EP1939393A1 - Procédé durable pour la récupération de pétrole - Google Patents

Procédé durable pour la récupération de pétrole Download PDF

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Publication number
EP1939393A1
EP1939393A1 EP07254825A EP07254825A EP1939393A1 EP 1939393 A1 EP1939393 A1 EP 1939393A1 EP 07254825 A EP07254825 A EP 07254825A EP 07254825 A EP07254825 A EP 07254825A EP 1939393 A1 EP1939393 A1 EP 1939393A1
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EP
European Patent Office
Prior art keywords
petroleum
viscosity
oil
formation
reducing agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07254825A
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German (de)
English (en)
Inventor
Ivonete Pereira Gonzalez Da Silva
Maria Aparecida De Melo
Amaury De Azevedo Aguiar
Ana Paula Silva Conceicao De Santana
Andre Luis Mynssen Ferreira
Vivian Resende Prates
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Petroleo Brasileiro SA Petrobras
Original Assignee
Petroleo Brasileiro SA Petrobras
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Filing date
Publication date
Application filed by Petroleo Brasileiro SA Petrobras filed Critical Petroleo Brasileiro SA Petrobras
Publication of EP1939393A1 publication Critical patent/EP1939393A1/fr
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons

Definitions

  • the present invention refers to a sustainable method for increasing the recovery of petroleum from petroleum-bearing subterranean formations, particularly formations wherein petroleum is found as oil which is too viscous to flow or be pumped.
  • the present invention refers to a method of recovery (extraction) of petroleum from the original geological formation utilising injection of diesel and/or biodiesel oil through the injection well, reducing the viscosity of the petroleum, dissolving heavier and immobile petroleum fractions and traversing the reservoir acting through the sweeping and displacement effectiveness, increasing oil recovery and the proven reserve.
  • the model currently followed aims to maintain production and reserves through the discovery of new accumulations; although such approach has in general led to the discovery of new offshore accumulations, they are frequently found at great depths in increasingly-deep water and frequently in deposits wherein the oil found is of high viscosity.
  • EPR Enhanced Petroleum Recovery
  • United States patent US 6 279 653 discloses that the viscosity of heavy oils may be significantly reduced converting such oil into a stable microemulsion.
  • Such microemulsion is formed combining alkaline reagents with the oil and subjecting the same to ultrasonic energy. Said reduction in oil viscosity permits the oil to be pumped out of the well and it may then be conveyed for refining, however introducing extraneous substances into the environment of the geological formation, which same require to be removed from such oil 1 through particular procedures, in addition to the utilisation of ultrasound.
  • United States patent US 5 025 863 discloses a process for well stimulation (injection/production in the production well) wherein a slug of immiscible natural gas is injected into a formation through the production well. The well is then shut in for a given time ('soak period') for the gas to enter solution. The well is then put into production when petroleum is then produced together with the gas utilising conventional production equipment and techniques, however the fact of struggling with gas and injecting the same through the production well raises other questions in terms of safety and effectiveness of the procedure.
  • United States patent US 6 491 053 refers to a known manner of reducing the viscosity of heavy petroleum through admixing the same with a liquid component of lower density.
  • Said component may be petrol, kerosene or other components such as to better pump the oil.
  • the solvent added may be removed and recycled. This procedure is expensive and when crude petroleum requires pumping over long distances recirculation of the viscosity-reducing agent becomes complicated. This is a process to ensure flushing pipelines and lines, it is not a method for recovering petroleum which acts within the reservoir.
  • United States patent US 4 531 586 also discloses a process for cyclic stimulation of heavy oil production in a petroleum reservoir comprising injection (through the production well) into the reservoir of a liquid solvent such as diesel oil or a light petroleum and production of the oil/solvent admixture. This is a method of well stimulation, injection and production in the production well having a reduced scope, not being an enhanced petroleum recovery method.
  • United States patent US 3 127 934 refers to the injection of two slugs of solvents through the injection well.
  • the first slug comprises solvents of low molecular weight, specifically gases (C1 to C4) which as the author discloses dissolve the oil contacted effectively, however it has a great tendency to pass around the regions bearing oil creating preferential channels, that is to say the gases tend to seek regions of high permeability.
  • the second slug comprises solvents or other types of material which, in contact with water, polymerise forming a product blocking the region washed. This is a different concept, involving plugging regions of high permeability. In both cases referred to the use of gases involves very delicate situations in terms of operational and safety matters, and as to the materials which polymerise, these may also prevent some areas of interest in the formation being prevented from subjection to more efficient washing.
  • the degree of formation of such preferential channels is determined by several factors of which the most important is the ratio between viscosity of the petroleum to be recovered and viscosity of the fluid injected.
  • a manner of minimising formation of such preferential channels is to seek to more closely approximate the viscosities of the 'displacing' and 'displaced' (petroleum) fluids.
  • One option is the addition of polymeric additives to injection water (displacing phase) to increase the viscosity thereof.
  • the second option is to reduce the viscosity of the petroleum through the use of miscible fluids.
  • EPR Enhanced Petroleum Recovery
  • the present invention presents a method of Enhanced Petroleum Recovery combining general, economic, environmental and social effectiveness in order to increase the recovery factor of onshore or offshore fields, more precisely through the use of a miscible substance for use in reservoirs, having the objective of reducing viscosity and fluidifying the petroleum.
  • a miscible substance for use in reservoirs, having the objective of reducing viscosity and fluidifying the petroleum.
  • Such substance is selected from the group consisting of diesel oil or fractionated gas oil from petroleum, or even biodiesel, being similar and derived from plants, or light oil, which products may be utilised pure or with additives, in an isolated manner or together with other fluids or methods such as: steam, polymers, etc.
  • Such substances require to be highly-miscible with the oil contained in the geological formation wherein it is intended to act, injection being executed through the injection well and traversing the entire reservoir to the production well, which in the petroleum context represents Enhanced Petroleum Recovery (EPR).
  • EPR Enhanced Petroleum Recovery
  • solvent is understood to be biodiesel or oil, having characteristics similar to the diesel habitually produced from mineral sources, being produced however from renewable sources, normally agricultural sources.
  • the present invention refers to the use of solvents such as light liquid petroleum fractions, for example diesel oil or gas oil, a light petroleum, and essential oils derived from renewable sources such as, for example, biodiesel, used in a pure form or in a common admixture in any proportion for injection into a geological formation through the injection well, resulting in a final admixture (petroleum/injected solvent) having a much lower viscosity and much greater fluidity than that of the original petroleum, impacting on the entire petroleum production chain.
  • solvents such as light liquid petroleum fractions, for example diesel oil or gas oil, a light petroleum, and essential oils derived from renewable sources such as, for example, biodiesel, used in a pure form or in a common admixture in any proportion for injection into a geological formation through the injection well, resulting in a final admixture (petroleum/injected solvent) having a much lower viscosity and much greater fluidity than that of the original petroleum, impacting on the entire petroleum production chain
  • the method of the present invention is especially indicated for utilisation when petroleum is of high viscosity or paraffinic and/or the formation is of low permeability, resulting in conditions wherein the petroleum possesses low fluidity characteristics throughout the formation.
  • diesel and/or biodiesel and the other products recommended in the present invention is indicated for petroleums of the paraffinic type, being the case of some occurrences of petroleum of the paraffinic type in Brazilian territory, or even for petroleums in low-temperature environments or which require to be transported under the rigours of such environments.
  • the present invention may also be employed for the displacement of immovable reserves of petroleums of the asphaltenic type wherein a small addition of aromatics to the diesel extraction charge greatly enhances the positive results with said technique.
  • diesel and/or biodiesel is not to be considered primordially as a solvent fluid but should be interpreted as being a fluid whose utilisation is indicated due to it being miscible with the petroleum found in the reservoir, and not be considered as a substance extraneous to the environment wherein it is applied, in addition to also satisfying other requisites of a technical, environmental and economic nature, as aforestated.
  • An objective of the present invention is to provide a sustainable method of recovery by means of which significant quantities of oil may be extracted from a reservoir bearing petroleum of low fluidity through reduction in viscosity of said viscous oil with the objective of improving flow within the reservoir and pumping conditions.
  • Another objective of the present invention is to provide an improved process by means of which additional quantities of oil may still be recovered from reservoirs containing oil of low fluidity, principally those reservoirs which have already been normally treated by water and/or steam flooding and which in many cases would now be considered as being exhausted, wherein the procedure occurs by means of injecting into such geological formation, containing said petroleum of low fluidity, the miscible fluid referred to, such recovery being realised without requiring injection of excessive quantities of fluid miscible with the petroleum within the reservoir and which same is pushed throughout the extent of the reservoir by means of a displacing fluid such as, for example, water.
  • a further objective of the present invention is to provide a process of recovery by means of which an oil of low fluidity may be recovered from geological formations in a shorter time through the injection of smaller quantities of fluid and in more favourable ratios of oil to injected fluid than are possible through application of presently-known processes.
  • a yet further relevant aspect of the method of the present invention is that the fluid miscible with the oil contained in the formation rather than being injected through the production well is injected into the geological formation through the injection well resulting in the solvent traversing the formation from the injection well to the production well and, as a function of the difference in viscosity between the miscible fluid, lying in the intermediate band between water and the oil, it acts in a decisive manner on the effectiveness of displacement through the reduction in viscosity and dissolution of the heavier fractions of the oil impregnated in the formation and on the sweeping effectiveness.
  • the method of the present invention has a yet further consequence of its mechanism of acting, being a significant improvement in displacement effectiveness and sweeping effectiveness within the geological petroleum-bearing formation, being the two key points of attack of the methods of Enhanced Petroleum Recovery.
  • Such characteristics are of operational importance insofar as their acting conjointly contributes to more homogeneous distribution of capillarity, preventing preferential routes through the subject formation, in addition to preventing separation along the route traversed by the drive fluid.
  • a further important aspect is that the method of the present invention may be applied employing the same devices and equipment utilised for secondary recovery, injection of water and/or steam, at the pressure and the temperatures of the environment of the geological formation to be treated.
  • the present invention refers to the injection of liquid petroleum fractions, the classification of such petroleum fractions according with the number of carbons in the chain, as shown in Table I below. TABLE I REFINERY PRODUCT HYDROCARBON BAND Gas C 1 - C 4 Petrol C 5 - C 10 Kerosene C 11 - C 18 Diesel C 14 - C 18 Heavy gas oil C 12 - C 25 Lubricating oil C 20 - C 40 Residue > C 40
  • a small fraction of an aromatic solvent such as xylene or toluene should be admixed with the viscosity reducers subject of this patent to prevent precipitation of asphaltenes.
  • the first criterion for the evaluation of viscosity reducers has been that of the least environmental impact which they might cause.
  • diesel oil a light petroleum represented here by oil from a specific well (Petrobrás, Brazil)
  • turpentine and kerosene presented the least negative environmental impact, that is to say less toxicity, less danger, less risk of explosion than the other solvents due to having lower vapour pressures than the others.
  • this latter should possess a viscosity lower than 300 cP, preferably lower than 250 cP, more preferably lower than 200 cP.
  • EPR Enhanced Petroleum Recovery
  • the injection of water or gas (displacing fluids during Secondary Recovery) has as its purpose displacement of the (displaced) oil in the reservoir by means of purely-mechanical behaviour, that is to say on injecting water or on subjecting the reservoir to a process of immiscible gas injection it is not expected that there will be chemical or thermodynamic interaction of such fluids with the oil or with the rock.
  • the fluid injected displaces the oil, occupying the pores vacated by the oil as the latter is expelled from the formation, however not the entire volume swept by the displacing fluid expels the oil.
  • Such oil remaining in the regions invaded by the fluid injected is denominated residual and is a consequence of the effect of capillarity.
  • EPR and Secondary Recovery always presuppose an injected (displacing) phase having the objective of displacing the oil.
  • the final recovery factor is a function of two aspects of effectiveness of such displacing phase: Sweeping Effectiveness, linked to viscous forces or the water/oil viscosity difference; and Displacement Effectiveness, linked to the effectiveness of driving the oil from the swept area, associated with capillary forces. Said two aspects define the points of attack of Enhanced Petroleum Recovery causing modifications to the physico-chemical and thermodynamic nature of the fluids and interactions between the same and the formation.
  • the novel concept herein presented proposes a method of Enhanced Petroleum Recovery based on the injection of a slug of diesel oil through the injection well of the formation followed by injection of water.
  • the present invention is a method of Enhanced Petroleum Recovery combining technical, economic, environmental and social effectiveness to increase the recovery factor of onshore or offshore fields having a high level of exploitation, more precisely the use of solvent, diesel oil, biodiesel and other similar products, used separately or in conjunction with other fluids or methods such as steam, polymers, etc, its acting mechanism being improvement in Displacement Effectiveness and Sweeping Effectiveness, the two key points of attack of Enhanced Petroleum Recovery (EPR) methods.
  • EPR Enhanced Petroleum Recovery
  • application of the method of the invention permits rendering high-viscosity petroleum suitable for the operational conditions of lifting and transport by virtue of ensuring flushing in production wells, lines and pipelines.
  • the example provided below presents a specific application of the invention to an oil produced in Brazil; due to the high-viscosity characteristics of the type of Brazilian paraffinic petroleum denominated Nativo Oeste (API-13, viscosity 3500 cP) the present invention was applied utilising a number of more-available substances having been tested with the objective of use as viscosity-reducing additives in the injection operation through injection wells in production activities.
  • API-13 paraffinic petroleum denominated Nativo Oeste
  • diesel achieves the result of lowering viscosity from 3500 cP to less than 250 cP at concentrations of solely 15 - 20%, placing it in an advantageous position with respect to the other reducers analysed, taking into account the technical, economic and environmental parameters considered for the diverse solvents available in the Brazilian market.
  • diesel oil extracted admixed with said petroleum may be returned to the injection process following normal processing of the oil recovered by extraction.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
EP07254825A 2006-12-22 2007-12-12 Procédé durable pour la récupération de pétrole Withdrawn EP1939393A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BRPI0605371-8A BRPI0605371A (pt) 2006-12-22 2006-12-22 método sustentável para recuperação de petróleo

Publications (1)

Publication Number Publication Date
EP1939393A1 true EP1939393A1 (fr) 2008-07-02

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EP07254825A Withdrawn EP1939393A1 (fr) 2006-12-22 2007-12-12 Procédé durable pour la récupération de pétrole

Country Status (5)

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US (2) US20080173447A1 (fr)
EP (1) EP1939393A1 (fr)
BR (1) BRPI0605371A (fr)
CA (1) CA2630682A1 (fr)
NO (1) NO20076519L (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101845298A (zh) * 2010-05-18 2010-09-29 徐如思 油溶性超稠油降粘剂
CN109294548A (zh) * 2018-11-29 2019-02-01 西安长庆化工集团有限公司 一种老化油用低温破乳降粘剂及其制备方法和应用

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US8272442B2 (en) 2007-09-20 2012-09-25 Green Source Energy Llc In situ extraction of hydrocarbons from hydrocarbon-containing materials
US8101812B2 (en) 2007-09-20 2012-01-24 Green Source Energy Llc Extraction of hydrocarbons from hydrocarbon-containing materials
US8404108B2 (en) 2007-09-20 2013-03-26 Green Source Energy Llc Extraction of hydrocarbons from hydrocarbon-containing materials and/or processing of hydrocarbon-containing materials
CA2688937C (fr) 2009-12-21 2017-08-15 N-Solv Corporation Procede d'extraction par solvant a plusieurs etapes pour gisements de petrole lourd
US20110174488A1 (en) * 2010-01-15 2011-07-21 Patty Morris Accelerated start-up in sagd operations
CA2693640C (fr) 2010-02-17 2013-10-01 Exxonmobil Upstream Research Company Separation a l'aide d'un solvant dans un procede d'extraction recourant principalement a l'injection de solvants
CA2696638C (fr) 2010-03-16 2012-08-07 Exxonmobil Upstream Research Company Utilisation d'une emulsion dont la phase externe est un solvant pour la recuperation in situ de petrole
CA2705643C (fr) 2010-05-26 2016-11-01 Imperial Oil Resources Limited Optimisation du processus de recuperation domine par un solvant
MX359374B (es) 2013-10-22 2018-09-13 Mexicano Inst Petrol Aplicacion de una composicion quimica para la reduccion de la viscosidad de petroleos crudos pesados y extrapesados.
US10859549B2 (en) 2017-02-07 2020-12-08 Microsilicon, Inc. Online monitoring of production processes using electron paramagnetic resonance (EPR)
US10690800B2 (en) * 2017-02-07 2020-06-23 Microsilicon, Inc. Online monitoring of production process using electron paramagnetic resonance(EPR)
CA2972203C (fr) 2017-06-29 2018-07-17 Exxonmobil Upstream Research Company Solvant de chasse destine aux procedes ameliores de recuperation
CA2974712C (fr) 2017-07-27 2018-09-25 Imperial Oil Resources Limited Methodes ameliorees de recuperation d'hydrocarbures visqueux d'une formation souterraine comme etape qui suit des procedes de recuperation thermique
CA2978157C (fr) 2017-08-31 2018-10-16 Exxonmobil Upstream Research Company Methodes de recuperation thermique servant a recuperer des hydrocarbures visqueux d'une formation souterraine
CA2983541C (fr) 2017-10-24 2019-01-22 Exxonmobil Upstream Research Company Systemes et methodes de surveillance et controle dynamiques de niveau de liquide
US11408250B2 (en) * 2017-11-14 2022-08-09 Halliburton Energy Services, Inc. Adjusting the zonal allocation of an injection well with no moving parts and no intervention
CN114592838B (zh) * 2020-12-04 2023-08-22 中国石油天然气股份有限公司 一种层状超稠油油藏蒸汽驱潜力评价方法及系统
CN117408578B (zh) * 2023-12-14 2024-03-15 中国石油大学(华东) 一种多级压裂水平井综合压裂潜力量化预评价方法

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US3135326A (en) 1960-11-21 1964-06-02 Oil Sand Conditioning Corp Secondary oil recovery method
US3127934A (en) 1961-05-18 1964-04-07 Pure Oil Co Solvent injection petroleum recovery method
US3467191A (en) * 1966-04-07 1969-09-16 Shell Oil Co Oil production by dual fluid injection
GB2096670A (en) * 1981-04-10 1982-10-20 Mobil Oil Corp Recovery of oil from tilted reservoirs
US4531586A (en) 1981-10-01 1985-07-30 Mobil Oil Corporation Method of solvent stimulation of heavy oil reservoirs
US4899817A (en) * 1988-12-15 1990-02-13 Mobil Oil Corporation Miscible oil recovery process using carbon dioxide and alcohol

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101845298A (zh) * 2010-05-18 2010-09-29 徐如思 油溶性超稠油降粘剂
CN101845298B (zh) * 2010-05-18 2013-04-10 徐如思 油溶性超稠油降粘剂
CN109294548A (zh) * 2018-11-29 2019-02-01 西安长庆化工集团有限公司 一种老化油用低温破乳降粘剂及其制备方法和应用
CN109294548B (zh) * 2018-11-29 2020-11-10 西安长庆化工集团有限公司 一种老化油用低温破乳降粘剂及其制备方法和应用

Also Published As

Publication number Publication date
US20080173447A1 (en) 2008-07-24
CA2630682A1 (fr) 2008-06-22
NO20076519L (no) 2008-06-23
US20100006285A1 (en) 2010-01-14
BRPI0605371A (pt) 2008-08-05

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