Wellbore Genius
My fracture, and what it does to the pad
Type in the fracture you actually believe in — its half-length, its average width, its height — and the proppant that filled it. The page reads that against your pad plan's own stage spacing, rock stiffness and slurry volume: the squeeze it lays on the next stage, the fluid efficiency the volume implies, and how far the pack reaches. Nothing here changes the plan.
No cored rock imported yet
The squeeze and efficiency below run on the plan's fitted stiffness and closure stress. Import a core report on the import page and this page will read the squeeze against your own rock instead.
The fracture and its proppant
No fluid imported yet, so this reads against the library starting plan — 250 ft spacing, 6 clusters.
Fracture geometry
Proppant properties
Width is entered as an average over the face; the shadow kernel needs the peak aperture, so it uses 0.178 in — the elliptical section of the same fracture.
What this fracture does to the plan
A 900 ft by 0.140 in fracture lays 109 psi on the next stage at 250 ft spacing and implies 35.9 % fluid efficiency, with pack out to 92 ft.
Squeeze on the next stage
109 psi
1.4 % of closure stress
Fluid efficiency implied
35.9 %
3,024 ft³ stored of 8,423 ft³ pumped per cluster
Propped half-length
92 ft
limited by pack volume
| Number | Value | How it was reached |
|---|---|---|
| Squeeze on the next stage | 109 psi | Every one of the 6 clusters casts its own shadow at 42 ft apart, summed at the plan's 250 ft stage spacing. |
| Squeeze as a share of closure stress | 1.4 % | Against the plan's 7500 psi minimum stress. |
| Spacing that holds squeeze to 200 psi | 188 ft | Distance at which this fracture's summed shadow falls to 200 psi. |
| Stored volume, one fracture | 3,024 ft³ | 2 × (4/5) × half-length × height × average width — the PKN taper. |
| Net pressure this width implies | 195 psi | w_max × E′ ÷ (2 × height), on the plan's 4.73 Mpsi plane-strain modulus. |
| Net pressure the rock's strength asks for at the tip | 5 psi | K_IC = 1000 psi·√in as the plan carries it — no strength in the core — over √(π x_f). |
| Net pressure left over after the tip takes its share | 190 psi | This aperture drives the tip with 190 psi to spare on the plan's fitted strength. |
| How far this net pressure can drive the tip | 1 ft | x_f = K_IC² ÷ (π p_net²) on the plan's fitted 1000 psi·√in, against the 900 ft entered. |
| Stress the next stage's rock carries | 7,609 psi | 7500 psi of fitted minimum stress plus this stage's 109 psi squeeze. |
| Pressure inside the fracture while it grows | 7,695 psi | 7500 psi of fitted minimum stress plus the 195 psi this aperture implies. |
| Fluid efficiency this geometry implies | 35.9 % | Stored volume ÷ the 8423 ft³ of slurry each cluster took. |
| Volume left in the rock | 5,399 ft³ | Whatever the pumped slurry did not store in the fracture. |
| Propped half-length | 92 ft | Set by pack volume; 10 % of the hydraulic length carries pack. |
| Areal proppant on the propped face | 1.238 lb/ft² | Pack spread over the settled bank band, 95 ft tall. |
Worth knowing
- No rock strength in the core, so the tip runs on the plan's fitted 1000 psi·√in rather than measured toughness.
My fracture against the solver's
Press “Solve the plan to compare” and the kernel's own geometry lands beside yours.
| Number | Mine | Solver | Δ |
|---|---|---|---|
| Hydraulic half-length | 900 ft | not solved yet | — |
| Average width | 0.140 in | not solved yet | — |
| Height | 180 ft | not solved yet | — |
| Propped half-length | 92 ft | not solved yet | — |
| Squeeze on the next stage | 109 psi | not solved yet | — |
| Fluid efficiency | 35.9 % | not solved yet | — |
If the fracture were different
The same plan, the same proppant, only the geometry moved — so you can see which of length and width the squeeze and the efficiency actually follow.
| Case | Half-length | Average width | Squeeze | Efficiency | Propped |
|---|---|---|---|---|---|
| Half the length | 450 ft | 0.140 in | 109 psi | 18.0 % | 94 ft |
| A quarter shorter | 675 ft | 0.140 in | 109 psi | 26.9 % | 93 ft |
| As entered | 900 ft | 0.140 in | 109 psi | 35.9 % | 92 ft |
| A quarter longer | 1,125 ft | 0.140 in | 109 psi | 44.9 % | 92 ft |
| Half again as long | 1,350 ft | 0.140 in | 109 psi | 53.9 % | 92 ft |
| A third narrower | 900 ft | 0.093 in | 73 psi | 23.9 % | 140 ft |
| A third wider | 900 ft | 0.187 in | 145 psi | 47.9 % | 69 ft |
| Wider and longer | 1,125 ft | 0.187 in | 145 psi | 59.8 % | 69 ft |
How each number was reached
Every step, in the order the page took it. The plan itself lives on the pad plan page.
- Width entered as an average, so the kernel's peak aperture is 0.178 in (elliptical section, 4/π).
- Plane-strain modulus 4.73 Mpsi from the plan's 4.50 Mpsi and ν = 0.220.
- Minimum stress 7500 psi as the plan carries it.
- Squeeze summed over 6 clusters 42 ft apart, Olson β = 1.
- Slurry per cluster 8423 ft³ from 9000 bbl per stage.
- Proppant per cluster 75000 lb, of which 29 % is taken to reach this fracture.
- Tip pressure 5 psi = 1000 psi·√in ÷ √(π × 10800 in), on the plan's fitted toughness, against the 195 psi this aperture implies.
- Stress on the neighbour 7609 psi = 7500 psi minimum stress + 109 psi squeeze; the fracture itself has to be held at 7695 psi to keep growing.