What is the function of drill pipe thread oil
2025-12-30
Drill pipe thread oil is a specialized lubricating and protective oil for drill pipe connection parts. Its core function is to lubricate and reduce drag, seal and prevent leakage, prevent corrosion and rust, and prevent sticking and biting. All four functions are indispensable, directly ensuring the service life of drill pipe threads, drilling operation safety, and construction efficiency. The specific functions are disassembled as follows:
Lubrication and drag reduction to reduce thread wear: When connecting drill rods, high-strength tightening is required. Thread oil can form a uniform oil film on the contact surface of the thread profile, greatly reducing the frictional resistance during the tightening process, avoiding scratches and wear on the thread crest and flank due to dry friction, and making the tightening torque more uniform to ensure connection firmness and reduce the risk of premature thread failure.
Sealing and leakage prevention, isolation of drilling medium: During drilling, the drill pipe is filled with high-pressure drilling fluid internally, while the outside comes into contact with mud and formation water. The thread oil fills the thread gap to form a high-pressure sealing layer, which can prevent the leakage of high-pressure drilling fluid from the thread and block the infiltration of external mud and sewage into the thread gap, avoiding the accumulation of scale in the gap and affecting subsequent disassembly. At the same time, it prevents the drilling fluid from corroding the core part of the thread.
Corrosion and rust prevention, extending thread life: Drilling conditions are often humid, acidic, alkaline, salt spray environments, and drill pipe threads are exposed to corrosive media such as drilling fluid and formation water for a long time. Thread oil can form a long-term protective film on the surface of the thread, isolating oxygen, moisture, and corrosive substances, preventing thread corrosion and pitting, avoiding a decrease in thread strength, extending the overall service life of the drill pipe, and reducing the cost of drill pipe replacement.
Anti sticking buckle ensures smooth disassembly and assembly: During the drilling process, the drill pipe is subjected to high-frequency vibration, high-pressure load, and high temperature environment, and the threads are prone to sticking due to stress concentration and high temperature adhesion (thread biting cannot be disassembled), which can lead to thread biting being scrapped in severe cases; Threaded oil can withstand high temperatures and extreme pressures, maintain oil film stability under harsh working conditions, effectively prevent thread biting and adhesion, ensure smooth disassembly and assembly of drill pipes during drilling and tripping, and avoid shutdown accidents caused by thread sticking.
Resistant to extreme pressure and impact, suitable for harsh drilling conditions: During drilling, the drill pipe threads need to withstand huge torque, axial tension, and impact loads. High quality drill pipe thread oil has strong extreme pressure and anti-wear properties, which can withstand high pressure and heavy load without breaking the oil film, buffer the impact stress borne by the threads, prevent thread deformation and tooth breakage, and adapt to complex drilling scenarios such as deep wells and high-pressure wells.
Assist in heat dissipation and alleviate high temperature of threads: High speed rotation and high-pressure friction of drill rods can cause local high temperature in the threaded area. Thread oil can take away some heat during lubrication, alleviate high-temperature oxidation of threads, avoid oil film failure due to high temperature, and further ensure the sealing and durability of threads under high temperature conditions.
Lubrication and drag reduction to reduce thread wear: When connecting drill rods, high-strength tightening is required. Thread oil can form a uniform oil film on the contact surface of the thread profile, greatly reducing the frictional resistance during the tightening process, avoiding scratches and wear on the thread crest and flank due to dry friction, and making the tightening torque more uniform to ensure connection firmness and reduce the risk of premature thread failure.
Sealing and leakage prevention, isolation of drilling medium: During drilling, the drill pipe is filled with high-pressure drilling fluid internally, while the outside comes into contact with mud and formation water. The thread oil fills the thread gap to form a high-pressure sealing layer, which can prevent the leakage of high-pressure drilling fluid from the thread and block the infiltration of external mud and sewage into the thread gap, avoiding the accumulation of scale in the gap and affecting subsequent disassembly. At the same time, it prevents the drilling fluid from corroding the core part of the thread.
Corrosion and rust prevention, extending thread life: Drilling conditions are often humid, acidic, alkaline, salt spray environments, and drill pipe threads are exposed to corrosive media such as drilling fluid and formation water for a long time. Thread oil can form a long-term protective film on the surface of the thread, isolating oxygen, moisture, and corrosive substances, preventing thread corrosion and pitting, avoiding a decrease in thread strength, extending the overall service life of the drill pipe, and reducing the cost of drill pipe replacement.
Anti sticking buckle ensures smooth disassembly and assembly: During the drilling process, the drill pipe is subjected to high-frequency vibration, high-pressure load, and high temperature environment, and the threads are prone to sticking due to stress concentration and high temperature adhesion (thread biting cannot be disassembled), which can lead to thread biting being scrapped in severe cases; Threaded oil can withstand high temperatures and extreme pressures, maintain oil film stability under harsh working conditions, effectively prevent thread biting and adhesion, ensure smooth disassembly and assembly of drill pipes during drilling and tripping, and avoid shutdown accidents caused by thread sticking.
Resistant to extreme pressure and impact, suitable for harsh drilling conditions: During drilling, the drill pipe threads need to withstand huge torque, axial tension, and impact loads. High quality drill pipe thread oil has strong extreme pressure and anti-wear properties, which can withstand high pressure and heavy load without breaking the oil film, buffer the impact stress borne by the threads, prevent thread deformation and tooth breakage, and adapt to complex drilling scenarios such as deep wells and high-pressure wells.
Assist in heat dissipation and alleviate high temperature of threads: High speed rotation and high-pressure friction of drill rods can cause local high temperature in the threaded area. Thread oil can take away some heat during lubrication, alleviate high-temperature oxidation of threads, avoid oil film failure due to high temperature, and further ensure the sealing and durability of threads under high temperature conditions.
