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Oilfield Chemistry

The growth in deepwater production is apparent to anyone who works even vaguely close to this section of the industry. Deepwater production continues to increase and is an important part of oil growth up to and beyond 2030, when it may be as high as 12 million–13 million BOPD. Deepwater production is fueled by the Golden Triangle of Brazil, the Gulf of Mexico, and West Africa.

One of the more technologically challenging production-chemistry applications in deep water is the control of gas hydrates. Hydrates are a high-pressure/low-temperature phenomenon where, under the correct conditions, produced gas will complex with water and form catastrophic ice-like blockages in subsea infrastructure. Deepwater subsea flowlines offer an almost perfect hydrate-formation environment, and control measures must be taken.

Several methods exist for hydrate control, and they can be classified broadly into mechanical (e.g., insulation, hot-oil circulation) or chemical solutions. The chemistry can be divided into thermodynamic inhibitors (e.g., alcohols, glycols) and low-dose hydrate inhibitors (LDHIs). Antiagglomerates, or AAs, are a major class of LDHI and are exclusively used in deepwater environments because of the severe hydrate-formation conditions (or subcooling) that can exist.

The early commercial use of AA chemistry in the oil field goes back as far as the 1990s. Since then, many advancements have been made and reported in the scientific, academic, and patent literature. In recent years, advancements have occurred at a tremendous rate, which is in line with the almost exponential growth in deepwater activity. The featured papers and recommended additional reading summarize the state of the art for LDHI AA research and development and have been selected to give readers a broad indication from both academia and industry around the world.

This Month's Technical Papers

Benefits of Low-Dosage Hydrate Inhibitors

Locally Sourced, Ecofriendly Hydrate Inhibitor Effective in Simulated Offshore Environment

Study Evaluates Hydrate Antiagglomerants

Recommended Additional Reading

OTC 29660 Biodegradable Antiagglomerant Chemistry for Hydrate-Plug Prevention in Various Production Conditions by Deepak Steven Monteiro, Halliburton, et al.

OTC 28935 Early Project Low-Dose Hydrate-Inhibitor Dosage Assumptions vs.  an Extensive Laboratory Study by P. Conrad, Assured Flow Solutions, et al.

BHR 2018 143 Measurements of Dispersant Additive on Hydrate/Ice Slurry Transport by A. Melchuna, Colorado School of Mines, et al.

Jonathan Wylde, SPE, is the head of global innovation at Clariant Oil Services in Houston and an honorary associate professor at Heriot-Watt University. He holds a BS degree in geology and a PhD degree in physical chemistry from the University of Bristol, UK. Wylde is the author of more than 150 papers and holds several patents. He serves on the JPT Editorial Committee and on committees for the SPE International Conference and Exhibition on Oilfield Scale, the SPE International Symposium on Oilfield Chemistry, and the SPE Annual Technical Conference and Exhibition. Wylde is also a technical editor for SPE Production & Operations and SPE Journal. He can be reached at jonathan.wylde@clariant.com.

Oilfield Chemistry

Jonathan Wylde, SPE, Head of Global Innovation, Clariant Oil Services

01 September 2019

Volume: 71 | Issue: 9

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