Rotary drilling method for well drilling
Rotary drilling method for well drilling
The commonly used rotary drilling method was promoted by the mining industry and later adopted by the petroleum industry. It is the most effective and widely used drilling method among all drilling systems. According to the main characteristics of the rotary drilling method, it can be called a fluid (mud, air) flushing and powerful drilling process. Drilling wells in this way is a natural development of hydrological well technology. In the United States, the early application of the slewing method was to drill water wells. Today, in oil, natural gas and other minerals and groundwater engineering, rotary drilling accounts for about 90%, which has gradually produced various forms of evolution.
It is generally believed that the drilling speed of positive circulation rotary drilling rigs is faster and the drilling depth is larger. Today most of the improvements in drilling technology and equipment are related to rotary drilling, such as air rotary drilling, mud/air rotary drilling, mud/ Air rotary-percussion drilling and reverse circulation drilling, etc., are improvements and developments of commonly used rotary drilling.
In foreign countries, the rotary mud drilling method is used to drill with roller cone bits to achieve higher drilling efficiency with high pressure and large pumping capacity. The usual drilling pressure is close to 10 tons, the feed length is about 6-8 meters, and the displacement of the mud pump is about 800 liters/min.