A Flow Assurance Study on Elemental Sulfur Deposition in Sour Gas Wells

Deposition of solid elemental sulfur may arouse severe damage to the formation and significantly affect the gas deliverability in sour gas reservoirs. As one main measure of stimulation, hydraulic fracturing always ceases to work due to the sulfur deposition in the fractures. To have a better understanding of the failure of fracture conductivity caused by sulfur deposition and learn the degree of fracture conductivity improved by acidification, an experimental was implemented and studied. In this paper, both the sulfur powder and an artificial fractured core were employed to simulate the process of sulfur deposition in the fractures. A further step was made to inject some hydrochloric acid into the blocked fracture caused by sulfur powder. The result showed that the fracture conductivity could be greatly reduced by the sulfur deposition. The fracture conductivity can be decreased by 17%~47% due to sulfur deposition. However, to some degree, acid-fracturing can improve the conductivity of fracture by eroding the surface of fracture. This means the failure of fracture blocked by sulfur deposition can be improved by acidification.

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Application of aryl disulfides for the mitigation of sulfur deposition in sour gas wells

Energy & Fuels ◽

10.1021/ef00015a010 ◽

1989 ◽

Vol 3 (3) ◽

pp. 315-320 ◽

Cited By ~ 3

Author(s):

Peter D. Clark ◽

Kevin L. Lesage ◽

Pratibha Sarkar

Keyword(s):

Sulfur Deposition ◽

Gas Wells ◽

Sour Gas

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Advances in the Prediction and Management of Elemental Sulfur Deposition Associated with Sour Gas Production from Fractured Carbonate Reservoirs

10.2118/77332-ms ◽

2002 ◽

Cited By ~ 2

Author(s):

Nicholas Hands ◽

Bora Oz ◽

Bruce Roberts ◽

Paul Davis ◽

Mike Minchau

Keyword(s):

Elemental Sulfur ◽

Gas Production ◽

Carbonate Reservoirs ◽

Sulfur Deposition ◽

Fractured Carbonate ◽

Sour Gas

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Productivity Prediction of Horizontal Well with Sulfur Deposition in Sour Gas Reservoir

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.268-270.1207 ◽

2012 ◽

Vol 268-270 ◽

pp. 1207-1211

Author(s):

Jing Hong Hu ◽

Zhi Ping Li ◽

Lei Wang ◽

Ling Ye Meng ◽

Ju Hong Lu

Keyword(s):

Horizontal Well ◽

Elemental Sulfur ◽

Sulfur Deposition ◽

Gas Reservoir ◽

Reservoir Heterogeneity ◽

The Real ◽

Reservoir Development ◽

Initial Stage ◽

Productivity Prediction ◽

Sour Gas

With the development of sour gas reservoir, the utilization of horizontal well technology has a great significance. The accurate prediction of the productivity of horizontal well in developing sour gas reservoir will become more and more important. In this paper, productivity prediction formulas of the horizontal well are established with considering the effect of sulfur deposition on permeability. The effects of the length of horizontal well, the effective thickness of the reservoir, elemental sulfur deposition and reservoir heterogeneity on productivity can be analyzed by established formulas. According to the field case, the calculating results of improved Joshi’s equation approaches the real productivity, which means that it could be used to predict the productivity of horizontal well at initial stage during sour gas reservoir development. The results can be used as a reference for the development of similar sour gas reservoir.

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New Model to Predict Formation Damage due to Sulfur Deposition in Sour Gas Wells

10.2118/149535-ms ◽

2012 ◽

Cited By ~ 4

Author(s):

Mohamed Ahmednasreldin Mahmoud ◽

Abdulaziz A. Al-Majed

Keyword(s):

Formation Damage ◽

Sulfur Deposition ◽

Gas Wells ◽

New Model ◽

Sour Gas

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A Dynamic Workflow of Well Health Issue Prediction – Sulfur Deposition

10.2523/iptc-21420-ms ◽

2021 ◽

Author(s):

Bashirul Haq

Keyword(s):

Material Balance ◽

Gas Production ◽

Health Issue ◽

Sulfur Deposition ◽

Gas Reservoirs ◽

Gas Field ◽

Actual Performance ◽

Sulphur Deposition ◽

Balance Analysis ◽

Sour Gas

Abstract Sour gas reservoirs are vital sources for natural gas production. Sulphur deposition in the reservoir reduces a considerable amount of gas production due to permeability reduction. Consequently, well health monitoring and early prediction of Sulphur deposition are crucial for effective gas production from a sour gas reservoir. Dynamic gas material balance analysis is a useful technique in calculating gas initially in place utilizing the flowing wellhead or bottom hole pressures and rates during the well's lifetime. The approach did not apply to monitor a producing gas's health well and detect Sulphur deposition. This work aims to (i) modify dynamic gas material balance equation by adding the Sulphur deposition term, (ii) build a model to predict and validate the issue utilizing the modified equation. A unique form of the flowing material balance is developed by including Sulphur residue term. The curve fitting tool and modified flowing gas material balance are applied to predict well-expected behaviour. The variation between expected and actual performance indicates the health issue of a well. Initial, individual components of the model are tested. Then the model is validated with the known values. The workflow is applied to active gas field and correctly detected the health issue. The novel workflow can accurately predict Sulphur evidence. Besides,the workflow can notify the production engineers to take corrective measures about the subject. Keywords: Sulfur deposition, Dynamic gas material balance analysis, Workflow

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