The anti-viscosity of oil casing depends on thread parameters to a great extent. Reasonable control of thread parameters can improve the anti-viscosity of oil casing. The research shows that the single parameter of API thread should not be studied as the main control parameter. The adhesion resistance of thread is related to the surface roughness. If there are burrs on the starting thread, this increases the coefficient of friction, which increases friction and facilitates adhesion. On the other hand, if the surface of the thread is not rough, the coefficient of friction and friction are smaller, which is more unfavorable for the appearance of the hook.
Petroleum casing understands that modeling experiments can be used to demonstrate the correlation between surface roughness and hooking properties. It was found that there is a strong relationship between hooking properties and surface roughness. When modeling is fast enough, sticking may occur even at low pressures. In conclusion, most studies have shown that decreasing the roughness of the thread surface increases the resistance of pipe threads and vice versa. The environment for oil and gas exploration is very difficult. In order to meet the requirements of high pressure and high temperature environments, petroleum casing manufacturers around the world have progressively introduced special types of petroleum casing that are adapted to harsh environments. These special high-performance buckles make it easy to bend and not easy to wrongly buckle during inspection; they have outstanding anti-adhesive properties and can be repeatedly shackled without damaging the threads.
In the threading of petroleum casing, the geometric parameters of the threads have different degrees of influence on the taper and pitch of the casing as well as the adhesion resistance of the tooth angle. In order to improve the sealing performance of round threads, in addition to soft metals and sealants with excellent performance, it is very important to control the tolerance zone of petroleum casing threads.