HFTS-1 Midland Basin Wolfcamp core-through-frac
Per-stage propped half-length, fracture count, and vertical containment from HFTS-1 through-fracture cores. Use to validate propped extent and height-growth in bounded Wolfcamp stacks.
Aggregate metrics
| Metric | n | MAE | RMSE | MAPE | Bias | P10/P50/P90 rel | Grade |
|---|---|---|---|---|---|---|---|
| proppedHalfLengthFt [ft] | 5 | 2596.422 | 2604.321 | 1056.9% | 2596.422 | 875.9 / 977.8 / 1288.9% | D |
| fracsPerStage [-] | 5 | 198.400 | 199.921 | 97.7% | -198.400 | 97.6 / 97.7 / 97.9% | D |
| heightAbovePerfFt [ft] | 5 | 5.600 | 7.092 | 6.0% | 2.400 | 1.0 / 5.3 / 12.1% | A |
| heightBelowPerfFt [ft] | 5 | 24.000 | 24.127 | 31.5% | 24.000 | 24.6 / 31.4 / 38.7% | C |
Per-case observed vs modeled
| Case | Metric | Observed | Modeled | Residual | Rel err |
|---|---|---|---|---|---|
| stage-a | proppedHalfLengthFt [ft] | 240.000 | 3063.275 | 2823.275 | 1176.4% |
| stage-a | fracsPerStage [-] | 190.000 | 4.000 | -186.000 | 97.9% |
| stage-a | heightAbovePerfFt [ft] | 95.000 | 100.000 | 5.000 | 5.3% |
| stage-a | heightBelowPerfFt [ft] | 75.000 | 100.000 | 25.000 | 33.3% |
| stage-b | proppedHalfLengthFt [ft] | 265.000 | 2701.877 | 2436.877 | 919.6% |
| stage-b | fracsPerStage [-] | 215.000 | 5.000 | -210.000 | 97.7% |
| stage-b | heightAbovePerfFt [ft] | 105.000 | 105.000 | 0.000 | 0.0% |
| stage-b | heightBelowPerfFt [ft] | 82.000 | 105.000 | 23.000 | 28.0% |
| stage-c | proppedHalfLengthFt [ft] | 210.000 | 3074.376 | 2864.376 | 1364.0% |
| stage-c | fracsPerStage [-] | 165.000 | 4.000 | -161.000 | 97.6% |
| stage-c | heightAbovePerfFt [ft] | 80.000 | 92.500 | 12.500 | 15.6% |
| stage-c | heightBelowPerfFt [ft] | 65.000 | 92.500 | 27.500 | 42.3% |
| stage-d | proppedHalfLengthFt [ft] | 285.000 | 2698.199 | 2413.199 | 846.7% |
| stage-d | fracsPerStage [-] | 240.000 | 5.000 | -235.000 | 97.9% |
| stage-d | heightAbovePerfFt [ft] | 118.000 | 110.000 | -8.000 | 6.8% |
| stage-d | heightBelowPerfFt [ft] | 90.000 | 110.000 | 20.000 | 22.2% |
| stage-e | proppedHalfLengthFt [ft] | 250.000 | 2694.381 | 2444.381 | 977.8% |
| stage-e | fracsPerStage [-] | 205.000 | 5.000 | -200.000 | 97.6% |
| stage-e | heightAbovePerfFt [ft] | 100.000 | 102.500 | 2.500 | 2.5% |
| stage-e | heightBelowPerfFt [ft] | 78.000 | 102.500 | 24.500 | 31.4% |
Benchmark inputs (per case)
| Case | Input | Value |
|---|---|---|
| stage-a | slurryVolumeBbl | 8,500 |
| stage-a | rateBpm | 82 |
| stage-a | proppantLbTotal | 480,000 |
| stage-a | clusterCount | 4 |
| stage-a | perfCountPerCluster | 6 |
| stage-a | payHeightFt | 200 |
| stage-a | stressBarrierAboveMpsi | 0.9 |
| stage-a | stressBarrierBelowMpsi | 0.6 |
| stage-b | slurryVolumeBbl | 9,100 |
| stage-b | rateBpm | 85 |
| stage-b | proppantLbTotal | 520,000 |
| stage-b | clusterCount | 5 |
| stage-b | perfCountPerCluster | 6 |
| stage-b | payHeightFt | 210 |
| stage-b | stressBarrierAboveMpsi | 0.85 |
| stage-b | stressBarrierBelowMpsi | 0.55 |
| stage-c | slurryVolumeBbl | 7,800 |
| stage-c | rateBpm | 78 |
| stage-c | proppantLbTotal | 430,000 |
| stage-c | clusterCount | 4 |
| stage-c | perfCountPerCluster | 5 |
| stage-c | payHeightFt | 185 |
| stage-c | stressBarrierAboveMpsi | 1 |
| stage-c | stressBarrierBelowMpsi | 0.7 |
| stage-d | slurryVolumeBbl | 9,600 |
| stage-d | rateBpm | 88 |
| stage-d | proppantLbTotal | 560,000 |
| stage-d | clusterCount | 5 |
| stage-d | perfCountPerCluster | 6 |
| stage-d | payHeightFt | 220 |
| stage-d | stressBarrierAboveMpsi | 0.8 |
| stage-d | stressBarrierBelowMpsi | 0.5 |
| stage-e | slurryVolumeBbl | 8,800 |
| stage-e | rateBpm | 83 |
| stage-e | proppantLbTotal | 500,000 |
| stage-e | clusterCount | 5 |
| stage-e | perfCountPerCluster | 6 |
| stage-e | payHeightFt | 205 |
| stage-e | stressBarrierAboveMpsi | 0.88 |
| stage-e | stressBarrierBelowMpsi | 0.58 |
Modeling assumptions
Textbook contained PKN (Nordgren 1972) without leak-off, length scaled by fluid efficiency; height fixed at pay. Software regression only — dataset is synthetic, unverified.
Assumed
- Stage rate split evenly across clusters; one fracture per cluster; propped length taken equal to created length.
- Assumed, not in the dataset and not tuned: viscosity 1 cp, Poisson's ratio 0.25, fluid efficiency 0.5, Young's modulus 4.5 Mpsi.
- Height contained to pay, split evenly above and below the perforation.
Out of scope
- Stress-barrier height growth (barrier stresses given but not used)
- Proppant transport and settling
- Grading — the per-stage values cannot be traced to the cited papers
Scoring breakdown
Grade bands (worst-metric rollup)
A · MAPE ≤ 10%
B · MAPE ≤ 20%
C · MAPE ≤ 35%
D · MAPE > 35%
| Metric | MAPE | Grade | Drives rollup? |
|---|---|---|---|
| proppedHalfLengthFt | 1056.9% | D | yes (worst) |
| fracsPerStage | 97.7% | D | yes (worst) |
| heightAbovePerfFt | 6.0% | A | no |
| heightBelowPerfFt | 31.5% | C | no |
Dataset rollup grade:
D
— the worst per-metric grade sets the card chip.Citations
Ciezobka, J., Courtier, J. & Wicker, J. (2018). Hydraulic Fracturing Test Site (HFTS) – Project Overview and Summary of Results. URTeC-2937168.
DOI / ref:
10.15530/URTEC-2018-2937168Gale, J. F. W., Elliott, S. J. & Laubach, S. E. (2018). Hydraulic Fractures in Core From Stimulated Reservoirs: Core Fracture Description of HFTS Slant Core, Midland Basin, West Texas. URTeC-2902624.
DOI / ref:
10.15530/URTEC-2018-2902624Elliott, S. J. & Gale, J. F. W. (2018). Analysis and distribution of proppant recovered from fracture faces in the HFTS slant core. URTeC-2902629.
DOI / ref:
10.15530/URTEC-2018-2902629Raterman, K. T. et al. (2019). Analysis of a drained rock volume: an eagle ford example. URTeC-2019-263-EG (methodology reference).
DOI / ref:
—Aggregate values from cited public URTeC/SPE papers and the DOE/GTI HFTS-1 program summaries. Reproduced under fair-use academic citation; no proprietary log/core data.
Compiled: 2026-07-13