Types of drill pipes
The company Electrocentury-steel offers to purchase in a wide range of grades and sections of steel drill pipe. Are economically advantageous prices from manufacturers. The supplier ensures prompt delivery of products at any t point, specified by the user.
General principles of classification of drill pipe
The drill pipe is in the type of the connection is divided into the following types:
Pipe with external upset tubing, which can be equipped with couplings or a conical stabilizing belts;
Pipes with upset ends, are also divided into pipe with couplings or conical stabilizing belts.
Pipes with welded connecting ends.
Manufacturer of drill pipes made from various grades of steel or light metal alloys, which is one of the criteria of classification.
Steel drill pipe can be manufactured of steel grades D, K, E, L, M, R, and So as the varieties of this group of equipment allocated to standard and heavy-weight drill pipe. The last type is used to increase weight and increase rigidity of the drill string and also has two versions.
UBT types include hot rolled and balanced products. First used to operate the hydraulic downhole motors, because in this case, the pipe feel less stress. The reason is that in the process of drilling with the use of downhole hydraulic motors, the pipe string is not rotating. Therefore, bending and reactive moments are small and do not reach critical values. Hot rolled drill trubitskaya smaller measure of strength, suggesting a greater tolerance of curvature of raznoshennoy and ovality.
Drill pipes are also made of duralumin — aluminium alloy (its percentage content in the alloy is 93%), copper (approximately 5% of the total amount of substance) and manganese (sometimes in the alloy also contains minor amounts of iron and magnesium).
Bescennogo for coring and drilling used universal, heavy steel and dural drill pipe, for drilling with hydraulic core — dual drill pipe with the outer pipe of steel or aluminum.
Buy at an economical price manufacturer of drill pipes in various designs the company offers Electrocentury-steel. The supplier ensures prompt delivery of products to the address specified by the consumer.
Mechanical properties of materials of drill pipes
The standard provides the following requirements for the materials used to make drill pipe. The main material is steel 36G2S, chemical composition of which is given below:
carbon… 0,32 — 0,40;
silicon… 0,4 — 0,7;
chrome… not more than 0.3;
Nickel… not more than 0.4;
sulfur… not more than 0,045;
phosphorus… not more than 0,040.
Permitted by agreement with the customer pipe hardening species and TIES made of steel 45.
Mechanical properties of pipe body of steel 36G2S and welded joints shall be as specified in the table below :
|The name of the mechanical properties||Standards for types of hardening, not less|
|Core||The outer surface||Core||The outer surface|
|Temporary resistance, MPa (kgf/mm2)||686 (70)||862 (88)||686 (70)||-||862 (88)||-|
|Yield strength, MPa (kgf/mm2)||490 (50)||755 (77)||490 (50)||-||755 (77)||-|
|The hardness of the material:|
Welded locks should be made of steel 40KHN, mechanical properties which, after volumetric heat treatment must be below the following:
— temporary resistance, MPa (kgf/mm2) 882 (90)
— yield strength, MPa (kgf/mm2) 686 (70)
— elongation, % 15
— relative contraction, % 50
— impact strength KCU at 20 °C Nm/cm2 (kgf x m/cm2) 118 (12)
— hardness material, HRC 26
Welded locks should be subjected to chemical-thermal hardening. To ensure mean time between failures of more than 6400 h the surface of the locks further strengthen wear-resistant material.
The average time to failure of drill pipes
|Size designation pipe||The average time to failure of tubes by types of reinforcement, not less than, h|
To buy at economical price from the manufacturer of the drill pipe domestic production, the company offers Electrocentury-steel. The provider ensures timely delivery of products to any place specified by the customer.