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Downhole Tools Rig Support Wellhead Fracturing and Cementing equipment

Subs and Joints

Landrill supply Subs and joints according to API standard Specifications to customers
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Overview


Cross-over sub


Cross-over sub plays an important role in switching and connection of drill stem in oil and gas drilling work.

There are three types for cross-over sub in structure:

Type A: OD of the top end and bottom end are in same size.

Type B: OD of the top end and bottom end are in different size

Type C: Rotation of connection Thread is left-hand thread.



Circulating sub


The circulating sub is connected between wellhead pipe string and ground circulating system. When casing is running or finished running, it is connected to make fluid circulation. 


Thread/ ModelI.D.(mm)Length(mm)
Drill pipe box connectionCasing thread
NC385 BTC57500
5 LTC
5 ST & C
NC385 1/2 BTC57580
5 1/2 LTC
5 1/2 ST & C
NC507 BTC71600
7 LTC
7 ST & C
NC509 5/8 BTC71620
9 5/8 LTC
9 5/8 ST & C
NC5010 3/4 BTC71670
10 3/4 LTC
10 3/4 ST & C
NC5013 3/8 BTC71670
13 3/8 LTC
13 3/8 ST & C



Float valve sub


Float valve sub is a bit sub in which a float valve is installed. It’s connected at upper part of drill bit, the float valve assembly in sub is near the bit connecting thread and the float valve sub also can be necessary position of drill string.


ModelSub O.D.(mm)Joint connectionValve O.D.(mm)I.D.(mm)
FFJT241241.37 5/8 REGф121ф76
FFJT228228.67 5/8 REGф121ф76
FFJT209209.66 5/8 REGф121ф76
FFJT203203.26 5/8 REGф121ф71
FFJT178177.84 1/2 IFф98ф71
FFJT165165.14 1/2 REGф88ф57
FFJT1461464 1/2 REGф88ф57
FFJT1211213 1/2 REGф61ф51
FFJT1081083 1/2 REGф61ф38




Pup joint


The pup joint is used to adjust the height of full length tubing or casing strings, it is also used to adjust the depth of downhole tools.

Specifications:

Standard: API 5CT

Size: 2 3/8", 2 7/8", 3 1/2", 4 1/2"

Grade: J55/K55/N80/L80/P110

Length: 2FT/3FT/4FT/5FT/6FT/8FT/10FT/12FT



Safety Joint:


We provide two kinds of safety joint-- AJ type safety joint and H type safety joint.


Specifications - AJ Type Safety Joint


ModelO.D.  (mm)I.D. (mm)ThreadConn
AJ-C868638NC26
AJ-C959544NC26
AJ-C10510551NC31 , 2 7/8NU , 2 7/8EUE
AJ-C12112157NC38
AJ-C15915971.4NC46 , NC50
AJ-C16516571.4NC50
AJ-C17817871.4NC50 , 5 1/2FH
AJ-C203203766 5/8REG
AJ-C228228767 5/8REG


Specifications - H Type Safety Joint


ModelO.D.  (mm)I.D. (mm)ThreadConn
HAJ898915NC26
HAJ959520NC26
HAJ10510530NC31
HAJ12112138NC38
HAJ15915950NC46 , NC50
HAJ16516550NC46 , NC50
HAJ17817857NC50 , 5 1/2FH
HAJ20320371.46 5/8 REG