China API Standard Drill Collar for Drilling

API Standard Drill (Bottom) Collar for Drilling
1. Introduction
Drill collar is used in the drilling of oil wells for weighting drill bit, enabling it to drill through rock. It is a bar made of solid steel, either plain carbon steel or non-magnetic steel alloy, drilled lengthwise to permit the passage of drilling fluids. Drill collar is the lowest element of a drill string, which encompasses all the elements of a downhole process from surface to rock bit.
Drill collar is typically 31 feet (about 9.45 m) long and threaded at both ends, male at one end and female at the other, to allow multiple drill collars to be joined above bit assembly. The number of drill collars attached to a drill string will depend upon the material composition of the strata at drill site and the likely depth of well.
Typically, drill collars will be consistent in length but may vary in diameter, and their outside configuration may be slick or spiral. The outside diameter may vary from about 3 inches (7.62 cm) to 11 inches (27.9 cm) and greater.
2. Classification
1) Slick Drill Collar
Drill Collar is an integral heavy-wall joint manufactured from a solid bar of modified alloy steel. The solid bar is quenched and tempered to obtain required mechanical properties, then trepanned, drifted and threaded. Drill collar is furnished as slick or spiraled in 30 or 31 foot lengths.
Slick drill collar is supplied with the mill as-rolled surface finish. Spiraled drill collar has grooves machined in its outside surface. The spiral grooves promote even flow of drilling fluid around collar diameter, equalizing pressure and reducing the occurrence of differential sticking.
2) Spiral Drill Collar
Spiral drill collar is used to reduce contact area with hole so as to avoid efficiently bit sticking from differential pressure. Our spiral drill collars are manufactured strictly according to API standard.
a. Materials: AISI 4145H alloy steel, non magnetic steel, etc.
b. Shape: It is a kind of drill collar which adds three dextrogyrate spiral grooves on the outer circle of ordinary drill collar when processing, to reduce the area of contact and friction with well wall, which can effectively prevent pressure sticking.
c. Usage: It is mainly used between drill head and drill pipe, so that it can make drill head work reposefully and keep right trace by providing the pressure and weight for drill head.
d. Standard: API Spec 7-1 or SY/T5144 Standard.
e. Inspection & Test: In the process of production, traceability are maintained from the receipt of raw material to the completion of final products, and serial numbers are die stamped on each work piece body. Inspection and test are performed in every manufacturing process.

3) Non-magnetic Drill Collar
The materials of non-magnetic drill collars are made from chrome manganese low carbon austenitic alloy, which has the following characteristics:
The chemical composition should be controlled strictly in the refining and forging process.
With excellent lower magnetic permeability, high strength of mechanical properties and outstanding resistant to stress corrosion cracking, and no tendency to galling.
3. Parameters

TypeOD(mm)ID(mm)L(m) ±152.4mm dDF(mm) ±0.4NC23-3179.431.89.1476.2NC26-3588.938.19.1482.9NC31-41104.850.89.14or9.45100.4NC35-47120.650.89.14or9.45114.7NC38-5012757.29.14or9.45121NC44-60152.457.29.14or9.45144.5NC44-60152.471.49.14or9.45144.5NC46-62158.857.29.14or9.45149.2NC46-62158.871.49.14or9.45150NC46-65165.157.29.14or9.45154.8NC46-65165.171.49.14or9.45154.8NC46-67171.457.29.14or9.45159.5NC50-70177.857.29.14or9.45164.7NC50-70177.871.49.14or9.45164.7NC50-72184.271.49.14or9.45169.5NC56-77196.871.49.14or9.45185.3NC56-80203.271.49.14or9.45190.16-5/8REG209.671.49.14or9.45195.6NC61-90228.671.49.14or9.45212.77-5/8REG241.376.29.14or9.45223.8NC70-97247.676.29.14or9.45232.6NC70-10025476.29.14or9.45237.38-5/8REG279.476.29.14or9.45266.7NC50-67171.571.49.14or9.45159.5

Mechanical PerformanceODYield StrengthTensile Strength σbElongationReduction of areImpactSizeσ0.2Mpa(psi)δ4%%Ft.1b Mpa(psi) 3 1/8~6 3/4≥758≥827≥1850≥50-110,000-120,0007~10≥689≥758≥20-100,000-110,000

Our team
Zhengzhou Maierda Petroleum Equipment Co., Ltd., located in Central China, is a professional supplier of oilfield equipment and tools.
Our factories has more than 15 years experiences of manufacturing oilfield equipment and tools.
Our sales team has more than 10 years importing exporting experiences in oil & gas industry.
Our products
We are specialized in such as casing centralizers, float collars and float shoes, cementing plugs, cement baskets, cementing heads, stage collars, sucker rods, drill pipes, drill collars and pumping units
our products are well sold in Mideast, North America, Latin America, Central Asia, Southeast Asia, Russia, North Africa, etc.
We are committed to providing high-quality and cost-effective products and services to our customers.
Our services
We guarantee and uphold the highest standards in customer service, client satisfaction, and quality product delivery in the oilfield industry. We are professional in many kinds of casing centralizers, float collars and float shoes, cementing plugs, cement baskets, cementing heads, stage collar, sucker rods, drill pipes, dill collars, etc.
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