GAS PROCESSING: GOOD MONEY ON WASTE

Let’s analyze potential gas-processing options for a small oil company. It is extracting up to 120 mln scm of associated petroleum gas per year. Currently the gas is flared.

A gas pipeline of intermediate pressure (3.5 Mpa) passes 10 km away from the oil treatment unit, where oil and gas are separated. Technical specs for adding the gas to the pipeline are as follows: -10°С dew point for water, -5°С dew point for hydrocarbons. Company’s oilfield can be reached by wheeled transport by road.

The task

The closest objective of the Customer is to stop gas flaring; the plan was to contribute Associated petroleum gas to the gas pipeline, bringing it up to spec by extracting the sales products.

After scrutinizing the options we came forward with a process that would enable the Customer to effectively produce natural gas liquids (NGL) with a high extraction rate. NGL could later be fractioned to get the end products.

The composition of the associated petroleum gas treating facility

The battery limit for the plant consists of the following:

  • Feed gas compression skid
  • Dew point control skid with de-ethanizer column
  • De-butanizer column
  • Ethylene glycol regeneration skid
  • Propane chiller skid

End products

  • Dry stripped gas in accordance with СТО 089-2010 specification
  • LPG (compliant with ГОСТ 20448-90 specs)
  • Stabilized gas condensate with saturated vapor pressure up to 500 mm HG.

Economics

Key figures

2013

2014

2015

2016

2017

2018

2019

2020

Crude production, mln t/year

0,68

0,738

0,844

0,802

0,787

0,62

0,455

0,407

Associated petroleum gas production, mln scm/year

102,332

111,012

126,963

120,694

118,389

93,255

68,382

61,27

Associated petroleum gas production, t/year

108 472

117 672

134 581

127 935

125 493

98 851

72 485

64 947

Dry stripped gas, mln scm/year

87

94

107

102

100

79

58

52

Dry stripped gas, t/year

74 490

80 808

92 420

87 856

86 179

67 883

49 777

44 600

С3/С4, t/year

31 145

29 447

33 679

32 016

31 404

24 737

18 139

16 253

С5+ , t/year

6 837

7 417

8 482

8 063

7 909

6 230

4 569

4 093

 

Indices

Figures

2013

2014

2015

2016

2017

2018

2019

2020

Dry stripped gas, mln scm/year

(30$/1000 scm)

2 598 502

 2 818 895

3 223 960

3 064 751

3 006 238

2 368 016

1 736 407

1 555 826

С3/С4, t/year

(350 $/t)

9 500 754

10 306 565

11 787 581

11 205 473

10 991 535

8 658 041

6 348 724

5 688 479

С5+ t/year

(500 $/t)

3 418 342

3 708 270

4 241 135

4 031 694

3 954 720

3 115 136

2 284 251

2 046 697

Total revenue

($/год)

15 517 598

16 835 744

19 254 692

18 303 934

17 954 510

14 143 212

10 371 401

9 293 022

OPEX

1 080 000

1 134 000

1 190 700

1 250 235

1 312 747

1 378 384

1 447 303

 1 519 668

EBITDA

14 437 598

15 701 744

18 063 992

17 053 699

16 641 763

12 764 828

8 924 098

7 773 354

САРЕХ

Process equipment

21 700 000

Supporting infrastructure

6 510 000

Construction and installation

7 595 000

Total

35 805 000

Return of investment (payback) period, months:

27