round drill collar
There are different kinds of drill collars,including round drill collar,spiral drill collar,non-magnetic drill collar,square drill collar and so on.Ordinary
drill collar is the circular cross section, the center has a water
hole,the wall thickness is larger,the nozzle is smaller, the weight
of per unit length is greater than the size of drill pipe almost 4-
5 times .The majority of drill collar is thread processing directly
on the pipe body , but some of them also use the replaced joint.
(1)Eccentric-weight drill collar is an effective anti-deviation
drilling tool,with high drill pressure used in oblique
areas,rectifying oblique as well.
(2)When drilling directional wells eccentric-weight drill collar is
an effective tool to reduce oblique or straighten the well hole
using high drilling pressure.
(3)Eccentric-weight drill collar has the advantages of simple
structure,convenient use,connected directly to common drill collar
without centralizers,greatly convenient for sinking in,fishing and
(4)Eccentric-weight drill collar runs downhole safely,danger of
leakage or bit freezing hard to appear.
(5)Pay much attention to avoid mud balling and prevent effect of
|Drill Collar Specification|
|Thread Type||O.D.||I.D.||Length||Diameter of shoulder guide Angle||Reference bending strength ratio|
|Note: 1.Drill collar thread type: NC-Digital IF-Internal flat type
|2.Bending strength ratio: the ratio of the modulus of the cross
section and the modulus of the cross section of the cross section
of the dangerous section of the inner thread|
|In addition, our company can produce the drill collar and spiral
drill collar, which can also produce the special specifications of
the drill collar and the high efficiency and wear-resisting
lengthening drill collar|