scholarly journals Use of Oil Field Water Shut off Techniques in Crude Oil Recovery from A Depleted Oil Field of Upper Assam Basin

2011 ◽  
Vol 4 (8) ◽  
pp. 653-656
Author(s):  
Dhrubajyoti Neog ◽  
◽  
Dr Subrata Bogohain Gogoi ◽  
Dr Pradip Bogohain
Keyword(s):  
Crude Oil ◽  
Oil Recovery ◽  
Oil Field ◽  
Oil Field Water

scholarly journals Review of Oilfield Chemicals Used in Oil and Gas Industry

2021 ◽  
pp. 8-24
Author(s):  
M. Chukunedum Onojake ◽  
T. Angela Waka
Keyword(s):  
Natural Gas ◽  
Crude Oil ◽  
Oil Recovery ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Petroleum Industry ◽  
Oil And Gas Industry ◽  
Oil Field ◽  
Wide Range ◽  
Oilfield Chemicals

The petroleum industry includes the global processes of exploration, extraction, refining, transportation and marketing of natural gas, crude oil and refined petroleum products. The oil industry demands more sophisticated methods for the exploitation of petroleum. As a result, the use of oil field chemicals is becoming increasingly important and has received much attention in recent years due to the vast role they play in the recovery of hydrocarbons which has enormous  commercial benefits. The three main sectors of the petroleum industry are Upstream, Midstream and Downstream. The Upstream deals with exploration and the subsequent production (drilling of exploration wells to recover oil and gas). In the Midstream sector, petroleum produced is transported through pipelines as natural gas, crude oil, and natural gas liquids. Downstream sector is basically involved in the processing of the raw materials obtained from the Upstream sector. The operations comprises of refining of crude oil, processing and purifying of natural gas. Oil field chemicals offers exceptional applications in these sectors with wide range of applications in operations such as improved oil recovery, drilling optimization, corrosion protection, mud loss prevention, drilling fluid stabilization in high pressure and high temperature environment, and many others. Application of a wide range of oilfield chemicals is therefore essential to rectify issues and concerns which may arise from oil and gas operational activities. This review intends to highlight some of the oil field chemicals and  their positive applications in the oil and gas Industries.

Research on Treatment Technology as Resource of Polymer-Containing Oily Sludge

2014 ◽  
Vol 955-959 ◽  
pp. 2677-2682 ◽  
Author(s):  
Xian Qing Yin ◽  
Fei Fei Hu ◽  
Bo Jing ◽  
Jian Zhang ◽  
Xi Zhou Shen ◽  
...  
Keyword(s):  
Crude Oil ◽  
Oil Recovery ◽  
Sewage Treatment ◽  
Oil Field ◽  
Oily Sludge ◽  
Processing Plant ◽  
Environment Protection ◽  
Treatment Technology ◽  
Oil Water ◽  
Separating Agent

With the rapid implementation of polymer flooding in Bohai oil field, the produced liquid includes large amount of polymer-containing oily sludge reversed increases year by year. The polymer-containing oily sludge accumulates at the terminal processing plant, which not only obviously degrades the performance of sewage treatment instruments and blocks the oil/water separators, but also has a bad impact on environment. Using thermal chemical treatment technology with dynamical separating agent and optimizing separation conditions, the completed processing technology is obtained as follow: thermal chemical reaction, separation on standing, crude oil recovery and recycling of waste water. The recovery rate of crude oil from the samples treatment is over 94%. The obtained technology plays an important role in recycling of source, environment protection and technical support of increasing produced liquid.

scholarly journals Dynamics of Changes in Composition and Stability of the Heavy Oil Sampled from the Usinskoye Oil Field as a Result of Formation Treatment with a Sol-Forming EOR System

2019 ◽  
pp. 464-472
Author(s):  
Darya I. Chuikina ◽  
Tatiana V. Petrenko ◽  
Larisa D. Stakhina
Keyword(s):  
Crude Oil ◽  
Oil Recovery ◽  
Heavy Oil ◽  
Oil Field ◽  
Aggregative Stability ◽  
Heavy Oils ◽  
Asphaltene Precipitation ◽  
Liquid Adsorption ◽  
Oil Displacement ◽  
Before And After

The paper deals with a sol-forming system for oil recovery enhancement (EOR system) used to increase the rate of heavy oil displacement. The effect of sol-forming EOR system during the heavy oil displacement on the composition and stability of oil sampled from the Usinskoye oil field of Russia is investigated. The composition of a crude oil also plays an important role in changing its stability. The work is aimed to investigate stability of heavy crude oil in regards to asphaltene precipitation. For asphaltene toluene/n-heptane solutions, the aggregation stability of asphaltenes based on сhange in the optical density with time is investigated via spectrophotometry. SARA analysis is used to characterize the compositions of heavy oils. First, the content of asphaltenes precipitated from the oil samples is determined and then the samples of deasphalted crude oil (maltenes) are analyzed by the method of liquid adsorption chromatography for the purpose to study the composition of oil sampled from the wells before and after their treatment with the sol-forming EOR system. It is found out that the treatment of reservoir crude oil with the sol-forming EOR system results in changes in composition of saturated, aromatic hydrocarbons, resins, and asphaltenes (SARA components) and aggregative stability of produced oil. The results obtained showed that the aggregative stability of heavy oil depends not only on the content of SARA components in the dispersion medium but on the presence of metalloporphyrins in the oil. Metalloporphyrins could act as inhibitors of asphaltene precipitation, which is an additional factor responsible for the stabilization of the oil dispersed system

scholarly journals Study of Influences of Fracture Additives on Stability of Crude Oil Emulsion

2018 ◽  
Vol 11 (1) ◽  
pp. 118-128
Author(s):  
Hongbo Fang ◽  
Mingxia Wang ◽  
Xiaoyun Liu ◽  
Weinan Jin ◽  
Xiangyang Ma ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Crude Oil ◽  
Oil Recovery ◽  
Oil Field ◽  
Stable Emulsion ◽  
Water Emulsion ◽  
High Efficient ◽  
Fracture Fluid ◽  
Oil Water ◽  
The Stability

Background: A hydraulic fracture is a key technology to increase production of the low permeability oil fields. Fracture additives such as gels, friction reducers, pH adjusters and clay stabilizers were injected into the underground. While more than 50% of the fracture fluid remains underground. The residue of fracture fluid comes out with the produced liquid (a mixture of crude oil and water) in the subsequent oil recovery process, which results in a highly stable crude oil-water emulsion. Objective: The stability and stable mechanism of the emulsion with fracture fluid have been experimentally investigated. Materials and Methods: The influences of fracture additives and components of crude oil on the stability of emulsion were investigated by bottle test and microscopic examination. The interfacial tension and modulus of dilation were explored by a spinning drop interfacial tension meter and an interface expansion rheometer, respectively. Results: The fracture additives played the key role on the emulsion stability. On one hand, the interface energy of oil-water was reduced by friction reducer (IFT was decreased from 24.0 mN/m to 1.9 mN/m), which was a favor for the formation of an emulsion. On the other hand, the dilational modulus of crude oil-water film was increased by hydroxypropyl guar and pH adjuster (Na2CO3) to form a viscoelastic film, which resulted in a highly stable emulsion. Conclusion: The residual fracture fluid accompanied by produced liquid resulted in a highly stable emulsion. The emulsion with fracture additives was difficult to be broken, which may affect the normal production of the oil field. A positive strategy such as developing demulsifier with high efficient should be put onto the schedule.

scholarly journals Support Vector Machine Model for Predicting Gas Saturated and Undersaturated Crude Oil Viscosity of Niger Delta Oil Reservoir

2021 ◽  
pp. 59-65
Author(s):  
Isemin Isemin ◽  
Akinsete Oluwatoyin ◽  
Akpabio Julius
Keyword(s):  
Support Vector Machine ◽  
Crude Oil ◽  
Oil Recovery ◽  
Niger Delta ◽  
Oil Field ◽  
Support Vector ◽  
Oil Viscosity ◽  
Machine Model ◽  
Data Set ◽  
Average Absolute Relative Error

Oil viscosity is one of the most important physical and thermodynamic property used when considering reservoir simulation, production forecasting and enhanced oil recovery. Traditional experimental procedure is expensive and time consuming while correlations are replete however they are limited in precision, hence need for a new Machine Learning (ML) models to accurately quantify oil viscosity of Niger Delta crude oil. This work presents use of ML model to predict gas-saturated and undersaturated oil viscosities. The ML used is the Support Vector Machine (SVM), it is applicable for linear and non-linear problems, the algorithm creates a hyperplane that separates data into two classes. The model was developed using data sets collected from the Niger Delta oil field. The data set was used to train, cross-validate, and test the models for reliability and accuracy. Correlation of Coefficient, Average Absolute Relative Error (AARE) and Root Mean Square Error (RMSE) were used to evaluate the developed model and compared with other correlations. Result indicated that SVM model outperformed other empirical models revealing the accuracy and advantage SVM a ML technique over expensive empirical correlations.

scholarly journals A Novel Approach to Enhance Crude Oil Recovery Ratio Using Selected Bacterial Species

2021 ◽  
Vol 11 (21) ◽  
pp. 10492
Author(s):  
Hakima A. Althalb ◽  
Izzeddin M. Elmusrati ◽  
Ibrahim M. Banat
Keyword(s):  
Crude Oil ◽  
Oil Recovery ◽  
Bacterial Species ◽  
Packed Column ◽  
Oil Field ◽  
Low Flow ◽  
Bacillus Species ◽  
Bacillus Sp ◽  
Bacterial Strains ◽  
Nocardia Cyriacigeorgica

The high viscosity and low flow properties of some crude oil make them difficult to extract from oil reservoirs. This study investigated the mechanisms responsible for the enhancement of oil recovery using fractured dolomite core models. Bacterial strains, Nocardia cyriacigeorgica, Bacillus species, and Pseudomonasputida, isolated from Libyan oil fields, had the ability to biotransform heavy crude oil by reducing its viscosity and converting heavier components into lighter ones. The efficiencies of the three bacterial strains were assessed using sand-packed column experiments through the injection of bacteria to mimic in-situ oil recovery. The optimum biotransformation values of Libyan Bouri crude oil were determined as 77.1, 61.2, and 61.1% using the Bacillus sp., P. putida, and Nocardia cyriacigeorgica, respectively, at 55 °C. Viscosity analyses showed that these strains resulted in the reduction of the viscosity of the crude oil at two different temperatures of 37 and 55 °C. The highest recovery of residual oil was about 11.3% using Bacillus sp. The study confirmed that the selected bacterial species were capable of displacing additional oil under simulated oil field conditions.

Estimation of the Combustion Temperature Profile in a Romanian Oil Field

2018 ◽  
Vol 69 (10) ◽  
pp. 2669-2676
Author(s):  
Gheorghe Branoiu ◽  
Tudora Cristescu ◽  
Iulian Nistor
Keyword(s):  
Crude Oil ◽  
Oil Recovery ◽  
Heavy Oil ◽  
Thermal Regime ◽  
Oil Field ◽  
In Situ Combustion ◽  
Wide Range ◽  
Heavy Crude ◽  
Thermal Oil

Developing and producing of the heavy crude oil involved significant economic and technological challenges. The oil industry ability to prospect and capitalize the huge world heavy oil resources both economically and environmentally friendly will be crucial in helping meet future energy needs. Thermal oil recovery is one of the three types of techniques belonging to Enhanced Oil Recovery. It is applied for increasing the cumulative of crude oil that can be produced in an oil field. One of the oldest thermal oil recovery is in-situ combustion or fireflooding applied for the first time about 100 years ago. Despite in-situ combustion has not found widespread acceptance among operators like other thermal processes (such as steam injection), analysis of the successful projects indicates that the process is applicable to a wide range of oil reservoirs, especially to heavy crude oils. An important monitoring parameter of thermal oil recovery process is represented by thermal regime especially in heavy oil fields in which a high-temperature regime must be occur as the in-situ combustion to be successful. In the paper the authors are using thermal analysis (thermogravimetric and thermodifferential analysis) for investigation of the thermal regime involved in the production process of an oil reservoir by in-situ combustion.

Laboratory characterization of crude oil and sandstone reservoir for chemical enhanced oil recovery

2018 ◽  
Vol 15 (3) ◽  
pp. 354-361 ◽  
Author(s):  
Mohammed Falalu Hamza ◽  
Hassan Soleimani ◽  
Chandra Mohan Sinnathambi ◽  
Zulkifli Merican Aljunid Merican ◽  
Karl Dunbar Stephen
Keyword(s):  
Physicochemical Properties ◽  
Crude Oil ◽  
Oil Recovery ◽  
Pour Point ◽  
Oil Field ◽  
Chemical Flooding ◽  
Content Type ◽  
The Core ◽  
Bulk Volume ◽  
Sandstone Reservoir

Purpose Because of the increasing global oil demand, efforts have been made to further extract oil using chemical enhanced oil recovery (CEOR) methods. However, unlike water flooding, understanding the physicochemical properties of crude oil and its sandstone reservoir makeup is the first step before embarking to CEOR projects. These properties play major roles in the area of EOR technologies and are important for the development of reliable chemical flooding agents; also, they are key parameters used to evaluate the economic and technical feasibilities of production and refining processes in the oil industries. Consequently, this paper aims to investigate various important physicochemical properties of crude oil (specific gravity; American Petroleum Institute [API]; viscosity; pour point; basic sediment and water; wax; and saturate, aromatic, resins and asphaltenes components) and sandstone reservoir makeup (porosity, permeability, bulk volume and density, grain volume and density, morphology and mineral composition and distributions) obtained from Malaysian oil field (MOF) for oil recovery prediction and design of promising chemical flooding agents. Design/methodology/approach Three reservoir sandstones from different depths (CORE 1; 5601, CORE 2; 6173 and CORE 3; 6182 ft) as well as its crude oil were obtained from the MOF, and various characterization instruments, such as high temperature gas chromatography and column chromatography for crude’s fractions identification; GC-simulated distillation for boiling point distribution; POROPERM for porosity and permeability; CT-Scan and scanning electron microscopy-energy dispersive X-ray for morphology and mineral distribution; wax instrument (wax content); pour point analyser (pour point); and visco-rheometre (viscosity), were used for the characterizations. Findings Experimental data gathered from this study show that the field contains low viscous (0.0018-0.014 Pa.s) sweet and light-typed crude because of low sulfur content (0.03 per cent), API gravity (43.1o), high proportion of volatile components (51.78 per cent) and insignificant traces of heavy components (0.02 per cent). Similarly, the rock permeability trend with depth was found in the order of CORE 1 < CORE 2 < CORE 3, and other parameters such as pore volume (Vp), bulk volume (Vb) and grain volume (Vg) also decrease in general. For grain density, the variation is small and insignificant, but for bulk density, CORE 2 records lower than CORE 3 by more than 1 per cent. In the mineral composition analysis, the CORE 2 contains the highest identified mineral content, with the exception of quarts where it was higher in the CORE 3. Thus, a good flow crude characteristic, permeability trend and the net mineral concentrations identified in this reservoir would not affect the economic viability of the CEOR method and predicts the validation of the MOF as a potential field that could respond to CEOR method successfully. Originality/value This paper is the first of its kind to combine the two important oil field properties to scientifically predict the evaluation of an oil field (MOF) as a step forward toward development of novel chemical flooding agents for application in EOR. Hence, information obtained from this paper would help in the development of reliable chemical flooding agents and designing of EOR methods.

scholarly journals WATERFLOOD SUSCEPTIBILITY OF NGRAYONG SANDSTONE RESERVOIR IN �X�-WELL, XYZ FIELD, EAST JAVA (WATERFLOOD SUSCEPTIBILITY PADA RESERVOIR BATUPASIR NGRAYONG DI SUMUR-�X�, LAPANGAN XYZ, JAWA TIMUR)

2018 ◽  
Vol 40 (1) ◽  
pp. 9-23
Author(s):  
Rosidelly Rosidelly
Keyword(s):  
Crude Oil ◽  
Critical Velocity ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Pore Volume ◽  
Oil Field ◽  
Injection Velocity ◽  
Central Java ◽  
Injection Water ◽  
Water Cut

Antiklinorium structures that are spreading in the area of Rembang Zone along the Central Java to East Java reflect oil traps that lay under the surface. The oil fields have been exploited since the time of the Dutch occupation leaving the water cut at above 95%. Interpretation of reserves and production forecasts made by many researchers conclude that the remaining oil is still in the range of 50% (OOIP). To overcome the problem, the Government recently encouraged researchers to conduct a comprehensive review in terms of enhanced oil recovery with the goal of increasing the oil recovery in this zone by as much as possible. The XYZ-oil field in the Rembang Zone has a widely spread reservoir sandstone in the border area of the Central Java - East Java. Reservoir rocks in this area contain calcareous and silty matrix. Clay minerals mineral that is easily removed by fluid flow so that it would create problems during the oil production process. The composition of injection water collected from several wells can also easily form slugs and scale as indicated by the occurrence of crude oil and bacteria that behave as a very corrosive substance that tends to facilitate the creation of production and equipment damage. This study conducted an experiment in enhanced oil recovery using waterflooding. To avoid the occurence of non-Darcy flow, critical velocity analysis was conducted obtaining a value of 37.6 ft/day. This velocity is defi ned as a maximum injection velocity of the water displacement in this waterflooding experiment. Based on the waterflooding experiment of X-Well in the laboratory, the injection of oil using injection water without additives led to an increase in oil recovery of 0.77% Pore Volume (%PV), while the displacement of injection water added with additives resulted in an increase in oil recovery by as much as 1.31%PV.Struktur-struktur antiklinorium yang terbentang di daerah Zona Rembang Jawa Tengah hingga Jawa Timur mencerminkan perangkap minyak yang berada di bawah permukaan. Lapangan-lapangan minyak ini sudah dieksploitasi kandungan minyaknya sejak jaman Belanda dimana pada saat ini kandungan water cut sudah di atas 95%. Dari interpretasi cadangan dan produksi yang dilakukan oleh banyak peneliti, diperkirakan minyak yang tersisa masih berada di kisaran 50% (OOIP). Untuk mengatasi hal tersebut akhirakhir ini pemerintah mendorong para peneliti agar melakukan kajian pada lapangan-lapangan minyak di zona tersebut dalam rangka peningkatan perolehan minyak secara menyeluruh dengan target perolehan minyak yang sebesar-besarnya. Lapangan minyak XYZ yang berada di Zona Rembang mempunyai reservoar batupasir yang penyebarannya cukup luas di daerah perbatasan Jawa Tengah Jawa Timur. Batuan reservoir di daerah ini merupakan batupasir berbutir halus yang mengandung matrik gampingan dan lempungan. Mineral lempung hampir terdistribusi merata dengan kandungan kaolinit yang cukup tinggi (30% dari kandungan mineral lempungnya). Kaolinit merupakan mineral yang mudah terlepas oleh adanya aliran fluida sehingga akan menjadikan masalah sewaktu proses produksi berlangsung. Air injeksi dari beberapa sumur mengandung komposisi yang juga memudahkan terbentuknya slug dan scale seperti dijumpainya kandungan crude oil serta bakteri yang bersifat korosif sehingga cenderung memudahkan terbentuknya kerusakan formasi dan korosi pada peralatan pemboran maupun produksi.Sesuai dorongan pemerintah, studi ini dilakukan untuk melakukan percobaan dalam meningkatkan perolehan minyak dengan menggunakan metode waterflooding. Untuk menghindari terjadinya aliran non-Darcy dilakukan analisis Kecepatan Aliran Kritis (Critical Velocity) dimana hasilnya diperoleh = 37.6 ft/day, yang ditetapkan sebagai kecepatan pendesakan air injeksi maksimum dalam percobaan waterflooding. Berdasarkan percobaan waterflooding dalam sekala laboratorium pada Sumur-X, pendesakan minyak dengan air injeksi tanpa ditambah bahan aditif menghasilkan peningkatan perolehan minyak sebesar 0.77% Pore Volume (0.77%PV), sedang jika air injeksi ditambah bahan aditif peningkatan perolehan minyak dapat mencapai 1.31%PV.

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