How to choose rotary kelly？Suppliers of rotary kelly.
What is rotary kelly?
Rotary kelly is an important component of drilling equipment. It is located at the top of the drill string and usually has several shapes such as square and hexagonal.Rotary kelly consists of three parts: upper joint, lower joint and pipe body. The pipe body is divided into two structures: square and hexagonal (square structure is mostly used in oil drilling); the upper joint is a left-handed female thread (reverse thread), which is connected to the swivel. During the rotation, the left-handed female thread prevents reverse threading; the lower joint is a right-handed male thread, which is connected to the drill pipe. In rotary drilling, the square kelly transmits the rotation of the turntable to the drill string through the square bushing, thereby driving the drill bit to rotate. In addition, the square kelly also bears the suspended weight and counter torque of the drill string to ensure the stable progress of the drilling operation. square kelly is a necessary tool in oil drilling, mainly composed of multi-section joints. Its main function is to transmit power and rotational force, so as to achieve efficient drilling process. In addition, the square kelly also bears the heavy load and shock vibration force in drilling, and has high wear resistance and tensile strength to ensure the stability and durability of the drilling tool.
Structure and function of square kelly
The cross section of the square kelly is square or hexagonal, and the center is made into a circular hole to circulate the drilling fluid. The upper end is connected to the swivel, and the lower end is connected to the drill string. Through the square bushing and the turntable, the ground torque is transmitted to the drill string to drive the drill bit to rotate. The connection between the square kelly and the swivel uses a reverse joint to ensure that it will not be disengaged during the rotation process.
Dimensions of square kelly
Common API square kelly sizes include 2-1/2″(63.5mm), 3″(76.2mm), 3-1/2″(88.9mm), 4-1/4″(109.5mm), 5-1/4″(133.3mm) and 6″(152.4mm) and other specifications.
Precautions for using square kelly
1. The square kelly connection type and buckle type should be reasonably selected according to the conditions required for drilling.
2. The length of the drill tool generally increases with the increase of the well depth. At the same time, the deeper the drilling depth, the diameter of the square kelly will gradually increase to achieve better power transmission and load-bearing capacity.
3. The square kelly needs to be regularly inspected and replaced during use to ensure its normal operation. At the same time, it is also necessary to pay attention to the cleanliness and protection of the use environment to avoid damage from external factors. Before each use, the thread surface and the parts with heavy internal and external wear of the square kelly should be inspected. If it is serious, it should be replaced in time, otherwise it will affect the use.
4. During use, it is necessary to pay attention to vibration control to reduce the damage and wear caused by the vibration of the rod. At the same time, it is also necessary to pay attention to the bearing capacity of the rod to prevent the rod from bending or even breaking due to excessive load.
5. During the transportation and handling of the square kelly, the thread should be equipped with a special wire guard.
6. After each use, it should be cleaned, coated with anti-rust oil and stored in a dry place.
As an important component of oil drilling, square kelly is widely used in various drilling operations, especially in the construction of deep wells, horizontal wells and large displacement wells. It has multiple functions such as transmitting power and rotational force, bearing heavy loads and shock vibration force. During use, it is necessary to pay attention to key factors such as length and diameter matching, regular maintenance and replacement, environmental protection and vibration control, and load-bearing capacity to ensure its normal operation and improve the efficiency and stability of oil drilling.
Supplier of square kelly
When choosing square kelly, you should consider reliable suppliers. Sino Mechanical Equipment has decades of experience in supplying drilling tools and is a high-quality drilling tools supplier in China.
