Thread Protectors

Henan Dongfanglong Machine Manufacture Co., Ltd. was founded in 1999, mainly engaged in oil pipes and pipe fittings, oil special drilling and production tools and oil automation equipments. The company is  named as national integration and standard implementation enterprise, a national science and technology-based small and medium-sized enterprise. With honors of"Henan enterprise technology center", "Henan postdoctoral innovation practice base”, the company hold 35 senior engineers, engineers and technicians, and has successively obtained ISO9001 Quality system certificates,  API 5CT certificate authorized by American Petroleum Institute and BV Quality supplier evaluation certificate issued by company of France. Owing more than 30 independent intellectual property rights, forming an industrial chain integrating design, development, manufacturing, testing and experiment of numerical control automation equipment for petroleum machinery products, which can meet customers' demand for products Full cycle service.The company has established the “Dong Fang Yunlong E-commerce Trading Platform" with oil drilling and production equipment and tools as the radiation point, improved the ability of Internet cross-border e-commerce, and completed the transformation of enterprise from internal operation to building industry alliance. It has built an intelligent workshop, expanded the support of intelligent manufacturing for enterprise operation, created a new intelligent manufacturing mode with high efficiency and flexibility, and improved the core competitiveness of the enterprise. And successfully registered production and sales companies in the Netherlands, opening a new starting point for overseas investment and development.In the future, Dongfanglong will closely focus on national policy orientation and innovation driven development strategy, formulate sustainable development transformation strategy, keep forging ahead, take creating world famous brand and winning honor for the nation as the goal, work together with people of insight from all walks of life for win-win cooperation, and build up the dream of oil equipment manufacturing.

API CouplingAs we know steel pipe coupling is a short pipe or tube that with threads on both ends, used to connect pipelines. So It is a kind of pipe fittings that with threaded connection, the advantage is easy for pipeline maintenance or to replace the broken pipe.API Coupling refers to the steel couplings that used in connecting casing pipe and tubing. Also known by OCTG coupling, it is usually manufactured in seamless type, material grade same with the pipe body (API 5CT K55/J55, N80, L80, P110 etc), same PSL or providing higher grades than requested. Same heat treatment also applicable, except there is an special requirements.API Tubing and Casing Pup JointTubing and Casing Pup Joints are machined according to the latest version of API Spec 5CT. It’s used to connect two pipes of same diameter with the same types of thread on the two ends.The Steel Grade includes J55,K55,N80-1, N80Q, L80-1, P110 etc. There are two types of thread widely used in Tubing pup joint:Non-upset Thread(NUE) and External-upset Thread(EUE)There are three types of thread widely used in Casing pup joint: Long-Round Thread(LTC), Short-Round Thread(STC),Buttress Thread(BTC)There are two types of End thread: Pin*Pin, Pin*Box(Pin*Pin with coupling)API CrossoverCrossover is also kind of pup joint, used to connect two pipes of different diameter with the same or different types of thread on the two ends. The OD, Length and thread type etc. are customized.

Cementing tools are used in the oil and gas industry during the cementing process to ensure proper placement and sealing of cement between the casing and the wellbore. Some common cementing tools include:

1. Centralizers: These tools are used to centralize the casing within the wellbore, ensuring even distribution of cement around the casing. They come in various designs, such as bow spring centralizers and rigid centralizers.

2. Float collars and float shoes: These tools are installed at the bottom of the casing string and contain a check valve that allows cement to flow down but prevents it from flowing back up. They help in maintaining the integrity of the cement column and prevent contamination of the cement during the cementing process.

3. Cementing plugs: These are used to separate different fluids during the cementing process. They are typically made of rubber or composite materials and are inserted at specific intervals in the casing string. They help in displacing drilling mud or spacer fluids with cement and ensure a proper cement bond.

4. Cement baskets: These tools are used to prevent the cement slurry from channeling or bypassing in the annular space between the casing and the wellbore. They are typically placed above and below the zone to be cemented and act as a barrier, forcing the cement to flow through the perforations or the desired zones.

5. Squeeze tools: These tools are used in squeeze cementing operations to repair or seal off zones that are leaking or not properly cemented. They allow for the injection of cement into specific areas of the wellbore to improve well integrity.

These are just a few examples of cementing tools used in the oil and gas industry. The selection of tools depends on the specific well requirements and the objectives of the cementing operation.