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We supply slick drill collars, spiral drill collars and non-magnetic drill collars; their sizes are from 3-1/8 to 11 inches. Besides the drill collars in the table below, we can supply other drill collars at customers' request. A drill collar is a device used in the drilling of oil wells for weighting the drill bit, enabling it to drill through rock. It is a bar made of solid steel, either plain carbon steel or a non-magnetic steel alloy, drilled lengthwise to permit the passage of drilling fluids. A drill collar forms the lowest element of a drill string, which encompasses all the elements of a down-hole process from the surface to the rock bit. Drill Collars Drill Collor Number Outside Diameter, in. Inside Diameter, in. Length, ft Approximate Weight, lb/ft Typical Bending Strength Ratio NC 23-31 3-1/8 1-1/4 30 22 2.57:1 NC 26-35 (2-3/8 IF) 3-1/2 1-1/2 30 27 2.42:1 NC 31-41 (2-7/8 IF) 4-1/8 2 30 or 31 34 2.43:1 NC 35-47 4-3 /4 2 30 or 31 47 2.58:1 NC 38-50 (3-1/2 IF) 5 2-1/4 30 or 31 54 2.38:1 NC 44-60 6 2-1/4 30 or 31 83 2.49:1 NC 44-60 6 2-13 /16 30 or 31 76 2.84:1 NC 44-62 6-1/4 2-1/4 30 or 31 91 2.91:1 NC 46-62 (4 IF) 6-1/4 2-13 /16 30 or 31 84 2.63:1 NC 46-65 (4 IF) 6-1/2 2-1/4 30 or 31 100 2.76:1 NC 46-65 (4 IF) 6-1/2 2-13 /16 30 or 31 93 3.05:1 NC 46-67 (4 IF) 6-3 /4 2-1/4 30 or 31 109 3.18:1 NC 50-70 (4-1/2 IF) 7 2-1/4 30 or 31 118 2.54:1 NC 50-70 (4-1/2 IF) 7 2-13 /16 30 or 31 111 2.73:1 NC 50-72 (4-1/2 IF) 7-1/4 2-13 /16 30 or 31 120 3.12:1 NC 56-77 7-3 /4 2-13 /16 30 or 31 140 2.70:1 NC 56-80 8 2-13 /16 30 or 31 151 3.02:1 6-5/8 API Reg 8-1/4 2-13 /16 30 or 31 162 2.93:1 NC 61-90 9 2-13 /16 30 or 31 196 3.17:1 7-5/8 API Reg 9-1/2 3 30 or 31 217 2.81:1 NC 70-97 9-3 /4 3 30 or 31 230 2.57:1 NC 70-100 10 3 30 or 31 243 2.81:1 8-5/8 API Reg 11 3 30 or 31 300 2.84:1 My company information Hejian Deris Petroleum drilling equipment Co., Ltd was established in 2000, located in Hejian City Junziguan Industrial Park, next to National Highway 106, close to Tianjin Port, Beijing Airport, convenient transportation and superior location. The company covers an area of 30 acres and a factory building of 15,000 square meters. Specializing in the production and sales of drilling tools such as Tricone bit, PDC drill bits, Hole opener, roller cone drills, hammer and hammer bit, drill pipes, drill collars, etc. A professional design, production, inspection and foreign trade sales team has been established. . Products are sold to the United States, Canada, Russia, Kazakhstan, Iran, Qatar, Sweden, Germany, Australia, Singapore, Mexico, Colombia and other more than 30 countries. The sales volume reached 15,000 pieces of the roller cone, and the three-cone drill bit 5000 achieved. Our company is planning to build a new factory, adding 3 production lines, CNC machine tools, drilling machines, milling machines, quality testing equipment, etc. to ensure quality and timely delivery. Make sure that every quality product meets customer needs. Certificate Package and shipping Package Type : wooden case ,also be packaged according to customers requirement Transportation : by sea , by air or land transportation . Less than 50kg shipping by courier better Delivery : If we have stock, the delivery time will need about 2~3 working days. In general, common size tricone bits and pdc bit, we have stock. If we have no stock, such as the tci reamer and pdc hole opener, it will be 7-10 working days in total. If you are interested in our products please send Email to us How to complete the whole deal Step: 1. Firstly decide the design, material and color 2. Decide the size in accordance with client's requirement and our recommendation 3. We will give the best offer. 4. Client's accept the offer and we send proforma invoice. 5. Client transfers 30%-50% deposit and production begins 6. After production, we will send ready products photo 7. After client's /confirm/iation, we will arrange shipment, and send copy shipping documents like B/L,commercial invoice and packing list 8. Client transfer balance payment and we will send original documents by express or Telex Release FAQ 1. Are you a manufacturer? Yes, we are a professional driiling tools and machine parts manufacturer. And we have a professional R&D team. 2. What's products your company can provide? We can provide drilling bucket,core barrel,auger,drilling teeth,casing series,rotary rig accessories ect. 3. How do you control the quality of your products? First, we use good steel GB-Q345B.Our welding stick is flux-cored wire. Second, we have strict quality controlling system; Third, we promise good quality and after-sales service. 4. Can you produce according to special requirement? Yes, we can produce customized products. 5. How is your product price? We can give you factory price,more quantity,better price! http://www.welldrillingbit.com

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