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What is a drill collar? What are the classifications?

What is a drill collar? What are the classifications?

The drill collar is located at the bottom of the drill string and is the main component of the lower drilling tool assembly.

2023/12/04

Why is it necessary to use non magnetic drill rods or non magnetic drill collars when using MWD in oil drilling, rather than ordinary drill collars or pressure bearing drill rods？

Why is it necessary to use non magnetic drill rods or non magnetic drill collars when using MWD in oil drilling, rather than ordinary drill collars or pressure bearing drill rods？

As all magnetic measuring instruments sense the geomagnetic field of the wellbore when measuring its direction, the measuring instrument must be in a non magnetic environment. However, during the drilling process, drilling tools often have magnetism, which affects magnetic measurement instruments and cannot obtain accurate wellbore trajectory measurement information data. The use of non magnetic drill collars can implement a non magnetic environment and have the characteristics of drill collars in drillin

2023/11/29

One of the vulnerable mechanical parts in the process of oil drilling, drill pipe

One of the vulnerable mechanical parts in the process of oil drilling, drill pipe

With the rapid development of the oil and gas industry, there are more and more oil drilling companies, and the competition is also increasing. So for oil drilling companies, how to achieve "well, well, fast well"? First of all, there must be excellent drilling technology, new theory and practice guidance, followed by the use of excellent drilling equipment. However, in the face of complex and diverse geological structure, oil drilling is still faced with many factors such as deep borehole, high pressure and high temperature. One of the main factors affecting the production progress is the repair and replacement of production equipment parts after damage. Today, the oil distribution editor will take stock of those accessories and avoidance methods that are easily damaged in the process of oil drilling.

2023/08/25

Function and Characteristics of Geological Drill Pipe

Function and Characteristics of Geological Drill Pipe

Geological drill pipe is a geological drilling tool designed and produced by friction welding process of geological alloy steel pipe. The geological drill pipe body adopts geological special alloy steel pipe (R780, DZ50), and the geological drill pipe joint adopts high-quality alloy structural steel (42CrMo) through vacuum conditioning treatment, which greatly improves the fatigue strength and shear strength. The geological drill pipe adopts advanced friction welding technology for production and processing. The drill pipe has the characteristics of high bending strength and firm welding, which can ensure the straightness requirements for deep hole drilling, and has high fatigue strength and long service life.

2023/08/25

Specification and steel grade strength of drill pipe

Specification and steel grade strength of drill pipe

According to the regulations of the American Petroleum Institute (American Petroleum Institute)(API), drill pipes are divided into three categories according to length (L): the first category: 5.486-6.706m(18-22ft); The second category (commonly used):8.230-9.144m(27-30ft); The third category: 11.582-13.716m(38-45ft). Drill pipe can also be classified by outside diameter size. The sizes (d) of commonly used drill pipes are 88.9,114.3 and 127mm (customarily expressed in imperial sizes: 3 1/2 "4" 5 ").

2023/08/25

Introduction of joints of drill pipe

Introduction of joints of drill pipe

The drill pipe joint is an integral part of the drill pipe, which is divided into male and female joints and is connected to both ends of the drill pipe body. In order to enhance the connection strength of the joint, the wall thickness of the pipe body needs to be increased at the joint site. According to the thickening method, it can be divided into three forms: inner thickening, outer thickening, and inner and outer thickening. The thread on the joint is threaded (thick buckle), which is used to connect each single drill pipe. The thread of the drill pipe joint is a taper pipe thread with a sealing shoulder. The shoulder surface is tightened to play a sealing role, and the thread only plays a connecting role. Thickening way is different, the corresponding joint thread buckle type is also different.

2023/08/25

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