Thread compound is a kind of auxiliary sealing material specially used in oil casing and thread of drilling tool in oil drilling and completion business.
The thread compound can play a sealing and lubricating role to prevent the oil casing and the drill thread from being damaged by friction during use. According to the use difference, thread compound can be subdivided into oil casing thread sealing grease and drilling tool thread compound. The main function of the sealing grease of the oil casing thread is to lubricate and seal, ensure that there is no sticking during the process of up and down, and that the sealing of the thread after the casing is placed has high air tightness and no leakage. The main function of drilling thread compound is to ensure that the drilling thread is not stuck when the torque is high, and the lubrication resistance to extreme pressure is good, and there is no requirement for sealing.
According to the different properties, the thread compound can be divided into lead based thread compound, zinc based thread compound, copper based thread compound, non-metallic thread compound, etc., of which non-metallic thread compound can be biodegradable, also known as environmental protection thread compound, the following talk about the characteristics of each thread compound.
Lead based thread compound is characterized by softness, can be completely sealed, and can absorb the upper buckle pressure energy, so if the rotary shoulder joint uses lead based thread compound, it can withstand about 20 percent less pressure than the use of zinc based thread compound.
The characteristics of zinc-based thread compound are not too soft, can not be completely sealed, the property is more active, can not reduce the pressure, but under the same conditions, zinc-based thread compound is tighter than lead based thread compound.
Copper base thread compound is characterized by softness between lead base and zinc base, its performance is better than most lead base thread compound and zinc base thread compound, and can better solve environmental problems, but must withstand high temperature and high pressure during drilling.
Non-metallic thread compound combines the advantages of the above various thread compound, soft, completely sealed, safe, environmental protection, etc., in terms of performance, non-metallic thread compound is also very good, after use can be biodegradable, thus harmless to the environment, there are no side effects on Marine life, so it has been widely used in oil drilling. The typical representative products of this kind of thread compound are such as the United States Liquid-O-Ring 318(oil casing special), 236(drilling tool special) and TC30(oil casing and drilling tool general). (2023-10-10)
