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China, Chinese BHA Downhole Drilling String API Drill Collar1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Industrial Products Supplier Manufacturer List Catalog
Other Petroleum Equipments MachineryDrill CollarSpiral Drill Collar
Dongying City Kenli District Jinxiu Petroleum Machinery Co., Ltd
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Product Description API Drilling String BHA standard and Non-magnetic Spiral Straight Drill CollarProduct DescriptionDrill 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. 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 are heavy and stiff steel tubular, and they are used at the bottom of a BHA to provide weight on bit. There are different kinds of DCs available such as flush or spiral DC. In directional drilling, spiral DCs are preferable because the spiral grooves reduce the wall contact area by 40% for a reduction of weight of only 4%. Hence, chances of differential sticking can be greatly minimized. There are other classifications of DCs as mentioned in the following. Nonmagnetic drill collars: NMDCs are generally flush (nonspiral). They are manufactured from high-quality, corrosion-resistant, stainless steel. They are used while running the magnetic survey instruments to be located in a NMDC of sufficient length to allow the measurement of the earth's magnetic field without magnetic interference. Survey instruments are isolated from magnetic disturbance caused by other steel components in the BHA.Detailed Photos Product ParametersDrill Collar ConnectionDrill Collar Diameter(in)Bore Diameter(in)Length(ft)Linear Weight (Approx.) (lb/ft)Displacement (Open End) (US gal/ft)Bending Strength RatioNC 23-313-1/81-1/430220.3372.57:1NC 26-35 (2-3/8 IF)3-1/21-1/23026.70.4082.42:1NC 31-41 (2-7/8 IF)4-1/8230 or 3133.650.5152.43:1NC35-474-3/4230 or 3146.810.7162.58:1NC 38-50 (3-1/2 IF)52-1/430 or 3153.290.8152.38:1NC 44-6062-1/430 or 3182.611.2642.49:1NC 44-6062-13/1630 or 3175.91.1612.84:1NC 44-626-1/42-1/430 or 3190.521.3852.91:1NC 46 -62 (4IF)6-1/42-13/1630 or 3183.811.2822.63:1NC 46 -65 (4IF)6-1/22-1/430 or 3199.521.5222.76:1NC 46-65 (4IF)6-1/22-13/1630 or 3192.811.423.05:1NC 46-67 (4IF)6-3/42-1/430 or 31108.521.63.18:1NC 50-70 (4IF)72-1/430 or 31117.521.7982.54:1NC 50 -70 (4IF)72-13/1630 or 31110.771.6942.73:1NC 50-72 (4IF)7-1/42-13/1630 or 31119.811.8333.12:1NC 56-777-3/42-13/1630 or 31139.92.142.70:1NC 56-8082-13/1630 or 31150.812.3073.02:16-5/8 REG8-1/42-13/1630 or 31161.812.4722.93:1NC 61-9092-13/1630 or 31195.812.9953.17:17-5/8 REG9-1/2330 or 312173.3192.81:1NC 70 -979-3/4330 or 312303.5182.57:1NC 70-10010330 or 31242.973.7172.81:18-5/8 REG11330 or 312994.5742.84:1Standard FeaturesAPI Boreback Box ConnectionAPI stress relieve groove pin connectionCold Rolling Thread rootsPhosphate coated connectionsOptionsSpiral grooved or Non-Spiral (Slick Type)Type of Hardband and Hardband configurationElevator and Slip recesses or Slip Recess onlyOther type of connections to meet specific needsProtectionStandard Pressed Steel Thread Protectors. Cast Steel Lifting Bail Thread Protectors upon request.Mill Test CertificatesIssued in accordance with API 7/7-1 and API RP7G specifications.Third Party Inspection can be performed on request at buyer's care and expense.Company ProfileFAQ1) How can I place an order?A: You can contact us by email about your order details, or place an order online.2) How can I pay you? A: After you confirm our PI, we will request you to pay. T/T and Western Union are the most usual ways we are using. 3) What's the order procedure?A: First we discuss order details and production details by email or TM. Then we issue you a PI for your confirmation. You will be requested to do prepaid full payment or deposit before we go into production. After we get the deposit, we start to process the order. We usually need 15-25days if we don't have the items in stock. Before production has finished, we will contact you for shipment details, and the balance payment. After payment has been settled, we start to prepare the shipment for you. 4)How do you take care when your clients received defective products?A: replacement. If there are some defective items, we usually credit them to our customer or replace them in the next shipment. 5)How do you check all the goods in the production line?A: We have spot inspection and finished product inspection. We check the goods when they go into the next step production procedure
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