What are the reasons for the fracture of drill pipes in the process of drilling wells?

Classification:

Company News

Release time:

2021-05-12

【Summary Description】 What are the factors that affect the quality of drill pipe?

钻杆

The drill pipe often occurs when the rod body is broken, the drill is lost, the connector is broken, etc., which makes people very upset. So...drill pipeWhat are the reasons for the fracture?

The drill pipe is first selected for the drilling tool. If the drilling tool uses the usual stainless steel plate, its flexibility, hardness standard and wear resistance cannot meet the standard specification of geological drilling. The friction damage during drilling is relatively serious, and it is very easy to distort when subjected to horizontal vibration, thus causing bending and deformation of the hole.

Nowadays, the vast majority of domestic manufacturers all use high-quality raw material drill pipe, drill pipe body application isR780Raw material, the connector is selected42CrMoof raw materials. It ensures that the drill pipe has the characteristics of high compressive strength, large rotating torque and stable operation.

The second isdrill pipeThe production process of the drill pipe is mainly surface quenching, friction welding, thread production and processing.

The very important stage is friction welding and thread production and processing. Under the pressure effect, friction welding makes full use of the relative movement between the touching end faces of electric welding to form friction heat and plastic bending deformation heat on the friction surface and its surrounding area under the effect of stable or gradually increasing water pressure and its torque, so that the ambient temperature in the surrounding area rises to an ambient temperature range close to but usually less than the melting point, the bending deformation resistance of the raw material is reduced, the plasticity is improved, and the oxide film of the operation interface is broken. Under the action of the top forging pressure, the plastic deformation and fluidity of the raw material are formed, and the solid-state welding method of electric welding is completed according to the molecular diffusion and recrystallization of the operation interface.

Professional automatic technology production and processing equipment is selected for thread production and processing, which reasonably and effectively ensures the processing accuracy of each product. The production process of friction welding before thread production and processing ensures the coaxiality standard for connecting several drill pipes during deep hole drilling. Compared with products of the same category, it has the characteristics of high compressive strength, large rotating torque, stable operation, etc.

Key words:

weilida drill