Factors that affect pressure distribution of horizontal wells in a layered reservoir with simultaneous gas cap and bottom water drive
January 2015
Understanding the behaviour of pressure distribution completed in two layered reservoir subject to both active gas cap and bottom water drive mechanisms is very important in reservoir management. To determine the factors that affect pressure distribution of horizontal wells in a layered reservoir subjected simultaneously with a gas-cap at the top and bottom water drives, well completion was carried out in a particular...
Sensitivity study of low salinity water injection in Zichebashskoe Oilfield
January 2015
Presently, low salinity waterflooding is considered one of the most promising and cost-effective EOR methods. Although the recovery mechanisms are still uncertain, decrease of residual oil saturation and alternation of rock wettability are considered to be main mechanisms of the incremental oil recovery. In addition, laboratory and mathematical studies conducted over recent years suggested that mobility control is also...
Investigation of hydraulic fracture optimization in on Infill well in low permeability reservoirs
November 2014
Well infilling has become an effective approach to enhance oil recovery (EOR) for many years. Closely spaced wells and water injections can help maintain reservoir pressure and enlarge producing pressure drop, which are beneficial to the low permeability reservoir development. After more than 20 years of water injection in the Ansai low permeability oil reservoir (Changqing Oil Field, China), water cut of wells now...
A practical approach to the evaluation of subcritical multiphase flow through down-hole safety valves (storm chokes)
November 2014
A practical approach to the evaluation of subcritical multiphase flow through down-hole safety valves (storm chokes) is presented. This method which is independent of the continuous phase is based on the composition of the flowing mixture and the operating temperature and pressure. In the event of single phase flow, the method can also be applied. With this method, we can easily size subsurface safety valves (SSSV)...
Transfer matrix technique for determining the resonance conditions in retrieving stuck drill pipes with a top vibratory suspended drive
November 2014
A stuck drill pipe has been recognized as one of the most costly and non-productive challenges in drilling operations. Fishing jars are routinely used to un-lock or loosen the stuck (jammed) pipes which in many cases are expensive and the time taken to complete the job can reach several days of continuous jarring. The use of surface mounted vibratory systems has offered an alternative cost effective means to free the...
Development of simple correlations to evaluate the petroleum potential of Quseir - Safaga oil shale, Egypt
October 2014
The specific gravity of oil shale can be used as a practical tool for estimating total organic carbon (TOC) and the oil yield of shales from a given source. Sixteen random oil shale samples, mostly from the Upper Cretaceous Duwi Formation in Quseir - Safaga district in the Eastern Desert of Egypt, were collected. Experiments were conducted to determine the density, TOC and oil yield of such samples. The study has...
Removal of polyaromatic hydrocarbons from waste water by electrocoagulation
September 2014
In the present study, two important groups of factors were studied; the first one corresponds to the Electrocoagulation (EC) process parameters such as current density, pH, electrolysis time and electrolyte concentration that were investigated in terms of their effects on the removal efficiencies of polyaromatic hydrocarbons, specially β-naphthols. The second group of factors analyses the effect of...
Effect of water influx on the inventory of underground gas storage developed in a depleted oil reservoir
June 2014
Effect of water encroachment into an underground gas storage reservoir on its storage capacity (verification of inventory) is presented. Inventory verification is to determine the amount of natural gas to be injected into a particular underground reservoir. Reservoir and production history of a depleted oil reservoir, Z-16T, located in the Niger Delta region were obtained for the analyses. A volumetric equation was used...
Evaluation of rheological properties of Detarium micocarpum, Brachystegea eurycoma using Herschel-Buckley model and their commercial availability
June 2014
Drilling fluids were formulated from biomaterials such as Brachystegea eurycoma and Detarium micocarpum. The laboratory measurements were carried out, and their rheological properties then evaluated. The drilling properties such as yield point, apparent viscosity, and low shear rate yield point were determined from the experimental data. The field polypac additive that is currently in use was formulated and used as...
Pressure transient analysis of multiple leakages in a natural gas pipeline
March 2014
Pipelines are principal devices for natural gas transportation which are amenable to operational challenges such as leakages. Several methods for predicting leakages in natural gas pipeline have been developed. Some of these techniques detect leakages after several hours while some are prone to false alarms or inaccurate predictions. This study developed a pressure transient analysis model for predicting gas pipeline...
A study of the effects of waste lubricating oil on the physical/ chemical properties of soil and the possible remedies
March 2014
Waste oil management in Nigeria is not well supervised, hence the indiscriminate disposition into the soil drains and sometimes open water. This has attendant implications on soil and water quality. Need has arisen to evaluate the consequence of such mismanagement on the environment. This study was designed to evaluate the effects of waste oil on the physical and chemical properties of soil in Lagos, and the possible...
A high temperature N2-foam assisted cyclic steam injection in Fuyv reservoir
December 2013
Steam stimulation has already been proved as an important thermal recovery technology. In Daqing, the development and management of high-heterogeneous heavy oil reservoirs plays an important role in stabilizing the oil output. To combine the good features of steam injection and cyclic injection, a cyclic steam flooding has been conducted in the Fuyv reservoir, Daqing. This paper aims to present a detailed process of the...
Effect of pH on interfacial tension and crude oil–water emulsion resolution in the Niger Delta
December 2013
It is important to know the produced volumes and to effectively separate the oil and water phases in oil well effluents to the surface during production. While it is known that the effectiveness of separating the phases and hence the accuracy of measurements are often affected by the nature of the fluids, the specific contributions of the physical parameters of the fluids are little known. In this study, the effect of...
Prediction of drilling pipe sticking by active learning method (ALM)
November 2013
Stuck piping is a common problem with tremendous impact on drilling efficiency and costs in oil industry. Generally, the stuck pipe troubles are solved after their occurrences by using some standard techniques; here we attempt to predict the causes of occurrence of such problems to eschew risks and excessive drilling costs. If these risks are identified in advance, better solutions can be provided to reduce the...
The perspective of Nigeria’s projected demand for petroleum products
November 2013
Nigeria is Africa's energy giant, and the most prolific oil-producing country in the continent. Export of petroleum is the mainstay of the Nigerian economy and the major source of revenue for the country. The petroleum and natural gas sector accounted for about 19.39% of the nations GDP in 2009. The sector also contributed over 95 and 70% of export earnings and total government revenue, respectively. Nevertheless,...
Analysis of oil flow in fractured oil reservoir using carbondioxide (CO2) foam injection
June 2013
Most carbonate reservoirs are heterogeneous in terms of pore distribution and the matrix is extremely low permeable, hindering the flow of oil, while highly permeable fractures are the primary flow conduit. This study presents the hybrid discrete fracture network (DFN) approach to represent fracture network, more realistically, which is a continuum approach equipped with local grid refinement (LGR). The LGR...
Experimental study of new improved oil recovery from heavy and semi-heavy oil reservoirs by implementing immiscible heated surfactant alternating gas injection
June 2013
After thermal processes, steam injection is the most common enhanced oil recovery (EOR) methods in heavy oil reservoirs. It is common in heavy and semi heavy oil reservoirs to inject gas in conjugate with surfactant solutions to enhance the effect of gas on reservoir fluid which is called surfactant alternating gas (SAG) injection. The interest in immiscible and miscible SAG process has been grown...
Experimental study of surfactant alternating gas injection versus water alternating gas and water flooding enhanced oil recovery methods
June 2013
Nitrogen is used in both the miscible and immiscible gas injection processes in oil reservoirs. In heterogeneous formations, gas tends to early breakthrough due to overriding and fingering. Surfactant alternating gas (SAG) injection is one of the methods commonly used to solve this problem. The foam which is composed in contact area of nitrogen and surfactant, increases injected gas...
Improving well productivity in an Egyptian oil field using radial drilling technique
May 2013
Radial drilling (RD) technique utilizes hydraulic energy to create several lateral holes in different directions and levels with several lengths. These lateral holes are made by milling the casing with small bit then extending these holes laterally using high pressure hydraulic jetting. This work presents full descriptions and analysis for RD applications in one of the Egyptian oil field. Moreover, it...
Development of a new surfactant-polymer system and its implementation in Dagang oilï¬eld
May 2013
In this paper, a new surfactant–polymer enhanced oil recovery (EOR) system is investigated for the feasibility of injection in Dagang. The newSP flooding system has been designed and developed for Dagang oilï¬eld with Dagang petroleum sulfonate (SLPS) as the primary ingredient. The dynamic behavior of the system and the interactions of the system components have been investigated...
Flue gas enhanced oil recovery (EOR) as a high efficient development technology for offshore heavy oil in China
May 2013
China Offshore oilfield is rich in heavy oil, M oilfield in Bohai Bay is the most thick heavy oil field in offshore by far with the formation oil viscosity as high as 450 ~ 950 mPa.s. Using conventional oil field development (depletion and water flooding), the heavy oil field exposed its limits, such as low productivity of single well, low production rate and low predicted recovery. As is well known,...
Comparison between spreadsheet and specialized programs in calculating the effect of scale deposition on the well flow performance
April 2013
Formation damage is an undesirable operational and economic problem that causes a reduction in the productivity, skin damage, and decrease in well performance. Formation damage occurs during the various phases of oil and gas recovery from subsurface reservoirs including production, drilling, hydraulic fracturing, and work over operations. Formation damage assessment, control, and remediation are among the...
Modeling of thermal cracking process in a crude oil refinery
April 2013
In a thermal cracking process, the molecular bonds of the liquid are broken to the lighter ones. Recently due to the availability of more heavy oils, the process interest was to yield light and middle distillate products. In this research, thermal cracking of vacuum residue in a commercial soaker-visbreaking plant is studied. The product of the process is characterized to the light gas (C1, C2), liquefied...
Variation of petrophysical properties due to carbon dioxide (CO2) storage in carbonate reservoirs
April 2013
Depleted hydrocarbon reservoirs, deep saline reservoirs, and un-mineable coal seams are considered the best geological sequestration candidates for carbon dioxide (CO2) geologic storage formations. CO2 sequestration in carbonate reservoirs provides a good way to reduce CO2 release to the atmosphere. This work investigates the effect of the temperature, pressure, and brine salinity on the...
Sonic log analysis in oil wells through Box and Jenkins methodology
March 2013
The sonic profile is used, mainly in exploration wells, which receive greater investment in data acquisition because these wells serve as a reference for analyzing the petroleum potential of the area. The sonic profile was introduced in the 50s, with the goal of providing support for seismic exploration, and subsequently became extensively used for studies on total porosity of the rocks traversed by the well. This paper...
Microbial enhanced oil recovery using potent biosurfactant produced by Pseudomonas sp. from Arabian Sea, Mumbai
March 2013
Increase in oil pollution due to accidental leakages during various ship operations and human activities make these hydrocarbons the most common global environmental pollutants. Current understanding in degradation of these harmful oils involves the isolation of biosurfactants from various isolated microbial strains from contaminated sites of Marine Sea. Biosurfactants are the surface active molecules synthesized by...
A new simulator for surfactant flooding
March 2013
Surfactant as a successful enhanced oil recovery (EOR) agent has been widely used in many mature reservoirs. This research focuses on the description of surfactant solution at low permeability condition. A new three-dimensional, two-phase, three-component surfactant simulator is presented. The simulator is based on the non-Darcy flow characteristics of surfactant flooding in the low permeability formations. The change...
Real-time expert seismology by non-linear oil reserves expert system
February 2013
A non-linear 3-D elastic waves real - time expert system is proposed for the exploration of land and marine oil reserves, according to the new theory of "Real-Time Expert Seismology". This Generic Technology will work under Real Time Logic for searching the land and marine petroleum developed on the continental crust and on deeper water ranging from 300 to 2000 m, or 3000 m, or even more. Hence, the...
Development of enhanced oil recovery in Daqing
February 2013
Chemical flooding is playing an important role in stabilizing oil output in Daqing, which is the largest field in China and started its chemical floods since the last 90's. In Daqing Oilfield, the chemical flooding annual output has exceeded 17 million tons; water cut has been dropped down significantly. The success of chemical enhanced oil recovery (EOR) has encouraged the increasing of chemical...
Investigation into the rheological and filtration properties of drilling mud formulated with clays from Northern Nigeria
January 2013
Rheological properties of drilling mud formulated from ten samples of Nigerian clay and treated with sodium carbonate (Na2CO3) were determined. Four different formulations were made: A (22.5 g / 350 ml of mud + 0% Na2CO3), B (22.5 g / 350 ml of mud + 10% Na2CO3), C (25 g / 350 ml of mud + 10% Na2CO3) and D (28 g / 350 ml of mud + 10% Na2CO3). None of the samples tested in their natural state exhibited...
Determination of petroleum property using artificial intelligence tools
January 2013
Viscosity is one of the most important governing parameters of the fluid flow, either in the porous media or in pipelines. So it is important to use an accurate method to calculate the oil viscosity at various operating conditions. In the literature, several empirical correlations have been proposed for predicting crude oil viscosity. However these correlations are not able to predict the oil viscosity...
Introduction to catalytic oxidation of olefins
December 2012
The national and international circumstances of catalytic oxidation of olefins were simply introduced in this paper. And the synthesis method of catalytic oxidation of olefins are discussed in detail, such as, catalytic gas-phase oxidation of olefins; catalytic liquid-phase oxidation of olefins; catalytic oxidation of enzyme; catalytic oxidation of olefins with sodium hypochlorite and hydrogen peroxide as the...
Sensitivity analysis and determination of optimum temperature of furnace for commercial visbreaking unit
December 2012
In this study the visbreaking unit of Tehran refinery was simulated and then a parametric sensitivity analysis was carried out for determination of optimum temperature. The Petro-Sim simulator, which specializes in the simulation of refinery processes, was used in this study. Initially the simulator was validated using actual plant test runs and after tuning, the simulations provided errors less than 3%....
Chemical treatment of emulsion problem in crude oil production
December 2012
Remediation of water in the course of crude oil production has been a costly process and it has hampered the production activities in many parts of the world. In this research work, effective separation of emulsion using demulsifiers (castor oil and sulphuric acid) in six separate formulations was accessed. The result shows that using sulphuric acid as a demulsifier in 500 and 1000 revolution per minute in...
Treatment of crude-oil contaminated soil using biosurfactants
November 2012
In this research, the effect of Saponin as a bio surfactant for crude-oil removal by the concentration of 10000 and 30000 ppm in a column soil sample was evaluated. The experimental parameters and their value levels investigated were: concentration of surfactant solutions (0.05, 0.1 and 0.2%-mass); pH (7, 9 and 11); Alkali (NaOH) and polymer (Xanthan Gum) (0.6 and 0.1%-mass) and (0.7 and 0.2%-mass)...
Simulation, control and sensitivity analysis of crude oil distillation unit
November 2012
Steady-state and dynamic simulation play important roles in investigation of refinery units. Therefore, simulation can help this investigation and behavior assessment. In this paper, simulation was done by commercial software. In fact, because of solving many state equations simultaneously and using control theory, dynamic simulation has more significant impact than steady-state simulation. Flow,...
Identifying the flow dimension in fractured rock using an interference test
November 2012
The actual flow dimension in fractured rock may be between 2-D cylindrical flow and 1-D linear flow. This paper demonstrated the importance of the method used to identify the flow dimension in fractured rock correctly. A case study of a long-duration interference test was presented to illustrate the application of Barker’s type curves and to identify a flow dimension in fractured rock. It was difficult...
Effect of inertia in the study of two-phase oil-gas flow in horizontal pipelines
October 2012
The flow of oil and gas in the production pipelines is a crucial step for the oil industry, which always seeks to maximize the production of these valuable hydrocarbons. The modeling of the flow patterns allows a better analysis of the behavior of the...
Simulation of surfactant based enhanced oil recovery
April 2012
Chemical flooding is an important process for enhanced oil recovery. A substantialamount of remaining oil resides in reservoirs especially in carbonate oil reservoirs thathave low primary and waterflood oil recovery. Most of the chemical flooding studies to date have been performed in water-wet sandstone...
Numerical modelling of the fluidynamics in a bubbling fluidized bed biomass gasifier
March 2012
The fluid dynamics presented in this paper for a fluidized bed gasifier consists of estimating the volume fraction fields of gas and solid phases, as well as the velocity fields of gas and solid phases and the pressure drop inside the fluidized bed. However, understanding of the flow characteristics has an important role in understanding of the operation of the gasifier. The analyzed system consists of the...
Corrosion-erosion on waste heat recovery boiler system via blowdown optimization
March 2012
It is estimated that problems due to corrosion-erosion of boiler system cost industries billions of dollars per year. Method of corrosion-erosion control varies depending upon the type of problem encountered. This study is focused on the optimization of the boiler blowdown frequency and its effect on the chemical values of the water-steam cycle. Parameters such as conductivity, iron and silica concentrations...
Process parameters for maximum power of a proton exchange membrane fuel cell
February 2012
Pressure and temperature of the cell are the effective parameters in performance of proton exchange membrane (PEM) fuel cell. In this study, a genetic algorithm is applied to determine operating conditions that result in maximum power density of a proton exchange membrane fuel cell (PEMFC). A quasi two dimensional, isothermal model is presented for PEM fuel cell and the polarization curve of the system could...
Statistical analysis and evaluation of lithofacies from wireline logs over ‘Beleema’ field, Niger Delta, Nigeria
February 2012
A statistical analysis of well-log data for the purpose of estimating and evaluating lithofacies with depth, around ‘Beleema’ field, Niger Delta, was carried out. The principal component analysis (PCA) technique and the bulk volume water and the grain size relationships formed the main principles of analysis. The PCA was applied to selected lithology-sensitive logs, each serving as a variable...
Minimizing entropy generation for louvered fins in a plate-fin compact heat exchanger
February 2012
With distributed power generation market, the most economical solution today is to generate power through small gas turbine systems, arbitrarily categorized as microturbines (5 to 200 kW) orminiturbines (200 to 500 kW). The thermal efficiency of such microturbines is about 20% or less if no recuperator is used in the system but, using a recuperator operating at 87% effectiveness, the efficiency...
Fast combustion assisted gravity drainage (FCAGD) process for heavy oil recovery enhancement
January 2012
"Fast combustion assisted gravity drainage" (FCAGD) process is a novel heavy oil recovery enhancement method which is a specific combination of the two in-situcombustion process and steam assisted gravity drainage process. In this paper, the novel FCAGD thermal heavy oil recovery enhancement process has been presented by an improved simulation with an Eclipse500 simulator and has been...
Prediction of the enthalpy of vaporization according to the temperature far from the critical point by the group contribution method with interactions of pure hydrocarbons, simple mixtures and oil fractions
November 2011
In this research, we employed a new method to calculate vaporization enthalpy of pure hydrocarbons. This equation is a function of the temperature, far from critical point and was tested for simple mixtures and oil fractions. Comparing values with the literature, the equation established have improved results in term of average standard deviation. We also applied the equation to the oil fractions; it required...
Filter cake formation on the vertical well at high temperature and high pressure: Computational fluid dynamics modeling and simulations
November 2011
Oil and gas wells are generally drilled with the intention of forming a filter cake on the wellbore walls to primarily reduce the large losses of drilling fluid into the surrounding formation. Unfortunately, formation conditions are frequently encountered that may result in unacceptable losses of drilling fluid into the surrounding formation despite the type of drilling fluid employed and filter cake created....
Two-dimensional based method in history matching problem
October 2011
The flow of oil and gas in the production pipelines is a crucial step for the oil industry, which always seeks to maximize the production of these valuable hydrocarbons. The modeling of the flow patterns allows a better analysis of the behavior of the...
Pyrolysis behaviour and kinetics of Moroccan oil shale with polystyrene
September 2011
Pyrolysis of oil shale/polystyrene mixture was performed in a thermogravimetric analyzer (TGA) from room temperature of 1273K, at heating rates of 2, 10, 20, 50 and 100 K/min. The global mass loss during oil shale/polystyrene pyrolysis was modelled by a combination of mass-loss events for oil shale and polystyrene volatiles. TGA results indicate that mixture pyrolysis can be identified in three phases. The...
Reservoir characterization and evaluation of depositional trend of the Gombe sandstone, southern Chad basin Nigeria
September 2011
This study attempts a reservoir characterization and evaluation of depositional trend of sands to assess the petrophysical qualities of Gombe sandstone as a potential reservoir unit for hydrocarbon accumulation in the Chad basin. The economic viability in parts of the Chad basin outside Nigeria and other structurally related contiguous basins such as Doba, Doseo, Bongor fields, and Termit-Agadem basin in the...
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