API 7-1 drilling stabilizer centralizer for drill pipe

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Standard and Certification: API
Condition: New
Packing:export packing

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 not solves. During drilling in directional well, by use of differential pressure at nozzle produced by circulation of fluid among inside and outside of drill string, stabilizer stretch out supporting head to reach full hole so that stabilizer equipped with different drill tools to increase or angle drop or stabilize hole inclination. Meanwhile, when stop pump circulation, support head draws back so that stabilizer OD becomes small to improve tripping out smoothly.

Properties index

Type Min. pressure when Radial force of main support Max. working Max.
support head stretch heads under 10Mpa differential allowed pressure differential
out(Mpa) pressure (KN) (Mpa) pressure
ZBW8 3/4″ 0.1 513 20 40
ZBW8 1/2″ 0.1 513 20 40



Type Body ID Support head assembly OD (mm) Support head Overal- Box Pin OD
OD (mm) Nos. Length thread thread varied
(mm)     (mm)      
ZBW8 3/4″ 201 55 80 15 1350 NC50 NC50 211~213
ZBW8 1/2″ 204 55 80 15 1350 NC50 NC46 214~215


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