SPE Journal最新文献

{"title":"Adsorption Characteristics of CO2/CH4/H2S Mixtures in Calcite Nanopores with the Implications for CO2 Sequestration","authors":"Zhenhua Rui, Cheng Qian, Yueliang Liu, Yang Zhao, Huazhou Andy Li, Andrey Afanasyev, Farshid Torabi","doi":"10.2118/219463-pa","DOIUrl":"https://doi.org/10.2118/219463-pa","url":null,"abstract":"<p>Injecting CO<sub>2</sub> into reservoirs for storage and enhanced oil recovery (EOR) is a practical and cost-effective strategy for reducing carbon emissions. Commonly, CO<sub>2</sub>-rich industrial waste gas is used as the CO<sub>2</sub> source, whereas contaminants such as H<sub>2</sub>S may severely impact carbon storage and EOR via competitive adsorption. Hence, the adsorption behavior of CH<sub>4</sub>, CO<sub>2</sub>, and H<sub>2</sub>S in calcite (CaCO<sub>3</sub>) micropores and the impact of H<sub>2</sub>S on CO<sub>2</sub> sequestration and methane recovery are specifically investigated. The Grand Canonical Monte Carlo (GCMC) simulations were applied to study the adsorption characteristics of pure CO<sub>2</sub>, CH<sub>4</sub>, and H<sub>2</sub>S, and their multicomponent mixtures were also investigated in CaCO<sub>3</sub> nanopores to reveal the impact of H<sub>2</sub>S on CO<sub>2</sub> storage. The effects of pressure (0–20 MPa), temperature (293.15–383.15 K), pore width, buried depth, and gas mole fraction on the adsorption behaviors are simulated. Molecular dynamics (MD) simulations were performed to explore the diffusion characteristics of the three gases and their mixes. The amount of adsorbed CH<sub>4</sub>, CO<sub>2</sub>, and H<sub>2</sub>S enhances with rising pressure and declines with rising temperature. The order of adsorption quantity in CaCO<sub>3</sub> nanopores is H<sub>2</sub>S > CO<sub>2</sub> > CH<sub>4</sub> based on the adsorption isotherm. At 10 MPa and 323.15 K, the interaction energies of CaCO<sub>3</sub> with CO<sub>2</sub>, H<sub>2</sub>S, and CH<sub>4</sub> are −2166.40 kcal/mol, −2076.93 kcal/mol, and −174.57 kcal/mol, respectively, which implies that the order of adsorption strength between the three gases and CaCO<sub>3</sub> is CO<sub>2</sub> > H<sub>2</sub>S > CH<sub>4</sub>. The CH<sub>4</sub>-CaCO<sub>3</sub> and H<sub>2</sub>S-CaCO<sub>3</sub> interaction energies are determined by van der Waals energy, whereas electrostatic energy predominates in the CO<sub>2</sub>-CaCO<sub>3</sub> system. The adsorption loading of CH<sub>4</sub> and CO<sub>2</sub> are lowered by approximately 59.47% and 24.82% when the mole fraction of H<sub>2</sub>S is 20% at 323.15 K, reflecting the weakening of CH<sub>4</sub> and CO<sub>2</sub> adsorption by H<sub>2</sub>S due to competitive adsorption. The diffusivities of three pure gases in CaCO<sub>3</sub> nanopore are listed in the following order: CH<sub>4</sub> > H<sub>2</sub>S ≈ CO<sub>2</sub>. The presence of H<sub>2</sub>S in the ternary mixtures will limit diffusion and outflow of the system and each single gas, with CH<sub>4</sub> being the gas most affected by H<sub>2</sub>S. Concerning carbon storage in CaCO<sub>3</sub> nanopores, the CO<sub>2</sub>/CH<sub>4</sub> binary mixture is suitable for burial in shallower formations (around 1000 m) to maximize the storage amount, while the CO<sub>2</sub>/CH<sub>4</sub>/H<sub>2</sub>S ternary mixture sho","PeriodicalId":22252,"journal":{"name":"SPE Journal","volume":"68 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141062739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A New Mechanistic Model for Wettability-Altering Surfactant Floods in Carbonates","authors":"Yue Shi, Kishore K. Mohanty, Juliana Y. Leung, Qing You","doi":"10.2118/219468-pa","DOIUrl":"https://doi.org/10.2118/219468-pa","url":null,"abstract":"<p>Surfactants and low-salinity brines have been shown to be effective for enhanced oil recovery in carbonate rocks through wettability alteration (WA). Oil wettability of carbonates is ascribed to the adsorbed organic acid components in oil. The removal of the adsorbed acids leads to WA. Previous experiments with wettability-altering surfactants have shown the following: WA is a slow process; acid removal is irreversible in most cases; surfactants can access the rock surface in water-wet regions and at three-phase contact lines rather than the entire rock surface; surfactant molecules become inactive after interactions with acids. Existing models/simulators do not incorporate the aforementioned observations. In this work, a multiphase, multicomponent, finite-difference reservoir simulator incorporating a new mechanistic model for WA was developed. The model captures the key physicochemical reactions between adsorbed acids and surfactant molecules and honors the four experimental evidences. The model was first tested at the core scale. The simulation results demonstrated that the model can accurately predict waterflood performance in rocks with various wettability. It can also effectively account for the influence of injection rates in surfactant flood experiments. The effectiveness of the surfactant, controlled by an interaction constant in the model, was found to be a dominant factor. The model was also tested for field-scale pilot tests. The results revealed that total quantity of chemicals injected and the injection rate have a more pronounced effect on oil recovery compared to the timing of surfactant treatment and the concentration of surfactant slug.</p>","PeriodicalId":22252,"journal":{"name":"SPE Journal","volume":"15 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141062861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance Analysis of the Vortex Cuttings Cleaner: Turbine Hydraulic Drive and Cuttings Transport in Wellbore Annulus","authors":"Yiqun Zhang, Zhaowen Hu, Qi Wang, Haochen Huang, Ya Liu, Wei Wang","doi":"10.2118/219462-pa","DOIUrl":"https://doi.org/10.2118/219462-pa","url":null,"abstract":"<p>In the process of directional and horizontal well drilling, cuttings tend to settle and form a bed at the low side of the annulus due to gravity, which decreases the drilling rate and even causes accidents in severe cases. This paper analyzes the performance of a new tool, the vortex cuttings cleaner, which can be effective without rotation of the drillpipe. Based on the computational fluid dynamics (CFD) approach, together with the discrete phase, Euler, and dynamic mesh models, the vortex cuttings cleaner is investigated with respect to the turbine torque, turbine velocity, pressure drop, and cuttings transport in the annulus. The working mechanism of the vortex cuttings cleaner is clarified. Finally, field tests are conducted on the tool to evaluate its application in terms of service life, wellbore friction, and rate of penetration (ROP). The results show that the turbine can rotate continuously under hydraulic drive. The turbine torque/velocity and the tool’s pressure drop increase with increasing displacement. The cuttings transport in the annulus is jointly affected by factors such as turbine velocity, fluid velocity, and particle size. A too low or high turbine velocity is unfavorable for cuttings transport. Through the analysis of the number of particles and particle concentration, the optimal velocity is determined to be 125 rev/min. The swirling flow intensity in the annulus flow field increases with the increase in turbine velocity. Field applications suggest a service life longer than 200 hours, a notable decrease in wellbore friction, and an average increase in ROP by more than 20%. This study provides a theoretical basis for the research on wellbore cleaning tools.</p>","PeriodicalId":22252,"journal":{"name":"SPE Journal","volume":"48 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141062821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plugging Mechanism of Rigid and Flexible Composite Plugging Materials for Millimeter-Scale Fractures","authors":"Yingrui Bai, Yuan Liu, Jinsheng Sun, Kaihe Lv","doi":"10.2118/218401-pa","DOIUrl":"https://doi.org/10.2118/218401-pa","url":null,"abstract":"<p>Drilling-fluid loss caused by millimeter-scale fractures is a notoriously difficult problem in drilling engineering, and both rigid and flexible plugging materials are commonly used to address this issue. This investigation aims to comprehensively explore the plugging efficacy and underlying mechanisms of rigid, flexible, and fiber materials when used individually and in combination. The findings of our investigations into macroscopic high-temperature and high-pressure plugging experiments divulge a revelation: Under conditions of enhanced concentration, rigid particles evince the remarkable ability to engender a pressure-enduring plugging stratum; in contrast, independent attempts by flexible and fiber materials to yield a stable plugging layer are challenging. In this context, the optimal ratio of rigid, flexible, and fiber materials has been determined through composite plugging experiments. Calcite particles with a concentration of 5–8%, rubber particles with a concentration of 2–3%, and polypropylene fibers with a concentration of 1–2% were compounded for fracture plugging with widths of 1 mm, 3 mm, and 5 mm, respectively. The resulting plugging strengths were 10 MPa, 9 MPa, and 7 MPa. The microscopic visualized plugging experiments showed that the rigid particles form an I-shaped plugging layer with high strength but are difficult to transport to the deep part of the fracture. Flexible particles can be transported into the deep part of the fracture to form a plugging layer, but the “V”-shaped formation is unstable and has low strength. Based on the experimental results of “rigid-flexible synergistic” composite bridging-plugging formulations for different scales of fractured strata, the preferred template for bridging-plugging material formulations in the field is investigated to provide a reference for the bridging-plugging material formulations in the field.</p>","PeriodicalId":22252,"journal":{"name":"SPE Journal","volume":"281 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140581207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Optimization Analysis of the Melt-Cutting Diversion Jetting Mechanism for Downhole Drilling Columns","authors":"Jun Jing, Xirui Luo, Xiaohua Zhu, Yang Peng, Hongbin Shan","doi":"10.2118/218400-pa","DOIUrl":"https://doi.org/10.2118/218400-pa","url":null,"abstract":"<p>Molten metal jet cutting, based on the transient superexothermic characteristics of aluminum thermal reaction, presents a novel technology for swiftly cutting and disposing of stuck drilling columns in downhole oil and gas wells. The key to achieving efficient cutting in drilling columns lies in the jetting mechanism, which guides the high-speed radial ejection of aluminum thermal reaction products that act upon the metal pipe wall. This study uses computational fluid dynamics (CFD) simulation to establish a fluid domain model for the process of cutting molten drilling columns. The optimization of the jetting mechanism is conducted to improve the circumferential coverage by the molten metal by analyzing the impact of molten metal yield and jetting mechanism parameters (cone angle of the conical conductor, diameter, number and length of nozzles, and shape of the diverter). Finally, an ejection test is carried out to verify the optimized jetting mechanism. Research results show that increasing the cone angle of the conical conductor can increase the flow rate of the molten metal at the upper end of the axial nozzle assembly to smoothly discharge the molten metal. Increasing the number of nozzles with equal diameters can increase the circumferential distribution range of molten metal ejected into the cutting area. However, the molten metal circumferential coverage will be impacted by increasing cutting distance. Increasing the nozzle size can reduce the divergence of the molten metal, thereby improving the coverage of the molten metal in the cutting area. When the nozzle arc length <em>L</em> = 8 mm, the molten metal can cover almost the entire cutting area. Adding a 2-mm horizontal draining table at the end of the diverter can assist the molten metal in changing its flow direction, allowing the molten metal to be ejected in a radial direction. The research results provide a theoretical basis for optimizing fusion cutting tools and formulating cutting processes.</p>","PeriodicalId":22252,"journal":{"name":"SPE Journal","volume":"22 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141062853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Environmentally Friendly Rosin-Modified Silica Nanocomposite as High-Performance Plugging Agent for Drilling in Nano-Microporous Formations","authors":"Ming Lei, Jinsheng Sun, Weian Huang, Haiyan Zhu","doi":"10.2118/218407-pa","DOIUrl":"https://doi.org/10.2118/218407-pa","url":null,"abstract":"<p>The increasingly severe wellbore instability problem and the intensified environmental requirements necessitate the development of high-performance and environmentally friendly plugging materials for drilling fluid. In this work, a novel core-shell nanocomposite (PDSA) with nano-silica (nano-SiO₂) as the rigid core and hydrophobic resin derived from dehydroabietic acid (DHAA) of pine rosin and crosslinked hydrophilic layer of 2-acrylamido-2-methyl-1-propanesulfonic acid and <em>N</em>, <em>N</em>-dimethylacrylamide (DMA) as the polymer shell was synthesized through semi-continuous emulsion polymerization. The molecular structure of PDSA was confirmed by proton nuclear magnetic resonance and Fourier transform infrared spectra analysis. Particle-size distribution and morphology measured by dynamic light scattering, scanning electron microscopy, and transmission electron microscopy revealed that PDSA was a monodisperse nanosphere with a particle size of around 98 nm, with a core-shell structure and possessed excellent long-term colloidal dispersion stability. The nano-microporous plugging performance of PDSA was evaluated using tight sandstone cores, shale cuttings, and filter membranes (200–400 nm) as plugging media. The results showed that PDSA could form effective aggregated plugging zones in nano-micropores and fractures in sandstone core and shale samples, lowering the core permeability by 78% and improving the shale recovery to above 80%, superior to conventional plugging agents of nano-polyester (NP) and sulfonated asphalt. PDSA also effectively minimized the nano-micropore fluid loss for filter membranes under high-temperature and high-pressure (HTHP) conditions. Furthermore, based on the response surface methodology (RSM) design, the established statistical significant prediction model for HTHP nano-microporous fluid loss indicated the main controlling factor of temperature and its interactive effects with PDSA dosage and membrane size. The high-temperature-induced deformation of PDSA in conjunction with the rigid core was conducive to enhancing and maintaining the HTHP plugging effect within 180°C. The plugging mechanism of PDSA was revealed to be the core-shell synergistic plugging effects of the interparticle bridging and gap filling of the rigid core and the adhesive film forming of the rosin resin shell. The study might provide a novel strategy for preparing high-performance and eco-friendly nano-plugging agents from natural rosin to maintain wellbore stability and relieve environmental pressure, especially for applications in the deep shale and tight formations associated with high-temperature and nano-microporous harsh conditions and the environmentally sensitive areas.</p>","PeriodicalId":22252,"journal":{"name":"SPE Journal","volume":"2015 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140581200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interpretable Lost Circulation Analysis: Labeled, Identified, and Analyzed Lost Circulation in Drilling Operations","authors":"Yongcun Feng, Heng Yang, Xiaorong Li, Shuai Zhang, Han Hu, Jinshu Wang","doi":"10.2118/218380-pa","DOIUrl":"https://doi.org/10.2118/218380-pa","url":null,"abstract":"\u0000 Lost circulation (LC) is a serious problem in drilling operations, as it increases nonproductive time and costs. It can occur due to various complex factors, such as geological parameters, drilling fluid properties, and operational drilling parameters, either individually or in combination. Therefore, studying the types, influencing factors, and causes of LC is crucial for effectively improving prevention and plugging techniques. Currently, the expert diagnosis of LC types relies heavily on the experience and judgment of experts, which may lead to inconsistencies and biases. Additionally, difficulties in obtaining data or missing important data can affect the efficiency and timeliness of diagnosis. Traditional physical modeling methods struggle to analyze complex factor correlations, and conventional machine learning techniques have limited interpretability. In this paper, we propose an interpretable lost circulation analysis (ILCA) framework that provides a new method for analyzing LC. First, we use Gaussian mixture model (GMM) clustering to analyze the LC characteristics of regional case data, efficiently and accurately labeling 296 LC events. Second, we establish the relationship between geological features, drilling fluid properties, operational drilling parameters, and LC types using the XGBoost algorithm. This enables timely identification of LC types during drilling operations using real-time data, with a precision greater than 85%. Finally, we use interpretable machine learning techniques to conduct a comprehensive quantitative analysis of influencing factors based on the established XGBoost model, providing a clear explanation for the identification model. This enables drilling engineers to gain deeper insights into the factors influencing LC events. In summary, the proposed ILCA framework is capable of efficiently labeling LC types based on regional case data, identifying LC types in a timely manner using real-time data, and conducting quantitative analysis of the factors and causes of LC. This approach addresses the limitations of traditional methods and offers valuable insights for drilling engineers.","PeriodicalId":22252,"journal":{"name":"SPE Journal","volume":"14 19","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139457403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Study of Seismic Wave Attenuation in Carbonate Rocks","authors":"F. Bouchaala, Mohammed Y. Ali, Jun Matsushima, Mohamed Soufiane Jouini, A. A. Mohamed, Syed Nizamudin","doi":"10.2118/218406-pa","DOIUrl":"https://doi.org/10.2118/218406-pa","url":null,"abstract":"\u0000 Seismic wave attenuation has a great potential for studying saturated and fractured media, due to its high sensitivity to the physical properties of geological media. However, accurately estimating this parameter can be challenging due to its sensitivity to signal noise, particularly in heterogeneous media such as carbonate rocks. This explains the paucity of attenuation studies carried out in carbonate rocks compared with sandstones, and the ambiguity around its mechanisms and its relationship with petrophysical properties. To investigate further, we conducted an experimental study of ultrasonic waveform signals (0.5–3 MHz) reordered under dry and fully saturation conditions in 13 samples covering a wide range of petrophysical values and subjected them to differential pressure reaching reservoir pressure. The resulting increase in attenuation magnitudes and their variation with pressure due to brine saturation were more pronounced than in velocity magnitudes, confirming the higher sensitivity of attenuation to fluid content. However, understanding the relationship between attenuation and petrophysical properties required a careful examination of the results and more elucidation about attenuation mechanisms. We suggested that multiple attenuation mechanisms coexist, including scattering, cracks slipping, solid frictional relative motion, and global and squirt flow. This explains the frequency dependence of attenuation, with higher magnitudes at sonic frequencies, where the squirt flow mechanism may be dominant. In contrast to sandstone, the magnitude of compressional to shear attenuation ratio (QP−1/QS−1) was found to be greater than unity in both dry and brine fully saturated carbonate samples at ultrasonic frequencies. This result may be due to the complex porosity structure of carbonate rocks, which makes it not appropriate to the sandstone rock physics models.","PeriodicalId":22252,"journal":{"name":"SPE Journal","volume":"12 12","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139457118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Design of Hydrogen Saline Aquifer Storage Processes Using a Machine-Learning Assisted Multiobjective Optimization Protocol","authors":"Qian Sun, Miao Zhang, Turgay Ertekin","doi":"10.2118/218405-pa","DOIUrl":"https://doi.org/10.2118/218405-pa","url":null,"abstract":"\u0000 The global effort toward decarbonization has intensified the drive for low-carbon fuels. Green hydrogen, harnessed from renewable sources such as solar, wind, and hydropower, is emerging as a clean substitute. Challenges due to the variable needs and instable green hydrogen production highlight the necessity for secure and large-scale storage solutions. Among the geological formations, deep saline aquifers are noteworthy due to their abundant capacity and ease of access. Addressing technical hurdles related to low working gas recovery rates and excessive water production requires well-designed structures and optimized cushion gas volume. A notable contribution of this study is the development of a multiobjective optimization (MOO) protocol using a Kalman filter-based approach for early stopping. This method maintains solution accuracy while employing the MOO protocol to design the horizontal wellbore length and cushion gas volume in an aquifer hydrogen storage project and accounting for multiple techno-economic goals. Optimization outcomes indicate that the proposed multiobjective particle swarm (MOPSO) protocol effectively identifies the Pareto optimal sets (POSs) in both two- and three-objective scenarios, requiring fewer iterations. Results from the two-objective optimization study, considering working gas recovery efficacy and project cost, highlight that extending the horizontal wellbore improves hydrogen productivity but may lead to unexpected fluid extraction. The three-objective optimized hydrogen storage design achieves a remarkable 94.36% working gas recovery efficacy and a 59.59% reduction in water extraction. The latter represents a significant improvement compared to the reported literature data.","PeriodicalId":22252,"journal":{"name":"SPE Journal","volume":"22 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139455237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Investigation of Solids Production Mechanisms in a Hydraulic Screen-Through Fracturing Well in a Loose Reservoir and Its Control","authors":"Saifula Dilimulati, Changyin Dong, Xinjie Zhan, Jingwei Li, Guoliang Cui, Quangang Liu, Haobin Bai","doi":"10.2118/218414-pa","DOIUrl":"https://doi.org/10.2118/218414-pa","url":null,"abstract":"\u0000 Successful cases of hydraulic screen-through fracturing (HSTF) in the Bohai oil field highlight the possibility that hydraulic fracturing can be an alternative method for enhancing the productivity of loose reservoirs. However, a portion of the HSTF wells in the Bohai oil field suffer from severe solids production, meaning that proppants and stratum sands are produced in the wellbore during production and cause wellbore plugging and ensuing debilitation of productivity. In this study, fluid flow amid the stratum, fracture, and HSTF well is simulated experimentally, and pressure drop, flow rate of the fracture, and stratum are monitored to investigate mechanisms and influencing factors of solids production from HSTF wells. Perspectives on solids control optimization are put forward for the Bohai oil field. Results indicate that the formation of an erosion cavity on lip-sealing in fracture and a dominant fluid channel near the wellbore in the stratum are two main mechanisms of solids production. The higher the flow rate and fluid viscosity are, the more severe solids production can be. For the Bohai oil field, with 725-psi-strength resin-coated proppant, the minimum proportion of resin-coated proppant in fractures to prevent solids production can be reduced from the previous 65% to 30%. With 1,073-psi-strength resin-coated proppant, it can be further reduced to 20%. Reducing the proportion of resin-coated proppant can help optimize the conductivity of fractures. This study aims to provide preliminary insight on solving the solids production problem of an HSTF well, thus enhancing the applicability of hydraulic stimulation in loose reservoirs.","PeriodicalId":22252,"journal":{"name":"SPE Journal","volume":"121 49","pages":""},"PeriodicalIF":3.6,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139453817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}