Drill pipe is a tool used for geological drilling work such as oil, gas, and water wells, usually composed of multiple drill pipes. It is mainly used to transmit power and withstand heavy loads, and can connect the drill bit to the drilling rig. The length and diameter of drill rods are determined according to actual needs and can be divided into different specifications, usually made of steel material.
The function of drill rod is to enable the drill bit to drill into rocks, while transmitting the torque and impact force generated during the drilling process, so that the drill bit can effectively penetrate underground.
Transmitting torque and propulsion force
The drill pipe mainly undertakes the task of transmitting torque and thrust during the drilling process. When the drilling rig drives the drill bit to rotate and drill downwards, the drill rod transmits the torque of the drilling rig to the drill bit, enabling it to break the rock. At the same time, the drill rod also bears the thrust of the drilling rig, ensuring that the drill bit can penetrate deep into the ground for drilling.
Connect drill bit and drilling rig
Another important function of drill rods is to connect the drill bit and the drilling rig. In drilling operations, the drill rod acts as a bridge, transmitting the power of the drilling rig to the drill bit. Through the connection of drill rods, the drilling rig can control the rotation speed and drilling depth of the drill bit, thereby achieving efficient drilling operations.
Ensure the stability and safety of drilling
Drill rods also bear the responsibility of ensuring drilling stability and safety. High quality drill rods can provide good rigidity and toughness to cope with complex geological conditions that may be encountered during drilling. In addition, the design and manufacturing standards of drill rods strictly follow industry standards to ensure the safety and reliability of drilling operations.
Transporting drilling fluid
The interior of the drill pipe is hollow, which allows drilling mud to flow through the inner hole of the drill pipe to the bottom of the well, cooling the drill bit, carrying drilling cuttings, and stabilizing the wellbore.
Lifting, lowering, or rotating bottom hole device
Oil drill rods, together with drill bits, can complete the operation of lifting, lowering, or rotating bottom hole devices to meet different drilling needs.
API 5DP Drill Pipe Specifications:
|
Size OD |
Nominal |
Calculate weight |
Grade |
Thickness |
Thickened form (see Note) |
|||
|
in. |
mm |
lb/ft |
kg/m |
in. |
mm |
|||
|
2 3/8 |
60.3 |
6.65 |
6.26 |
9.32 |
E,X,G,S |
0.280 |
7.11 |
EU |
|
2 7/8 |
73.0 |
10.4 |
9.72 |
14.48 |
E,X,G,S |
0.362 |
9.19 |
EU , IU |
|
3 1/2 |
88.9 |
9.50 |
8.81 |
13.12 |
E |
0.254 |
6.45 |
EU , IU |
|
3 1/2 |
88.9 |
13.30 |
12.31 |
18.34 |
E,X,G,S |
0.368 |
9.35 |
EU , IU |
|
3 1/2 |
88.9 |
15.50 |
14.63 |
21.79 |
E |
0.449 |
11.40 |
EU , IU |
|
3 1/2 |
88.9 |
15.50 |
14.63 |
21.79 |
X,G,S |
0.449 |
11.40 |
EU , IEU |
|
4 |
101.6 |
14.00 |
12.93 |
19.26 |
E,X,G,S |
0.330 |
8.38 |
EU , IU |
|
4 1/2 |
114.3 |
13.75 |
12.24 |
18.23 |
E |
0.271 |
6.88 |
EU , IU |
|
4 1/2 |
114.3 |
16.60 |
14.98 |
22.31 |
E,X,G,S |
0.337 |
8.56 |
EU , IEU |
|
4 1/2 |
114.3 |
20.00 |
18.69 |
27.84 |
E,X,G,S |
0.430 |
10.92 |
EU , IEU |
|
5 |
127.0 |
16.25 |
14.87 |
22.15 |
X,G,S |
0.296 |
7.52 |
IU |
|
5 |
127.0 |
19.50 |
17.93 |
26.71 |
E |
0.362 |
9.19 |
IEU |
|
5 |
127.0 |
19.50 |
17.93 |
26.71 |
X,G,S |
0.362 |
9.19 |
EU , IEU |
|
5 |
127.0 |
25.60 |
24.03 |
35.79 |
E |
0.500 |
12.70 |
IEU |
|
5 |
127.0 |
25.60 |
24.03 |
35.79 |
X,G,S |
0.500 |
12.70 |
EU , IEU |
|
5 1/2 |
139.7 |
21.90 |
19.81 |
29.51 |
E,X,G,S |
0.361 |
9.17 |
IEU |
|
5 1/2 |
139.7 |
24.70 |
22.54 |
33.57 |
E,X,G,S |
0.415 |
10.54 |
IEU |
GNEE API 5DP Pipe process line
API 5DP Drill Pipe test equipments
GNEE API 5DP Drill Pipe certificate
FAQ
How are drill pipes connected?
- Threaded connection: This is one of the common connection methods. Usually, male and female threads are used to tightly connect two drill rods together by rotation.
- Hydraulic connection: Using hydraulic principles to connect drill rods together. By applying high-pressure hydraulic oil at the end of the drill rod, the connecting components are expanded and tightly embedded in the mating part of another drill rod, thereby achieving connection.
- Bayonet connection: The bayonet connection method is to set a bayonet structure at the end of the drill rod, insert the end of another drill rod into the bayonet, and fix the two together with a locking device.
- Welding connection: Weld the end of the drill rod to form a whole.
How many types of drill pipe are there?
Drill pipe is categorized into three types: kelly, drill pipe, and heavy-weight drill pipe. The connection sequence is as follows: one kelly + n drill pipes (determined by well depth) + n heavy-weight drill pipes (determined by bottom hole assembly design).
What is API classification of drill pipe?
API drill pipe classification is primarily based on material grade and service condition:
By material grade (API 5DP): Common grades include E75, X95, G105, and S135, with increasing strength, suitable for shallow to ultra-deep wells, respectively.
By service condition (API RP 7G-2): In-service drill pipes are classified into Class 1 (usable), Class 2 (restricted use), and Class 3 (scrap).
All drill pipes must comply with API 5DP manufacturing standards and pass full inspection, including thread and non-destructive testing.
