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Drilling Stabilizers

We offer a wide variety of near bit stabilizers and string stabilizers according to API Spec.7 from China. All drilling stabilizers can be highly customized according to customer's requirements. This includes different sizes, shapes as well as several types of hardfacing. Please inquire.

Drill Stabilizer Overview

Integral Blade Drill Stabilizers (3 different types)
Replaceable Sleeve Drill Stabilizer (3 different types)
Non-Rotating Drill Stabilizer
Float Valve Drill Stabilizer
Variable Diameter Drill Stabilizer
Unbalanced Spiral Blade Drill Stabilizer (2 different types)
Spherical Drill Stabilizer

Integral Spiral Blade Drill Stabilizer - Type 1

(⇑Overview)

Drill Stabilizer

Bit size (in)	Stabilizer Working OD	End OD of body	ID	Stabilizer Length	Thread code on ends
					String type			Near bit type
					Top	Down		Top		Down
6	152.2	121	51	1200	NC38		NC38		NC38	3 1/2"REG
6 1/4	158.7	121	51	1200	NC38		NC38		NC38	3 1/2"REG
6 1/2	165.1	121	51	1200	NC38		NC38		NC38	3 1/2"REG
7 1/2	190.5	159	57	1600	NC46		NC46		NC46	4 1/2"REG
7 7/8	200	159	57	1600	NC46		NC46		NC46	4 1/2"REG
8 3/8	212.7	159 65	71	1600 1800	NC46 NC50					4 1/2"REG
8 1/2	215.2	159 165 178	71	1600 1800	NC46 NC50					4 1/2"REG
8 3/4	222.2	159 165 178	71	1600 1800	NC46 NC50					4 1/2"REG
9 1/2	241.3	178 197	71	1600	NC50	NC50		NC50		6 5/8" REG
9 5/8	244.5	178 197	71	1800	NC50	NC50		NC50		6 5/8" REG
9 7/8	250.8	178 197	71	1800	NC50	NC50		NC50		6 5/8" REG
12 1/4	311.2	203 229	76	1800	NC56 3 1/2" REG	NC56 6 1/2"REG		NC56 6 5/8" REG		6 5/8" REG
17 1/2	444.5	229 241.3	76	2000 2200	NC61 7 5/8" REG	NC61 7 5/8"REG		NC61 7 5/8" REG		NC61 7 5/8" REG
24	609.6	229 241.3	76	2000 2200	NC61 7 5/8" REG	NC61 7 5/8"REG		NC61 7 5/8" REG		NC61 7 5/8" REG
26	660.4	229 241.3	76	2000 2200	NC61 7 5/8" REG	NC61 7 5/8"REG		NC61 7 5/8" REG		NC61 7 5/8" REG
28	711.2	229 241.3	76	2000 2200	NC61 7 5/8" REG	NC61 7 5/8"REG		NC61 7 5/8" REG		NC61 7 5/8" REG

Spiral Blade Drill Stabilizer - Type 2

Stabilizer 2

Bit size (in)	Stabilizer Working OD	End OD of body	ID	Stabilizer Length	Thread code on ends
					String type		Near bit type
					Top	Down	Top end	Down end
6	152.2	121	51	1200	NC38	NC38	NC38	3 1/2"REG
6 1/4	158.7	121	51	1200	NC38	NC38	NC38	3 1/2"REG
6 1/2	165.1	121	51	1200	NC38	NC38	NC38	3 1/2"REG
7 1/2	190.5	159	57	1600	NC46	NC46	NC46	4 1/2 REG
7 7/8	200	159	57	1600	NC46	NC46	NC46	4 1/2 REG
8 3/8	212.7	159 165	71	1600 1800	NC46 NC50			4 1/2 REG
8 1/2	215.2	159 165 178	71	1600 1800	NC46 NC50			4 1/2 REG
8 3/4	222.2	159 165 178	71	1600 1800	NC46 NC50			4 1/2 REG
9 1/2	241.3	178 197	71	1600	NC50	NC50	NC50	6 5/8 REG
9 5/8	244.5	178 197	71	1800	NC50	NC50	NC50	6 5/8 REG
9 7/8	250.8	178 197	71	1800	NC50	NC50	NC50	6 5/8 REG
12 1/4	311.2	203 229	76	1800	NC56 3 1/2 REG	NC56 6 1/2 REG	NC56 3 1/2 REG	6 5/8 REG
17 1/2	444.5	229 241.3	76	2000 2200	NC61 7 5/8 REG	NC61 7 5/8 REG	NC61 7 5/8 REG	NC61 7 5/8 REG
24	711.2	229 241.3	76	2000 2200	NC61 7 5/8 REG	NC61 7 5/8 REG	NC61 7 5/8 REG	NC61 7 5/8 REG
26	660.4	229 241.3	76	2000 2200	NC61 7 5/8 REG	NC61 7 5/8 REG	NC61 7 5/8 REG	NC61 7 5/8 REG
28	711.2	229 241.3	76	2000 2200	NC61 7 5/8 REG	NC61 7 5/8 REG	NC61 7 5/8 REG	NC61 7 5/8 REG

Integral Straight Blade Drill Stabilizer - WZ Type

Stabilizer 3

Bit O.D. (in)	Working O.D.	D2	d	L2	Stabilizer Length (mm)				Thread code on ends
					Short Type		Long Type		Drill string type		Near bit type (in)
					Near bit type	Drill string type	Near bit type	Drill string type	End	Down	Top	Down
6	152.4	121	51	400~ 500	800~ 900	1000~ 1100	1200~ 1400	1400~ 1600	NC38	NC38	NC38	3 1/2 REG
6 1/4	158.7	121	51	400~ 500	800~ 900	1000~ 1100	1200~ 1400	1400~ 1600	NC38	NC38	NC38	3 1/2 REG
6 1/2	165.1	121	51	400~ 500	800~ 900	1000~ 1100	1200~ 1400	1400~ 1600	NC38	NC38	NC38	3 1/2 REG
7 1/2	190.5	159, 165, 178	57	400~ 500	800~ 900	1000	1600	1800	NC46	NC46	NC46	4 1/2 REG
7 7/8	200.0	159, 165, 178	57	400~ 500	800~ 900	1000	1600	1800	NC46	NC46	NC46	4 1/2 REG
8 3/8	12.7	159, 165, 178	57	400, 500, 600	800~ 900	1000~ 1200	1600~ 1800	1800~ 2000	NC46 NC50			4 1/2 REG
8 1/2	15.9	159, 165, 178	57	400, 500, 600	800~ 900	1000~ 1200	1600~ 1800	1800~ 2000	NC46 NC50			4 1/2 REG
8 3/4	22.2	159, 165, 178	57	400, 500, 600	800~ 900	1000~ 1200	1600~ 1800	1800~ 2000	NC46 NC50			4 1/2 REG
9 1/2	241.3	178, 197	71	400~ 600	800~ 1000	1000~ 1200	1600~ 1800	1800~ 2000	NC50	NC50	NC50	6 5/8 REG
9 5/8	244.5	178, 197	71	400~ 600	800~ 1000	1000~ 1200	1600~ 1800	1800~ 2000	NC50	NC50	NC50	6 5/8 REG
9 7/8	250.8	178, 197	71	400~ 600	800~ 1000	1000~ 1200	1600~ 1800	1800~ 2000	NC50	NC50	NC50	6 5/8 REG
12 1/4	311.2	203, 229	76	500~ 600	1000~ 1200	1200 1500	1800 2000	1800~ 2000	NC56 6 5/8 REG			6 5/8 REG
17 1/2	444.5	203, 229	76	500~ 600	1200~ 1300	1200~ 1300	2000~ 2200	2000~ 2200	NC61 7 5/8 REG

Replaceable Sleeve Drilling Stabilizer (2 Sleeves)

(⇑Overview)

Stabilizer 4

Upset end length = 200 mm, fishing neck length = 600 mm

Bit Dia. (in)	Drill collar dia.	Stabilizer sleeve		Stabilizer body				Thread code on ends (in)
		Length	Work OD	Upset end Dia.	ID	Make-up Torque (KNm)	Overall length (mm)	Drill string type		Near bit type
		Length	Work OD	Upset end Dia.	ID	Make-up Torque (KNm)	Overall length (mm)	Top	Down	Top	Down
8 1/2	6 1/2	480	214	190	71	6.95 - 7.25	1900	4 1/2IF	4 1/2 IF	4 1/2 IF	4 1/2 IF
8 1/4	6 1/2	470	210	190	71	6.95 - 7.25	1900	4 1/2IF	4 1/2 IF	4 1/2 IF	4 1/2 IF
8	6 1/2	472	203	190	71	6.95 - 7.25	1900	4 1/2IF	4 1/2 IF	4 1/2 IF	4 1/2 IF
7 3/4	6 1/2	455	197	190	71	6.95 - 7.25	1900	4 1/2IF	4 1/2 IF	4 1/2 IF	4 1/2 IF
12 1/4	8	555	310	238	76	19.7- 11	2000	6 5/8 REG	6 5/8 REG	6 5/8 REG	6 5/8 REG
12	8	550	305	238	76	19.7- 11	2000	6 5/8 REG	6 5/8 REG	6 5/8 REG	6 5/8 REG
11 1/2	8	540	292	238	76	19.7- 11	2000	6 5/8 REG	6 5/8 REG	6 5/8 REG	6 5/8 REG
11	8	530	279	238	76	19.7- 11	2000	6 5/8 REG	6 5/8 REG	6 5/8 REG	6 5/8 REG
17 1/2	9	682	444	279	76	13.8/5- 16.55	2000	7 5/8 REG	7 5/8 REG	7 5/8 REG	7 5/8 REG
17	9	676	432	279	76	13.8/5- 16.55	2000	7 5/8 REG	7 5/8 REG	7 5/8 REG	7 5/8 REG
16 1/2	9	670	420	279	76	13.8/5- 16.55	2000	7 5/8 REG	7 5/8 REG	7 5/8 REG	7 5/8 REG
16	9	664	407	279	76	13.8/5- 16.55	2000	7 5/8 REG	7 5/8 REG	7 5/8 REG	7 5/8 REG

Replaceable Sleeve Drilling Stabilizer (3 Sleeves)

Drilling Stabilizer

Stabilizer Working OD	L2	D2	d	L1	L	Bit Dia.
mm						mm (in)
190.5 (190.0, 189.0)	400 500	159	57	850	1800	190.5 (7 1/2)
200.0 (199.0, 198.0)	400 500	159	57	850	1800	200.0 (7 7/8)
212.7 (212.0, 211.0)	400 500 600	159 178	57 71	850	1800	212.7 (8 3/8)
215.9 (215.0, 220.0)	400 500 600	159 178	57 71	850	1800	215.9 (8 1/2)
222.2 (22.0, 220.0)	400 500 600	159 178	57 71	850	1800	222.2 (8 3/4)
241.3 (240.0, 239.0)	400 500 600	178	71	850	1800 2000 2100	241.3 (9 1/2)
244.5 (244.0, 243.0)	400 500 600	178	71	850	1800 2000 2100	244.5 (9 5/8)
250.8 (250.0, 249.0)	400 500 600	178	71	850	1800 2000 2100	250.8 (9 7/8)
311.2 (310.0, 309.0)	500 600	203 228	76	850	1800 2000 2200	311.2 (12 1/4)
311.2 (310.0, 309.0)	500 600	203 228	76	850	1800 2000 2200	444.5 (17 1/2)
444.5 (443.0, 442.0)	500 600	203 228	76	850	1800 2000 2200	444.5 (17 1/2)

Non-Rotating Drill Stabilizer

(⇑Overview)

Drilling Stabilizer

Hole size (in)	Stabilizer Sleeve			Stabilizer Body			Overall Length (mm)
Hole size (in)	Length (mm)	OD	Blade Qty.	ID (mm)	Fishing OD	Thread type	Overall Length (mm)
13 3/8	500	313	4	71	165	4 1/2" IF	2000
10 3/4	500	255	4	71	165	4 1/2" IF	2000
9 5/8	500	220	4	71	165	4 1/2" IF	2000
7	380	157	4	44	127	4 1/2" IF	1600
12 1/4	523	310	4	76	215	6 1/8" REG	2010
16	543	405	4	76	241	7 5/8" REG	2210
17	543	430	4	76	241	7 5/8" REG	2210
22	635	558	4	76	241	7 5/8" REG	2210
28	715	711	5	76	241	7 5/8" REG	2210

Float Valve Drilling Stabilizer

(⇑Overview)

Drill Stabilizer

Stabilizer Body O.D. (mm)	Stabilizer thread	Float valve O.D.(mm)	Float valve I.D.(mm)
228	7 5/8" REG	121	76
228	7 5/8" REG	121	76
228	7 5/8" REG	121	76
203	6 5/8" REG	121	76
178	4 1/2" IF	98	71
178	4 1/2" REG	88	71
127	3 1/2" REG	61	51

Variable Diameter Drilling Stabilizer

(⇑Overview)

Drill Stabilizer

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

Mechanical Properties

Stabilizer Type	Min. pressure on stretching out of support head (Mpa)	Radial force on main support heads (10 Mpa differential pressure) (KN)	Max. allowed working pressure (Mpa)	Max. differential pressure (Mpa)
3/4"	0.1	513	20	40
1/2"	0.1	513	20	40

Unbalanced Spiral Blade Drill Stabilizer (Single Blade)

(⇑Overview)

Stabilizer 9

Stabilizer OD	Stabilizer ID	Thread conn.(in)	Length (mm)
215	71	4 1/2 IF	1800
311	76	6 5/8 REG	1800
444	76	7 5/8 REG	2000

Unbalanced Spiral Blade Drill Bit Stabilizer (Multi-Blade)

Stabilizer OD	Stabilizer ID	Thread conn.	Length (mm)
215	71	4 1/2 IF	4600
311	76	6 5/8 REG	4600

Spherical Drill Stabilizer

(⇑Overview)

Drilling Stabilizer

Stabilizer Working OD (in)	Body OD on both ends (mm)	Stabilizer ID (mm)	Stabilizer Length (mm)	Thread on ends (in)
				String type		Near bit type
				Top	Down	Top	Down
6 ~6 1/2	121	51	785	3 1/2 IF	3 1/2 IF	3 1/2 IF	3 1/2 REG
7~ 7 7/8	159	57	850	4 1/2 IF	4 1/2 IF	4 1/2 IF	4 1/2 REG
8 ~8 1/2	165	71	850	4 1/2 IF	4 1/2 IF	4 1/2 IF	4 1/2 REG
9 ~9 1/4	197	71	870	4 1/2 IF	6 5/8 REG	4 1/2 IF	4 1/2 REG
12~12 1/4	203	76	940	6 5/8 REG	6 5/8 REG	6 5/8 REG	6 5/8 REG