Drill pipe is an important tool in oil drilling and is mainly used for drilling and drilling operations. According to their uses and characteristics, common oil drill pipe types and their differences are as follows:
1. Drilling and workover riser (Drill Pipe): a pipe used to connect drilling tools and drill bits. It is usually made of non-magnetic steel to prevent magnetism from interfering with logging and geomagnetic exploration. According to different needs, it can be divided into standard drill pipe and high-strength drill pipe.
2. Drill Collar: used to connect two sections of drill pipe to increase the total drill pipe weight, enhance drilling and stabilize the wellbore. According to the shape and use, it can be divided into straight drill string and turbulent drill string.
3. Anchor (Stabilizer): used to stabilize the well wall during drilling and prevent well wall collapse and diameter expansion. According to the form and function principle of stabilizing the well wall, it can be divided into cutting type stabilizer and sliding type stabilizer.
4. Magnetic pressure change detector (MWD) in the drill string: By installing a measuring device in the drill string, downhole drilling parameters, including pressure, temperature, vibration, etc., can be monitored in real time to guide drilling operations. These oil drill pipes play different roles in the oil drilling process and are suitable for different working conditions and needs. Based on the well depth, formation properties and work requirements, drilling engineers will select the appropriate oil drill pipe model to complete the drilling task.
Drill pipe material selection:
Since horizontal directional drilling passes through various strata, the drill pipe faces relatively large pressure, friction and other factors, and needs to have high strength, good toughness, corrosion resistance and wear resistance. The following are several common drill pipe materials and their advantages and disadvantages.
1. High strength alloy steel
This is one of the most commonly used drill pipe materials. It has high strength and toughness and can withstand great tension and pressure. Moreover, this kind of steel has a long life and is not easy to rust and wear. However, the price of high-strength alloy steel is relatively high, which is not conducive to cost savings. Additionally, if it is not properly maintained, problems such as embrittlement and deterioration can occur.
2. Manganese steel
Manganese steel materials perform well in terms of corrosion resistance, wear resistance and toughness. Due to its relatively low strength, the structure needs to be strengthened during design to ensure its tension and compression. However, this type of steel is relatively cheap compared to other steel types. Note that manganese steel may deform during drilling.
3. Stainless steel
In horizontal drilling rig mud, stainless steel exhibits good corrosion resistance and can maintain the integrity of the drill pipe. However, the relatively low hardness of stainless steel makes it unsuitable for drilling operations that require use under strong vibration. Additionally, stainless steel has limited chemical resistance to corrosive slurries.
4. Titanium alloy
Titanium alloy materials have excellent performance in terms of oxidation resistance and corrosion resistance. Due to its low density and relatively light weight, it is ideal for horizontal drilling at greater depths. However, titanium alloys are more difficult to manufacture and more expensive.
What is the length of oil drill pipe?
The length of oil drill pipe is generally about 9 meters and the diameter is 5 inches. In addition, oil drill pipes are all rolled seamless steel pipes. In order to strengthen the connection strength between the pipe body and the joint, both ends of the drill pipe body are roughened and thickened. The thickening form is divided into internal thickening and external thickening according to API standards. There are three types: internal thickening and external thickening. The thickened transition section is generally 20~65mm long, and the longest can be 120~130mm.
