An Overview of Formation Damage and Well Productivity in Oilfield Operations

Krueger, R.F.

doi:10.2118/10029-pa

Cited by 158 publications

(46 citation statements)

References 20 publications

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“…A convenient method of discussing the solubility of a solute is by means of a solubility product (K 0 sp ) Consider the addition of a solute MX(s) to distilled water. At the limit of solubility, there is a dynamic equilibrium, which can be represented as follow [15]: (1) and the equilibrium constant, for the solubility process is given as [15]: (2) Since the activity, a, of a pure solid MX(s) is unity, the equilibrium expression then simplifies to [15]:…”

Section: Solubility Productmentioning

confidence: 99%

“…Occurrence of the deposition within the porous media of the reservoir causes formation damage and in the production facilities results in blockage and hence subsequent operational problems [1][2][3]. Among different kinds of potential scales, carbonate and sulphate scales are the ones, which are mostly encountered in the oil field [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and Theoretical Study of Calcium Sulphate Precipitation in Porous Media Using Glass Micromodel

Ghaderi

Kharrat

Tahmasebi

2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Étude théorique et expérimentale de la précipitation de sulfate de calcium en milieu poreux sur micromodèle de verre -Le mélange de deux eaux incompatibles lors d'injection d'eau donne habituellement lieu à précipitation et formation de dépôts minéraux dans les milieux poreux. Ces dépôts qui réduisent la porosité et surtout la perméabilité de la roche ont une influence considérable sur les performances des scénarios d'injection d'eau. Dans cette étude, une série d'expériences a permis d'étudier l'effet de différents paramètres sur la précipitation progressive de sulfate de calcium. Il s'agit notamment de la température, de la concentration des saumures mélangées, de la pression et du débit. En raison de sa transparence, un micromodèle de réseau représentatif d'un grès mouillable à l'eau a été utilisé comme support poreux et a permis d'observer facilement la formation et la distribution des dépôts minéraux. De plus, le suivi du déplacement des particules solides est largement facilité par le nouveau dispositif expérimental proposé. Les photos de coupes obtenues en microscopie montrent que le dépôt est initié sur les parois et les seuils des pores, qu'il se propage vers l'intérieur de ces pores, et que les cristaux solides ont une forme en crête de coq. Pour une meilleure compréhension de l'effet de chacun des paramètres mentionnés ci-dessus, il a été tracé une courbe de la réduction de perméabilité en fonction du volume de solution de saumure injectée dans les pores. Les résultats ont indiqué que l'augmentation de la température, de la concentration de saumure et du débit conduisent à une augmentation de la tendance au dépôt de minéraux. La pression n'a qu'un rôle mineur sur le développement du processus. Le dépôt de CaSO 4 se modélise comme une fonction de réduction de la perméabilité dépendante des différents paramètres. C'est pourquoi il a été proposé une fonction exponentielle (de corrélation) qui intègre sous une forme adimensionnelle tous les paramètres physiques ayant une influence sur le comportement du système. Le nombre de Reynolds, l'index de précipitation et l'écart par rapport aux conditions d'équilibre constituent le fondement de cette corrélation. Les exposants ajustables de l'équation ont été déterminés et optimisés au moyen d'un algorithme génétique. Cette corrélation significative peut également prédire, avec une précision raisonnable, les résultats issus d'expériences sur carottes. Abstract -Experimental and Theoretical Study of Calcium Sulphate Precipitation in Porous Media

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Section: Solubility Productmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of Calcium Sulphate Precipitation in Porous Media Using Glass Micromodel

Ghaderi

Kharrat

Tahmasebi

2009

Oil & Gas Science and Technology - Rev. IFP

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“…Hower (1974) studied the distribution of clay minerals in the United States Gulf Coast and pointed out that the formation damage degree depended on the contents, types of clay mineral and their position in the rock. Krueger (1986), Amaerule, Kersey, Norman, and Shannon. (1988), Porter (1989) and Reed (1989) comprehensively reviewed the research of formation damage, which reflected the achievements of the 80s.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of petrophysical properties of a tight formation by considering the clay minerals and flow sensitivities

Guang-fen

et al. 2016

Earth sci. res. j.

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Quantitative X-ray diffraction analysis of rock, X-ray diffraction analysis of clay minerals types and components, Field Emission Scanning Electron Microscope (FESEM) and sensitivity flow experiments methods were used to research the effects of clay minerals on the porosity and permeability of Ordos Basin's tight Chang 7 reservoir (Zhenbei area). These methods were also used to analyze the type, degree, and factors affecting reservoir sensitivity. The research showed that the reservoir possessed poor water, salt, and alkali sensitivity, poor to strong acid sensitivity and none to poor velocity sensitivity. Acid sensitivity among them had comparatively large differences, mainly because acid sensitivity was not only affected by chlorite but also by components of carbonate minerals. Stress sensitivity experiment results showed that the maximum degree of permeability damage in the rocks of this reservoir was median to very strong; irreversible damage level was weak to strong. Consequently, the experimental studies are favorable to not only determine the factor dominating the petrophysical properties of the tight formation, but also to optimize the follow-up development strategies, e.g. injection schedule and hydraulic fracturing implement.Este trabajo utilizó análisis cuantitativos de rocas por difracción de rayos X, análisis de los tipos y componentes de arcillas minerales por difracción de rayos X, análisis con el microscopio electrónico de efecto de campo (FESEM, del inglés Field Emission Scanning Electron Microscope) y ensayos de respuesta de flujo para investigar los efectos de las arcillas minerales en la porosidad y permeabilidad del depósito Chang 7, en la cuenca del Ordos (región Zhenbei). Estos métodos también se utilizaron para analizar el tipo, el grado y los factores que afectan la respuesta del depósito. La investigación demuestra que el depósito posee poca agua, sal y respuesta alcalina, baja a fuerte respuesta de acidez, y ninguna a baja respuesta de velocidad. Entre estas características, la respuesta de acidez presentó grandes diferencias comparativas debido a que está afectada tanto por el clorito como por los componentes de minerales carbonatos. Los resultados de los ensayos de respuesta de tensión muestran que el máximo grado de daño por permeabilidad en las rocas del depósito es de mediano a muy fuerte; el nivel de daño irreversible va de débil hasta fuerte. Por lo tanto lo estudios experimentales son favorables no solo para determinar el factor dominante en las propiedades petrofísicas de la formación compacta sino también para optimizar las futuras estrategias de desarrollo, como una programación de las tareas de inyección y la implementación de la fractura hidráulica.

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“…Emulsion particles, which are larger than pore throat sizes, will block the pores, increase viscosity and thus reduce effective hydrocarbon mobility and impair productivity. 3,4 Table 1 illustrates the origin, mechanism and type of formation damage problems encountered in many oil or gas producing wells 5 . If stimulation procedures such as acidizing and fracturing, and completion procedures such as perforation density and design optimum oil flow rates, are not optimized with respect to reservoir lithology, further damage to the formation could occur.…”

Section: Introductionmentioning

confidence: 99%

Causes of Formation Damage and Guidelines for Remadial Treatment for Western Sirte Bain Libyan Carbonate Oil Reservoirs

2016

6th International Conference on Biological, Chemical &Amp; Environmental Sciences (BCES-2016) August 8-9, 2016 Pattaya (Thailan

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Abstract-Formation damage is the main cause of decreasing the production in many oil wells because of reducing the inflow from the reservoir to the well bore which is caused by lowering the permeability in the well bore region. The reduction in the permeability is caused by many factors among which organic or inorganic scale precipitation, solid plugging, compatibility reversal and formation of emulsions are the main causes of this problem. Formation damage caused by inappropriate drilling, completion, workover and production schemes is a major cost to the oil and gas industry worldwide.Formation damage makes many producing oil zones to be feasibly uneconomical prospect because of their low productivity because of the changes occurred during production due to improper operating practices. The reservoir rock and resident fluids are essentially in a state of physicochemical and thermodynamic equilibrium. Disruptions in this equilibrium due to changes in pressure, temperature and fluid chemistry around the wellbore region can create barriers to flow and yield lower production rates. This formation damage problem which causes reduction in the overall oil recovery from well and consequently from the reservoir makes it necessary to diagnose and to treat the problem in the early life of the well.The cost of formation damage worldwide is unquestioningly staggering. Reservoirs can undergo different degrees of damage and good producers can still provide sufficient economic return despite near wellbore permeability reduction. Scenarios such as these are even more common than those in which production is ceased on below economic limits. It is often not a question of whether a formation has been damaged, but if the reservoir has been optimally stimulated and is operating at its maximum potential.The objective of this research is to study and investigate the causes of formation damage in some Western Sirte Basin carbonate reservoirs in Libya. The study has indicated that acid insoluble scales such as barium and calcium sulfate scales are the main salt scales precipitated in the well bore of many producing wells.The results of this study indicated that inorganic scale precipitation has contributed most to the scaling problems resulted from drilling, completion, workover and stimulation fluids as well as from the produced water during the production phase of the wells. Other major mechanisms such as mud solids plugging, clay swelling, emulsions water blocks, wettability alteration, reduced relative 1 Professor of Petroleum Engineering and Research and projects Coordinator University of Tripoli Libya. Associate researcher at the

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An Overview of Formation Damage and Well Productivity in Oilfield Operations

Cited by 158 publications

References 20 publications

Experimental and Theoretical Study of Calcium Sulphate Precipitation in Porous Media Using Glass Micromodel

Experimental and Theoretical Study of Calcium Sulphate Precipitation in Porous Media Using Glass Micromodel

Experimental study of petrophysical properties of a tight formation by considering the clay minerals and flow sensitivities

Causes of Formation Damage and Guidelines for Remadial Treatment for Western Sirte Bain Libyan Carbonate Oil Reservoirs

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