Advances in Polymer Flooding and Alkaline/Surfactant/Polymer Processes as Developed and Applied in the People’s Republic of China

Chang, Harry L.; Zhang, Z.Q.; Wang, Q.M.; Xu, Z.S.; Guo, Zhidong; Sun, H.Q.; Cao, X.L.; Qiao, Q.

doi:10.2118/89175-ms

Cited by 53 publications

(63 citation statements)

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“…Additional work may be warranted concerning the potential of foams and polymer solutions prepared with reduced salinity. 154 summarized some of the pilot and commercial-scale field activities on polymer flooding and ASP flooding that were performed in China. Unquestionably, polymer flooding and ASP flooding can be effective oil-recovery processes and have great potential.…”

Section: Discussionmentioning

confidence: 99%

“…[116][117][118]154 Specifically, they suggested that these CDG formulations penetrate deep into porous matrix reservoir rock and subsequently provide higher resistance factors (effective viscosities in porous media) and residual resistance factors (permeability reduction factors) than comparable HPAM polymer solutions without crosslinker. Because Chang's paper was published in the "SPE Distinguished Author Series," the Society of Petroleum Engineers may be perceived as endorsing colloidal dispersion gels as an accepted, state-of-the-art, better-than-polymer-flooding technology.…”

Section: Are Colloidal Dispersion Gels Reallymentioning

confidence: 99%

“…Thus, if the CDG claim of Ref. 154 was true (that CDG gels provide higher resistance factors and residual resistance factors than polymer alone), CDG gels could actually harm sweep efficiency.…”

Section: Are Colloidal Dispersion Gels Reallymentioning

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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Section: Discussionmentioning

confidence: 99%

Section: Are Colloidal Dispersion Gels Reallymentioning

confidence: 99%

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Aperture-Tolerant, Chemical-Based Methods to Reduce Channeling

Seright¹

2007

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“…However, chemical EOR projects have made a relatively small contribution to the world's oil production during the last decades (Alvarado and Manrique 2010). Especially, China is the country with the largest oil production resulting from chemical EOR projects (Chang et al 2006;Gu et al 1998;Hongyan et al 2009;Pu 2009). …”

Section: Introductionmentioning

confidence: 99%

A pilot numerical simulation case study for chemical EOR feasibility evaluation

Chen

Feng

Wú

et al. 2015

J Petrol Explor Prod Technol

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Because of high oil price and technology advancement in recent years, chemical EOR is becoming an important option for maintaining sustainable efficient development for mature reservoirs in the future. In this paper, an integrated numerical simulation approach is adopted for Palouge oilfield in South Sudan for chemical EOR feasibility evaluation. The chemical EOR methods are preliminarily screened for the main oil-bearing zones, and the advantages and disadvantages for chemical flooding are analyzed by comparing technical parameter limits with oilfield parameters. Specifically, the pilot oil zone and areal position selection was determined using a comprehensive method, which is based on zonal injection plan and application experiences. Chemical EOR simulation is performed for sensitivity analysis and different scenarios prediction. Three technical indicators are employed to evaluate the EOR efficiency. Some key physiochemical factors with uncertainty are also analyzed in detail, and this will provide unusual useful information for comprehensive feasibility evaluation. The proposed technical evaluation procedure provides a helpful guidance for chemical EOR feasibility assessment in other analogous reservoirs.

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“…In some oilfields in China, polymer flood can enhance oil recovery up to nearly 14% of the original oil in place [1]. In spite of the remarkable performance of polymers, there are still substantial amount of reserves, nearly half of original oil in place, in porous media after polymer flood [2].…”

Section: Introductionmentioning

confidence: 99%

Study on the Impact of Polymer Retention in Porous Media on Further Surfactant-Polymer Flood

Li¹,

Jiang²,

Yu³

et al. 2015

TOPEJ

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Polymer flood gains expansive popularity as a promising EOR method in various oilfields worldwide. However, there are still substantial amount of resources underground after polymer application. To further enhance oil recovery, secondary chemicals are sometimes utilized to sweep the remaining hydrocarbons to maintain the consistent development of oilfields. In this paper, a series of experiments are established and conducted to explore the feasibility of surfactant/polymer flooding applied to a polymer flooded reservoir, and also the influence of polymer retention in porous media to enhance the oil recovery performance of subsequent chemical drive. The data of the experiments suggest that surfactant/polymer flooding owns a very good potential as a subsequent EOR technique, and that polymer retention in pores helps block underground water channels, improving greatly the sweeping efficiency of secondary chemical flood.

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Advances in Polymer Flooding and Alkaline/Surfactant/Polymer Processes as Developed and Applied in the People’s Republic of China

Cited by 53 publications

References 0 publications

Aperture-Tolerant, Chemical-Based Methods to Reduce Channeling

Aperture-Tolerant, Chemical-Based Methods to Reduce Channeling

A pilot numerical simulation case study for chemical EOR feasibility evaluation

Study on the Impact of Polymer Retention in Porous Media on Further Surfactant-Polymer Flood

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