocate an open support for it because low-speed electric vehicles have realistic needs in third- and fourth-tier cities, and the performance of such vehicles can satisfy the travel of local residents. Need, no special infrastructure, matching the local economic level, is a completely market-oriented product." The president of Netcom, Xinhua News Agency’s former editorial board member Li Anding has said bluntly: “For me, before the battery technology has experienced a qualitative leap, I would rather have a small electric vehicle with a battery life of less than 50 kilometers. For short trips, both economical and charging are easy." Xinhua News Agency reporter Zhang Yi wrote the opposite view that the low-speed electric vehicles first had chaos. To solve the problem, we must first break the local protection. Secondly, we must strictly control production and sales. Enterprises must strive to obtain production qualifications according to regulations. Qualified car companies cooperate to legally produce and legally sell. Third, the traffic control department must take up its responsibilities and resolutely ban low-speed electric vehicles that are not licensed or illegally on the road. For the development of pure electric vehicles, the core is still battery technology issues. Sina Auto previously interviewed Wei Yincang, chairman of the car battery company Yinlong Group. He believes that the new energy vehicle industry has been biased. China’s subsidy policy makes the industry irrational and investment is not Rationality, irrational consumption, and irrational R&D. With the banner of new energy, the company pursues a single large mileage and high speed, which leads everyone to produce batteries with short life, danger and consume a lot of energy resources. Ignore the demand for short-distance low-speed passenger cars that people use to commute to work in 90% of the city. They must ignore safety and disregard the total consumption of energy, regardless of China's national conditions. New forces in building cars are involved in low-speed electric vehicles or have new ideas Despite the doubts about the regulations of low-speed pure electric vehicles, when more and more new companies are emerging, some of these companies have already positioned their market targets in this field. Sina Auto continued in September-November 2016. The organization's "New Car Power Investigation" activity found that such plans as micro-electric vehicles related to cars and homes, Kaiyun vehicles, and Yundu New Energy are the low-speed electric vehicles market. Shen Yanan, president of the car and home, bluntly said: As a new car company, we do not lose money to buy and sell. To this end, we can find the demand to achieve commercial value. The car and home are positioned as providers of future urban smart travel services. For the consumer, there is no such thing as a circumstance, that is, from the so-called point A to point B, the most convenient, most economical, and most worry-free, this is the plan for consumers to see travel. Based on demand, future cars and homes can provide the corresponding models and services. The focus of other new car-building forces is also based on travel demand, designing the corresponding models, however, the various operating ideas are different, and further attention is needed. Conclusion With the normal development of China's auto market, the industry's sinking and diversified development will be the trend, and policy formulation needs to be refined and segmented to support development. At present, China's new energy vehicle development is still in its infancy, and it is also a key stage of life and death. Pay attention to the low-speed electric vehicle market and avoid leading the way.
Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells or wellbore.
It is inserted into a well bore and cemented in place to protect both subsurface formations and the wellbore from collapsing and to allow
drilling fluid to circulate and extraction to take place
The oil casing is a steel pipe used to support the well wall of oil and gas wells to ensure the normal operation of the whole well during drilling and after well completion. Several layers of casing shall be used for each well according to different drilling depth and geological conditions. Cement shall be used for cementing after casing is put into the well. It is different from TUBING and drill pipe and cannot be reused. It is a disposable consumable material. Therefore, casing consumption accounts for more than 70% of all oil well pipes.
Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells, or wellbore. It is inserted into a well bore and cemented in place to protect both subsurface formations and the wellbore from collapsing and to allow drilling fluid to circulate and extraction to take place.
Surface casing
- Protects the well from contamination in shallow water and gas layers.
- Supports the wellhead equipment and sustains the weight of the other layers of casing.
Intermediate casing
- Isolates different layers of pressure to facilitate normal circulation of drilling fluid and protect the production casing.
- Intermediate casing facilitates the installation of blow-out preventers, anti-leakage devices and tailpipes in the well.
Production casing (oil string)
- It is the conduit through which oil and gas pass from a below surface reservoir.
- It protects the well and separates fluids into various layers.
First, green pipes are threaded on each end. The threading is then inspected and, if necessary, rethreaded to ensure that the thread accurately connects to the coupling. The threading type includes STC/BTC/LTC. The casing pipes are strengthened by surface treatment and are subject to various inspections, including drifting and hydrostatic tests before they are coated and packaged into casing.
Casing pipes are ordinarily produced with outside diameter sizes of 114.3 mm to 508.0 mm.
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