Drilling Equipments

Oil Production Equipments

Other Service Tools

Junk Sub,Back-Off Sub,Hydraulic Junk Retriever,Fishing Magnet

Junk Sub is normally run just above the drill bit or milling tool, with a cup for catching objects too heavy to be completely circulated out of the hole. It is also run above a scraper, operators can get quicker, cleaner scraping jobs.

We provide the junk subs that are made from high quality alloy steel, heat treated and machined according to API and SY standards.

Specifications:

No.	Type	Hole Size	Max. O.D. mm	Cup I.D. mm	Sub O.D. mm	Bore dia. mm	Mandrel O.D. mm	Connection
1	LB-G-94 LB-H-94	4-1/2〞-4 5/8〞	94	84	79	19	51	2 3/8〞REG
2	LB-G-102 LB-H-102	4-5/8＂-4 7/8〞	102	92	95	32	37	2 7/8 〞REG
3	LB-G-114 LB-H-114	5 1/8＂-5 7/8〞	114	406	108	38	79	3 1/2〞REG
4	LB-G-127 LB-H-127	6〞-6 3/8〞	127	116	108	38	83	3 1/2〞REG
5	LB-G-140 LB-H-140	6 1/2＂-7 1/2＂	140	124	108	38	83	3 1/2〞REG
6	LB-G-168 LB-H-168	7 1/2＂-8 1/2＂	168	151	140	57	114	4 1/2〞REG
7	LB-G-178 LB-H-178	8 5/8＂-9 5/8＂	178	160	140	57	114	4 1/2〞REG
8	LB-G-219 LB-H-219	9 5/8＂-11 3/8＂	219	202	197	70	146	6 5/8〞REG
9	LB-G-245 LB-H-245	11 1/2＂-13〞	245	217	197	70	146	6 5/8〞REG
10	LB-G-327 LB-H-327	14 3/4〞-17 1/2〞	327	295	225	76	194	7 5/8〞REG

Back-Off Sub

The back-off sub also named back-off spear. There is usually a left hand thread for tool joint at the upper part of the body, while the expansion sleeve has right hand thread. The guide cone at the lower part can make the expansion sleeve of the sub conveniently screw the fish connection. Raising the drilling tool, the expansion sleeve can hold the fish firmly, then reversing.

Specification：

Type	O.D. mm	I.D. mm	Connection API	Thread for Fishing API	Overall Length mm
ZKD105	105	20	NC31 LH	2 7/8〞EUE	572
ZDK121	121	22	NC38 LH	3-1/2〞UP TBG	600
ZDK121	121	22	NC38 LH	NC38	630
ZKD159	159	28	NC50 LH	NC50	690
ZKD178	178	32	NC50 LH	5 1/2〞FH	680

Hydraulic Junk Retriever

The Junk Retriever is mainly used to retrieve small junk objects in well bores, cutting blades and hand tools etc, It is commonly called "Junk Catcher". Simple construction, easy operation, safe and reliable performance is its features.

Specifications:

Type	Hole Size	O.D. of Barrel mm	Max. Catch Dia. mm	Max. Swallow mm	Bore Dia. mm	Ball Dia	Mill shoe O.D. mm	Top Connection
YSD445	17 1/2〞	419	311	1140	35	45	429	7 5/8〞REG
YSD445	12 1/4〞	298	222	760	35	45	308	6 5/8〞REG
YSD445	8 1/2〞	206	156	505	35	45	213	4 1/2〞IF
YSD445	6〞	146	108	505	29	45	111	3 1/2〞IF

 Fishing Magnet

The Fishing Magnets are used to retrieve all types of small objects having magnetic attraction from bore hole bottoms .Such undrillable objects cones、bearings、slips、tong pins and milling cuttings can often be retrieved only by magnetic attraction .So that keeping the bore bottom is clean.