Proceedings 56th US Rock Mechanics / Geomechanics Symposium最新文献_第4页

A coupled hydro-mechanical model for simulation of two-phase flow and geomechanical deformation in naturally fractured porous media 模拟天然裂缝多孔介质中两相流动和地质力学变形的水-力耦合模型

Proceedings 56th US Rock Mechanics / Geomechanics Symposium Pub Date : 2022-06-26 DOI: 10.56952/arma-2022-0493

Lijun Liu, Yongzan Liu, Xiaoguang Wang, J. Yao

{"title":"A coupled hydro-mechanical model for simulation of two-phase flow and geomechanical deformation in naturally fractured porous media","authors":"Lijun Liu, Yongzan Liu, Xiaoguang Wang, J. Yao","doi":"10.56952/arma-2022-0493","DOIUrl":"https://doi.org/10.56952/arma-2022-0493","url":null,"abstract":"This paper presents a coupled fluid flow and geomechanics model for analysis of two-phase flow and deformation behaviors in naturally fractured porous media. The discrete fracture model (DFM) is used to model two-phase fluid flow. The zero-thickness interface element method coupled with a modified Barton-Bandis’s constitutive model is applied to model the mechanical behavior of natural fractures. The finite volume (FVM) and finite element (FEM) methods are used for the discretization of flow and geomechanical equations, respectively. The coupled problem is iteratively solved using the fixed-stress splitting algorithm. Then the proposed model is applied to investigate the two-phase fluid flow in fractured porous media under various in-situ stress conditions. The results show that fracture aperture significantly increases as the differential stress increases due to shear dilation, which accordingly enhances the equivalent permeability of the fractured medium. Channelized flow is formed through the dilated fractures, which results in early water breakthrough and reduces the water sweep efficiency. This study illustrates the importance of shear dilation on two-phase flow behaviors in fractured porous media and highlights the necessity of considering shear dilation for accurate prediction of saturation distributions. The simulations also demonstrate the capacity of our model to capture the complex coupled behavior induced by the interaction between pore pressure and in-situ stress loadings.","PeriodicalId":418045,"journal":{"name":"Proceedings 56th US Rock Mechanics / Geomechanics Symposium","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115165039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Technical Assessments of Horizontal Drilling with Multistage Fracturing to Increase Production from Hassi Tarfa Field, Algeria 阿尔及利亚Hassi Tarfa油田水平井多级压裂增产技术评价

Proceedings 56th US Rock Mechanics / Geomechanics Symposium Pub Date : 2022-06-26 DOI: 10.56952/arma-2022-0523

Ala Eddine Aoun, V. Rasouli, Youcef Khetib, Atir Kaunain, Olivia Kost, Abdelhakim Khouissat

{"title":"Technical Assessments of Horizontal Drilling with Multistage Fracturing to Increase Production from Hassi Tarfa Field, Algeria","authors":"Ala Eddine Aoun, V. Rasouli, Youcef Khetib, Atir Kaunain, Olivia Kost, Abdelhakim Khouissat","doi":"10.56952/arma-2022-0523","DOIUrl":"https://doi.org/10.56952/arma-2022-0523","url":null,"abstract":"Unconventional resources have become the core business of many petroleum companies to meet the increasing demand for energy. Several technologies and methods have been developed and deployed to unlock the potential of tight and ultra-tight formations. Hassi Tarfa (HTF) oil field is a thin and tight sandstone reservoir in Algeria, with an average permeability of less than 0.5 mD. However, all drilled wells in this field are vertical. Hydraulic Fracturing (HF) is the prime stimulation technique that is applied to increase oil recovery in unconventional reservoirs. Although the well production tremendously increases after fracking operation, it does not sustain for longer period of time, which keeps the estimated ultimate recovery (EUR) to be relatively low. In this study, a reservoir model was built and history matched, in order to consider three scenarios to optimize the horizontal lateral length in the HTF field. Then, multistage HF design was simulated using advanced 3D finite element software and exported to the model to estimate the potential increase of EUR. Sensitivities on number of HF stages, fluid volumes, and proppant were conducted to identify the optimal number of HF stages. The results of this study showed that, employing multistage hydraulic fracturing along horizontal drilling can significantly improve the oil recovery in HTF formation. Fracture length and the number of stages showed to be important design parameters. This study also identified the optimal range of operational parameters such as pumping schedule, proppant mass and perforation interval which are crucial to the cost reduction and operation efficiency.","PeriodicalId":418045,"journal":{"name":"Proceedings 56th US Rock Mechanics / Geomechanics Symposium","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124299765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relationship between macroporosity and Young’s modulus through UCS tests on rock and analogue models, and numerical modeling – a literature review 岩石UCS试验与模拟模型及数值模拟研究宏观孔隙度与杨氏模量的关系——文献综述

Proceedings 56th US Rock Mechanics / Geomechanics Symposium Pub Date : 2022-06-26 DOI: 10.56952/arma-2022-0131

N. Hudyma, B. Avar

引用次数: 1

How grooves can improve casing tripping-out from cemented borehole 沟槽如何改善固井井中套管的起下钻

Proceedings 56th US Rock Mechanics / Geomechanics Symposium Pub Date : 2022-06-26 DOI: 10.56952/arma-2022-2179

Xiyang Xie, J. D. Ytrehus, A. Taghipour, Raghavendra B. Kulkarni

引用次数: 0

EGS Stimulation Design with Uncertainty Quantification at the EGS Collab Site 基于不确定度量化的EGS增产设计

Proceedings 56th US Rock Mechanics / Geomechanics Symposium Pub Date : 2022-06-26 DOI: 10.56952/arma-2022-0723

J. Burghardt, H. Knox, T. Doe, D. Blankenship, P. Schwering, M. Ingraham, Timothy J Kneafsey, P. Dobson, C. Ulrich, Y. Guglielmi, W. Roggenthen

{"title":"EGS Stimulation Design with Uncertainty Quantification at the EGS Collab Site","authors":"J. Burghardt, H. Knox, T. Doe, D. Blankenship, P. Schwering, M. Ingraham, Timothy J Kneafsey, P. Dobson, C. Ulrich, Y. Guglielmi, W. Roggenthen","doi":"10.56952/arma-2022-0723","DOIUrl":"https://doi.org/10.56952/arma-2022-0723","url":null,"abstract":"Engineering a robust hydraulic connection between wells is one of the most difficult aspects of enhanced geothermal systems (EGS). Designing and constructing such hydraulic connections requires an understanding of the in-situ state of stress and the heterogeneities and discontinuities that naturally exist and may control the stimulation. Even with comprehensive stress and formation characterization programs, substantial uncertainty remains in these key parameters. This is especially the case in high-temperature EGS environments where drilling conditions are often difficult and far fewer logging and testing options are available. This paper presents a new approach for explicitly quantifying the uncertainties in the state of stress using a Bayesian Markov Chain Monte Carlo method. This approach produces a probability distribution for the stress tensor, including a general 3D orientation, that reflects the uncertainties in all the observations or indicators used to constrain the stress state. This method is demonstrated using the characterization data for the EGS Collab Experiment 2 site. The output of the analysis is used to guide the design of the planned stimulations. In the case of research projects like EGS Collab, explicitly quantifying the uncertainties in the stress state allows for more rigorous hypothesis testing by allowing conclusions drawn from the experiments to be interpreted in the context of the uncertain knowledge about conditions in the test bed.","PeriodicalId":418045,"journal":{"name":"Proceedings 56th US Rock Mechanics / Geomechanics Symposium","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114641954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mapping and Characterization of Rockfall Runout Talus Deposits from Columnar Basalt Cliffs in Boise, ID 爱达荷州博伊西柱状玄武岩悬崖上的落石跳动Talus矿床的制图和表征

Proceedings 56th US Rock Mechanics / Geomechanics Symposium Pub Date : 2022-06-26 DOI: 10.56952/arma-2022-0132

N. Hudyma, N. Walker, B. Chittoori

引用次数: 0

Influence of mechanical deformation and mineral dissolution/precipitation on reservoir thermal energy storage 力学变形和矿物溶解/沉淀对储层蓄热的影响

Proceedings 56th US Rock Mechanics / Geomechanics Symposium Pub Date : 2022-06-26 DOI: 10.56952/arma-2022-0083

Wencheng Jin, P. Dobson, C. Doughty, N. Spycher, T. McLing, G. Neupane, Robert W. Smith, T. Atkinson

{"title":"Influence of mechanical deformation and mineral dissolution/precipitation on reservoir thermal energy storage","authors":"Wencheng Jin, P. Dobson, C. Doughty, N. Spycher, T. McLing, G. Neupane, Robert W. Smith, T. Atkinson","doi":"10.56952/arma-2022-0083","DOIUrl":"https://doi.org/10.56952/arma-2022-0083","url":null,"abstract":"Reservoir thermal energy storage (RTES) is a promising technology to balance the mismatch between energy supply and demand. In particular, high temperature (HT) RTES can stabilize the grid with increasing penetration of renewable energy generation. This paper presents the investigation of the mechanical deformation and chemical reaction influences on the performance of HT-ATES for the Lower Tuscaloosa site. Thermo-hydraulic (TH), thermo-hydro-mechanical (THM), and thermo-hydro-chemical (THC) coupled simulations were performed with different operational modes and injection rates for a fixed five-spot well configuration and a seasonal cycle. The results show that (1) geomechanical-induced porosity change is mainly contributed by effective stress change, and the porosity change is distributed through the whole system; (2) geochemistry-induced porosity change is located near the hot well, and its change is one order of magnitude higher than the geomechanical effect; (3) both the operation mode and the injection rate have a huge influence on the RTES performance and lower injection rate with push-pull operation mode has the best performance with recovery factor around 70% for this RTES system. These results shed light on the deployment of HT-RTES in the US and around the world.","PeriodicalId":418045,"journal":{"name":"Proceedings 56th US Rock Mechanics / Geomechanics Symposium","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131372208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Laboratory Test on Direct Shear Behavior of Rock Joints Using a Bar Drop Impact System 用棒材跌落冲击系统进行岩石节理直接剪切性能的实验室试验

Proceedings 56th US Rock Mechanics / Geomechanics Symposium Pub Date : 2022-06-26 DOI: 10.56952/arma-2022-0734

G. Kim, Sang-Gyu Cho, Chanhwi Shin, Pureun Jeon, Seoyeong Lee, Hanlim Kim, G. Min, Juseok Yang, Kyungjae Yoon

{"title":"Laboratory Test on Direct Shear Behavior of Rock Joints Using a Bar Drop Impact System","authors":"G. Kim, Sang-Gyu Cho, Chanhwi Shin, Pureun Jeon, Seoyeong Lee, Hanlim Kim, G. Min, Juseok Yang, Kyungjae Yoon","doi":"10.56952/arma-2022-0734","DOIUrl":"https://doi.org/10.56952/arma-2022-0734","url":null,"abstract":"For an underground excavation at depth in highly stressful conditions, it is important to mitigate the risk of stress-induced failure, e.g., rockburst, and improve miner safety concerning the stability of underground workplaces and the prevention of fatalities. In general, the cause of rockburst is classified into three categories: strainburst due to stress-induced fracturing, rock ejection by seismic energy transfer, and rockfall associated with mining-induced seismicity. In this study, the Split Hopkinson Pressure Bar (SHPB) modified configuration of bar drop apparatus was developed by attaching a direct shear test box and a long bar. As a result, the modified bar drop system enabled to replicate and control of a seismic velocity that was an incident on the joint rock surfaces installed in the direct shear testing box. The long bar installed in the modified bar drop system provides a longer stress wavelength to overcome the relatively shorter duration of the stress waves in the SHPB system. The dynamic shear test on the jointed rock samples using the bar drop apparatus also provided the information to estimate the rock joint shear strengths.","PeriodicalId":418045,"journal":{"name":"Proceedings 56th US Rock Mechanics / Geomechanics Symposium","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134427417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical analyses of the granite fragmentation in rotary-percussive drilling with the consideration of pre-existing cracks 考虑预先存在裂缝的旋转冲击钻井花岗岩破碎数值分析

Proceedings 56th US Rock Mechanics / Geomechanics Symposium Pub Date : 2022-06-26 DOI: 10.56952/arma-2022-0346

Z. Ji

{"title":"Numerical analyses of the granite fragmentation in rotary-percussive drilling with the consideration of pre-existing cracks","authors":"Z. Ji","doi":"10.56952/arma-2022-0346","DOIUrl":"https://doi.org/10.56952/arma-2022-0346","url":null,"abstract":"Rotary-percussive drilling technique is an efficient rock-breaking method and can be applied in geothermal drilling. The rock's fragmentation mechanism was investigated using the distinct element method with the consideration of pre-existing cracks. We developed a cutter-rock interaction model to simulate the rotary-percussive drilling. In this model, a discrete fracture network (DFN) was used to reflect the rock's complex behavior. Bonded Block Model (BBM) was used to simulate cracks initiation that can merge and propagate to fracture the rock. As a dynamic problem, the rock's damping effect was introduced into our model by fitting it to the laboratory tests. Results represented the rock's fragmentation process under the cutter indentation and the coupling of impact load and lateral movement well. The pre-existing cracks can significantly enhance the drilling speed, which demonstrates the significance of considering the rock's non-continuous nature. Raising dynamic impact load is good for improving the penetration results in our study. For the back rake angle, 50 is the best choice in the evaluated range. But the cutter with the back rake angle of 20 obtains the highest fragmentation volume and lowest specific energy under the coupling of impact load and lateral velocity. This paper's research is of great significance to guide the application of rotary-percussive drilling and reduce the cost of developing geothermal resources.","PeriodicalId":418045,"journal":{"name":"Proceedings 56th US Rock Mechanics / Geomechanics Symposium","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129969712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comprehensive case study on lost circulation of Changqing Mizhi Block in perspective of geomechanics 地质力学视角下长庆米脂块体漏失综合实例研究

Proceedings 56th US Rock Mechanics / Geomechanics Symposium Pub Date : 2022-06-26 DOI: 10.56952/arma-2022-0196

jiang wei Luo, Xingbao Li, Fansheng Ban, Yujie Zhu, Shaoyun Chen, Sheng Jin, Zhenhua Che, Jingnan Dong

{"title":"A comprehensive case study on lost circulation of Changqing Mizhi Block in perspective of geomechanics","authors":"jiang wei Luo, Xingbao Li, Fansheng Ban, Yujie Zhu, Shaoyun Chen, Sheng Jin, Zhenhua Che, Jingnan Dong","doi":"10.56952/arma-2022-0196","DOIUrl":"https://doi.org/10.56952/arma-2022-0196","url":null,"abstract":"Drilling mud loss is of crucial importance in drilling. Lost circulation will extend the well construction period, cause investment losses, and even cause serious downhole accidents. In the Mizhi block of Changqing Oilfield targeted by this research, serious leakage occurred in many wellbore drilling processes, which has seriously affected the development of the block and caused economic losses. This paper focuses the mud loss during the drilling process of more than 200 wells in the Mizhi block, and counts the key loss data such as the lost horizons, the amount of lost drilling fluid, the average leak rate, and the density of the drilling fluid, and fully analyzes the possible reasons of the lost circulation. Collecting logging data, modeling geomechanics of some key wells and formations, taking cores and the geomechanical model is established. Analyzing the logging data and the specific leakage situation, the leakage mainly comes from fractured leakage, and the leakage horizon is mainly located at the bottom of the Liujiagou Formation, the entire interval of the Shiqianfeng Formation and the top of the Shihezi Formation. Most of the mud loss sections are sand-mudstone interbeds. Geomechanical analysis shows that the rock mechanical strength of the entire interval is difficult to support the stability of the wellbore under the drilling fluid density of 1.1 grams per cubic meter, but the block loss pressure is generally between 1.1 - 1.2 grams per cubic meter. Collapse and leakage coexist in the wellbore. This study gives the method of drilling fluid optimization, and gives the possible reasons for the leakage from the perspective of geomechanics, which has important guiding significance for the further development of the Mizhi block.","PeriodicalId":418045,"journal":{"name":"Proceedings 56th US Rock Mechanics / Geomechanics Symposium","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122189817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0