Polymer adsorption at the brine/rock interface: the role of electrostatic interactions and wettability

Chiappa, Luisa; Mennella, A.; Lockhart, Thomas P.; Burrafato, Giovanni

doi:10.1016/s0920-4105(99)00035-2

Cited by 75 publications

(68 citation statements)

References 12 publications

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“…A series of indications have been obtained from the laboratory activities and are fully reported elsewhere [7][8][9][10] . In this contest the main subjects that have been investigated can be pointed out as:…”

Section: Case Historiesmentioning

confidence: 99%

Rigless WSO Treatments in Gas Fields. Bullheading Gels and Polymers in Shaly Sands: Italian Case Histories

et al. 1999

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractGels are used worldwide to control water co-production in gas and oil wells (WSO treatments) but the criticality of a correct placement in the Italian scenario had strongly limited their use in this Country. For instance, in gravel packed wells or in wells where the "ID casing/ID tubing" ratio is over 2.5, inflatable packers cannot be efficiently used for gel diversion; moreover, dual injection has to be usually applied with these tools, making a treatment very often too expensive and, as a result, unacceptable.A review of water problems and displacement data collected during past matrix treatments performed in Italian gas fields led to the study of possible alternatives for treatments to be performed using standard crosslinked polymer and unusual displacement techniques. Relative Permeability Modifier (RPM) polymers were also considered and lab tested for WSO in shaly sands because the use of gels is still considered too risky. In fact, most of the treatments performed in Italy have to be performed bullheading in order to reduce the cost of the operations, making WSO treatments more attractive.In this paper a brief summary of laboratory activities for a correct selection of polymers and gels, suitable for shaly, low permeability sands are reported as well as field treatments data and results.Bullheading technique seems to be the only cost-effective and field proven placement method for rigless WSO treatments to produce marginal gas reserves from shaly, depleted, low temperature, multilayered reservoirs.

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Section: Case Historiesmentioning

confidence: 99%

Rigless WSO Treatments in Gas Fields. Bullheading Gels and Polymers in Shaly Sands: Italian Case Histories

et al. 1999

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“…In particular, electrostatic interactions play a crucial role in the adsorption process, as they can be attractive or repulsive 20,21 . In particular, electrostatic interactions play a crucial role in the adsorption process, as they can be attractive or repulsive 20,21 .…”

Section: Physical-chemical Mechanismsmentioning

confidence: 99%

Candidate and Chemical Selection Rules for Water Shutoff Polymer Treatments

Mennella¹,

Chiappa²,

Lockhart³

et al. 1999

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractWater shutoff treatments with polymers that selectively reduce the water permeability can be effective to reduce water production from hydrocarbon wells that cannot be treated with conventional approaches. In this paper we present an analysis that starts from the principal operative questions and defines the main physical-chemical issues to be understood in order to develop a reliable technology. These issues are discussed by showing results from a number of experimental and simulation studies conducted in our laboratories with the goal to link the understanding of basic mechanisms to the development of operational rules. This work shows the elaboration of understanding-based rules for candidate and chemical selection to be an effective strategy for the application of this technology in the field.

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“…This may be due to the influence of rock wettability on polymer adsorption, which leads to the reduction in the interaction between the polymer and mixed-wet rock surface. It means that if the adsorption of oil on the surface of a rock does take place, then the polymer has a limited area for interaction with the rock and a better propagation of polymers in the mixed wet porous media is observed (Sorbie 1991;Broesta et al 1995;Chiappa et al 1999). Shiran and Skauge (2015) carried out experiments with nano-sized polymer particles (linked polymer solution, LPS) under different wettability conditions.…”

Section: Introductionmentioning

confidence: 99%

Oil Recovery from Outcrop Cores with Polymeric Nano-Spheres

et al. 2016

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In order to improve oil recovery from water flooded heterogeneous oil reservoirs, different chemical enhanced oil recovery (cEOR) technologies can be applied. One of the recently developed cEOR technologies for the improvement of oil recovery is based on prefabricated polymeric nano-spheres. These spheres are able to swell over time through absorption of brine. Literature review on the flow of the nano-spheres in porous media showed that the mechanism of oil displacement from heterogeneous as well as homogenous porous media is not well established. One of the proposed mechanisms is that prefabricated polymeric particles might reduce the residual oil saturation S or (Goudarzi et al. 2014).To validate this, a series of core flood experiments was carried out in order to study this mechanism in both a heterogeneous Boise outcrop and homogeneous Bentheimer outcrop. Saturation of the cores with highly viscous crude oil was done at 50˚C using the porous plates method. After the oil saturated core was water flooded at 1 ft/day, a bump flood was performed. It helped to achieve the residual oil saturation in the core. Subsequently, several slugs of the nano-spheres were injected into the core in order to study the influence of the nano-spheres on the residual oil saturation. In addition to that, the propagation of the nano-spheres in the core was studied via a pressure drop measurement at different sections of the core and by effluent collection.The results of the experiments show that the oil displacement from a core with nano-spheres after a bump flood is marginal. Some oil extraction with nano-spheres might have happened due to restricting the flow in the highly permeable zones of the core. The subsequent injection of water could potentially result in improved microscopic sweep efficiency and increased oil production. However, in our experiments this effect was not significant. Our results do not show that nano-spheres significantly reduce the residual oil saturation of the core. Additional measurements showed that the nano-spheres are mostly retained in the inlet section of the core and the propagation of the nano-spheres in porous media is slow. Therefore, the effect of the extra oil recovery is likely limited to the inlet section of the core.There is currently limited description in the literature on the oil recovery mechanism by polymeric nano-spheres. It has a large impact on how the behaviour of the nano-spheres in porous media needs to be modelled and on the screening of candidate reservoirs for the conditions described in the experiments. In our experiments we have seen no significant reduction of residual oil saturation and slow propagation.Further work is required to evaluate the conditions under which the performance of the nano-spheres can be improved.

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Polymer adsorption at the brine/rock interface: the role of electrostatic interactions and wettability

Cited by 75 publications

References 12 publications

Rigless WSO Treatments in Gas Fields. Bullheading Gels and Polymers in Shaly Sands: Italian Case Histories

Rigless WSO Treatments in Gas Fields. Bullheading Gels and Polymers in Shaly Sands: Italian Case Histories

Candidate and Chemical Selection Rules for Water Shutoff Polymer Treatments

Oil Recovery from Outcrop Cores with Polymeric Nano-Spheres

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