For the setting casing operation, the ton-miles calculation of this operation is similar to round trip ton-miles calculation. Nevertheless, buoyed weight of the casing will be used into calculation instead of buoyed weight of drill pipe and with the result will be multiplied by 0.5, because setting casing is just only one-way operation (1/2 round trip).

Ton-miles for setting casing can be determined from the following formula:

**Tc = {Wp x D x (Lcs + D) + D x Wb} x 0.5 ÷ (5280 x 2000)**

Where; Tc = ton-miles setting casing

Wp = buoyed weight of casing in lb/ft

Lcs = length of one joint of casing in ft

Wb = weight of travelling block assembly in lb

D = depth of casing in ft

2000 = number of pounds in one ton

5280 = number of feet in one mile

**Example: Ton-Miles for Setting Casing**

Mud weight = 10.0 ppg

Casing weight = 25.0 lb/ft

Depth of casing = 5200 ft

Travelling block assembly = 95,000 lb

Length of one joint of casing = 42 ft

Solution:

**a) Buoyancy factor:**

BF = (65.5 – 10.0) ÷ 65.5

BF = 0.8473

**b) Buoyed weight of casing in mud, lb/ft (Wp):**

Wp = 25.0 lb/ft x 0.8473

Wp = 21.18 lb/ft

**c) Casing ton-miles**

Tc = {21.18 x 5,200 x (42 + 5,200) + 5,200 x 95,000} x 0.5 ÷ (5280 x 2000)

Tc = 50.73 tone-miles

Ton-Mile (TM) for Setting Casing Calculation Sheet

**Ref book: ** **Formulas and Calculations for Drilling, Production and Workover, Second Edition**

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hi ,

I have just noticed that the formula which given here for caculating running casing ton miles is wrong .

the correct formula is :

Tc={ [Wp * D * (Lcs + D) + (2D * 2Wb)] * 0.5 } / (5280*2000)

Regards.

The one you show is not correct. I have checked the reference book to verify the formula already.

Running mixed csg like 2 7/8″ TBG and 5″ cgs will change the formula?

Thanks in advance

No. The formula is the same but you need to use the correct weight for the string because the weight of tubing and casing is different.

I can’t download any of the ton mile excel sheet. Is it still available on the server?

It is in drilling formula spread sheet. You can subscribe to us and download it.