Abstract
The challenges such as large frictional drag, difficult weight-on-bit transmission, and low rate of penetration are frequently met in modern directional drilling, especially in horizontal well dril...
Highlights
Directional drilling has been widely used in oil and gas drilling throughout the world such as horizontal wells, highly deviated wells, and extended reach wells
There are many problems met in directional drilling, especially in horizontal well, such as large frictional drag, difficult weight-on-bit (WOB) transmission, and low rate of penetration (ROP)
If the trajectory in the horizontal section is long enough, the dead weight of the drilling tools and frictional drag will become excessively large; as a result, the WOB cannot be effectively transferred to the bit due to the large frictional drag caused by the contact between drill string and borehole wall
Summary
Directional drilling has been widely used in oil and gas drilling throughout the world such as horizontal wells, highly deviated wells, and extended reach wells. The theoretical analysis of the working mechanism and optimization parameters of the agitator involves the contact and impact between the drilling string and borehole wall, and the random interaction between the bit and rock.
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