Drill Collars/ Drilling String/ Kelly Bar

Product Description

Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity.
Guizhou viton industrial Co., Ltd located in the city of guiyang, west China, provided with a research & development technology center, modern production facilities of forging, heat treatment, surface treatment, precise machine processing, deep hole processing, etc., advanced techniques of measurement analysis and detection for materials, as well as a complete product line for oil drilling tools and facilities. The company owns comprehensive, systemic and scientific management system and quality guarantee system.

Drill Collar Number O.D. I.D. Length Bevel Diameter Ref bend g Strength ratio
(mm) (in) (mm) (in) (mm)
NC****1 *9.4 3 1/8 *1.8 1 1/2 ***0 *6.2 2.*7:1
NC****5(2 3/8 IF) *8.9 3 1/2 *8.1 1 1/2 ***0 *2.9 2.*2:1
NC****1(2 7/8 IF) **4.8 4 1/8 *0.8 2 ***0 **0.4 2.*3:1
NC****7 **0.6 4 3/4 *0.8 2 ***0 **4.7 2.*8:1
NC****0(3 1/2 IF) **7.0 5 *7.2 2 1/4 ***0 **1.0 2.*8:1
NC****0 **2.4 6 *7.2 2 1/4 ***0 & ***0 **4.5 2.*9:1
NC****0 **2.4 6 *1.4 2 *3/*6 ***0 & ***0 **4.5 2.*4:1
NC****2 **8.8 6 1/4 *7.2 2 1/4 ***0 & ***0 **9.2 2.*1:1
NC****2(4IF) **8.8 6 1/4 *1.4 2 *3/*6 ***0 & ***0 **0.0 2.*3:1
NC****5(4IF) **5.1 6 1/2 *7.2 2 1/4 ***0 & ***0 **4.8 2.*6:1
NC****5(4IF) **5.1 6 1/2 *1.4 2 *3/*6 ***0 & ***0 **4.8 3.*5:1
NC****7(4IF) **1.4 6 3/4 *7.2 2 1/4 ***0 & ***0 **9.5 3.*8:1
NC****7(4 1/2 IF) **1.4 6 3/4 *1.4 2 *3/*6 ***0 & ***0 **9.5 2.*7:1
NC****0(4 1/2 IF) **7.8 7 *7.2 2 1/4 ***0 & ***0 **4.7 2.*4:1
NC****0(4 1/2 IF) **7.8 7 *1.4 2 *3/*6 ***0 & ***0 **4.7 2.*3:1
NC****2(4 1/2 IF) **4.2 7 1/4 *1.4 2 *3/*6 ***0 & ***0 **9.5 3.*2:1
NC****7 **6.8 7 3/4 *1.4 2 *3/*6 ***0 & ***0 **5.3 2.*0:1
NC****0 **3.2 8 *1.4 2 *3/*6 ***0 & ***0 **0.1 3.*2:1
6 5/8 REG **9.6 8 1/4 *1.4 2 *3/*6 ***0 & ***0 **5.7 2.*3:1
NC****0 **8.6 9 *1.4 2 *3/*6 ***0 & ***0 **2.6 3.*7:1
7 5/8 REG **1.3 9 1/2 *6.2 3 ***0 & ***0 **3.8 2.*1:1
NC****7 **7.6 9 3/4 *6.2 3 ***0 & ***0 **2.8 2.*7:1
NC*****0 **4 *0 *6.2 3 ***0 & ***0 **7.3 2.*1:1
8 5/8 REG **9.4 *1 *6.2 3 ***0 & ***0 **6.7 2.*4:1

Share