Drill pipe, is hollow, thin-walled, steel or aluminium alloy piping that is used on drilling rigs. It is hollow to allow drilling fluid to be pumped down the hole through the bit and back up the annulus. It comes in a variety of sizes, strengths, and wall thicknesses, but is typically 27 to 32 feet in length (Range 2). Longer lengths, up to 45 feet, exist (Range 3).
Background
[
edit
]
Drill stems must be designed to transfer drilling torque for combined lengths that often exceed several miles down into the Earth's crust, and also must be able to resist pressure differentials between inside and outside (or vice versa), and have sufficient strength to suspend the total weight of deeper components. For deep wells this requires tempered steel tubes that are expensive, and owners spend considerable efforts to reuse them after finishing a well.
A used drill stem is inspected on site, or off location. Ultrasonic testing and modified instruments similar to the spherometer are used at inspection sites to identify defects from metal fatigue, in order to preclude fracture of the drill stem during future wellboring. Drill pipe is most often considered premium class, which is 80% remaining body wall (RBW). After inspection determines that the RBW is below 80%, the pipe is considered to be Class 2 or "yellow band" pipe. Eventually the drill pipe will be graded as scrap and marked with a red band.
Drill pipe is a portion of the overall drill string. The drill string consists of both drill pipe and the bottom hole assembly (BHA), which is the tubular portion closest to the bit. The BHA will be made of thicker walled heavy weight drill pipe (HWDP) and drill collars, which have a larger outside diameter and provide weight to the drill bit and stiffness to the drilling assembly. Other BHA components can include a mud motor, measurement while drilling (MWD) apparatus, stabilizers, and various specialty downhole tools. The drill stem includes the entire drill string, plus the kelly that imparts rotation and torque to the drill pipe at the top.
See Drilling rig (petroleum) for a diagram of a drilling rig.
Manufacturing Process
[
edit
]
Modern drill pipe is made from the welding of at least three separate pieces: box tool joint, pin tool joint, and the tube. The green tubes are received by the drill pipe manufacturer from the steel mill. The ends of the tubes are then upset to increase the cross-sectional area of the ends. The tube end may be externally upset (EU), internally upset (IU), or internally and externally upset (IEU). Standard max upset dimensions are specified in API 5DP, but the exact dimensions of the upset are proprietary to the manufacturer. After upsetting, the tube then goes through a heat treating process. Drill pipe steel is commonly quenched and tempered to achieve high yield strengths (135 ksi is a common tube yield strength).
The tool joints (connectors) are also received by the manufacturer as green tubes. After a quench and temper heat treat, the tool joints are cut into box (female) and pin (male) threads. Tool joints are commonly 120 ksi Specified Minimum Yield Strength (SMYS), rather than the 135 ksi of the tube. They generally are stiffer than the tube, increasing the likelihood of fatigue failure at the junction. The lower SMYS on the connection increases the fatigue resistance. Higher strength steels are typically harder and more brittle, making them more susceptible to cracking and subsequent stress crack propagation.
Tubes and tool joints are welded using rotary inertia or direct drive friction welding. The tube is held stationary while the tool joint is revolved at high RPMs. The tool joint is then firmly pressed onto the upset end of the tube while the tool joint is rotating. The heat and force during this interaction weld the two together. Once the "ram horns" or excess material is removed, the weld line can only be seen under a microscope. Inertia friction welding is the traditional proven method. Direct drive friction welding is controlled and monitored up to 1,000 times a second, resulting in a fine quality weld that does not necessarily need a full heat treat quench and temper regime.
References
If you want to learn more, please visit our website tongshun.
[
edit
]
Anderson, Robert O. (1984). Fundamentals of the Petroleum Industry. Norman, Oklahoma: University of Oklahoma Press. ISBN 0-585-19475-0. Recommended Practice for Drill Stem Design and Operating Limits. Norman, Oklahoma: American Petroleum Institute. 1998.
Oil casing pipes and drill pipes are an integral component of the oil and gas industry. Oil casing pipes are made of steel and used to support the walls of the oil and gas wells. Drill pipes on the other hand can be made of steel or aluminum. These pipes are hollow and used on drilling rigs.
According to oil pipe suppliers, the differences between oil casing pipes and drill pipes can be analyzed over three points.
Casings are the metal pipes on the periphery of the well, installed to keep the walls from caving in. In addition to stabilizing the well against particularly heavy loads, it also protects the groundwater from contamination by mud and fracking fluid.
Drilling pipes are connected to the drill bit. The pipes are turned to channel rotating motion in the drill bit to cut the soil and rock until the deposits can be accessed. Drilling is always the first step of every wellbore. Drilling through mud cools the heat accumulated on the drill bit from cutting rock, it also carries the rock cuttings back to the surface.
The American Petroleum Institute (API) offers standards for threads and connections. There are ample options of connection types for drilling pipes but casing pipes only have a limited few threads to choose from.
The API standards for a drill pipe require a combination of specification 5D. API 5D specification covers Grade 1 and Grade 3 pipes with greater wall thickness.
For casing pipes, the API has set a standard for APT 5CT. Industrial pipe suppliers ensure that these pipes have sufficient strength.
The first step to casing an oil well is laying the smallest section of the pipe into the ground. A guide shoe (cylindrical with a round end) is fitted on the first segment to guide it through the soil. As the first segment is guided lower and lower in the well, casing elevators link the next segment by attaching a casing collar. The casing is held in proper alignment and tongs are taken to the screws to fasten the joint below it is pushed into the ground.
When installing drilling pipes, an auger unit or diesel hammer is used to accommodate the conductor casing. The conductor casing is set through the topsoil and loose rocks, this ensures that the debris doesn’t enter the well during drilling.
Once the well site is prepared, the drill pipe and rig are brought out.
International Pipes has made quite the name as an oil piper supplier in the midwest and the rest of America. We are headquartered in Oklahoma, currently operating out of a 35-acre, full-service facility. Our staff and yard crew put in the best effort to make sure that orders are processed without errors. Our customers have also made a point to mention how fond they are of our customer service team, handling inquiries and transitions with utmost efficiency. To know more about our products and services, please visit our website.
The company is the world’s best Oil Drill Pipe supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.