Abstract Nickel nanoparticles was supported on sawdust carbon via a hydrothermal method followed by calcination and used as a catalyst for heavy crude oil upgrading experiment. The performance of catalyst on catalytic pyrolysis of heavy crude oil was studied by laboratory experiments. The experimental results showed that under the reaction conditions of 350 °C, 30 min and 0.1 wt% catalyst, the viscosity

Abstract In this research, the kinetics of CO2 hydrate formation in the presence and absence of TBAOH as a thermodynamic additive and tween as a kinetic additive is investigated. A high-pressure autoclave equipped with a rocking-cell mixer was applied to determine the effect of TBAOH and tween on the process of carbon dioxide hydrate formation. The findings of the experiments show that using TBAOH

Abstract Petroleum, contains proportions of contaminants such as sulfur, nitrogen, oxygen, and metals, such as nickel, iron, copper, sodium, and vanadium. Particularly, contaminants containing sulfur cause problems during handling, transportation, and the use of the their derivatives. This work had the goal of cracking the heavy crude oil molecules by reacting these molecules with tetralin and simultaneously

Abstract In this paper, the Hubbert fluid potential model is used to restore the fluid potential of the key reservoir forming period at the end of Paleogene in Shijiazhuang Sag. At the end of Paleogene, the high potential area of Shijiazhuang Sag is mainly located in the Western trough belt of the sag, which is the main flow supply area. The low potential area of the sag is mainly distributed in the

Abstract In this study, characterization processes have been done by synthesizing the nano-aerosil-reinforced polyester composite. Chemical bonds formed in polyester composites were examined with FTIR spectrum and thermal stability with proportional integral derivative (PID) system. With the PID system, the drying kinetics of nano-polyester composites were examined from room temperature to 378 K, and

Abstract Acidification as an effective means of reservoir modification, it is necessary to investigate the influence of acid on the mechanical properties and fracture initiation and extension of oil shale. We conducted acidification test using hydrochloric acid, and performed numerical simulation and multi-factor analysis for hydraulic fracturing. Results show that acidification greatly reduced the

Abstract The aim of this study is to investigate optimization of biodiesel production process and the effects of biodiesel–diesel fuel blends on engine performance and exhaust emission parameters by using response surface methodology. Transesterification method was used in biodiesel production. The importance of four process parameters namely molar ratio, catalyst amount, reaction temperature, and

Abstract Poly(1-hexene-co-maleic anhydride) derivatives containing various lengths of linear alkyl side chains (C11–C22) were experimentally evaluated as drag reduction agents in the turbulent flow of Iraqi crude oil using a circulating flow loop system. Good drag reduction performances were obtained. The results showed that the drag reduction has been influenced by the flow rate, concentration, chemical

(2021). Correction. Petroleum Science and Technology. Ahead of Print.

Abstract A microscale heterogeneity quantification methodology is presented, which uses petrographic image analysis with multiscale simulation. Petrographic images of micro-porous carbonate rocks are converted into microscale models with help of an image analysis workflow, which helps in assigning specific porosity, permeability and petro-physical properties to the microscale model. Thin section images

Abstract Experimental liquid densities of two Omani heavy oils are provided as a function of temperature. The oils contain over 98% unknown fractions with molecular weights over 600. The unknown fractions were split using gamma function and characterized with methods suited for conventional oils. In addition, a previously developed saturated liquid density correlation was modified to calculate the

Abstract The focus of this paper is on application of advance data analytics and deep machine learning methods for time series forecasting of injection/production data from subsurface hydrocarbon recovery processes. Injection and production data, from subsurface reservoir developed though implementation of water flooding recovery mechanism, is used with aim of developing a machine learning based forecasting

Abstract Faced with the increasing shortage of conventional oil, heavy oil has shown great potential. However, high viscosity of heavy oil hinder the use of traditional exploitation and transportation methods. Emulsifying viscosity reduction has been widely applied due to the advantages of excellent effect and simple process. To better guide researchers in screening and designing emulsifying viscosity

Abstract A technical and economic analysis is done from simulations of propped hydraulic fracturing in low permeability reservoirs, as tight oil, in which the production from the well varies due to different well completion, each one is evaluated to determine the greatest economic performance. Working with a defined semi-integral system from the reservoir to the wellhead and focusing on well productivity;

Abstract Brittleness index (BI) is an important parameter in evaluation of rock frackability. Two different methods are used to estimate continuous BI of Cambay Shale of Jambusar-Broach block, Cambay Basin, India, using advanced logs like ECS, Sonic Scanner (SS) and mineralogical analysis of core samples by XRD. First method is based on mineral composition using ECS log and second method is based on

Abstract The presence of heavy n-alkanes , together with CO2 and water, affects the accuracy of existing correlations used in equations of state. Moreover, they impact the performance of simulation software, resulting in flawed calculations. In this work, the most used correlations for predicting the properties of heavy n-alkanes are analyzed. Calculations were made using commercial software packages

Abstract This paper reports the synthesis of AEC-9Na and its effects as an emulsifier on viscosity reduction of heavy oils. Williamson reaction was employed to obtain the emulsifier and its thermal stability was evaluated. The results showed that AEC-9Na can withstand a temperature of 300 °C, the viscosity reduction rate can reach greater than 99%, and it has high stability to calcium and magnesium

Abstract Non-aqueous foams are much less studied than aqueous foam systems, although non-aqueous foams are important in many industries like petroleum refining. In this study, the foamability of non-aqueous systems consisting of toluene, paraffin, and asphaltenes was tested. It was found that the asphaltenes increased the foamability of the systems and that the more aromatic systems had increased foamability

Abstract The NMR of the Trinity reservoir indicate that changes in crude oil compositions result in differences in NMR characteristics. On this basis, the chemical properties of crude oil are analyzed, and two criteria affecting the NMR characteristics of crude oil with different physical properties are presented. The research shows that the chromatographic characteristics of crude oils with different

Abstract Drilling fluid design is the most vital step in drilling phase. An ideal drilling fluid apart from exhibiting good thixotropic behavior should be efficient in inhibiting the hydrates formation, suppressing shale swelling and improving mud rheology. Lately, Ionic Liquids are being used as drilling fluid additives to increase the efficiency of drilling mud. Recent research has given evidences

Abstract The Arps decline model is one of the most commonly used oil field production prediction methods. However, the predictions of Arps decline model are not ideal. In this work, we designed a method that uses long-short term memory (LSTM) network and gate recurrent unit (GRU) to predict oil production. These models use multiple data features for oil well production prediction. The designed method

Abstract Crude oil is one of the most important energy sources in the world and contains a lot of paraffin wax. At higher temperatures, paraffin wax is dissolved in crude oil in an equilibrium state. However, when the temperature is lower than the precipitation temperature of wax, paraffin wax will precipitate, crystallize, and form a three-dimensional network structure, which will have a great impact

Abstract The common scientific issue presented by lithology prediction of tight sandstone reservoirs is that most primary lithologies cannot be distinguished effectively within the classic crossplots since they universally have similar logging responses. Lithology prediction actually is an issue of pattern recognition, and has been proved its best solver currently is machine learning technique. XGBoost

Abstract The study of the relationship of in-situ stress and permeability is of great necessity to understand the formation mechanism of high-permeability coal reservoir. However, characteristics of in-situ stress and its relationship with permeability in low-rank CBM blocks of China is poorly understood. This study employs permeability and in-situ stress test experiment to analyze the vertical variation

Abstract Severe loss of drilling fluids that occurs in Xinjiang, China, increases the Non-Production Time (NPT) and the overall cost of drilling. Magnesium oxysulfate (MOS) cement as lost circulation material has the advantages of short curing time, acid-soluble property and low cost, showing great potentials to solve severe loss. In this paper, the loss treatment of adding MOS cement directly into

Abstract Drilling fluids show significant role in the success of drilling operations of oil and gas well. Lubricating and rheological properties are important for efficient drilling leading to improved oil/gas production. The current work deals with assessing the lubricating properties of 16 different water-based drilling fluids using five lubricants and scrutinizing their consequence on the rheology

Abstract This paper presents a gas-water two-phaseLaminar-Inertial-Turbulent (LIT) flow equation for watered-out gas wells, which can be solved through the incorporation of daily production, gas-water relative permeability and PVT data, and then QAOF and formation factor (Kh) are obtained. Field case study in Long Wang Miao (LWM) water-drive gas reservoir shows that for watered-out gas wells, the single-phase

ABSSTRACT This paper studies the performance of in-depth gel treatment in a heterogeneous oil reservoir. A two-dimensional numerical model considering the disproportionate permeability reduction mechanism is developed to study the effects of gel on water permeability reduction and water viscosity enhancement. To describe the in situ gel formation, kinetic equation is provided to address polymer-crosslinker

Abstract The effects of different oxygen-containing air on enhanced oil recovery were evaluated by artificial cores with low permeability in displacement experiments. The results show that with the increment of oxygen content, more crude oil could be driven at the higher temperature and pressure, but the effect of oxygen concentration on oil displacement efficiency will be opposite at lower reaction

Abstract Viscosity of mixed oil is an important parameter which is required in transportation and production processes of mixed crude oils. There is no universal and general model for prediction of viscosity of mixed oils at different conditions. Hence, developing simple, accurate and general models for prediction of mixed oil viscosity is of great importance. In this work three computer based models

Abstract In this work, the transient pressure characteristics of vertical well with multi-wing complex fractures are carried out. A semi-analytical model of a complex fracture network is developed using the discrete flexible method. The mathematical model is resolved using the Laplace domain and the Stehfest inversion algorithm is used to draw the plate curves of each stage of flow in the reservoir

Abstract Surfactant adsorption is one of the crucial issues in surfactant flooding to enhance the oil recovery factor. In this paper, we investigated the profound impact of two different surfactants on the carbonate rocks adsorption density in different temperatures. According to the results of this experiment, carbonate rocks adsorption density increased with the increase of surfactant concentrations

Abstract CO2 injection and water-alternating-gas injection are EOR methods for improving oil recovery. This paper shows Water alternating gas (WAG) and continuous gas injection experiments with CO2 in secondary recovery. Experiments were performed in sand-packed-model. The continuous gas injection experiments were conducted at 3800, 4200, 4600 and 5000 psi, then two WAG experiments was completed at

Abstract Three correlations were developed for estimation of bubble point pressure, formation volume factor at bubble point, and solution gas-oil ratio. The data gathered from laboratory PVT data of Iranian oilfields. The robustness of the developed correlations was investigated using various methods. In addition, outcomes of the correlations were compared with the reported models in the literature

Abstract In this paper, two types of machine learning, namely neuro-fuzzy inference system (ANFIS) and multilayer perceptron (MLP), have been studied to model light hydrocarbons’ solubility solvent in bitumen. The 268 number of experimental data is used in this work from different articles. The input parameters are Temperature (T), pressure (P), and molecular weight (MW) of hydrocarbons. The result

Abstract Hydrogen index, HI, and original hydrogen index, HIo, are important indicators for measuring the hydrocarbon generation potential of the source rock. Through addressing the shortcomings of existent HIo models, improved models are proposed to improve the coincidence between calculated and measured results. According to the statistics of rock pyrolysis and TOC data of 1,249 cores taken in seven

Abstract Use of pour point depressants/flow improvers is an effective strategy for alleviation of flow problems associated with wax formation in paraffinic crude oil. Biobased oilfield chemicals derived from renewables are appealing as low-cost, eco-friendly alternatives to conventional pour point depressants. Cashew nut shell liquid (CNSL) extracted from Anacardium occidentale shells was modified

Abstract Formation damage is caused by invasion of the external reactive solid or liquid fluid into the reservoir which reduces the productivity of pay zone. This study investigates the efficiency of a biodegradable product which is stem peels powder of Grewia optiva tree as noninvasive fluid additive (NIFA) in the water-based drilling fluids. All the equipment were periodically calibrated with API

Abstract By considering the long history of water injection in oil fields, we used several sandstone cores with different permeability to conduct experimental tests. The damage effect of formation permeability caused by five types of injected water based on an oilfield water quality standard (SY/T 5329-2012) was investigated. A model for water quality sensitivity to permeability was proposed, and through

Abstract Considering the low percentage of oil recovery in carbonate reservoirs, EOR methods receive more attention in these reservoirs, and smart water flooding shows some promising experimental results in carbonate rocks. Moreover, low operating cost and capital investment of water flooding compared to other chemical flooding methods, make this emerging technology more attractive for oil companies

Abstract The complexity of the crude oil makes its compositional characterization a very challenging task. As a conventional way to characterize crude oil, SARA fractionation is based on the differences between the solubility and polarity of the four fractions: Saturates, Aromatics, Resins, and Asphaltenes. In this study, we present an improved method for SARA analysis: clay/alumina chromatography

Nitrogen (N2) and carbon dioxide (CO2) gases injection yield substantially various recovery ways. Here, a one-dimensional mathematical model is applied comprising of mass balances for explaining ga...

We study particle transmission in a deviated wellbore using computational fluid dynamics simulation. The effects of some drilling parameters on particle transport are studied such as particle chara...

Comprehensive the analysis of cores, thin section, physical properties, mercury injection, and X-CT, genesis of heterogeneity of conglomerate reservoirs in Baikouquan formation of Mahu sag is studi...

Excessive water production by high temperature (>140 °C) horizontal gas wells sharply decreases productivity. To date, no effective water shutoff agent has been developed to address this problem. I...

Abstract In this work, phase-field method is used to develop a numerical model to simulate two-phase flow through a heterogeneous fractured porous medium. Various sensitivity analyses were performed to assess the impact of wettability, fracture aperture, interfacial tension, and water injection velocity on the displacement process. It was observed that the water mass imbibed into the matrix block varies

Abstract In this article, the effect of pulsating parameters on fractures extension was studied by using the cohesive element method and employed Abaqus as the platform for the simulations. The parameters such as injection rate, peak amplitude, approaching angle, in situ stress, and the natural fracture cementing strength were the focus of this study. The results of the simulations show that the fracture

Abstract This work is aimed at predicting the amount of residue coke and the temperature of operating mode of the regenerator, depending on the initial technological conditions of the process during regeneration of catalyst coked at various degrees (0.4–0.6% wt.). Numerical studies were performed using a mathematical model that takes into account the physicochemical regularities of the regeneration

Abstract A series of kinetics and combustion tube experiments were conducted to investigate the combustion characteristics and performance of in situ combustion (ISC) process for offshore heavy oils. Then, simulation studies were carried out to evaluate the performance of the ISC process in a typical offshore heavy oil reservoir. The results showed that higher heating rates resulted in a shift in the

The theory of “secondary-tertiary integrated” enhanced oil recovery (EOR) was investigated. Models and methods for estimating the secondary water-flooding recovery, tertiary chemical-flooding recovery and “secondary-tertiary integrated” EOR were established, respectively. The results indicate that the ultimate recovery factor of “secondary-tertiary integrated” EOR is greater than the aggregation of

Abstract The theory of “secondary-tertiary integrated” enhanced oil recovery (EOR) was investigated. Models and methods for estimating the secondary water-flooding recovery, tertiary chemical-flooding recovery and “secondary-tertiary integrated” EOR were established, respectively. The results indicate that the ultimate recovery factor of “secondary-tertiary integrated” EOR is greater than the aggregation

Abstract Precipitation and deposition of paraffin wax in pipelines and tubing are critical complications in the development of crude oil in oil and gas industry. Most new information on paraffin wax is dispersed in literature or exists in crania of experts like tacit knowledge. This review paper aims at disseminate the information; bridge some knowledge-gaps by giving a comprehensive review of chemistry

Abstract In this work, variations of heavy oil asphaltenes’ oxidation reactions under different conditions were investigated. By IR spectroscopy was shown a predominant destruction of occluded and adsorbed compounds in asphaltenes when using KIO3 and NaIO4 as oxidizing agents. In the case of CH3COOH/H2O2 and KMnO4 was determined the destruction of asphaltenes supermolecules with a formation of carboxyl

Abstract Formation of wax can cause increase of pressure drop, blockages in the pipelines and interference with valve and instrumentation operation that causes loss of billions of dollars. Pour point depressant (PPD) is one of the wax treatment technique used widely in oil industry to alter the crude oil properties such as viscosity, wax appearance temperature (WAT) and pour point. The performance

This research aims to explore the effects of saturates, aromatics, resins and asphaltenes (SARA) fractions on the heavy crude oil pyrolysis behavior. The results showed that resins and asphaltenes had more pyrolysis residues (22.04% and 45.66%) relative to other samples. However, no residue was found after pyrolysis reactions when the oil mixed with SARA fractions. In addition, high temperature pyrolysis

Abstract This research aims to explore the effects of saturates, aromatics, resins and asphaltenes (SARA) fractions on the heavy crude oil pyrolysis behavior. The results showed that resins and asphaltenes had more pyrolysis residues (22.04% and 45.66%) relative to other samples. However, no residue was found after pyrolysis reactions when the oil mixed with SARA fractions. In addition, high temperature

Abstract A series of experiments were performed to study the influence of initial pressures and pressure drop rates on the amount of lost gas during the coring process. The change laws of cumulative gas production and gas production rate were investigated. The proportion changes of lost gas, desorbed gas, and residual gas were analyzed. The results show that the cumulative gas production can be divided

Abstract A 12-lumped reaction network for heavy oil catalytic cracking including 54 reaction paths is established according to the catalytic cracking reaction mechanism, clean gasoline, and light olefins production. The model kinetic parameters were calculated by Runge-Kutta method and BFGS based on the data from Davison Circulating Riser lab device and Python platform. The verification of the model

Abstract This study aims to develop a grid-based smart proxy model (G-SPM) for water flooding enhancement under different injection/production scenarios. The contribution of this work is combining experimental design and data mining techniques to prepare a high-quality database and introducing a hyper-feature to incorporate flow physics into database. The proxy was constructed by training a sequential

Abstract Based on the physico-chemical regularities, the unsteady mathematical model of the diesel fuel catalytic dewaxing process was developed. The influence of the raw materials composition and flow rate on the catalyst deactivation degree, product output and cold filter plugging point was shown. It was established, that while producing low-freezing diesel fuel, the higher the aromatic content in