drilling crossover sub for oil drilling

  Drill Stem Crossover Sub, Rotary Sub    Drill stem crossover sub is used to join different size or type of drill stem connections. The drill stem crossover sub conforms to API spec 7. We can provide all sizes of crossover subs for drill collars, drill pipes, kellys and swivels according to customer’s requirements. Besides, the crossover sub blanks are available. The crossover subs made of super alloy steel through forging and heat treatment provide high strength, good ductility and long service life. The thread surface is coated with copper or phosphate to provide excellent thread sticking resistance.   Drill stem crossover sub is divided into drill string crossover sub and tubing crossover sub. Drill string Cross-over sub is divided into type A, type B and type C:   Type A: One crossover has one same OD   Type B: One crossover has two sizes OD.   Type C: The connection type is left hand type.  

Drill-stem   Crossover Sub Available Models
Description	Upper   junction block	Lower   junction block	Type
Kelly sub	Kelly	Drill pipe sub	Type   A or B
Drill pipe sub	Drill pipe	Drill pipe sub	Type   A or B
Crossover sub	Drill pipe	Drill collar	Type   A or B
Drill collar sub	Drill collar	Drill collar	Type   A or B
Bit sub	Drill collar	Drill Bit	Type   A or B
Swivel sub	Swivel lower sub	Kelly	Type   C
Fish sub	Kelly	Drill pipe sub	Type   C
	Drill pipe	Fishing tool	Type   C

  Mechanical Properties:   

O.D.   Range	Min Yield   Strength	Min Tensile   Strength	Min Elongation	Brinell Hardness	Charpy Impact   Value
in	0.2Mpa	Mpa	4%	HB	AKVJ
3 1/8 - 6 3/4	≥758	≥965	≥13	285-341	≥54
7 - 11	≥689	≥930

    Related products-- tool joint   Our Services   We do everything to enable the clients to get more benefits and to seek more business opportunities in the market. We promise to create more values for you and the society.
We must develop new technologies and new products for our clients, and make our popularity on a high level in this field; we must heighten our position and set a good example in the field. A group of experienced staff are ready to serve you with enthusiasm at any moment!   After-Sales Service:
Provide considerate services to minimize clients' worries.
(1) Assist clients to prepare for the first construction scheme;
(2) Install and debug the equipment;
(3) Train the first-line operators on site
(4) Examine the equipment regularly;
(5) Take initiative to eliminate the troubles rapidly at site;
(6) Distribute the guarantee fittings door-to-door
(7) Provide perfect service;
(8) Provide technical exchanging;
(9) Provide maintenance for big items.   Company Information  
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4.  A talent and experienced team.   Please do not hesitate to inform us your requirement or any special idea. . we work hard for both of our success.   FAQ     1.Now are you still hesitate to send the inquiry to us? No,just send your inquiry to us,please rest  we will try to provide you good quality at best quotation. 2.Now are you worry about  our quanlity? Our goods have exported to Azerbajia, Russia, America,Dubai ,Kuwait and many countries. we will welcome you visit our factory any time  

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