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Maintenance and Management of Geological Drill Pipe after Use
Release time:
2021-09-22
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As an important part of the whole drill string, drill pipe is widely used in hydrological survey, geological drilling, oil and gas exploration and other fields. The quality of drilling tools, on-site maintenance and utilization, drilling accidents, construction costs and so on have a significant impact. The following Huanye Machinery Editor only discusses the use of friction welding drill bits and the maintenance management of the construction site, and discusses its surface knowledge. At present, there are four kinds of drill pipes in China's oil and gas industry: E75, X95, G105 and S135 steel grades. The drill pipe joints are mainly SAE4137H pipes, with drill pipe diameters of 23/8-65/8 and many specifications. The higher the steel grade, the higher the strength and the stronger the bearing capacity. But must
drill pipeAs an important part of the whole drill string, it is widely used in hydrological survey, geological drilling, oil and gas exploration and other fields. The quality of drilling tools, on-site maintenance and utilization, drilling accidents, construction costs and so on have a significant impact. The following Huanye Machinery Editor only discusses the use of friction welding drill bits and the maintenance management of the construction site, and discusses its surface knowledge.
At present, there are four kinds of drill pipes in China's oil and gas industry: E75,X95,G105andS135Steel Grade,Drill pipe joints are mainlySAE4137H,Diameter of drill pipe23/8-65/8,More specifications. The higher the steel grade, the higher the strength and the stronger the bearing capacity. But it must be noted that when choosing a drill pipe, the higher the strength, the better. In the drilling fluid medium,As the steel position increases,The corrosion fatigue strength of the drill pipe will be reduced. In order to meet the strength requirements, according to the principle of selecting the lowest horizontal drilling pipe as much as possible, it is recommended that users select the most suitable drilling pipe according to the site, thereby reducing procurement costs and the possibility of accidents.
1. Overall structure of friction welding drill pipe
Friction welding drill pipe consists of inner and outer screw joints and drill pipe body. The drill pipe rotates under the drive of the rotary table or power head to transfer the power to the bottom of the drill bit,The drilling fluid is transferred to the cutting surface of the drill bit.
At present, there are two kinds of friction welding drilling standards produced by most drilling companies in China: SY/114-24 the People's Republic of China Oil and Gas Industry Standard and American Petroleum InstituteP5PDrill pipe standards. These two standards clearly define the parameters and performance of drilling pipe body, joint, friction welding area and other components.
2. Use and management of drilling tools on construction sites
Pre-drilling can stop downhole water
Before using the drill pipe in the well, the female connector should be placed in an effective drill pipe rack.,There are enough piers above,Above0.3m to prevent corrosion of drill pipe. The drill pipe rack shall be kept parallel to the plane to prevent the bending deformation of the drill pipe.
Thoroughly clean and inspect drill pipe joint threads and shoulder sealing surfaces to confirm they are serviceable prior to drilling in front of the rig. During the drilling process, the drill pipe joints must be installed with steel wires,To prevent collision and damage to the joint threads and abutment.
The winch should be kept as soon as possible when the boom is raised along the slide. When the drill pipe is removed from the sliding rod, the soft rope should be manually stopped to prevent collision.
Use 60% fine metal lead powder or4060%Fine metal zinc powder oil lock oil machine oil drilling tool,Before a single connection to the wellhead,Clean joint threads and shoulder sealing surfaces.
Drill pipe use considerations:
When using a new drill pipe for the first time, it is recommended to rotate it twice at the wellhead,Torque slightly below specified value. After confirming that the joint thread and sealing surface are in good condition,Press joint thread,Use in wells. The use of this grinding button is beneficial to strengthen the surface hardness of the thread, improve the adhesion of the thread, and extend the service life of the drill bit.
When the drill pipe is located at the wellhead joint, it must be corrected manually to prevent the normal joint from hitting the end face or thread of the female joint and causing damage. Then use chain tongs to manually identify the bolts and use hydraulic tongs to tighten the screws.
The drill string should be replaced and unloaded before each derrick, so that the drill string runs up and down during the three drilling processes, so that each drill bit can be checked in time to reduce problems such as ring, buckle, perforation and leakage. At the same time, the position of the upper and lower drilling tools should be changed regularly to change the stress state of the drilling tool, so that the stress of each part of the drilling tool tends to be consistent, thereby improving the service life of the drilling tool and reducing the occurrence of early failure.
During the drilling process, reasonable drilling speed and pressure should be selected according to the formation, diameter and structure of the drilling tool,To ensure that the drilling tool works in the ideal working condition,Achieve satisfactory drilling efficiency. When the drill pipe speed reaches the critical speed,The vibration frequency of the three kinds of drill pipe rotation is consistent with the natural frequency of the drill pipe.,will cause resonance,leaving the entire drill pipe in a severely unstable state,Withstand additional fatigue stress,So as to accelerate the fatigue failure of drilling tools,The higher the bit pressure,The greater the resistance of the drill bit,Broken drill bit.
When the drill pipe is used in a corrosive environment, deoxidizers and corrosion inhibitors can be added to the drilling fluid, and the pH value of the drilling fluid can be increased10Above, choose sulfur-resistant drill pipe, use inner coating drill pipe, and choose appropriate measures, such as low-grade drill pipe, to reduce the influence of corrosion factors.
When unloading the drill pipe at the wellhead, low speed gear should be used first,The hook spring should maintain a certain tension,to maintain pressure between the two joint threads. When the joint thread is completely disassembled,The hook will rise,To prevent the upper tube from being pulled,This also prevents the upper tube from colliding with the wellhead joint.
Maintenance Management of Drill Pipe after Use
After drilling, the drilling tools shall be arranged on the drill frame according to different specifications, wall thickness, eye size, steel grade and grade. Clean the inner and outer surfaces, joint threads, and bridge shoulder covers with water in time, and thoroughly clean and dry. Check whether the surface of the drill pipe has cracks, scratches, thread integrity, whether the joint is partially worn, whether the shoulder surface is flat, whether there is wear, whether there are bending bite marks of the pipe body, whether there are corrosion, pits and other defects inside and outside the drill pipe. In order to reduce the occurrence of failure accidents such as joint thread fracture and drilling leakage, the drill pipe body should be subjected to ultrasonic test, magnetic particle test and magnetic particle test. There is no problem with the thread and the shoulder drill on the anti-rust oil cover.
Drill pipes shall be marked with paint on site and stored separately to prevent misuse. And drill pipe repair, replacement problems, so as not to affect the later construction. Long-term use of outdoor drill pipe, the use of rain-proof waterproof cover, regular inspection of the drill pipe internal and external surface corrosion, do a good job of moisture-proof and anti-corrosion work.
Key words:
Geology, drill pipe, thread, joint, use, drilling, prevent, drill bit, joint, choose
