Rheology and Transport in Porous Media of New Water Shutoff / Conformance 
Control Microgels

Rousseau, David; Chauveteau, G.; Renard, Maurice; Tobary, R.; Zaitoun, Alain; Mallo, P.; Braun, Olivier; Omari, Abdelaziz

doi:10.2523/93254-ms

Cited by 38 publications

(24 citation statements)

References 22 publications

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“…Zaitoun et al insisted that relatively large microgel size results in low amount of microgel penetration of low-permeability zones [22]. Several authors suggested and explained the disproportionate permeability reduction (DPR) effects or sometimes called relative permeability modification (RPM) effects [11,[23][24][25][26]. According to DPR, it reduces relative water permeability dominantly rather than relative oil permeability, even if gel solution penetrates both low-and highpermeability zones.…”

Section: Basic Theoriesmentioning

confidence: 99%

Performance of Gel Treatments in Reservoirs with Multiscale Heterogeneity

Lee

2013

Journal of Chemistry

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Spatially correlated permeability fields are usually generated by single-scale correlation. To overcome the limitations of single-scale permeability fields in describing real situation, permeability fields should be generated by multiscale correlation. Multiscale heterogeneity results in the existence of various permeability magnitudes and spatial distributions of permeability. Gel treatment is applied on the heterogeneous permeability fields realized by multiscale correlation. Performance of gel treatment has been shown to depend on permeability distribution and permeability values, which are determined by correlation length, variance, and number of scales. Generally, spatially-correlated permeability fields generated with longer correlation length, higher variance, and multiscale lead to higher improvement in the performance of gel treatment. In addition, longer application of preflush as waterflooding results in larger reduction of water-oil ratio when the gel treatment is applied to heterogeneous permeability fields after preflush.

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Section: Basic Theoriesmentioning

confidence: 99%

Performance of Gel Treatments in Reservoirs with Multiscale Heterogeneity

Lee

2013

Journal of Chemistry

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“…If gelation is stopped sufficiently early or if gels are sufficiently sheared so that gel particles remain significantly smaller than pore throats, the gel suspensions can propagate through porous rock; however, the level of mobility reduction (residual resistance factor) is generally small (less than 2). 16 Independent studies at several locations (the University of Kansas, 125,126,155 the University of TX, 124 New Mexico Tech, 156,157 Stavanger College, 128 and BP 127 ) confirm that aluminum-citrate-HPAM gelants and gels behave like other gelants and gels.…”

Section: Are Colloidal Dispersion Gels Reallymentioning

confidence: 99%

“…The lowest F rro value was 1.2. We found five cases where gels provided water residual resistance factors greater than 2,100 and ultimate F rro values of 2 or less (see Entries 7,8,10,11,and 16 in Tables 1 and 2). These cases used gels with 0.3% to 0.5% HPAM.…”

Section: Permeability To Oil After Gel Placementmentioning

confidence: 99%

“…For adsorbed polymers and suspensions of gel particles, resistance factors (F r , apparent viscosities in porous media relative to brine) and residual resistance factors (F rr , permeability reduction values) increase with decreasing permeability. [14][15][16][18][19][20][21][169][170][171] In other words, these materials reduce the flow capacity of low-permeability rock by a greater factor than high-permeability rock. Depending on the magnitude of this effect, these polymers and gels can harm injection or production flow profiles in wells, even though the polymer or gelant penetrates significantly farther into the high-permeability rock.…”

Section: How Is Vertical Sweep Affected When Resistance Factors Vary mentioning

confidence: 99%

“…12,14,[120][121][122][123] Alternatively, if gelation is stopped sufficiently early or if gels are sufficiently sheared so that gel particles remain significantly smaller than pore throats, the gel suspensions can propagate through porous rock; however, the level of mobility reduction is generally small (less than 2). 16 Also, suspensions of gel particles and adsorbed polymers provide resistance factors and residual resistance factors that increase with decreasing permeability. 14,15,[18][19][20][21] Not surprisingly, suspensions of small gel particles are more effective at restricting flow through small pores than through large pores.…”

Section: Are Gel Treatments Needed?mentioning

confidence: 99%

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Aperture-Tolerant, Chemical-Based Methods to Reduce Channeling

Seright¹

2007

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DEDICATIONThis report is dedicated to Dr. Jerry Casteel, who recently retired after many years of government service. During his time with the DOE's National Petroleum Technology Office, Jerry consistently played an extremely constructive part in overseeing our research. While our government is often criticized for wasteful spending and flighty funding of ill-considered projects, Jerry was a great role model, illustrating the very best of our public servants. Being highly competent (both technically and managerially), he provided a voice of moderation and charted a steady long-term course for solving some of the nation's most difficult energy problems. We will miss his insights, his vision, his dedication to advancing petroleum engineering, and his friendship.iii ABSTRACT This final technical progress report describes work performed from October 1, 2004, through May 16, 2007, for the project, "Aperture-Tolerant, Chemical-Based Methods to Reduce Channeling."We explored the potential of pore-filling gels for reducing excess water production from both fractured and unfractured production wells. Several gel formulations were identified that met the requirements-i.e., providing water residual resistance factors greater than 2,000 and ultimate oil residual resistance factors (F rro ) of 2 or less. Significant oil throughput was required to achieve low F rro values, suggesting that gelant penetration into porous rock must be small (a few feet or less) for existing pore-filling gels to provide effective disproportionate permeability reduction. Compared with adsorbed polymers and weak gels, strong pore-filling gels can provide greater reliability and behavior that is insensitive to the initial rock permeability.Guidance is provided on where relative-permeabiliy-modification/disproportionate-permeabilityreduction treatments can be successfully applied for use in either oil or gas production wells. When properly designed and executed, these treatments can be successfully applied to a limited range of oilfield excessive-water-production problems.We examined whether gel rheology can explain behavior during extrusion through fractures. The rheology behavior of the gels tested showed a strong parallel to the results obtained from previous gel extrusion experiments. However, for a given aperture (fracture width or plate-plate separation), the pressure gradients measured during the gel extrusion experiments were much higher than anticipated from rheology measurements. Extensive experiments established that wall slip and first normal stress difference were not responsible for the pressure gradient discrepancy. To explain the discrepancy, we noted that the aperture for gel flow (for mobile gel wormholing through concentrated immobile gel within the fracture) was much narrower than the width of the fracture.The potential of various approaches were investigated for improving sweep in parts of the Daqing Oil Field that have been EOR targets. Possibilities included (1) gel treatments that are directed at channeling through fractures,...

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Study of a Novel Self-Thickening Polymer for Improved Oil Recovery

You

Wang

Tang³

et al. 2015

Ind. Eng. Chem. Res.

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The utilization of self-thickening polymer (STP) in conformance control was first investigated. Results show that these STP solutions exhibit an increase in viscosity (even like gel) under certain conditions. The optimized application conditions of this novel STP are as follows: mass concentration, 0.25−0.30 wt %; salinity, 4.0−8.0 wt %; and temperature range, 40−70°C. Environmental scanning images demonstrate that a clear and solid skeleton network structure is formed and the higher the salinity of the brine, the more compact the three-dimensional (3D) network structure. In addition, in-depth flow diversion and water permeability reduction were the main mechanisms of water shut-off treatment for improved oil recovery in oil displacement experiments. Finally, this novel STP with the ability to create a gel-like system is cost-competitive, simpler to apply, and more environmentally friendly than the current polymer−cross-linker system. It provides an alternative candidate for conformance control treatments at injection or production wells.

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Rheology and Transport in Porous Media of New Water Shutoff / Conformance Control Microgels

Cited by 38 publications

References 22 publications

Performance of Gel Treatments in Reservoirs with Multiscale Heterogeneity

Performance of Gel Treatments in Reservoirs with Multiscale Heterogeneity

Aperture-Tolerant, Chemical-Based Methods to Reduce Channeling

Study of a Novel Self-Thickening Polymer for Improved Oil Recovery

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