Drilling Strings


We supply the whole set of drilling string, including Drilling Pipe, Drilling Collar, X-over, Stabilizer and other tools. High quality Carbon Steel has been used as the raw materials to make sure the quality would meet the requirement of different drilling conditions. QA & QC are applied for all the manufacture procedures, while the product has related API and ISO certificate.

  • Drilling Pipe
    Drill pipe is a kind of piping used on a drilling rig. It assists with wellbore drilling, which is the process of digging a hole in the ground so as to get a particular natural resource, such as oil or water or gas. The pipe pumps drilling fluid, which generates pressure to keep unwanted fluids out of the liquid pumped, removes drill cuttings, and helps to cool and clean the drill bit. Most drill pipes are made of a thick layer of steel. There are usually about 30 to 33 feet (9.1 to 10 meters) long, though they come in several lengths. They also come in several different weights and strengths in order to accommodate a wide array of rig sizes.
  • Heavy Weight Drilling Pipe
    Heavy weight drill pipe is the most commonly used in the vertical section of the hole and provides weight on the bit for directional drilling while maintaining more flexibility than a drill collar. Heavy weight is also known as hevi-wate or HWDP in the oil industry. Heavy weight drill pipe has a "center upset", also known as wear pad, that increases tube life by protecting the tube from wearing on the outer diameter by keeping the tube away from the hole wall. It also reduces hole drag and differential sticking problems. The walls of heavy weight drill pipe are thicker and have longer upsets compared to conventional drill pipe, as well as being stronger with high tensile strength. There are a diversity of specifications of heavy weight drill pipe.
  • Drilling Collar
    A drill collar is an equipment for weighting the drill bit used in the drilling of oil wells, 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 contains all the elements of a down-hole process from the surface to the rock bit. This equipment are 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 the bit assembly. The number of drill collars attached to a drill string will base on the material composition of the strata at the drill site and the likely depth of the well.
  • Stabilizer
    Ship stabilizers are fins or rotors mounted beneath the waterline and emerging laterally from the hull to reduce a ship's roll because of wind or waves. Active fins are controlled by a gyroscopic control system. When the gyroscope senses the ship roll, it changes the fins' angle of attack to exert force to counteract the roll. Fixed fins and bilge keels do not move; they reduce roll by hydrodynamic drag exerted when the ship rolls. Stabilizers are mostly used on ocean-going (blue water) ships.
  • X-over
    X-over, also named cross over sub acts for conversion and connection of drill stem component in petroleum, natural gas and geology drilling work. It is used mainly for connecting of upper drill tools and lower drill tools during drilling operations. X-over sub is API standard Material is AISI 4145H chromium-molybdenum steel. We can offer X -over, Drill collar cross-over sub, Drill bit cross-over sub, Swivel cross-over sub, Fishing cross-over sub, etc.
  • Safety Joint
    For protecting against stuck fish securing the entire fishing into the wellbore, safety joint serve as a positive release in the event that the catch tool cannot be released. Internal seats eliminate leak paths, which enables a high circulating pressure, and O-rings seal the joints to ensure hydraulic integrity when using high-circulation washpipe. Safety joints are designed to withstand high torsional, axial, and impact loads in a wide range of washover, drilling, and fishing applications.
  • Downhole Motor
    Downhole motor is a kind of downhole dynamic drilling tool upon the power of drilling mud. Mud stream from the outlet of mud pump flows through a by-pass valve into the motor. This stream produces pressure loss at both inlet and outlet of the pump, to push the rotor into rotating, and to transmit the torque and speed onto the bit. The downhole motor property mainly depends upon its property parameters. Downhole motor can be configured to answer specific downhole conditions or well designs. Using the latest available technology and materials a wide variety of possible configurations permits the use of downhole motors in an extensive range of drilling applications.
  • Drilling Jar
    Drilling Jar is a kind of safety tool. When testing tool get stuck, you can use bumper to unfreeze the tool and carry on shocking pipe string. When using this bumper, you should exert a pulling power to the pipe string first, and then releasing the pulling power on the bumper so that the drill stem contracts after the drill stem is stretched. At this time, an impact will act to a jammed tool. If you need multiple shocks, you can operate the bumper repeatedly and repeat the above procedures to obtain.
  • Absorber
    A shock absorber — often just called a "shock" — is a mechanical apparatus whose primary purpose is to cushion movements and impacts. It is often found in automobiles, where it is used to provide a smoother ride. In construction, a shock absorber is commonly called a damper. It serves as a safety measure to help minimize a structure's movement caused by natural forces such as strong winds and earthquakes. Shock absorbers work by absorbing excess kinetic energy usually resulting from sudden or strong movement. The kinetic energy is then discharged by storing or transforming it into another form of energy. Absorption and dissipation of energy varies depending on the type of shock absorber used.
  • Kelly
    It is kelly bar drive head and upper fitting, which is used to joint the drilling bucket or auger. usually, it contains two types: one pin or two pins, and with 200 square. Kelly bars have three types: friction kelly bar, interlocking kelly bar (it normally has intermittent pressure type and continuous pressure type), combined type kelly bar.