Estimation of Wellbore and Formation Temperatures during the Drilling Process under Lost Circulation Conditions

Table 1

Basic data of drill string assembly and casing program.

	Drill pipe	Drill collar	First casing	Second casing	Third casing
Inner diameter (mm)	151	70	486	318	224
Outer diameter (mm)	168	171	508	340	244
Depth (m)	4000	—	600	1500	3000
Depth to cement (m)	—	—	0	300	1400