Drill Collar - Standard and Spiral

• Customization: Available
• Warranty: Technical/Sample/Quality
• Manufacturing Process: Forging
• Model NO.: 4145H MOD
• Surface Treatment: Painted
• Operation Pressure: Atmospheric Pressure
• Material: Alloy
• Transport Package: Standard
• Specification: 3 1/8" - 11"
• Trademark: SHUNFU
• Origin: China
• HS Code: 8431431000
• Production Capacity: 100000 Tons Per Year

Product Description

As an important part of drill string, drill collar can supply the drill bit and increase the rigidity of drill string. Dril collar are manufactured strictly according to API Spec7-1 standard with material of AISI 4145 Mod. We supply slick drill collars, spiral drill collars, etc. The size of drill collar we can provide is from 3.1/8 to 11 inches. We can also provide other drill collars at customers' specific request .

Drill Collars are one of the parts of a drills string. Drill for the Collars is meant to provide weight for drilling purposes. The Drill Collars are thick walled tube like pieces that are machined from solid steel bars, although they are often made from plain carbon steel or the non magnetic alloy of copper and steel or other premium alloys that are non magnetic in nature. Drill collar has bars of solid steel that are drilled from one end to the other to provide a passage for pumping the drilling fluids through the collar.

Collars that are available for drilling have an external diameter that is made of steel and can be slightly machine perfected for making sure of the roundness. Drill Collars are sometimes perfected with the help of spiral Collars or helical shaped grooves. Drill threaded collar have connections that are male or one end and female on the other and. These are cut into a multiple collar that can be adjusted with screw along with other down hole tools. Drill helps make a bottom hole assembly or BHA.

MAGNETIC DRILL COLLAR
Slick and Spiral Drill Collars
according to API Spec 7-1
NS1 and DS1 properties
4145H Material. Hot Rolled
Stress Reflief Groove
SRG on PIN
Bore Back on Box
Connections Phospatized
Cold Roll on Threads to improve
fatigue resistance
Thread Protectors
Pony Drill Collar available

Product Details
• First class equipment could guarantee the whole process flow and the clave process be more efficient like heat treating and friction welding.
• Meet the international requirement of the API 5DP, API 7G, & ISO 9001;
• Advanced and strict inspection instruments could guarantee the high quality product with a more stable performance.

Features of Drill Collar
Superior-quality green pipe&Advanced heat treatment process-High Strength& high toughness(especially under low temperature).
To meet or exceed requirements of the API 7-1,API 7G&IS09001.
Equipped with advanced inspection instruments and a strictly enforced quality controlling system,the final products are guaranteed to be of superior and stable quality.
Due to our professional technicians&product flexibility,we are capable of meeting some customer' s specific requirements.

Drill collars are extra-heavy integral tools used to concentrate weight onto the drill bit so as to produce sufficient force for the drill bit to break rock efficiently while drilling. They are made of AISI 4145H modified steel and are connected between drill pipes and drill bits.

Drill collars come in 30 or 31 foot lengths and are furnished as slick (as-rolled surface finish) or spiraled. Spiraled drill collars have grooves on its external surface which maintains an even flow of drilling fluid around the collar to equalize pressure and reduce differential-sticking of the collar to the wall of the oilwell.

Our drill collar connections comply with dimensional requirements specified in API Spec. 7/7-1 and guidelines presented in API RP7G. Drill collars also come with slip and elevator recesses for safe and efficient handling. Slip and elevator recesses can be used together or separately and are machined in compliance with API RP7G guidelines unless otherwise specified.

DRILL COLLARS SIZES

Item	OD	ID	LG	Conexin	Conexin	Recommended	Torsional Strength ft-lbs	Bending Strenght Ratio (BSR)	Weight Slick	Weight Spiral
	(IN)	(IN)	(ft)	Preffered	(Other)	Make-Up Torque ft-lbs			(kg)	(kg)
1	3 1/8	1 1/4	31	NC 23		3.3	5.86	2.57:1	306	NA
2	3 1/2	1 1/2	31	NC 26	2 3/8 IF	4.6	8.1	2.42:1	372	NA
3	4 1/8	2	31	NC 31	2 7/8 IF	6.9	12.1	2.44:1	485	458
4	4 3/4	2	31	NC 35		10.8	19.1	2.58:1	689	653
5	4 3/4	2	31	NC 38	3 1/2 IF	9.99	17.6	1.80:1	689	653
6	4 3/4	2 1/4	31	NC 38	3 1/2 IF	9.99	17.6	1.92:1	649	617
7	4 3/4	2 1/4	31	NC 35		9.2	16.2	2.82:1	649	617
8	4 3/4	2 1/2	31	NC 38	3 1/2 IF	9.99	17.6	2.10:1	608	572
9	5	2	31	NC 38	3 1/2 IF	12.9	22.7	2.24:1	752	790
10	5	2 1/4	31	NC 38	3 1/2 IF	12.9	22.7	2.38:1	739	703
11	5 1/4	2 1/4	31	NC 38	3 1/2 IF	12.9	22.7	2.88:1	835	789
12	5 3/4	2 1/4	31	NC 46	4 IF	17.7	31.2	1.68:1	1.039	993
13	5 3/4	2 1/4	31	NC 40	4 FH	17	30	3.04:1	1.039	993
14	6	2 1/4	31	NC 46	4 IF	23.4	41.2	2.02:1	1.148	1.093
15	6	2 13/16	31	NC 46	4 IF	22.4	39.5	2.24:1	1.043	984
16	6 1/4	2 1/4	31	NC 46	4 IF	28	49.3	2.38:1	1.261	1.202
17	6 1/4	2 13/16	31	NC 46	4 IF	22.4	39.5	2.64:1	1.157	1.098
18	6 1/4	2 13/16	31	NC 50	4 1/2 IF	23	40.5	1.71:1	1.157	1.098
19	6 1/2	2 1/4	31	NC 46	4 IF	28	49.3	2.77:1	1.379	1.311
20	6 1/2	2 1/4	31	NC 50	4 1/2 IF	29.7	52.2	1.89:1	1.379	1.311
21	6 1/2	2 13/16	31	NC 46	4 IF	22.4	39.5	3.07:1	1.275	1.207
22	6 1/2	2 13/16	31	NC 50	4 1/2 IF	29.7	52.2	2.03:1	1.275	1.207
23	6 3/4	2 1/4	31	NC 50	4 1/2 IF	36.7	64.7	2.21:1	1.501	1.433
24	6 3/4	2 1/2	31	NC 50	4 1/2 IF	35.8	63	2.26:1	1.456	1.388
25	6 3/4	2 1/2	31	NC 46	4 IF	35.8	63	2.26:1	1.356	1.43
26	6 3/4	2 3/4	31	NC 50	4 1/2 IF	32.3	56.8	2.37:1	1.397	1.324
27	6 3/4	2 13/16	31	NC 50	4 1/2 IF	32.3	56.8	2.37:1	1.397	1.324
28	7	2 1/4	31	NC 50	4 1/2 IF	38.4	61.4	2.54:1	1.628	1.538
29	7	2 1/2	31	NC 50	4 1/2 IF	35.8	57.3	2.61:1	1.588	1.492
30	7	2 13/16	31	NC 50	4 1/2 IF	32.3	51.6	2.73:1	1.524	1.429
31	7	2 13/16	31	5 1/2 FH		32.8	52.4	1.72:1	1.524	1.429
32	7 1/4	2 13/16	31	NC 50	4 1/2 IF	32.3	47.3	3.12:1	1.71	1.593
33	7 1/4	3	31	5 1/2 FH		41	49.6	2.05:1	1.665	1.551
34	7 3/4	2 13/16	31	6 5/8 REG		53.3	79	2.30:1	1.998	1.86
35	7 3/4	3	31	6 5/8 REG		50.7	78.5	2.35:1	1.955	1.778
36	8	2 13/16	31	6 5/8 REG		53.3	85.4	2.60:1	2.077	1.964
37	8	3	31	6 5/8 REG		50.7	81.1	2.66:1	2.037	1.923
38	8 1/4	2 13/16	31	6 5/8 REG		53.3	85.4	2.93:1	2.227	2.1
39	8 1/4	3	31	6 5/8 REG		50.7	81.1	2.99:1	2.186	2.059
40	8 1/2	2 1/4	31	6 5/8 REG		50.7	81.1	3.14:1	2.391	2.53
41	8 1/2	2 13/16	31	6 5/8 REG		53.3	85.4	3.27:1	2.381	2.25
42	8 1/2	3	31	6 5/8 REG		50.7	81.1	3.34:1	2.341	2.209
43	8 1/2	3 1/4	31	6 5/8 REG		46.9	75.1	3.46:1	2.286	2.155
44	9	2 13/16	31	7 5/8 REG		84.4	135	2.28:1	2.703	2.463
45	9	2 13/16	31	6 5/8 FH		84	134	2.41:1	2.708	2.468
46	9	3	31	7 5/8 REG		84.4	135	2.31:1	2.667	2.422
47	9	3	31	6 5/8 FH		81.1	130	2.44:1	2.667	2.422
48	9	3 1/2	31	6 5/8 FH		72.1	115	2.56:1	2.545	2.304
49	9 1/2	2 13/16	31	7 5/8 REG		91.6	147	2.78:1	3.048	2.799
50	9 1/2	3	31	7 5/8 REG		88.6	142	2.81:1	3.007	2.758
51	9 1/2	3  1/16	31	7 5/8 REG		87.5	140	2.83:1	2.994	2.744
52	9 3/4	3	31	7 5/8 REG		91.8	147	3.10:1	3.184	2.935
53	10	3	31	8 5/8 REG		109	175	1.98:1	3.366	3.084
54	11	3	31	8 5/8 REG		131	209	2.84:1	4.166	3.815