A mechanical thruster tool is a piston device that can be included in the drill string above the drilling bit or a motor. It is a specialist tool originally developed for slim hole drilling and is now available in sizes from 1-11/16″ up to 9-1/2″ in diameter. As the pressure inside the thruster increases, it …
Drill string vibrations can have a significant impact on the performance of oil and gas drilling operations. They can lead to premature wear and tear of drilling equipment, resulting in fatigue and induced failures such as drill pipe washout. Additionally, they decrease the drilling energy delivered to the bit. Therefore, it will cause a drop …
Safety joint can be used in drilling, fishing, drill stem testing, washover or any pipe string. It is a threaded connection with coarse threads or other special features that will cause it to unscrew before other connections in the string. It is one of the great tools that have been used in oil and gas …
A tool joint is a heavy coupling element for drill pipe. Tool joints have coarse, tapered threads and seating shoulders designed to: The tool joint is attached to the pipe by welding during the manufacture of the drill pipe joint. It has two parts, a pin and a box. Tool Joint Strength The strength of …
A hole opener is used when the successive hole sections could have been drilled using regular drilling bits but where, for one reason or another reason, a reduced diameter hole section known as a pilot hole was required at a particular depth. It is designed to fit onto the drill string and is commonly used …
Jars are approximately thirty feet long. Heavy-duty lift subs for tapered shoulder elevators are typically used for handling. Jar Safety Clamp When handling the Drilling Jar above the rotary table, the safety clamp must be on the Jar. This keeps the Jar in a safe, extended position while being handled. The safety clamp is removed …
Stick-slip torsional drill string vibrations manifest in low-frequency torque fluctuations of significant amplitude during drilling or coring operations. It is often seen as a groaning noise emanating from the top drive or rotary table. The period of oscillation is typical of the order of 2-10 seconds. This period corresponds to the first eigenfrequency of the …
Subs are short pieces of tubular material used to increase the versatility of the main component of the drilling string. The simplest is a crossover sub, which connects two items with different threads. Others used in the drill string are: Crossover Drilling Sub These are short sections of drill collar material 0.6 m (2 ft) …
In general, the neutral point can be defined as the point in the drill string where there is a change from tension to compression in the axial stress or the point that is zero tension and zero compression. The location of this neutral point depends on WOB and the Bf buoyancy factor (that depends on …
When manufactured, the new drill pipe will be subjected by the manufacturer to a series of mechanical, tensile, and hydrostatic pressure tests & inspections by API Specifications 5A and 5AX. This will ensure that the pipe can withstand specified loads. A joint of drill pipe will however be used in several wells. When it has …
