An energy harvesting alternative to wellhead gas chokes

Albertus Retnanto, Mohamed Idris

Research output: Contribution to journalConference article

Abstract

Current practices utilize chokes in the wellhead to induce a pressure drop in high production gas wells to produce at a constant rate. Consequently, in this setup, the potential for this pressure to be made useful is lost. In contrast, the use of a turbo-expander could induce this same necessary pressure drop while simultaneously utilizing it to generate energy. To estimate the potential benefits of this modified system, some assessments were made. All tests conducted in this investigation utilized the thermodynamic property tables of pure methane to model the performance of produced reservoir gases. The first test conducted attempted to model the amount of mechanical energy lost across a typical choke at varying pressure ratios and flow rates. The second test modelled the theoretical energy that could be harvested across a turbo-expander. Using the relationships deduced between pressure ratio and power generated across a turbo-expander an equation relating the two parameters was derived. This equation was then applied to a case study representing a high producing gas well in the Middle East region to appraise the effectiveness of turbo-expander use on wells of this caliber. Reservoir parameters were estimated based upon parameters typically found in the region and were then used to create a production forecast for one well. The results of this case study indicate that expansion use in gas wells with production rates of roughly 100 MMSCFD/well show an average power generation of 2.2 MW/D/well in a five-year span towards the middle of the plateau production region. Over an entire production plateau and at some different wells, the power generation benefits of turbo-expander use could greatly improve the energy efficiency of gas production wells.

Original languageEnglish
Pages (from-to)1290-1300
Number of pages11
JournalProceedings of the International Conference on Industrial Engineering and Operations Management
Volume2019
Issue numberMAR
Publication statusPublished - 1 Jan 2019
Event9th International Conference on Industrial Engineering and Operations Management, IEOM 2019 - Bangkok, Thailand
Duration: 5 Mar 20197 Mar 2019

Fingerprint

Electric inductors
Wellheads
Energy harvesting
Gases
Pressure drop
Power generation
Energy efficiency
Energy
Gas
Methane
Thermodynamic properties
Flow rate

Keywords

  • Energy alternative
  • Gas wells
  • Power generation
  • Turbo-expander
  • Wellhead choke

ASJC Scopus subject areas

  • Strategy and Management
  • Management Science and Operations Research
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

Cite this

An energy harvesting alternative to wellhead gas chokes. / Retnanto, Albertus; Idris, Mohamed.

In: Proceedings of the International Conference on Industrial Engineering and Operations Management, Vol. 2019, No. MAR, 01.01.2019, p. 1290-1300.

Research output: Contribution to journalConference article

@article{b6e48d6ffe124926918e4b1e5ab17fba,
title = "An energy harvesting alternative to wellhead gas chokes",
abstract = "Current practices utilize chokes in the wellhead to induce a pressure drop in high production gas wells to produce at a constant rate. Consequently, in this setup, the potential for this pressure to be made useful is lost. In contrast, the use of a turbo-expander could induce this same necessary pressure drop while simultaneously utilizing it to generate energy. To estimate the potential benefits of this modified system, some assessments were made. All tests conducted in this investigation utilized the thermodynamic property tables of pure methane to model the performance of produced reservoir gases. The first test conducted attempted to model the amount of mechanical energy lost across a typical choke at varying pressure ratios and flow rates. The second test modelled the theoretical energy that could be harvested across a turbo-expander. Using the relationships deduced between pressure ratio and power generated across a turbo-expander an equation relating the two parameters was derived. This equation was then applied to a case study representing a high producing gas well in the Middle East region to appraise the effectiveness of turbo-expander use on wells of this caliber. Reservoir parameters were estimated based upon parameters typically found in the region and were then used to create a production forecast for one well. The results of this case study indicate that expansion use in gas wells with production rates of roughly 100 MMSCFD/well show an average power generation of 2.2 MW/D/well in a five-year span towards the middle of the plateau production region. Over an entire production plateau and at some different wells, the power generation benefits of turbo-expander use could greatly improve the energy efficiency of gas production wells.",
keywords = "Energy alternative, Gas wells, Power generation, Turbo-expander, Wellhead choke",
author = "Albertus Retnanto and Mohamed Idris",
year = "2019",
month = "1",
day = "1",
language = "English",
volume = "2019",
pages = "1290--1300",
journal = "Proceedings of the International Conference on Industrial Engineering and Operations Management",
issn = "2169-8767",
number = "MAR",

}

TY - JOUR

T1 - An energy harvesting alternative to wellhead gas chokes

AU - Retnanto, Albertus

AU - Idris, Mohamed

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Current practices utilize chokes in the wellhead to induce a pressure drop in high production gas wells to produce at a constant rate. Consequently, in this setup, the potential for this pressure to be made useful is lost. In contrast, the use of a turbo-expander could induce this same necessary pressure drop while simultaneously utilizing it to generate energy. To estimate the potential benefits of this modified system, some assessments were made. All tests conducted in this investigation utilized the thermodynamic property tables of pure methane to model the performance of produced reservoir gases. The first test conducted attempted to model the amount of mechanical energy lost across a typical choke at varying pressure ratios and flow rates. The second test modelled the theoretical energy that could be harvested across a turbo-expander. Using the relationships deduced between pressure ratio and power generated across a turbo-expander an equation relating the two parameters was derived. This equation was then applied to a case study representing a high producing gas well in the Middle East region to appraise the effectiveness of turbo-expander use on wells of this caliber. Reservoir parameters were estimated based upon parameters typically found in the region and were then used to create a production forecast for one well. The results of this case study indicate that expansion use in gas wells with production rates of roughly 100 MMSCFD/well show an average power generation of 2.2 MW/D/well in a five-year span towards the middle of the plateau production region. Over an entire production plateau and at some different wells, the power generation benefits of turbo-expander use could greatly improve the energy efficiency of gas production wells.

AB - Current practices utilize chokes in the wellhead to induce a pressure drop in high production gas wells to produce at a constant rate. Consequently, in this setup, the potential for this pressure to be made useful is lost. In contrast, the use of a turbo-expander could induce this same necessary pressure drop while simultaneously utilizing it to generate energy. To estimate the potential benefits of this modified system, some assessments were made. All tests conducted in this investigation utilized the thermodynamic property tables of pure methane to model the performance of produced reservoir gases. The first test conducted attempted to model the amount of mechanical energy lost across a typical choke at varying pressure ratios and flow rates. The second test modelled the theoretical energy that could be harvested across a turbo-expander. Using the relationships deduced between pressure ratio and power generated across a turbo-expander an equation relating the two parameters was derived. This equation was then applied to a case study representing a high producing gas well in the Middle East region to appraise the effectiveness of turbo-expander use on wells of this caliber. Reservoir parameters were estimated based upon parameters typically found in the region and were then used to create a production forecast for one well. The results of this case study indicate that expansion use in gas wells with production rates of roughly 100 MMSCFD/well show an average power generation of 2.2 MW/D/well in a five-year span towards the middle of the plateau production region. Over an entire production plateau and at some different wells, the power generation benefits of turbo-expander use could greatly improve the energy efficiency of gas production wells.

KW - Energy alternative

KW - Gas wells

KW - Power generation

KW - Turbo-expander

KW - Wellhead choke

UR - http://www.scopus.com/inward/record.url?scp=85067246910&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85067246910&partnerID=8YFLogxK

M3 - Conference article

VL - 2019

SP - 1290

EP - 1300

JO - Proceedings of the International Conference on Industrial Engineering and Operations Management

JF - Proceedings of the International Conference on Industrial Engineering and Operations Management

SN - 2169-8767

IS - MAR

ER -