Qing Feng, M. Tian, Shaobo Du, Zijun Huang, Jie Zhang
CBM differs from conventional reservoirs, which is easily damaged with complex factors. There were massive papers on CBM damage mechanism, but with fewer studies on pollution types and stimulating measures. This paper studies various factors on SHI Zhuang CBM field’s production from the perspective of geology, engineering and drainage, establishes typical production model to determine reservoir pollution types, and builds up well and layer selection standard for recovering potential reservoirs. The result proves that impacts on CBM wells productivity cannot be ignored because their damages are huge, such as subsided column, fracturing fluid soaking time, fracturing problems, pumping efficiency, drainage time interval, production efficiency, and liquid loading rates etc. Major factors’ determination and typical curves’ establishment offer references on reservoir diagnosis, which is of great significance on layer selecting stimulation of inefficient wells.
{"title":"Analysis and Diagnosis of CBM Fractured Wells’ Productivity Damage in the Middle of Qinshui Basin, China","authors":"Qing Feng, M. Tian, Shaobo Du, Zijun Huang, Jie Zhang","doi":"10.3968/9488","DOIUrl":"https://doi.org/10.3968/9488","url":null,"abstract":"CBM differs from conventional reservoirs, which is easily damaged with complex factors. There were massive papers on CBM damage mechanism, but with fewer studies on pollution types and stimulating measures. This paper studies various factors on SHI Zhuang CBM field’s production from the perspective of geology, engineering and drainage, establishes typical production model to determine reservoir pollution types, and builds up well and layer selection standard for recovering potential reservoirs. The result proves that impacts on CBM wells productivity cannot be ignored because their damages are huge, such as subsided column, fracturing fluid soaking time, fracturing problems, pumping efficiency, drainage time interval, production efficiency, and liquid loading rates etc. Major factors’ determination and typical curves’ establishment offer references on reservoir diagnosis, which is of great significance on layer selecting stimulation of inefficient wells.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115419660","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}
P. G. O. Ossai, P. N. Ohia, B. Obah, U. Duru, D. O. Onaiwu
In-situ heavy oil recovery involves several field tested enhanced oil recovery methods/techniques with applicable models. Such field tested techniques include non-thermal oil recovery, hybrid oil recovery and solvent-base oil recovery. The viabilities and field successes recorded by these in-situ heavy oil recovery techniques/methods cannot be overemphasized. But, the main focus of this study is on heavy oil recovery using in-situ combustion with attention on the application of Nelson and McNeil model as documented in the in-situ combustion handbook (Partha, 1999). We subjected data(s) obtained from five (5) heavy oil reservoirs located within the same field in the Niger Delta to the correlations, equations, assumptions and calculations proposed by our study model. This enabled the research team to carry out performance evaluations while considering in-situ combustion implementation using our proposed model. Our result outcomes were further validated with a foreign heavy oil reservoir having similar reservoir properties. Our study results show how viable and profitable (with possible commercial production) heavy oil production from unconventional reservoirs in the Niger Delta would be. Currently, most of the internally generated oil revenue by the Nigeria government is from cheap/light oil obtained from conventional reservoirs (which is fast declining globally).
{"title":"Enhanced Recovery of Heavy Oil in the Niger Delta: Nelson and Mcneil Model a Key Option for In-Situ Combustion Application","authors":"P. G. O. Ossai, P. N. Ohia, B. Obah, U. Duru, D. O. Onaiwu","doi":"10.3968/10009","DOIUrl":"https://doi.org/10.3968/10009","url":null,"abstract":"In-situ heavy oil recovery involves several field tested enhanced oil recovery methods/techniques with applicable models. Such field tested techniques include non-thermal oil recovery, hybrid oil recovery and solvent-base oil recovery. The viabilities and field successes recorded by these in-situ heavy oil recovery techniques/methods cannot be overemphasized. But, the main focus of this study is on heavy oil recovery using in-situ combustion with attention on the application of Nelson and McNeil model as documented in the in-situ combustion handbook (Partha, 1999). We subjected data(s) obtained from five (5) heavy oil reservoirs located within the same field in the Niger Delta to the correlations, equations, assumptions and calculations proposed by our study model. This enabled the research team to carry out performance evaluations while considering in-situ combustion implementation using our proposed model. Our result outcomes were further validated with a foreign heavy oil reservoir having similar reservoir properties. Our study results show how viable and profitable (with possible commercial production) heavy oil production from unconventional reservoirs in the Niger Delta would be. Currently, most of the internally generated oil revenue by the Nigeria government is from cheap/light oil obtained from conventional reservoirs (which is fast declining globally).","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129190178","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}
Jieqiong Xue, Yao-hui Xu, Long Jiang, Y. Ma, N. Zhao
Hydraulic fracturing is an effective way to stimulate the production rate for reservoirs with low permeability. However, the infiltration of the fracturing fluid will damage the permeability of the reservoir matrix and the conductivity of the proppant pack. The commonly used HPG and CMHPG were selected to study the gel-breaking performance of the fracturing fluid with different mass concentration, and further to study the damage to the matrix and the proppant pack. Results showed that: The gel-breaking performance of CMHPG is better than that of HPG, the viscosity and the residue content of gel broken solution are significantly reduced; the solid phase damage is the main factor that causes the matrix damage. The smaller the reservoir permeability, the greater the damage rate caused by the fracturing fluid; the greater the amount of the thicker, the greater the amount of residue in the broken gel, and the greater the damage to the conductivity of the proppant pack.
{"title":"Experimental Study of the Damage of Fracturing Fluid","authors":"Jieqiong Xue, Yao-hui Xu, Long Jiang, Y. Ma, N. Zhao","doi":"10.3968/10101","DOIUrl":"https://doi.org/10.3968/10101","url":null,"abstract":"Hydraulic fracturing is an effective way to stimulate the production rate for reservoirs with low permeability. However, the infiltration of the fracturing fluid will damage the permeability of the reservoir matrix and the conductivity of the proppant pack. The commonly used HPG and CMHPG were selected to study the gel-breaking performance of the fracturing fluid with different mass concentration, and further to study the damage to the matrix and the proppant pack. Results showed that: The gel-breaking performance of CMHPG is better than that of HPG, the viscosity and the residue content of gel broken solution are significantly reduced; the solid phase damage is the main factor that causes the matrix damage. The smaller the reservoir permeability, the greater the damage rate caused by the fracturing fluid; the greater the amount of the thicker, the greater the amount of residue in the broken gel, and the greater the damage to the conductivity of the proppant pack.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132747936","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}
With the rapid development of drilling technology, air drilling technology and large displacement well, and horizontal well drilling technology are also known as the main directions of the future drilling development. Compared with conventional drilling mode, air drilling is particular, such as drilling fluid with low density, poor lubrication, large friction coefficient between the drill string and borehole, irregular borehole, well trajectory control difficulty, and so on. Along with the change of drilling condition, the stress of drill string is also changed. However, irregular borehole has a direct impact on the fatigue failure and the stress of drill string. Therefore, it is necessary to analyze drill string stress and influence factors in irregular hole. Based on the previous studies, application of drill string mechanics and statistical regression methods is used to study drill string drag and torque, and it can predict the drilling string stress state with the hole enlargement rate, meanwhile, it also provides a theoretical basis for gas drilling and complex drilling technology.
{"title":"Mechanical Analysis of Drill String Drag and Torque With the Condition of Irregular Borehole","authors":"M. Cai, Lu Wang, Peng Wang, M. Li","doi":"10.3968/10177","DOIUrl":"https://doi.org/10.3968/10177","url":null,"abstract":"With the rapid development of drilling technology, air drilling technology and large displacement well, and horizontal well drilling technology are also known as the main directions of the future drilling development. Compared with conventional drilling mode, air drilling is particular, such as drilling fluid with low density, poor lubrication, large friction coefficient between the drill string and borehole, irregular borehole, well trajectory control difficulty, and so on. Along with the change of drilling condition, the stress of drill string is also changed. However, irregular borehole has a direct impact on the fatigue failure and the stress of drill string. Therefore, it is necessary to analyze drill string stress and influence factors in irregular hole. Based on the previous studies, application of drill string mechanics and statistical regression methods is used to study drill string drag and torque, and it can predict the drilling string stress state with the hole enlargement rate, meanwhile, it also provides a theoretical basis for gas drilling and complex drilling technology.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134619277","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}
Guodong Ji, Haige Wang, Zhijian Hu, Siqi Li, T. Yan, Bing Li
Modal analysis of rock is done in this study, and the results of numerical analysis are presented. Meanwhile, the amplitude-frequency characteristic curve of rock in steady state response is investigated based on the principle of vibration. In addition, indoor experiments are carried out to further analyze the vibration characteristics of rock under harmonic impact. Three main control parameters are considered, including drilling way, excitation frequency and impacting amplitude. Our investigations confirm that the rock has different resonant frequencies and vibration modes in different orders for free vibration system, and there is only one resonant frequency for a rock with one degree of freedom. Based on theoretical analysis and indoor experiments, it can be concluded that the vibration amplitude under resonant frequency of rock is significantly higher than that under non-resonant frequency and in conventional drilling. Also, the vibration response of rock is in the harmonic form by the harmonic impact, and increases with the increase of the impacting amplitude. The vibration characteristics of rock by harmonic impact are validated by numerical analysis and experimental results. Harmonic vibration impact drilling can greatly enhance the vibration amplitude of rock, and further improve the rate of penetration.
{"title":"Vibration Characteristics of Rock Under Harmonic Impact","authors":"Guodong Ji, Haige Wang, Zhijian Hu, Siqi Li, T. Yan, Bing Li","doi":"10.3968/10124","DOIUrl":"https://doi.org/10.3968/10124","url":null,"abstract":"Modal analysis of rock is done in this study, and the results of numerical analysis are presented. Meanwhile, the amplitude-frequency characteristic curve of rock in steady state response is investigated based on the principle of vibration. In addition, indoor experiments are carried out to further analyze the vibration characteristics of rock under harmonic impact. Three main control parameters are considered, including drilling way, excitation frequency and impacting amplitude. Our investigations confirm that the rock has different resonant frequencies and vibration modes in different orders for free vibration system, and there is only one resonant frequency for a rock with one degree of freedom. Based on theoretical analysis and indoor experiments, it can be concluded that the vibration amplitude under resonant frequency of rock is significantly higher than that under non-resonant frequency and in conventional drilling. Also, the vibration response of rock is in the harmonic form by the harmonic impact, and increases with the increase of the impacting amplitude. The vibration characteristics of rock by harmonic impact are validated by numerical analysis and experimental results. Harmonic vibration impact drilling can greatly enhance the vibration amplitude of rock, and further improve the rate of penetration.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126524136","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}
The well LS101 has a deep subject reservoir. The ROP is low and drill bits are changed frequently because of high formation hardness and high rock abrasiveness. Rock breaking mechanism of PDC bit and cone bit is analyzed in this paper. The main factors which affect rock breaking efficiency of bits are provided. LS101 deep formation data provided by REED Hycalog and well logging information are analyzed and Lithological features of LS101 deep formation are gained. Referred to the realistic behavior of each drill bit in this well, the results of bits selection on LS block are recommended, and have the model significance for the future drilling in the same formation of this block.
{"title":"The Bit Selection Research on LS101","authors":"Yu-Chun Li","doi":"10.3968/10087","DOIUrl":"https://doi.org/10.3968/10087","url":null,"abstract":"The well LS101 has a deep subject reservoir. The ROP is low and drill bits are changed frequently because of high formation hardness and high rock abrasiveness. Rock breaking mechanism of PDC bit and cone bit is analyzed in this paper. The main factors which affect rock breaking efficiency of bits are provided. LS101 deep formation data provided by REED Hycalog and well logging information are analyzed and Lithological features of LS101 deep formation are gained. Referred to the realistic behavior of each drill bit in this well, the results of bits selection on LS block are recommended, and have the model significance for the future drilling in the same formation of this block.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123114895","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}
A new polyquarternary ammonium clay stabilizer was synthesized in aqueous solution at low temperature by chosing acrylamide(AM) and dimethyldiallylammonium chloride(DMDAAC) as starting materials and redox system as initiator. its properties were evaluated, action mechanism was deeply studied and field tests were carried out in Chunliang oil field. Laboratory test of performance evaluation shows that it has good compatibility with acid and formation water, good swelling inhibiting ability, swelling inhibiting rate of 1% CSR is over 90% measured whether by dilatometer or centrifugalization method, it has good Erosion and Temperature resistant Property and long effect. It has been applied for 19 wells, the results also indicate it has success ratio of 100% and period of validity is more than 200 days when CSR is applied as clay stabilizer to deal with oil and water well, it has achieved great stimulation effect.
{"title":"Research of Temperature Resistant Clay Stabilizer","authors":"Shangkui Zhou","doi":"10.3968/10086","DOIUrl":"https://doi.org/10.3968/10086","url":null,"abstract":"A new polyquarternary ammonium clay stabilizer was synthesized in aqueous solution at low temperature by chosing acrylamide(AM) and dimethyldiallylammonium chloride(DMDAAC) as starting materials and redox system as initiator. its properties were evaluated, action mechanism was deeply studied and field tests were carried out in Chunliang oil field. Laboratory test of performance evaluation shows that it has good compatibility with acid and formation water, good swelling inhibiting ability, swelling inhibiting rate of 1% CSR is over 90% measured whether by dilatometer or centrifugalization method, it has good Erosion and Temperature resistant Property and long effect. It has been applied for 19 wells, the results also indicate it has success ratio of 100% and period of validity is more than 200 days when CSR is applied as clay stabilizer to deal with oil and water well, it has achieved great stimulation effect.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128088519","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}
Based on the theory of semi-permeable diaphragm equivalent pore pressure, the fluid-chemistry coupling diffusivity equation of pore pressure is deduced, and then fluid-solid-chemistry coupling model for porous media is founded. Based on theory deduction and laboratory experiment, a new model which represents the relation between the pore pressure and the rock intensive parameters (cohesion stress and angle of internal friction) is founded. A new model which can calculate the collapse time for shale is developed by using the Coulomb-Mohr failure criteria, and then the finite element simulation program is developed by using the software of FEPG. According to the research, the drilling fluid of low activity can inhabit the increasing trend of pore pressure nearby the borehole effectively, and the drilling fluid of low activity can also inhabit the decreasing trend of cohesion stress effectively under the influence of chemical field and seeping field, which favors the borehole stability. The lithological character and drilling fluid performance should be considered in the process of evaluation and forecast of collapse time, and the drilling fluid can be optimized by using this multi field coupling model.
{"title":"Analyzing of Multi Field Coupling Borehole Collapse Time for Shale","authors":"X. Miao","doi":"10.3968/10084","DOIUrl":"https://doi.org/10.3968/10084","url":null,"abstract":"Based on the theory of semi-permeable diaphragm equivalent pore pressure, the fluid-chemistry coupling diffusivity equation of pore pressure is deduced, and then fluid-solid-chemistry coupling model for porous media is founded. Based on theory deduction and laboratory experiment, a new model which represents the relation between the pore pressure and the rock intensive parameters (cohesion stress and angle of internal friction) is founded. A new model which can calculate the collapse time for shale is developed by using the Coulomb-Mohr failure criteria, and then the finite element simulation program is developed by using the software of FEPG. According to the research, the drilling fluid of low activity can inhabit the increasing trend of pore pressure nearby the borehole effectively, and the drilling fluid of low activity can also inhabit the decreasing trend of cohesion stress effectively under the influence of chemical field and seeping field, which favors the borehole stability. The lithological character and drilling fluid performance should be considered in the process of evaluation and forecast of collapse time, and the drilling fluid can be optimized by using this multi field coupling model.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127652550","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}
We investigate, via numerical simulation technique, the effect of length-to-diameter ratio on transient air-water two-phase flow in vertically upward cylindrical pipe geometry for parameterisation of the pilot scale laboratory multiphase flow rig. Variables such as axial velocity along the leading Taylor bubble, Taylor bubble length and Taylor bubble velocity are considered. A hydrodynamic entrance length required to establish a fully developed two phase flow was critically evaluated. Aperiodic behaviour on time and space dictates the complexity of continuous and unstable gas liquid flow. The porous injection configuration produced small bubble sizes compared to a single gas injection configuration even at higher gas injection rates. Average axial velocity of the leading Taylor bubble of 0.411, 0.424 and 0.451 m/s were obtained for L / D ratios of 16.6, 83.3 and 166.7 respectively. The eccentricity of the axial velocity on the leading Taylor bubble stream and on its nose is perceived from L / D ratio of 166.7. We obtained a power law function for the radial component of the axial velocity profile in the liquid film ahead of the leading Taylor bubble as , with exponent n =16 for L / D =16.7, n =8 for L / D =83.3 and n =6 for L / D =166.7. Despite the decrease in the exponent as L / D ratio increases, a fully parabolic profile of the axial velocity on the liquid phase ahead of the Taylor bubble is not achieved. This, suggests that further studies on higher L / D ratios should be conducted.
通过数值模拟技术，研究了长径比对垂直向上圆柱形管道中瞬态气水两相流动的影响，并对中试规模实验室多相流装置进行了参数化。考虑了沿导泰勒泡轴向速度、泰勒泡长度和泰勒泡速度等变量。建立完全发展的两相流所需的流体动力入口长度进行了严格评估。在时间和空间上的非周期行为决定了连续和不稳定气液流动的复杂性。即使在较高的注气速率下，与单一注气配置相比，多孔注入配置产生的气泡尺寸也较小。当L / D比为16.6、83.3和166.7时，领先Taylor气泡的平均轴向速度分别为0.411、0.424和0.451 m/s。从L / D比为166.7可以看出，泰勒气泡流的前导及其尾部轴向速度的偏心率。我们得到了泰勒气泡前液膜轴向速度剖面径向分量的幂律函数，当L / D =16.7时，指数n =16，当L / D =83.3时，指数n =8，当L / D =166.7时，指数n =6。尽管指数随着L / D比的增加而降低，但在Taylor气泡前面的液相中，轴向速度的完全抛物线分布并没有实现。这表明应该对更高的L / D比率进行进一步研究。
{"title":"Prediction of Optimum Length to Diameter Ratio for Two-Phase Fluid Flow Development in Vertical Pipes","authors":"J. Chidamoio, Lateef T. Akanji, R. Rafati","doi":"10.3968/9886","DOIUrl":"https://doi.org/10.3968/9886","url":null,"abstract":"We investigate, via numerical simulation technique, the effect of length-to-diameter ratio on transient air-water two-phase flow in vertically upward cylindrical pipe geometry for parameterisation of the pilot scale laboratory multiphase flow rig. Variables such as axial velocity along the leading Taylor bubble, Taylor bubble length and Taylor bubble velocity are considered. A hydrodynamic entrance length required to establish a fully developed two phase flow was critically evaluated. Aperiodic behaviour on time and space dictates the complexity of continuous and unstable gas liquid flow. The porous injection configuration produced small bubble sizes compared to a single gas injection configuration even at higher gas injection rates. Average axial velocity of the leading Taylor bubble of 0.411, 0.424 and 0.451 m/s were obtained for L / D ratios of 16.6, 83.3 and 166.7 respectively. The eccentricity of the axial velocity on the leading Taylor bubble stream and on its nose is perceived from L / D ratio of 166.7. We obtained a power law function for the radial component of the axial velocity profile in the liquid film ahead of the leading Taylor bubble as , with exponent n =16 for L / D =16.7, n =8 for L / D =83.3 and n =6 for L / D =166.7. Despite the decrease in the exponent as L / D ratio increases, a fully parabolic profile of the axial velocity on the liquid phase ahead of the Taylor bubble is not achieved. This, suggests that further studies on higher L / D ratios should be conducted.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125128219","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}
Fengjun Zhou, Haofei Xu, Jinyi Li, Xinran Wang, Guanshan Yan
Reservoir sedimentary rhythmic is an important geological factors influencing the dynamic characteristics of the reservoir development and residual oil distribution. Bohai LD oil field is a typical thick reservoir, large well spacing multilayer commingled production in offshore oil field conditions, the gravity effect is more apparent, the remaining oil in the middle and high water period is comparatively complicated. For further study the remaining oil distribution of reservoir after water flooding, the research of indoor core displacement experiment was carried out. Combine the reservoir properties, design parameters according to similar principle, in this paper, the distribution of remaining oil and the production dynamics characteristics under different rhythm is researched. The research results indicate that: Due to gravitational differentiation, the reservoir is submerged at the bottom under homogeneous rhythm. The higher the core permeability, the stronger the gravity differentiation act, the smaller water flooded vertical thickness is, and remaining oil concentrate at the top. Gravity makes positive rhythm formation longitudinal contradictions become more prominent, after water flooding breakthrough, water cut rise fast, core recovery is low, the remaining oil is concentrated in the upper part of the low permeable formation; Gravitational differentiation can play a role in reverse rhythm, water drive is relatively uniform, core recovery is high. Under composite rhythm, the displacement situation of water drive is similar to the single rhythm.
{"title":"Experiments of Water Flooded Longitudinal State on Offshore Thick Reservoir","authors":"Fengjun Zhou, Haofei Xu, Jinyi Li, Xinran Wang, Guanshan Yan","doi":"10.3968/10072","DOIUrl":"https://doi.org/10.3968/10072","url":null,"abstract":"Reservoir sedimentary rhythmic is an important geological factors influencing the dynamic characteristics of the reservoir development and residual oil distribution. Bohai LD oil field is a typical thick reservoir, large well spacing multilayer commingled production in offshore oil field conditions, the gravity effect is more apparent, the remaining oil in the middle and high water period is comparatively complicated. For further study the remaining oil distribution of reservoir after water flooding, the research of indoor core displacement experiment was carried out. Combine the reservoir properties, design parameters according to similar principle, in this paper, the distribution of remaining oil and the production dynamics characteristics under different rhythm is researched. The research results indicate that: Due to gravitational differentiation, the reservoir is submerged at the bottom under homogeneous rhythm. The higher the core permeability, the stronger the gravity differentiation act, the smaller water flooded vertical thickness is, and remaining oil concentrate at the top. Gravity makes positive rhythm formation longitudinal contradictions become more prominent, after water flooding breakthrough, water cut rise fast, core recovery is low, the remaining oil is concentrated in the upper part of the low permeable formation; Gravitational differentiation can play a role in reverse rhythm, water drive is relatively uniform, core recovery is high. Under composite rhythm, the displacement situation of water drive is similar to the single rhythm.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"46 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129397132","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：