Welcome to Oil Country Tubular Limited

OCTL's wide product range covers Drill Pipe, Heavy Weight Drill Pipe, Drill Collars,Production Tubing, Casing, Tool Joints, Couplings, Pup Joints, Subs, and Cross Overs.

PRODUCTS

	Drill Pipe			Tubing
	Heavy Weight Drill Pipe			Casing
	Drill Collars			Accessories

Drill Pipe

OCTL offers a complete range of drill pipe with tool joints attached from 2 3/8" OD to 5 1/2" OD according to API Specification 7 and guidelines presented in API RP7G and Premium Specifications.

Drill Pipes with 95% Remaining Body Wall and Extra Long Tool Joints and Special Grades are also offered upon Customer's request.

OCTL Drill Pipe and Tool Joints are manufactured from the finest quality steel available. Each step of the manufacturing process is performed with the highest degree of accuracy to meet or exceed API Specifications as well as the Industry Standards.

Plain End Pipes and Tool Joint Forgings are ordered to specific metallurgical chemistries and are matched for physical properties, welding compatibility, weld strength and product integrity.

Plain end pipe is upsetted and heat-treated full length by the Quench and Temper process to achieve uniform mechanical properties. The upset profile is designed to blend with the inside diameter of the pipe body with a generous radius giving a smooth transition from the thicker cross section of the upset to the pipe body. The smooth transition minimizes the stress concentrations.

The heat-treated pipe is tested for tensile and impact properties and are 100% nondestructively inspected for possible longitudinal and transverse defects, wall thickness and grade verification. Dry magnetic particle inspection of the upset ends is done to ensure that the upsets are free from defects. The OD & ID and face of the upsets are CNC machined for a clean surface as part of pipe preparation prior to welding.

Tool Joint Forgings are turned, bored and faced prior to heat treatment by the Quench and Temper process to produce a uniform microstructure, high ductility, and other mechanical properties in accordance with API Specifications. The heat treatment is done under controlled atmosphere for consistent quality. The hardness of every tool joint is checked by Brinell Hardness Tester and recorded. The tensile and impact properties are verified by destructive testing of a tool joint representing each process batch. Every tool joint is subjected to wet magnetic particle inspection, both transverse and longitudinal, to insure the absence of defects.

Threads are precision machined on CNC lathes. All connections are 100% inspected for thread parameters and phosphatized either with Zinc or Manganese for antigalling treatment.

Tools joints are attached to the drill pipe tube by friction welding to produce a high integrity solid state weld connection between the tool joint and the upset drill pipe tube. The process involves the rotation of one surface against a second surface at a relatively high speed and under heavy pressure. The friction between the tool joint surface and the pipe surface generates heat, causing the contact surfaces to reach a high temperature, below the melting temperature, at which they are forged together, producing the weld. Every weld is monitored and recorded in a strip chart.

The OD and ID weld rams are removed by shearing and machining. Post weld heat treatment of the heat affected zone between the drill pipe upset and the tool joint is carried out to restore the properties of the weld zone. The post weld heat treatment is a Quench and Temper process by which the weld zone is first brought to its austenitizing temperature, and then polymer quenched. An area wider than the weld zone is then re-heated by induction to tempering temperature. Every post weld heat treatment is monitored and recorded in a strip chart. Each weld is 100% inspected for hardness to confirm that they were adequately tempered. The post weld heat treatment process consistently produces stronger, tougher, and more uniform weld properties and a desirable microstructure which maximizes the resistance to stress and fatigue.

Surfaces adjacent to the weld line are smooth finished on both the OD and ID. Precision machining and grinding provides a surface finish that is free of stress risers. Each weld area is 100% inspected using wet magnetic particle and ultrasonic inspection techniques. Destructive testing of the weld covering tensile, yield, impact and bend test are carried out for every defined lot and are documented.

The Quality Control involves sampling at defined and random intervals for process control.

All the tests and inspection results and product traceability data are fully documented and maintained in a computerized data base. At any time, the Customer can be provided with a comprehensive account of his product.

Traceability

For each drill pipe component, complete product and process traceability is maintained from the raw material to the completion of all the manufacturing . For the pin and box tool joints, the mill test certificates are confirmed by incoming testing and each tool joint is provided with a unique product number and this product number gives the traceability through out the manufacturing process. The same procedure is applied to the pipe for it's traceability.

Complete documentation is provided with each shipment detailing the full Quality Control records likeQuality Clearence Certificate
Length Tally Sheet

Drill String Assembly Data which includes the product number of each component (Pin and Box and Pipe), heat numbers of each component, finished length, upset to upset length & weight of each pipe.

Mill Test & Inspection Certificate which includes chemical analysis for all pipe and tool joints , mechanical results of pipe and upset and tool joints, and mechanical results of test welds.

Non Destructive Test Certificate

Any other documentation per Customer's request can also be provided.

Options available on customer's request:

Extra Long Tool Joints: to provide increased space for connection rework and for tong handling

Make and Break of Tool Joints: break the joints in by making up three times to their recommended make-up torque. This option ensures proper initial make-up of tool joints which affects the life of the tool joint connections. Saves rig time.

Cold Rolling: of thread roots to create a pre-stress compression loading condition which increases fatigue life by increasing resistance to crack initiation.

Hardfacing of Tool Joints

SmoothX®: provides a smooth surface with little or no exposed carbide to minimize the tool joint wear

Super SmoothX®: for applications requiring maximum casing protection provided by a "machine finish" surface

CASING PLUS®: for a very hard but smooth surface that simultaneously protects both the tool joint and the casing in which it is run

ARNCO 100XT™ / ARNCO 200XT™ / ARNCO 300XT™

ARMACOR M™

Internal Plastic Coating

Internal Plastic Coating of Drill Pipe improves the performance and life of the drill pipe.

The Drill Pipe is thermal cleaned and the internal surface is blasted with grit for a good anchor pattern preparatory to Coating. A two stage application of phenolic / epoxy liquid coatings is sprayed on to the internal surface of the drill pipe in a controlled manner and thermal cured at each stage. This ensures uniform coating thickness and Quality throughout the length of the Drill Pipe.

The finished Drill Pipe is externally coated with rust preventive varnish, attached with Thread Protectors and Skid Bundled with utmost care.

Our integrated facility gives us the 'Competitive Edge' to manufacture and supply Drill Pipe to your complete satisfaction.

Manufacturing Process (Drill Pipe)