There are three main differences between oil casing pipe and oil drill pipe: 1. different uses; 2. different functions; 3. different materials.
1.Uses of oil casing pipe and oil drill pipe:
Oil casing is a steel pipe used to support the well wall of oil and gas wells to ensure the normal operation of the entire oil well during the drilling process and after completion. Each well will use several layers of casing according to different drilling depths and geological conditions. Cement is used to cement the casing after it goes down the well. It is different from tubing and drill pipe and cannot be reused. It is a disposable material. Therefore, the casing consumption accounts for more than 70% of all oil well pipes. The casing can be divided into: casing, surface casing, technical casing and oil layer casing according to the usage.
The drill pipe is a steel pipe with a thread at the end, which is used to connect the surface equipment of the drilling rig with the drilling and grinding equipment or bottom hole device at the bottom of the drilling well. The purpose of the drill pipe is to transport the drilling mud to the drill bit, and together with the drill bit to raise, lower or rotate the bottom hole device. The drill pipe must be able to withstand huge internal and external pressure, twist and bend
And vibration. In the process of oil and gas extraction and refining, drill pipes can be used multiple times. Drill rods are divided into three categories: square drill rods, drill rods and weighted drill rods. The connection sequence is square drill pipe (1 piece) + drill pipe (n pieces, determined by the well depth) + weighted drill pipe (n pieces, determined by the design of drill tool assembly).
2.The role of oil casing pipe and oil drill pipe:
The oil casing is used to reinforce the well wall, and the inner and outer diameters are much larger than the drill rod; the drill rod is used to connect the drill collar and the drill bit, and the length is sufficient to support the drill bit in the downhole operation. Regardless of function or size, they are all different.
The drill pipe is a rod member connected in the drilling tool to transmit power. The usual components of a drill string are: drill bit, drill collar, drill rod, stabilizer, special joint and square drill rod. The basic functions of the drill string are: (1) lifting the drill bit; (2) applying drilling weight; (3) transmitting power; (4) delivering drilling fluid; (5) performing special operations
Industry: Squeeze cement, handle underground accidents, etc.
3.Material of oil casing pipe and oil drill pipe:
There are many kinds of oil casing materials, the basic ones are ordinary carbon steel, J55, L80, N80, P110, etc., and then more special materials, such as 3Cr, 9Cr, 13Cr, 22Cr, etc., mainly to prevent carbon dioxide and sulfidation Hydrogen materials, such as 90SS, 95SS, etc. In addition, there are higher-grade, nickel-chromium alloy tubes. Depending on the manufacturer, the number is different and there are some special needs, such as high crush resistance materials, some The manufacturer will add TT to indicate crush resistance.
Petroleum drill pipe: API standard E75 to S135 steel grade, outer diameter from 2 3/8 ″ to 6 5/8 ″ series of petroleum drill pipe, double shoulder joint drill pipe with high torsion resistance Special steel grade BNK C95S drill pipe for sulfur oil wells. Mainly suitable for deep wells, horizontal wells and large displacements during oil and gas exploration and development
construction of the well.
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