Тандем - 2, шлакоблочные станки, бетоносмесители


Производство оборудования и технологии
Рубрики

Drop-off Section

For the drop-off portion of the hole, the forces acting on the unit section of the pipe are presented in Figs. 4.6 and 4.7. At equilibrium, the differential equation is:

Fig. 4.6 : Direction of the normal force. Fn. in a dropoff section. (After Maidla. 1987).

Fig. 4. 7: Forces acting on a small casing element within the dropoff section.

Fig. 4.8 : Vertical and plan view of a typical deviated well.

VERTICAL DEPTH

TRIHEDRON

i?: Tangent Unit Vector j?: Principal Normal Unit Vector [?: Binomial Unit Vector

Fig. 4.9 : Force acting on a small element within the buildup section. (After Maidla. 1987.)

EAST

DEPARTURE

SOUTH

DEPARTURE

VERTICAL

DEPTH

dF

(4.37;

—= fb(WRsma + Fa) + WR cos a da

When Eq. 4.37 is solved for the pulling out operation, the tensional load is given by:

Fa7 = I<D Fai — Y-~p ^ ~~ 1 ^S’n K° S’n 01 ‘

(4.38)

+ 2 fb (cos a2 — I’d cos Qj )] and similarly for the running in operation:

, WR r.

F —

A do

I<D Fai — T—J—>2 [(fb — 1 )(sin q2 — Ad sin «j) ‘ J b

(4.39)

■ 2 fb (cos a2 — KD cos Qi)]

where:

(4.40)

KD = eh(°2-a l)

Оставить комментарий