Custom drill pipes
CJSC «Mining technologies» manufacture custom drill pipes at their plant. All products are fully certified as complying with the relevant GOST technical standards and ISO quality standards. The company delivers worldwide.
Features of drill pipe design
A locking mechanism connects drill pipes to the drill string, which transmits rotary motion, torque and axial load to the drill bit. It also forms the conduit along which fluid or compressed air can flow to and from the well face.
Drill pipes are subjected to high stresses during drilling. Therefore they must be constructed from high carbon or alloy steel that is then hot or cold-rolled seamlessly. Pipe ends endure the maximum loads and are reinforced with outer or inner casing. Combined inner and outer (upset) strengthening can be applied to solid pieces using additional mechanical or thermal processes. Thickened transmitting joints complete the pipe end design.
Drill pipe classification
Drill pipes are usually defined as being standard drill pipes, Kelly bars or drill collars. Drill collars are intended to deliver extra weight to the tool and are manufactured with thicker walls to provide additional reinforcement. Kelly bars transmit rotary motion and torque from the drill rig drive to the drillstring and are square or hexagonal steel bars.
The connection method distinguishes different types of drill pipes:
- Ring tool joints, with a conical head and threaded, are the most common connection mechanism;
- Nipple-jointed pipes are frequently used for exploratory core drilling and these pipes can have diameters of anything up to 60 mm;
- Designs with non-detachable welded locks make for a completely smooth external surface.
Welded lock drill pipes: technical specification and features
The benefits of both nipple joint and ring tool design can be incorporated by a combination of nipple and couplings at the drill pipe’s upset end. This requires more complex production technology and increased labor cost.
CJSC «Mining technologies» can manufacture custom designs to a customer’s technical specification or drawings. These are engineered and certified to the appropriate standards demanded by domestic and international regulations, which include:
API (American Petroleum Institute) - A leading developer of standards relating to oil and gas extraction equipment
- API Spec 5D : Specifications for drill pipes
- API Spec 7 : Specifications for rotary drill stem elements
Benefits of welded lock drill pipes
Thermal HFC (High Frequency Currents) surface hardening contributes additional wear resistance and higher quality. This helps to minimize or bending during drilling operations.
Carbonitriding thread joints adds increased wear resistance and creates barriers against slippage, reducing the risk of failure due to thread wear.
Friction welding, using specialist welding machinery, connects the lock mechanism with the pipe body to achieve an exceptionally accurate degree of alignment of pipe and lock. The resulting ideally balanced column enables higher speed drilling combined with lower power consumption.
The balance of the drill column and its smooth housing markedly reduces well wall damage. Wear is also more even along the length of the drill pipe and lock body.
Payment method and delivery
The agreed contract covers the terms of manufacturing and the delivery schedule and method for the batch. The invoice is then issued and payment is made by bank transfer. Production begins once cleared payment has been received. The deliverables are shipped by the transport company.
The manufacturing process usually takes about 30 days but depends on the size and complexity of the order.
Delivery is by container and the schedule is established by the freight forwarder.