The new composite drill pipe (CDP) is made of carbon fiber and epoxy resin. The principles are with high temperature curing the metal core shaft, and then extract the core shaft, the curing of the pipe section to complete the processing. Final preparation involves the addition of standard elastomeric centralizers before the pipe is run in the hole. Both the centralizers and the abrasion resistant coating can be repaired in the field. More serious wear can be in plant maintenance as long as it is not completely destroyed. Mechanical properties of CDP are similar to that of steel but less than half the weight of steel.
This applied in the mold, to establish the required thickness of the material.The process is faster and cheaper than wet lay-up, but mechanical properties are lower.The process is typically used for large, relatively simple structures such as bathtubs, boat hulls and storage tanks.
This process can generate a high surface finish of the metal plate, mainly used in the automotive industry.The high investment in heated tooling means that the process is only suitable for medium to high volume production.
Bulk moulding compound is heated and injected into a heated mould, where it is held under pressure until the resin has cured. The process is used for relatively small components for which a short cycle time can be achieved. The high cost of tooling means that the process is suitable only for medium to high volume production.
The process is suitable for complex, highly-loaded parts, and is used in a wide range of industries. Tools that reduce the load, and therefore allow for cheaper, larger tools to be used to manufacture large structural ship hulls or wind turbine blades
The process is designed to achieve the required thickness of the fiber, the use of high temperature when necessary. In the process, pre-impregnated fibre tows or slit prepreg can be used, the removal of waste using a resin bath but need high temperature curing stage.
Combined with the previous model, cured resin obtained uniform extrusion part.The process can be automated and uses low-cost raw materials, making it suitable for high volume applications.
Prepreg (pre-impregnated fibre) consists of fibres, fabrics or mats impregnated with resin. Thermosetting prepregs include hardeners in the resin, and therefore have a limited shelf life and are usually stored under refrigeration. Before use, the prepreg is brought to room temperature to avoid condensation. Prepreg is used where high mechanical properties are required and the high cost of processing can be justified. Examples include aerospace structures, sporting goods and wind turbine blades.
As the oil and gas production environment and conditions become more and more complex, the drilling cost and drilling risk continues to improve, the traditional sense of the drill pipe has been unable to meet the use requirements. A new generation of drill pipe towards high strength, high toughness, intelligent, digital, corrosion, safety and environmental protection direction. Thus it causes oil drill pipe manufacturers and materials manufacturers more concerned about the super high strength drill pipe,whose purpose is the adaptability of the improvement of drilling pipe. With the continuous improvement of manufacturing process and improvement, the price of the product is constantly improved, and the new generation of drill pipe will be further development and wide application, which provide strong support for oil and gas exploration and development.
