Oriented Bent Sub

Product Detail

Oriented Bent Sub

Technical Features

The oriented sub is a major power deflection tool having a fixed angle (a) deviated from low end thread of the bent sub to axial line of drill stem, the power drill tool under the application of oriented sub give the bit a constant lateral force to ensure that the bit can cut on the well wall laterally and further drill into a curved well trace.

Operation method

● After the bit and oriented sub are connected and screwed, detecting of the angle between the big water hole of bit and oriented key of oriented sub shall be done;

● After run in drill tool, calculate out the azimuth of big water hole of bit according to the azimuth of oriented key determined at a single point by drift indicator;

● Change the big water hole of bit into required azimuth, then lock in rotary and start pump drilling to cut in;

● During deflecting, taking a way that deflect while lightly pressing and crowning of drill to help deflection;

● After deflected for 2 to 3 meters, drill in 4 to 5 meters with lightly pressure and rotating slowly;

● Repeat above operation for several times, when the angle of deviation is up to the expected requirement deflecting in can be done smoothly by reducing of drill pressure and increasing of rotating speed.

Technical Parameter

Model	Product Code	O.D.mm(in)	Connection		Bent angle a(degree)	I.D. of oriented sleeve (mm)
			Box	Pin
DZT89	J0802010	89(3 1/2)	NC26	NC26	2°	36
DZT105	J0804010	105(4 1/8)	NC31	NC31	2°	36
DZT127	J0807010	127(5)	NC38	NC38	2°	36
DZT159	J0808010	159(6 1/4)	NC46	NC46	2°	50
DZT165	J0809010	165(6 1/2)	NC50	NC50	2°	50
DZT178	J0812010	178(7)	5 1/2FH	5 1/2FH	2°	50
DZT203	J0814010	203(8)	6 5/8REG	6 5/8REG	2°	50