In case of a drill string failure, such as pipe washout or twist-off, it is crucial to determine the cause of the failure to prevent it from happening again. This text covers the most common failure mechanisms, of which there are over a dozen, and provides a general understanding of what to do in each …
A drill pipe is a seamless tube with special threaded couplings called tool joints. It is used to transmit rotary power from the surface to the bottom of the hole and to supply fluid at sufficient volume and pressure to the drill bit. Typically, it is the most extended & significant section of the Drill …
There are mainly two types of drill pipe connection threads, which are API Connection & Non-API Connection. API Drill Pipe Connection Thread Types Numbered Connections In 1968, API introduced ” NC ” connections to cover many needs, from macaroni tubing to 12-inch stiff drill collars. At the same time, API declared that the “IF” and …
The Drilling BHA is a very slender structure with a length-to-width ratio exceeding 500. Buckling will occur at high WOB. The buckling of the BHA string hurts overall drilling performance. It induces extra friction, leads to additional loading of components, and can induce violent dynamic behavior in the BHA, which can cause tool or drill …
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 significantly impact the performance of oil and gas drilling operations. They can lead to premature wear and tear of drilling equipment, resulting in fatigue and induced string failures such as drill pipe washout. Additionally, they decrease the drilling energy delivered to the bit. Therefore, it will cause a drop in the …
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 (API drill pipe specifications). It has two parts, a pin and a box. Tool Joint …
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 …