# ظرفیت فضای حلقوی

## به کمک این فرمول میتوانید ظرفیت فضای حلقوی لوله حفاری و لوله جداری را محاسبه کنید.

There are several different formulas for finding the annular capacity, below are some examples.

#### Formula 1:

Annular capacity in lin.ft/ft3 = 183.35 / (Dh2 — Dp2)

#### Example:

Hole size (Dh) = 12.75 in.

Drill pipe OD (Dp) = 6 in.

#### To solve:

` 1 : Annular capacity lin.ft/ft3 = 183.35 / (12.75)2 — (6)2 2 : Annular capacity lin.ft/ft3 = 1.45 lin.ft/ft3`

#### Formula 2:

Annular capacity in ft3/lin.ft = (Dh2 — Dp2) / 183.35

#### Example:

Hole size (Dh) = 12.75 in.

Drill pipe OD (Dp) = 6 in.

#### To solve:

``` 1 : Annular capacity ft3/lin.ft = (12.75)2 — (6)2 / 183.35
2 : Annular capacity = .6903 ft3/lin.ft
```

#### Formula 3:

Annular capacity in bbls/ft = (Dh2 — Dp2) / 1029.4

#### Example:

Hole size (Dh) = 12.75 in.

Drill pipe OD (Dp) = 6 in.

#### To solve:

``` 1 : Annular capacity in bbls/ft = (12.75)2 — (6)2 / 1029.4
2 : Annular capacity = .1229 bbls/ft
```

#### Formula 4:

Annular capacity in ft/bbls = 1029.4 / (Dh2 — Dp2)

#### Example:

Hole size (Dh) = 12.75 in.

Drill pipe OD (Dp) = 6 in.

#### To solve:

``` 1 : Annular capacity in ft/bbls = 1029.4 / (12.75)2 — (6)2 2 : Annular capacity = 8.13 ft/bbls
```

#### Formula 5:

Annular capacity in gals/ft = (Dh2 — Dp2) / 24.51

#### Example:

Hole size (Dh) = 12.75 in.

Drill pipe OD (Dp) = 6 in.

#### To solve:

``` 1 : Annular capacity gal/ft = (12.75)2 — (6)2/ 24.51
2 : Annular capacity = 5.16 gals/ft
```

#### Formula 6:

Annular capacity in ft/gal = 24.51 / (Dh2 — Dp2)

#### Example:

Hole size (Dh) = 12.75 in.

Drill pipe OD (Dp) = 6 in.

#### To solve:

``` 1 : Annular capacity ft/gals = 24.51 / (12.75)2 — (6)2 2 : Annular capacity ft/gals = .1937 ft/gals
```
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