XUZHOU E AND P PETROLEUM EQUIPMENT CO., LTD.: Elevating Oilfield Performance with Premium Casing CouplingsCasing coupling
In the high-pressure, high-stakes environment of oil and gas drilling, casing couplings serve as the critical backbone of wellbore integrity. These precision-engineered components connect casing strings, ensuring structural stability, pressure containment, and resistance to corrosion in extreme downhole conditions. Their reliability directly impacts operational safety, environmental protection, and long-term well productivity.
XUZHOU E AND P PETROLEUM EQUIPMENT CO., LTD., a China-based leader specializing in oilfield coupling solutions, has dedicated 17 years to perfecting the science of casing coupling manufacturing. Guided by its quality philosophy of “Innovation-Driven R&D, Rigorous Quality Control, Continuous System Improvement, and Customer-Centric Excellence,” the company has risen to prominence as a trusted partner for domestic and global energy operators.
Commitment to Quality and Innovation
XUZHOU E AND P’s success stems from its uncompromising adherence to global standards:
Certifications: API 5CT (American Petroleum Institute), ISO 9001 (Quality Management), ISO 14001 (Environmental Management), and ISO 45001 (Occupational Health & Safety).
Product Liability Insurance: Additional assurance for clients, reinforcing confidence in every coupling delivered.Casing coupling
The company’s vertically integrated production process—from raw material sourcing to final inspection—ensures traceability and consistency. Advanced testing equipment, including impact testers, tensile strength analyzers, and magnetic particle flaw detectors, guarantees zero-defect outcomes.
Why XUZHOU E AND P Stands Out
Technological Edge: Continuous R&D investment drives innovations in material science, thread design, and anti-corrosion coatings, enhancing product lifespan even in sour gas or ultra-deep wells.
Tailored Solutions: Over 100 specialized thread inspection tools and custom engineering capabilities enable couplings tailored to unique well specifications.
Customer-Centric Service: A unique packaging system, streamlined logistics, and 24/7 technical support ensure seamless collaboration from inquiry to delivery.Casing coupling
Global Impact, Local Expertise
With a reputation built on precision and reliability, XUZHOU E AND P serves major domestic players like Sinopec and CNPC while expanding its footprint across the U.S., Middle East, and Asia-Pacific markets. Its couplings are trusted in diverse applications:Casing coupling
Conventional and Unconventional Wells
High-Temperature/High-Pressure (HTHP) Reservoirs
Offshore and Onshore Drilling
Driving the Future of Energy InfrastructureCasing coupling
As the industry evolves, XUZHOU E AND P remains at the forefront of sustainable innovation. By integrating smart manufacturing technologies and eco-friendly practices, the company aligns with global energy transition goals while delivering couplings that exceed performance benchmarks.Casing coupling
1. Different port positioning: FOB usually refers to the port in the seller's country, while CIF specifically refers to the port in the buyer's country. 2. Cost structure differences: FOB mainly covers the ex factory price of goods, export customs clearance fees, and related expenses for loading goods into the buyer's designated cabin, with additional seller profits. In contrast, CIF adds ocean freight and insurance fees on top of FOB price. 3. Different insurance treatments: Under FOB terms, insurance matters are handled by the buyer, and the seller needs to notify the buyer before shipment. In CIF terms, the seller is responsible for handling and paying the insurance premium. The seller also needs to handle the insurance according to the contract terms and insurance terms, and hand over the insurance policy to the buyer. 4. Different shipping arrangements: Under FOB conditions, the buyer is responsible for designating a shipping company or freight forwarding company for shipping arrangements, which may affect the seller's delivery time and bank document submission process. Under CIF conditions, the seller has the right to independently choose the shipping company or freight forwarding company. 5. Different loading notification times: Under FOB terms, the seller must notify the buyer of the loading content and details before loading to ensure that the buyer has sufficient time to handle marine insurance. Under CIF terms, as insurance is handled by the seller, the shipping notice can be notified to the buyer within a few days after shipment. 6. The risk of force majeure varies: under CIF terms, the seller is responsible for handling insurance and purchasing it at the port of departure. In the event of customer refusal or cancellation, the seller can claim compensation from the local insurance company with the insurance policy. Under FOB terms, insurance is handled by the buyer, and the policy is held by the buyer. Moreover, insurance companies are mostly located abroad, making it difficult for the seller to claim compensation from them and obtaining evidence.
Tubing coupling is a type of drilling tool used in oil fields, mainly for connecting tubing. The design of oil pipe couplings solves the problem of fatigue and fracture easily caused by stress concentration in existing couplings. Its structural features include: The end of the oil pipe is connected to the inner wall of the coupling body through a tapered thread. The end of the coupling body is connected to the oil pipe through the same thread and the same pitch flat thread method. This design has the characteristic of relieving stress concentration at the root of the external thread of a single cone thread connected oil pipe, making it less prone to fatigue fracture and effectively preventing the occurrence of oil well string breakage accidents. The commonly used steel grades for oil pipe couplings include J55, K55, N80, L80, P110, etc. The selection of these steel grades depends on the specific usage environment and requirements. The use of tubing couplings not only improves the safety and efficiency of oilfield drilling operations, but also provides important technical support for oil extraction. In addition, there are various types and specifications of tubing couplings, which can be selected and customized according to different drilling needs to meet the drilling operation requirements under various complex geological conditions.
The casing coupling is a key component used in oil drilling and extraction, mainly used to connect the casing and ensure the smooth progress of drilling operations. It is a petroleum term approved by the National Science and Technology Terminology Review Committee in 1994, and belongs to the field of petroleum engineering. The function of casing coupling is to strengthen the connection of casing, improve its structural strength and sealing performance, in order to cope with complex geological conditions that may be encountered during drilling, such as collapse layers, oil layers, gas layers, etc. Different types of casing couplings are made of different materials and designed according to their usage environment and functions to ensure the safety and efficiency of drilling operations. For example, technical casing is used in the drilling process of complex formations. When encountering collapsed layers, oil layers, gas layers and other complex parts, technical casing needs to be installed for sealing, otherwise drilling cannot proceed. These casing couplings require high mechanical and sealing performance, and use high-grade steel to ensure the safety and efficiency of drilling operations. In addition, the design and manufacturing of casing couplings involve multiple considerations, including material selection, dimensional accuracy, connection methods, etc., to ensure that they can adapt to various extreme working environments. For example, certain specially designed casing couplings can effectively alleviate stress concentration, reduce the risk of fatigue fracture, and thus improve the safety and reliability of oil wells3. In summary, casing couplings are essential components in oil drilling and extraction, and the quality of their design and manufacturing directly affects the success of drilling operations.
Tubing couplings are mainly used in oilfield drilling tools, specifically for connecting tubing. Its design aims to solve the problem of fatigue fracture that may occur in existing couplings due to stress concentration. The structural characteristics of the oil pipe coupling include the connection of the oil pipe end and the inner wall of the coupling body in a conical thread manner, while the end of the coupling body is connected to the oil pipe in a flat thread manner with the same thread and pitch. This design helps alleviate the problem of stress concentration at the root of the external thread of the oil pipe connected by a single conical thread, making it less prone to fatigue fracture and effectively preventing the occurrence of oil well string breakage accidents. In contrast, casing couplings are mainly used to protect the wellbore, prevent wellbore collapse or deformation, and ensure the smooth progress of drilling operations. It is usually used together with casing short sections to form an important component in oil drilling and extraction. Overall, tubing couplings focus on connecting and protecting tubing, while casing couplings are more focused on protecting the stability of the wellbore and drilling process. These two types of couplings play an indispensable role in oil and gas extraction, each playing a unique role.
