Summary of ASP Pilots in Daqing Oil Field

Wang, Demin; Cheng, Jiecheng; Wu, Jianhua; Yang, Zhenyu; Yao, Yuming

doi:10.2523/57288-ms

Cited by 8 publications

(4 citation statements)

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“…The database was built using the data from The Oil and Gas Journal [14-17] and SPE publications [18][19][20][21]. Then it was eventually presented as updated screening criteria by Al Adasani & Bai [22].…”

Section: Revision Of Workover Operations and Selection Of Eor Methodsmentioning

confidence: 99%

Improvement of oil recovery factor from geological perspectives

Chudinova¹,

Urakov²,

Sultanov³

et al. 2021

SOCAR Proceedings

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At a late stage of development of any oilfield, there are big number of factors that affect recovery factor. One of them is related to presence of isolated zones, that were caused by combination of poor reservoir and oil properties of a rock. To solve the given problem variety of workover operations and enhance oil recovery (EOR) methods can be appled for the complex reservoirs such as Tevlinsko-Russinskoe oilfield. The number of particular studies were presented by reviewing of field data, construction of heterogeneity zones, revision of workover operations and selection of EOR methods. It has obtained that the reservoir has the lenticular structure, consists from 9 different facies and presented by 4 classes of heterogeneity. The immiscible gas injections of Nitrogen were selected as the most suitable EOR method for the given oilfield. Application of different composition of brine water was reccomended for wettability alteration.

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Section: Revision Of Workover Operations and Selection Of Eor Methodsmentioning

confidence: 99%

Improvement of oil recovery factor from geological perspectives

Chudinova¹,

Urakov²,

Sultanov³

et al. 2021

SOCAR Proceedings

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“…However, at the present time Daqing Field represents one of the largest, if not the largest, ASP flood implemented as of today. ASP flooding has been studied and tested in Daqing for more than 15 years though several pilots of different scales [96,[117][118][119][120]. Gudong [121], Karamay [122,123], Liahoe and Shengli [96] fields are other examples of Chinese ASP projects documented in the literature.…”

Section: Chemical Methodsmentioning

confidence: 99%

Enhanced Oil Recovery: An Update Review

2010

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With the decline in oil discoveries during the last decades it is believed that EOR technologies will play a key role to meet the energy demand in years to come. This paper presents a comprehensive review of EOR status and opportunities to increase final recovery factors in reservoirs ranging from extra heavy oil to gas condensate. Specifically, the paper discusses EOR status and opportunities organized by reservoir lithology (sandstone and carbonates formations and turbiditic reservoirs to a lesser extent) and offshore and onshore fields. Risk and rewards of EOR methods including growing trends in recent years such as CO 2 injection, high pressure air injection (HPAI) and chemical flooding are addressed including a brief overview of CO 2 -EOR project economics.

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“…In combined chemical flooding, defined as flooding with an alkali, SF, and a polymer, this increase is greater than 20%. Successful operation of the pilot chemical flooding unit at Daqing field provided a new method of development [1].Crude oil is rarely recovered alone; it is frequently mixed with water, which can create emulsions. These emulsions can be treated to remove dispersed water and associated inorganic salts to satisfy the requirements for transport, storage, and exportation of the crude and to reduce corrosion of equipment and poisoning of catalysts in refining it.…”

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confidence: 99%

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Demulsifier for separation of liquid obtained in chemical flooding of oil layers

Zhang

Ouyang

Zhang

et al. 2010

Chem Technol Fuels Oils

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The development and use of a demulsifier for separation of the fluid obtained after flooding of an oil layer using ASP (alkaline surfactant polymer) are described. The mechanism of separation of the emulsion was investigated. As a result of laboratory studies and tests in the field, it was shown that the demulsifier produces excellent results in separation of such emulsions.Flooding with SF is used to increase oil recovery on industrial scales at the end of the life of a field. Oil recovery increases by more than 12% of the initial oil reserves with this method of flooding in comparison to ordinary flooding. In combined chemical flooding, defined as flooding with an alkali, SF, and a polymer, this increase is greater than 20%. Successful operation of the pilot chemical flooding unit at Daqing field provided a new method of development [1].Crude oil is rarely recovered alone; it is frequently mixed with water, which can create emulsions. These emulsions can be treated to remove dispersed water and associated inorganic salts to satisfy the requirements for transport, storage, and exportation of the crude and to reduce corrosion of equipment and poisoning of catalysts in refining it. Chemical flooding emulsions have higher stability and more complex properties than the emulsions formed in ordinary flooding, which creates difficulties in conducting subsequent processes, in particular, in separating the crude and the water. The increase in the stability of the emulsion in chemical flooding is due to the following reasons:• the fluid obtained in chemical flooding contains reagents that displace crude oil: alkali, SF, and polymer. The studies showed that sodium hydroxide reacts with the fatty acids in the crude, forming soapy surface-active components [2] which accumulate on the oil"water interface, strengthening the interface, and thus significantly increasing the stability of the oil "water emulsion. SF, which significantly reduce the surface tension between the crude and the water [3], also increase the stability of the oil"water emulsion in moving to the surface of the 113 oil -water interface. The sterically and electrostatically stable polymer [4] accumulates on the oil -water interface and makes its own contribution to stabilization of the emulsion.• The content of asphaltenes, resins, and aromatic compounds is higher in crude recovered in chemical flooding than in ordinary flooding [5]. The contribution of asphaltenes and resins to strengthening of the oil -water interface is greater than for the other components of crude oil. Both asphaltenes and resins are found on the oil -waterr phase interface, strengthening it.• The structure of the emulsion is more complex [6]: it includes water -oil and oil -water emulsions and multiemulsions (water -oil -water, oil -water-oil, etc.).In operating the pilot chemical flooding unit, we found that: the polyester demulsifiers usually used for separating the fluid obtained after flooding are ineffective; the emulsion layer between crude and water is thicker than necessary; the...

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Summary of ASP Pilots in Daqing Oil Field

Cited by 8 publications

References 0 publications

Improvement of oil recovery factor from geological perspectives

Improvement of oil recovery factor from geological perspectives

Enhanced Oil Recovery: An Update Review

Demulsifier for separation of liquid obtained in chemical flooding of oil layers

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