With the decreasing of oil reserves in the near-surface layer, ultra-deep wells, high-angle wells and large displacement gradually replaced the traditional shallow and small displacement wells, which became the main way of oil drilling, and a large number of offshore oil drilling platforms appeared. The consequent problem is that the drilling time is greatly extended and the lateral force of the grooved drill pipe acting on the casing is increased from time to time, resulting in more prominent wear of the grooved drill pipe and the casing.
Oil grooved drill pipe joint is a key component in the process of oil drilling, with the development of modern drilling technology from time to time, the request for the wear resistance of grooved drill pipe joint is progressing from time to time. Therefore, the improvement of the wear resistance of the oil groove drill pipe joint, the extension of its service life, and the improvement of drilling efficiency are the engineering practice problems that need to be dealt with urgently.
1. grooved drill pipe joint wear belt:
Since the slotted drill pipe joint receives severe wear and erosion wear at the same time, the slotted drill pipe joint wears quickly. In order to improve the wear resistance of the grooved drill pipe joint, the grooved drill pipe joint wear belt is presented. The so-called grooved drill pipe joint wear belt is to maintain the grooved drill pipe from excessive wear during drilling. The wear-resistant welding wire is surfacing and spray welding along the circumferential direction of the grooved drill pipe joint. The annular belt with a width of about 30-50mm and a thickness of 2-3mm is called the grooved drill pipe joint wear belt. The wear-resistant belt of the slotted drill pipe joint plays a key role in dealing with the wear of the slotted drill pipe and the casing because it has the advantages of better wear resistance than the slotted drill pipe joint itself and can reduce the wear of the casing.
Surfacing and spray welding, as an important manufacturing and maintenance method in modern data processing and manufacturing industry, are commonly used to improve the service life of grooved drill pipe joints and reduce the wear resistance of grooved drill pipe joints. People have developed a variety of materials of alloy powder or flux-cored wire to bring better wear resistance and corrosion resistance to the wear-resistant belt of the groove drill pipe joint. At the same time, the developed high hardness wear-resistant alloy system surfacing layer can also be used for the repair and manufacture of wear-resistant parts in other industrial sectors.
The following is a brief introduction to the common surfacing technology and hardness of the wear-resistant belt of grooving drill pipe joints.
2. open arc surfacing with flux-cored welding wire surfacing with grooved drill pipe joint wear-resistant belt:
Advantages of wear-resistant belt for open arc surfacing grooved drill pipe joints:(1) simple equipment and convenient operation;(2) No preheating before welding, no heat treatment after welding, high welding efficiency and saving energy;(3) Supporting dust extraction system, no smoke and dust around the welding machine, good working environment; (4) Low dilution rate of weld bead, good corrosion resistance and wear resistance. Suitable for drilling, coal mining, mining machinery repair and other field operations.
Grooving drill pipe joint surfacing more than the use of single-layer weld, the size of the request is more severe. Such as the YD-100 of flux cored wire in the welding process of weld forming better, less spatter. And the YD-100 flux cored wire single layer surfacing weld Rockwell hardness value compared to the average, in the HRC60 or so.
Wear-resistant belt of grooved drill pipe joint surfacing welding with plasma spray welding alloy wire 3:
The wear-resistant belt of grooved drill pipe joints used in most oil fields in China is processed by plasma spray welding technology. After spray welding, the hardness of the wear-resistant belt is about 55HRC. D100 alloy welding wire is used for spray welding of grooved drill pipe joints. The weldments are not preheated before welding, are not kept warm after welding and have repeated weldability, and the cost is reduced and the process is complicated. The wear belt data of this flux-cored welding wire show that the casing wear is reduced by 86% compared with the steel grooved drill pipe joints. Compared with grooved drill pipe joints treated with tungsten carbide, casing wear is reduced by 76%, due to the reduction of friction coefficient, the rotation resistance of drilling tools is greatly reduced, the torque is increased by 30%, and the fuel consumption is saved by 10%. Under the open hole drilling environment, the groove drill pipe joint is maintained more horizontally, and the wear is reduced.
D100 about slotted drill pipe joint wear belt can also be repeatedly surfacing welding. Groove drill pipe wear-resistant belt wear serious groove drill pipe, the original wear-resistant belt re-welding new wear-resistant belt (width unchanged), the welding layer does not show the phenomenon of block loss and peeling, wear average, repeated welding.
4. Use oxygen-acetylene flame spray welding technology to surfacing groove drill pipe joint wear belt:
Oxygen-acetylene flame spray welding technology has the advantages of simple equipment, sensitive operation, low cost, etc., the use of nickel-based self-fluxing alloy powder spray welding groove drill pipe joints should pay attention to the flame spray welding process, if the spray welding process is improper, the spray welding layer will often present a large number of dense pores, so that cracks in the edge of the alloy block, so the use of oxygen-acetylene flame spray welding should pay attention to:(1) the workpiece preheating and adhere to spray welding powder dry;(2) to ensure the appropriate roughness of the surface of the substrate, the surface of the grooved drill pipe joint substrate has a moderate unevenness to improve the separation force between the spray welding layer and the base metal, but not the more rough the separation force is stronger;(3) Pure control spray welding operation technology. Only to ensure the above process request, can reduce the defects such as pores and micro cracks, so as to improve the service life of the drill pipe joint.
5. how to cut the wear-resistant belt of the grooved drill pipe joint after surfacing and spray welding:
After surfacing and spray welding, the hardness of the grooved drill pipe joint is generally above HRC50, and the hardness is high and difficult to process. At present, the cutting tool materials for processing high hardness include hard alloy cutting tools, ceramic cutting tools and cubic boron nitride cutting tools with nonmetallic adhesive BN-S20 grades.
(1) Hard alloy cutting tool machining groove drill pipe joint wear belt: Because the hardness of the hard alloy cutting tool itself is between HRC71-76 and 45, the hard data below HRC45 is suitable for processing, so the machining groove drill pipe joint wear belt will show the phenomenon that the cutting tool is not wear-resistant, and the processing effect cannot be improved, the cutting tool cost is high, and the overall economic benefit is affected.
(2) Ceramic cutting tools are selected to process the wear-resistant belt of grooving drill pipe joints: the hardness of ceramic cutting tools is higher than that of hard alloy cutting tools, and the hardness of the tool body itself is between HRC95-100 and the lower. However, ceramic cutting tools have one of the biggest defects: large brittleness, low transverse fracture strength, and weak ability to accept impact load. Therefore, ceramic cutting tools are a better choice when cutting hardness is lower than HRC55 and small feed rate.
(3) Select the super hard non-metallic adhesive cubic boron nitride tool BN-S20 brand machining groove drill pipe joint wear belt: China's super hard is a set of cutting tool design, research, manufacturing, sales and service as one of the company. From time to time efforts to develop, to provide customers with professional and efficient cutting tools, cutting tool plans, and from time to time to improve the quality of production and consumer manufacturing technology, professional position has been recognized by the differences between enterprises from all walks of life, to help automotive, aerospace, power equipment, mining machinery and other industries to invent a more wonderful new century.
Superhard non-metallic binder cubic boron nitride tool BN-S20 grades are specially developed for the wear-resistant belt of grooved drill pipe joints. Compared with the traditional cubic boron nitride tool, the BN-S20 grade of cubic boron nitride tool with nonmetallic adhesive increases toughness, not only has higher hardness, but also has both wear resistance and impact resistance. There is no upper limit on the depth of cutting, the wear-resistant layer of the drill pipe joint with large allowance does not collapse, and the processing efficiency is improved and the processing cost is reduced. Suitable for batch processing of grooved drill pipe wear belt above HRC45.
6. summary:
With the development of drilling technology from time to time and the demand for exploration and development, the use of drilling tools is more stringent, the use of surfacing welding, spray welding technology to promote the development of the drilling industry, but surfacing welding, spray welding parts for embarrassing cutting data once limited the processing efficiency and consumption costs of the grooving drill pipe manufacturing industry. After that, with the metabolism of new materials, new technologies and new processes in the tool industry, the development of the grooving drill pipe manufacturing industry has been promoted.
Choose high-quality drilling pipe, please identify the beneficial mining drilling tools.
