Paper Instructions

Your assignment is to critically review one paper. You need to think independently and critically. I don’t want a summary of what is in the papers. Don’t copy or paraphrase the papers or conclusions in the papers. I will upload a file of the paper that you will review and I will also upload examples on how the review should look. Please don’t overcomplicate things. Make it easy to read.

Comment 1- This paper discussed many polymer interactions/reactions that occur in seawaters. However, I believe this paper is missing a critical component (to me) that may make its applicability to the field incomplete. There is no discussion on the effect of oil/polymer interactions. These polymers aren’t injected into saltwater-only reservoirs. Various crude types may interact with the polymers that were chosen. Crude oil has thousands of components in small amounts, and some of these components may interact with the polymer. They may catalyze the breakdown of the polymer, produce free radicals, decrease/increase hydrolysis, or affect adsorption in the reservoir in ways that the author did not consider. I believe the author only has half the story. The author showed superior polymer choices given the conditions of the experiment he chose but leaving out any discussion of crude oil/polymer interactions seems to me a large oversight.

Comment 2- I would think pressure effects on the polymers are important in real world application. Under reservoir conditions, the polymers that were determined as being superior to the rest (in viscosity retention, less adsorption, etc) may not be true in situ. I do not expect radical changes in the polymer reactivity itself under different pressures, but I would expect some effect to be realized. Changes in the crudes (shrinkage, dissolved gas) may have some effect on the polymers in reality, and those interactions rely on pressure.

Comment 3- I think an experiment worth consideration would be to test fewer polymers, and test them using several common crude types, pressures and temperature conditions. I think this would better approximate real-world conditions and be of more value to industry representatives.

 Comment 4- The author assumed that the inaccessible pore volume was constant for all polymers tested, and that may not be a valid assumption. ATBS, AA, and Acrylamide all have different substituents, which have different reactivities and sizes, and they may interact with the pore in different ways, creating more or less IPV. This could produce a noticeable difference in practice.

Comment 5- If the UV method of determining polymer concentration (table 7) was inaccurate, and the reason for its inaccuracy isn’t known, why include it in the results? If this is to be included, I think a reason (or hypothesis) for the effect should be included as well. The author alluded to the sand potentially causing an effect but did not elaborate on a mechanism.

Comment 6- The static adsorption test (fig 7) using the given sandstone is so specific that it may not be relevant for most reservoirs. Each reservoir rock type may be different enough to make these results have no bearing. I would like to see how static adsorption would change with given calcium concentrations in later work to tease out some of the effects. This would have broader applicability as well.

Comment 7 (overall)- I think this paper provides a lot of room to make several smaller experiments from the concepts I have noted above. I think it is a great benchtop experiment that should be built on in later studies to maximize practical applicability. Here are some experimental ideas:

 1. Test fewer polymers with several crude types across a range of temperatures/pressures

 2. Test reductions in pore volume caused by the 3 broad classes of polymers he tested (ATBS, AA, Acrylamide) to determine if IPV is actually the same

 3. Try to identify and characterize the substituents in crude oil that may react with polymer type and cause some effect (if an effect was determined to exist from exp 1)

4. How does calcium concentration affect adsorption of the polymers studied? This would be interesting to see across several rock types.

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