Table 12 Experimental Bo values and the XGBoost model estimations for four Iranian oil samples at different pressures.

From: Enhanced machine learning—ensemble method for estimation of oil formation volume factor at reservoir conditions

Sample 1

Sample 2

P (psia)

Real Bo (bbl/STB)

Model Bo (bbl/STB)

P (psia)

Real Bo (bbl/STB)

Model Bo (bbl/STB)

5058

1.264993

1.263273

5058

1.269586

1.269956

4057

1.271601

1.272116

4057

1.276778

1.277404

3054

1.278784

1.279456

3054

1.284824

1.283406

2551

1.282781

1.281855

2551

1.289471

1.287139

2148

1.286200

1.286202

2248

1.292532

1.292635

2046

1.287120

1.288550

2148

1.293607

1.292635

1942

1.288076

1.288924

2046

1.294728

1.295759

1842

1.289012

1.288924

1942

1.295899

1.298283

1743

1.289957

1.289285

1842

1.297055

1.297930

1688.769

1.290442

1.291468

1692.429

1.298694

1.302322

1348

1.266570

1.265986

1386

1.271466

1.274578

1019

1.239040

1.243145

1036

1.241328

1.243556

688

1.212583

1.215799

682

1.210465

1.211540

358

1.178781

1.182006

330

1.170797

1.167173

14.7

1.059500

1.058335

14.7

1.067100

1.065139

Sample 3

Sample 4

P (psia)

Real Bo (bbl/STB)

Model Bo (bbl/STB)

P (psia)

Real Bo (bbl/STB)

Model Bo (bbl/STB)

5049

1.372511

1.376968

5557

1.310795

1.309808

4050

1.384720

1.386455

5058

1.314791

1.312617

3047

1.393742

1.396921

4057

1.323210

1.322753

2543

1.404223

1.402851

3054

1.332665

1.328542

2442

1.404594

1.404133

2248

1.341454

1.339894

2341

1.404594

1.405437

2148

1.342729

1.339894

2241

1.406945

1.406750

2046

1.344060

1.342788

2140

1.404457

1.408102

1942

1.345451

1.343368

2039

1.406495

1.409479

1842

1.346824

1.345261

1977.934

1.412340

1.410265

1743

1.348221

1.347062

1686

1.369929

1.386076

1643

1.349671

1.349845

1383

1.349317

1.357261

1568.62

1.350668

1.350203

1079

1.319025

1.328358

1236

1.316720

1.302710

774

1.292498

1.299005

935

1.287005

1.285658

368

1.245166

1.249311

632

1.254527

1.253684

14.7

1.077700

1.074200

330

1.211657

1.226408

   

14.7

1.074100

1.074109

  1. Significant values are in bold.