首页期刊导航|石油研究（英文）
期刊信息/Journal information
石油研究（英文）
石油研究（英文）

季刊

石油研究（英文）/Journal Petroleum Research
正式出版
收录年代

    Experimental investigation of the impact of soybean oil-derived surfactant as a surface-active agent during gas well deliquification

    Gbadegesin Abioun AdeyemiKegang LingAdesina Fadairo
    489-501页
    查看更多>>摘要：The inability of the gas rate to overcome the gas critical(minimum)flow rate leads to liquid loading in a gas well.To avoid premature well shut-in,the injection of surfactants is one of the standard methods used in gas well deliquification,although many commercial surfactants pose environmental toxicity concerns.This project investigates the suitability of biosurfactants in generating foam that will reduce the surface tension of the liquid by adsorbing at the liquid-gas interface to create a more significant mass than the liquid droplets which can be easily extracted from the walls of the wellbore.An experimental setup simulating gas well conditions introduce a surfactant derived from soybean oil,subjecting it to tests for foam stability,unloading efficiency,and dynamic surface tension.The results from the modified ASTM D-892 test show that Soybean Oil Derived Surfactant(SODS)exhibits promising surface tension reduction properties and effectively alters the gas-liquid interface.With the increase in concentration from 200 ppm,400 ppm,and 600 ppm,the expelled water increased from 17％,28％,and 70％respec-tively.Similarly,Gao-Rosen adsorption isotherms confirmed SODS appropriate for the prediction of the adsorption from solution with the R2 values of approximately 1.0.This study introduces a cost-effective and environmentally friendly surfactant that performs favorably for gas well deliquification.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Reservoir identification of marine facies carbonate shoals in the Middle Permian in the Sichuan Basin

    Yunbo ZhangYan FengMiao MiaoXingying Yu...
    502-513页
    查看更多>>摘要：Controlled by the base level change cycle,the carbonates exposed from the periodically shallowed water body at the top of the high-frequency sequence develops multiple sets of thin reservoirs.Such reservoir identification has always been tricky in the prediction of carbonate reservoirs.Based on the Middle Permian strata from the Sichuan Basin,this paper established a forecasting approach of high-frequency-sequence-controlled carbonate thin reservoir.The steps are as follows:(1)Combine the measured results of samples from the typical outcrops with changes of carbon and oxygen isotopes,thus to construct a division program for the 3rd-order sequence of the Middle Permian strata.(2)Compare the carbon and oxygen isotope changes and the global sea level change trend,determine the controlling factors of the 3rd-order sequences.(3)Carry out spectrum analysis based on the natural gamma energy spectrum logging(In(Th/K))curves of Wells Long-17 and Anping-1 to establish a high-frequency sequence framework division program,and then apply the logging curve characteristics to correct the top interface positions of the high-frequency sequences,which is the potential location of carbonate reservoir.The research results suggest that the Middle Permian in the Sichuan Basin can be divided into three 3rd-order sequences,which are PSQ1,PSQ2 and PSQ3 from bottom to top.Among which,PSQ1 is mainly affected by global sea level(GSL)changes,and the changes originated from its tuning curve can be directly applied to the division of high-frequency sequences and reservoir prediction.PSQ2 and PSQ3 are jointly controlled by global sea level changes and regional tectonics.In cope with the influence of regional tectonics,the positions of the four-level sequence interface established according to the tuning curve need to be fully considered,and good results were achieved through systematical correction.This method can effectively reduce the risk of reservoir prediction caused by marine carbonate heterogeneity,and provide scientific foundation for the prediction of high-frequency cyclic reservoirs of platform facies and platform margin subfacies in other marine carbonate sedimentary basins.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Investigation of petrophysical properties of synthetic carbonate plugs:Adding a novel 3D printing approach to control pore networks

    Jhonatan Jair Arismendi FlorezCarina UlsenJean Vicente Ferrari
    514-540页
    查看更多>>摘要：The physical and chemical properties of rocks play a crucial role in understanding fluid-solid flow behavior at the pore level.Thus,studying pore space characteristics is important in evaluating and determining petrophysical properties of various rock types,including synthetic rocks,which can be designed to mimic natural rocks.This study investigates the petrophysical properties of synthetic car-bonate plugs by using a new approach that correlates the base material and a 3D printing solution with porosity and permeability.The research shows that with precise particle size and morphology,pure mineral materials such as calcite,dolomite,quartz and a non-structural Portland cement may produce a controlled rock matrix.The synthetic plugs developed in this study exhibit controlled macro,meso,and micro porosities,including fractures and vuggys,by the solubilization of materials with controlled morphology by 3D printing,which provides valuable information on regulating pore space in synthetic carbonate rocks.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Machine learning classification algorithm screening for the main controlling factors of heavy oil CO2 huff and puff

    Peng-xiang DiwuBeichen ZhaoHangxiangpan WangChao Wen...
    541-552页
    查看更多>>摘要：CO2 huff and puff technology can enhance the recovery of heavy oil in high-water-cut stages.However,the effectiveness of this method varies significantly under different geological and fluid conditions,which leads to a high-dimensional and small-sample(HDSS)dataset.It is difficult for conventional techniques that identify key factors that influence CO2 huff and puff effects,such as fuzzy mathematics,to manage HDSS datasets,which often contain nonlinear and irremovable abnormal data.To accurately pinpoint the primary control factors for heavy oil CO2 huff and puff,four machine learning classification algorithms were adopted.These algorithms were selected to align with the characteristics of HDSS datasets,taking into account algorithmic principles and an analysis of key control factors.The results demonstrated that logistic regression encounters difficulties when dealing with nonlinear data,whereas the extreme gradient boosting and gradient boosting decision tree algorithms exhibit greater sensitivity to abnormal data.By contrast,the random forest algorithm proved to be insensitive to outliers and provided a reliable ranking of factors that influence CO2 huff and puff effects.The top five control factors identified were the distance between parallel wells,cumulative gas injection volume,liquid production rate of parallel wells,huff and puff timing,and heterogeneous Lorentz coefficient.These research find-ings not only contribute to the precise implementation of heavy oil CO2 huff and puff but also offer valuable insights into selecting classification algorithms for typical HDSS data.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Recent developments,challenges,and prospects of carbon dots(CDs)for fluid flow investigation in porous media

    Mehdi RazavifarAli KhoshsimaMasoud RiaziJames J.Sheng...
    553-564页
    查看更多>>摘要：Carbon nanostructures exhibit unique physicochemical properties and play a significant role in modem and advanced technologies.Carbon dots(CDs)are a subset of carbon-based particles less than 20 nm in size.In this study,a comprehensive review was performed on the applications of CDs for fluid flow investigations in porous media.CD technology provides precious information about the heterogeneity and permeability of the rock and the existence of a sealed part between the wells in the hydrocarbon reservoir.Studying the volume and flow potential of aquifers is another application of CD in fluid flow study.CDs can be used as an additive in the fluid to modify the chemical or physical properties.Adding CD to injected fluid in the reservoir can change the rheological properties of the fluid and reduce its viscosity.CD injection as a nanofluid in the reservoir rock increases the oil recovery factor and decreases injection pressure due to the change in the wettability of rock from oil-wet to water-wet and the reduction of interfacial tension between the fluids.The mobility and performance of CDs in pore scale are related to some parameters including ionic strength,pH,pore size distribution,and type of fluids in porous media.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Chemometric analysis on concentrations and ratios of terpanes and steranes and implications for oils from the cratonic region of the Tarim Basin,NW China

    Yuanyuan BianChenxi ZhouHaizu ZhangZhongyao Xiao...
    565-585页
    查看更多>>摘要：More than 2 × 109 tonnes of proved oils have been found in the cratonic region of the Tarim Basin.The source rocks for these oils remain unresolved although the source rocks are marine facies within the Cambrian and Ordovician strata with total thickness over 5 km.So far,there is no systematic classifi-cation of these oils on the basis of source facies.In this study,a practical approach was presented to select effective and sensitive biomarker parameters for source facies and maturity assessments for the studied oils on the basis of biomarker classification by hierarchical cluster analysis(HCA).Twenty-one terpanes and steranes in oils from both the Tabei(Northern Tarim)and Tazhong(Central Tarim)uplifts were classified into three groups using HCA on the basis of terpane and sterane concentrations.The result of biomarker grouping mainly reflects the differences in thermal stabilities among biomarkers for the 45 Tabei oils,providing a general thermal stability sequence for terpanes and steranes that helps the se-lection of effective maturity parameters.However,biomarker grouping suggests that both source facies and thermal stability have major influences on relative biomarker concentrations for the 75 Tazhong oils.The Tabei oils are mainly derived from a single source with relatively homogeneous facies while the Tazhong oils are derived from multiple sources or a single source with more heterogeneous facies.Based on the HCA results,twelve terpane and sterane ratios were selected as source facies parameters for the Tabei and Tazhong oils.These studied oils were consequently classified into four families by HCA and principle component analysis(PCA)integrating the twelve selected facies parameters of terpanes and steranes along with Pr/n-C17 and Ph/n-C18 ratios.Family 1 and 2 oils are mainly in the Tabei uplift while Family 3 and 4 oils are almost in the Tazhong uplift.Family 1 and 2 oils are derived from source rocks located at the northern,central and southern areas of the Northern Depression and the Tabei Uplift with marine mudstone facies.Family 3 and 4 oils are derived from source rocks located mainly at the southern area of the Northern Depression and the Tazhong Uplift with carbonate and evaporite facies.This study provides a practical approach to trace oil origins for oil and condensate reservoirs in the Tarim Basin and elsewhere.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Foam drainage modeling of vertical foam column and validation with experimental results

    S.M.Hosseini-NasabM.RezaeeP.L.J.Zitha
    586-598页
    查看更多>>摘要：The understanding of the mechanisms behind foam generation and the structure of foam itself form the basis of foam-related experiments for its application in Enhanced Oil Recovery and overcoming gas in-jection limitations.Novel insights in this paper towards the theory of foam generation can help explain experimental results and lead to improved formulas of the applied substances and concentrations.This study aims to investigate the mechanisms behind foam generation and the structure of foam by specific laboratory experiments and theoretical analyses.The liquid drainage through interconnected Plateau borders was found to be the most critical foam decay mechanism for this particular research.The justification of the foam drainage equation was demonstrated by comparing the numerical solution with the outcome of a few bulk experiments.The discrepancies were described according to the limitations of both the theory and the experimental settings.Foam modelling gives more profound knowledge in more detail of the different stages in foam drainage than experimental data can deliver,which is because of the lack of continuous measurement of foam conductivity for the foam bulk test.Therefore,a comprehension of foam modelling investigation and comparison is required to gain a deeper understanding of foam behaviour.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Sedimentary characteristics and geological significance of a mixed-process delta for petroleum exploration in the Zhuhai formation of the Baiyun Depression,Pearl River Mouth Basin,China

    Xiaojun XieWu TangShangfeng ZhangRui Zhu...
    599-609页
    查看更多>>摘要：The Zhuhai Formation in the Baiyun Depression of the Pearl River Mouth Basin in the northern South China Sea is a marine delta influenced by multiple hydrodynamic forces,including rivers,waves,and tides,resulting in a mixed-process delta.As a result of the combined effects of these forces,the distri-bution patterns and reservoir structures in the sandstone formations of the Zhuhai Formation are extremely complex.This paper provides a detailed description of the coring section of the Zhuhai For-mation drilled in the Baiyun Depression,focusing on the lithology,sedimentary structure,special con-tainers,and depositional dynamics of the coring section.It also summarizes the characteristics of a hybrid power delta controlled by rivers,waves,and tides,and explores the geological significance of this mixed-process delta for oil and gas exploration.The study reveals that sedimentation controlled by rivers primarily consists of medium-to-fine sandstones with interbedded cross-bedding and parallel bedding.Scour-fill structures and a bell or box-shaped natural gamma ray logging curve(GR)are also observed.Seismic reflection exhibits strong amplitude and high continuity.Wave-controlled sedimentation,on the other hand,predominantly consists of silt and fine sandstones with scouring,wave-formed cross-bedding,abundant bioturbation,and a serrated and funnel-shaped GR curve.Seismic reflection shows medium amplitude and high continuity.Tidally-controlled deposits are characterized by thin interbeds of mudstone,siltstone,and fine sandstone,as well as vein laminations,undulating composite lamina-tions,lenticular laminations,and biclastic layers.The GR curves for tidally-controlled deposits are sharp or jagged with funnel shapes,and seismic reflections exhibit medium amplitude and continuity.The hydrodynamic features controlling sedimentation during the depositional period of the Zhuhai Forma-tion in the Baiyun Depression exhibit evident zonation on a planar scale,influenced by sedimentary paleogeography and sea-level changes.River control is predominant in the northern Zhuhai Formation,with local wave influence and minimal tidal influence.In the southern part,tidal action becomes increasingly important.In terms of reservoir properties,wave-controlled reservoirs display significantly better porosity and permeability compared to tidally-controlled and river-controlled reservoirs.Tidally-controlled reservoirs exhibit high heterogeneity with a wide range of porosity and permeability values.The varying influences of different hydrodynamic drivers in different locations have led to significant variations in the size,morphology,and physical properties of sand bodies within the marine delta sediments of the Zhuhai Formation in the Baiyun Depression.Thus,the type and intensity of sedimentary hydrodynamics become the primary controlling factors for the development of high-quality reservoirs.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    An experimental study of alcohol injection to mitigate water blockage in commingled layered reservoirs

    Emmanuel GyimahHamed RahnemaHamid Rahnema
    610-619页
    查看更多>>摘要：This study explores the effectiveness of alcohol injection as a stimulation treatment to mitigate water blockage in the vicinity of the wellbore.Over the years,water blockage has emerged as a recurring challenge within the oil and gas industry,leading to diminished well productivity.In a commingled reservoir with multiple layers,when a producing well is shut-in for well intervention or workover,water may encroach from water zones into the oil-bearing formations through the wellbore due to pressure differences between the layers.Water encroachment can have a significant impact on the production of a well.It can reduce the oil production rate,increase the water cut,and shorten the well's lifespan.Therefore,it is essential to take steps to mitigate the water encroachment effect in commingled reser-voirs.This study explores the use of alcohol injection to reduce transition time and remediate formation damage in commingled oil reservoirs.Limited studies have shown that alcohol has the potential to enhance fluid relative Permeability in gas condensate reservoirs and reduce condensate banking near the wellbore.However,this approach has not yet been tested in commingled oil reservoirs.A series of core flooding tests were conducted using Berea sandstone cores and a Texan light crude oil sample.The core flood setup was designed to represent the water blockage condition in the formation.Two different alcohols were tested:isopropyl alcohol(IPA)and Methanol.Experimental results showed that mutual solvents significantly reduce water blockage and shorten the transition period.However,asphaltene precipitation may become a problem with increasing the molecular weight of injected alcohol.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Influence of triton-assisted coconut shell derived graphene nanoplatelets in water-based drilling fluid lubricity and shale inhibition application

    Muftahu N.YahyaM.N.A.M.NorddinIssham IsmailA.A.A.Rasol...
    620-639页
    查看更多>>摘要：Insufficient hole cleaning,cutting suspension,clay swelling,and filtrate invasion of the formation might result from inadequate drilling mud properties.For effective drilling and wellbore stability,water-based mud(WBM)rheology,lubricity,filtration,and shale inhibition must be optimized and controlled.WBMs react with clays and cause time-dependent borehole issues,which is their principal drawback.Moreover,prolonged exposure destroys certain WBM components,resulting in minimal mud properties.These indicate the need for multifunctional additives to improve WBMs.Thus,this study developed WBM systems employing graphene nanoplatelets(GNPs)and locally acquired discarded coconut shells to overcome severe drilling challenges.By adding triton-X100 to coconut shell-based graphene(GN-CS),a greater dispersion of modified graphene(GN-TX)particles was produced.Characterization,rheology,lubricity,inhibition,and filtration tests were performed on these GN-CS and GN-TX at concentrations of 0.125,0.25,0.375,and 0.50 wt％.Furthermore,biotoxicity,biodegradability,and heavy metal content experiments were performed to study the environmental impact of GN-CS and GN-TX.The results showed that GN-TX had good thermal resistance up to 300 ℃ with only a 10％loss in weight.Both EDX and FTIR tests showed that the epoxy,carboxyl,and hydroxyl groups are in the GNP-based materials'basal plane.The GN-CS and GN-TX had better fluid properties,including better lubricity,rheology,filtration,and inhibition over the base mud,and the optimal rheological model of the drilling muds was the Herschel Buckley model.The GN-TX(modified)decreased the fluid loss to 20.6-14.3 mL from 24.6 mL at 353 K,whereas the GN-CS(unmodified)reduced it to 21.3-16.7 mL.GN-TX and GN-CS decreased the coefficient of friction of WBM from 0.47 to 0.55 to 0.25-0.41 and 0.33-0.44,respec-tively,from 298 to 353 K.In addition,0.50 wt％of GN-CS and GN-TX reduced the shale pellet swelling height to 5.4％and 5.6％,respectively,from 8.8％.Moreover,the EC50 values for GN-CS and GN-TX were about 54,000 mg/L and the BOD/COD ratio was about 47％.These results show that the GNP-based products are safe and biodegradable.The GNP-based materials have promising prospects for drilling in environmentally sensitive formations.
      原文链接:
    • NETL
    • NSTL
    • 万方数据