Specifications

1. API 7-1 Spec
2. 8 3/4"~8 1/2"
3. Variable diameter stabilizer solves the problem which common stabilizer can't solve

Variable Diameter stabilizer is one of main drill tool assembly in hole guiding. During drilling in deviating and horizontal well, in view of workmanship, stabilizer OD is required to be equal or 1~2mm less than drill bit so that too small clearance between borehole wall and stabilizer usually causes stabilizer to be easily stuck during tripping out of hole.

  However, variable diameter stabilizer solves the problem which common stabilizer can't solve. During drilling in directional well, by use of differential pressure at nozzle produced by circulation of fluid among inside and outside of drilling string, stabilizer stretch out supporting head to reach full hole so that stabilizer equipped with different drill tools to increase or angle drop or stabilizer hole inclination. Meanwhile, when stop pump circulation, support head draw back so that stabilizer OD becomes small to improve tripping out smoothly.

Detail Specification:

Technical specifications and parameters for Variable Diameter stabilizer
Type	Body OD(mm)	I.D.(mm)	Support head assembly O.D.(mm)	Support head Nos.	Overall length(mm)	Box thread	Pin thread	O.D. varied
ZBW 8 3/4"	201	55	80	15	1350	NC50	NC50	211~213
ZBW 8 1/2"	204	55	80	15	1350	NC50	NC46	214~216

 

 

Technical specifications and parameters for Variable Diameter stabilizer
Type	Min. pressure when support head stretch out (Mpa)	Radial force of main support heads under 10Mpa differential pressure(KN)	Max. working allowed pressure (Mpa)	Max. differential pressure
ZBW 8 3/4"	0.1	513	20	40
ZBW 8 1/2"	0.1	513	20	40