Xu-2 formation in Xinchang structure of Western Sichuan Basin is a dense fractured reservoir which is buried deeply. Horizontal well drilling technology can effectively develop such gas reservoir. In this paper, first horizontal well of Xinchang Structure Xin10-1H well was taken as an example, the difficulties encountered in its safety and fast drilling were analyzed and corresponding technical measures were proposed. This summary is helpful to promote the technology of safe and fast horizontal drilling in Western Sichuan Basin.
{"title":"Safety and Fast Horizontal Drilling Technology in Xujiahe Formation of Western Sichuan Basin","authors":"Chunyu Feng","doi":"10.3968/9467","DOIUrl":"https://doi.org/10.3968/9467","url":null,"abstract":"Xu-2 formation in Xinchang structure of Western Sichuan Basin is a dense fractured reservoir which is buried deeply. Horizontal well drilling technology can effectively develop such gas reservoir. In this paper, first horizontal well of Xinchang Structure Xin10-1H well was taken as an example, the difficulties encountered in its safety and fast drilling were analyzed and corresponding technical measures were proposed. This summary is helpful to promote the technology of safe and fast horizontal drilling in Western Sichuan Basin.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121283397","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}
Y. Lei, Runsen Qin, Hui-Bo Wen, Huijiang Chang, Shangqi Zhai
Weak gel flooding has been tested and achieved good results in Bohai heavy oilfields. Based on the mechanism analysis and numerical simulation study, weak gel flooding technology is believed to be effect of increasing oil and decreasing water in light oilfields. BZ S oilfield is a low-viscosity oilfield based on horizontal wells development. Due to different production online time and production rate of the well groups of injection and production horizontal wells, it caused advantageous channels formed between injection and production wells in some groups, which reduce storage rate of injection water and affect the development effect. In order to suppress the injected water onrush along the high permeability layer and improve water-oil mobility ratio and sweep efficiency, we have selected two groups for the weak gel flooding test. After flooding test, we evaluate and analyze the recovery and injection characteristics. It shows the test did not achieve the expected result. Therefore, we sum up reasons for the defeat. First, for horizontal injection wells, weak gel plugged well section of relatively pool physical property around water injection wells, increase of wellhead pressure for injection wells make it difficult to meet the requirements of injection allocation. Second, weak gel is hard to work for the pattern of spacing greater than 400m. For these two reasons, weak gel is not displaced and injected to the deep reservoir, and superior channel is still existed, not present precipitation increased the effect of oil wells. Through the evaluation and failure analysis of this displacement test, we proposed technical requirements for weak gel flooding on the horizontal group of injection and production wells. It provided practical experience and references for the other oilfields EOR tertiary oil recovery programs.
{"title":"Weak Gel Flooding Research and Effect Assessment of Horizontal Injection-Production Well Groups in Light Level of Oilfields","authors":"Y. Lei, Runsen Qin, Hui-Bo Wen, Huijiang Chang, Shangqi Zhai","doi":"10.3968/9420","DOIUrl":"https://doi.org/10.3968/9420","url":null,"abstract":"Weak gel flooding has been tested and achieved good results in Bohai heavy oilfields. Based on the mechanism analysis and numerical simulation study, weak gel flooding technology is believed to be effect of increasing oil and decreasing water in light oilfields. BZ S oilfield is a low-viscosity oilfield based on horizontal wells development. Due to different production online time and production rate of the well groups of injection and production horizontal wells, it caused advantageous channels formed between injection and production wells in some groups, which reduce storage rate of injection water and affect the development effect. In order to suppress the injected water onrush along the high permeability layer and improve water-oil mobility ratio and sweep efficiency, we have selected two groups for the weak gel flooding test. After flooding test, we evaluate and analyze the recovery and injection characteristics. It shows the test did not achieve the expected result. Therefore, we sum up reasons for the defeat. First, for horizontal injection wells, weak gel plugged well section of relatively pool physical property around water injection wells, increase of wellhead pressure for injection wells make it difficult to meet the requirements of injection allocation. Second, weak gel is hard to work for the pattern of spacing greater than 400m. For these two reasons, weak gel is not displaced and injected to the deep reservoir, and superior channel is still existed, not present precipitation increased the effect of oil wells. Through the evaluation and failure analysis of this displacement test, we proposed technical requirements for weak gel flooding on the horizontal group of injection and production wells. It provided practical experience and references for the other oilfields EOR tertiary oil recovery programs.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114015330","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}
At present, the quality of effluent water from the pretreatment process of ultra-filtration in BinYi station is poor, which lead to late block and effluent water is not up to A1 standard. Based on the analysis of the ultra-filtration membrane pollutants, a scale of 1 m 3 /d field experiment was carried out in Binyi station. Air flotation- biochemistry –ultra-filtration process was used, biochemical degradation strains of COD (BW-1, BW-2, BW-3, WSW-4) and heavy oil degradation strains (3-2-1, 1-2-1) were inoculated. After treatment, the COD of ultra-filtration effluent decreased from 300-400 mg/L to 60-80mg/L, oil content decreased from 20-60 mg/L to about 1 mg/L, suspended solids reduced from 50-100 mg/L to under 1mg/L, the median diameter decreased from 6.4 µm to 0.8 µm, SRB reduced from 25 to 0 per milliliter, HCO 3- decreased from 500-600 mg/L to below 100 mg/L, the hardness decreased from 11-12 mmol/L to 10-11 mmol/L, NO 3- increased from 0 to 63 mg/L, SDI reduced to 4.8.
{"title":"Research on Air Flotation-Biochemistry-Ultra-Filtration Treatment Technology of Heavy Oil Sewage","authors":"Yongqiang Pan, Yuwen Liu, Ximing Li, Zhijian Wang, Qingxin Song, Xin Bai","doi":"10.3968/9454","DOIUrl":"https://doi.org/10.3968/9454","url":null,"abstract":"At present, the quality of effluent water from the pretreatment process of ultra-filtration in BinYi station is poor, which lead to late block and effluent water is not up to A1 standard. Based on the analysis of the ultra-filtration membrane pollutants, a scale of 1 m 3 /d field experiment was carried out in Binyi station. Air flotation- biochemistry –ultra-filtration process was used, biochemical degradation strains of COD (BW-1, BW-2, BW-3, WSW-4) and heavy oil degradation strains (3-2-1, 1-2-1) were inoculated. After treatment, the COD of ultra-filtration effluent decreased from 300-400 mg/L to 60-80mg/L, oil content decreased from 20-60 mg/L to about 1 mg/L, suspended solids reduced from 50-100 mg/L to under 1mg/L, the median diameter decreased from 6.4 µm to 0.8 µm, SRB reduced from 25 to 0 per milliliter, HCO 3- decreased from 500-600 mg/L to below 100 mg/L, the hardness decreased from 11-12 mmol/L to 10-11 mmol/L, NO 3- increased from 0 to 63 mg/L, SDI reduced to 4.8.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125746670","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}
Xiaoming Ye, Chunliang Huo, Pengfei Wang, Jianmin Yang, Junfei Li
Due to large lateral oscillation amplitude, it tends to form complex meander belt in meandering river, which makes the internal sand body size and distribution characteristics of meandering river deposits in different region very complex. Subsurface reservoir architectural elements analysis based on the experience formula summarized from the outcrop and modern deposition research tends to have greater uncertainty. Microfacies sandbody size was measured through fine reservoir architecture research on mature area of target oilfield, it is concluded that meandering river microfacies sandbody scale is closely related to the size of the sedimentary system, the point bar width has the highest degree in related to meander belt width in the narrow banding patterns. Under different curvature, meandering river point bar length and width present a certain positive correlation, when the curvature is less than 1.7, the correlation is higher. The quantitative relation of different configuration unit of the target oilfield was established，it provided a quantitative basis for fine research and geological modeling on less well area of target oilfield and similar oilfield.
{"title":"Quantitative Relation of the Point BarWidth and Meander Belt Width of Subsurface Reservoir","authors":"Xiaoming Ye, Chunliang Huo, Pengfei Wang, Jianmin Yang, Junfei Li","doi":"10.3968/9465","DOIUrl":"https://doi.org/10.3968/9465","url":null,"abstract":"Due to large lateral oscillation amplitude, it tends to form complex meander belt in meandering river, which makes the internal sand body size and distribution characteristics of meandering river deposits in different region very complex. Subsurface reservoir architectural elements analysis based on the experience formula summarized from the outcrop and modern deposition research tends to have greater uncertainty. Microfacies sandbody size was measured through fine reservoir architecture research on mature area of target oilfield, it is concluded that meandering river microfacies sandbody scale is closely related to the size of the sedimentary system, the point bar width has the highest degree in related to meander belt width in the narrow banding patterns. Under different curvature, meandering river point bar length and width present a certain positive correlation, when the curvature is less than 1.7, the correlation is higher. The quantitative relation of different configuration unit of the target oilfield was established，it provided a quantitative basis for fine research and geological modeling on less well area of target oilfield and similar oilfield.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126443805","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}
J. Ge, Kaili Liao, Luchao Jin, Guicai Zhang, Lipei Fu
This paper studies the preparation process and characterization of gemeni-diol, an intermedium compound for synthesizing anionic gemini surfactant. Firstly, as a material to synthesize anionic gemini surfactant, high purity ethylene glycol diglycidyl ether (EGDGE) is obtained by distill epoxy resin thinner at a reduced pressure. Based on gas chromatogram, 94.51 percent of liquid at cut points of 116-119℃/5mmHg is EGDGE. Then the effects of catalyst and reaction time on the reaction of nonylphenol and EGDGE are investigated. The results show the optimized conditions to synthesize gemini-diol are as following: using 0.25%KOH and 0.25% phosphorus triphenyl as catalyst to keep the reaction of nonylphenol and EGDGE at 110℃ for 3-5h. The yield of gemini-diol is 88.2% under these conditions.
{"title":"Preparation and Characterization of Gemini Surfactant Intermedium","authors":"J. Ge, Kaili Liao, Luchao Jin, Guicai Zhang, Lipei Fu","doi":"10.3968/9457","DOIUrl":"https://doi.org/10.3968/9457","url":null,"abstract":"This paper studies the preparation process and characterization of gemeni-diol, an intermedium compound for synthesizing anionic gemini surfactant. Firstly, as a material to synthesize anionic gemini surfactant, high purity ethylene glycol diglycidyl ether (EGDGE) is obtained by distill epoxy resin thinner at a reduced pressure. Based on gas chromatogram, 94.51 percent of liquid at cut points of 116-119℃/5mmHg is EGDGE. Then the effects of catalyst and reaction time on the reaction of nonylphenol and EGDGE are investigated. The results show the optimized conditions to synthesize gemini-diol are as following: using 0.25%KOH and 0.25% phosphorus triphenyl as catalyst to keep the reaction of nonylphenol and EGDGE at 110℃ for 3-5h. The yield of gemini-diol is 88.2% under these conditions.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128115580","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}
In order to meet the requirements of high temperature acidizing, a new acid gelatinizer was synthesized by choosing non ionic monomer AM, complex cationic monomer H-DMDAAC, anionic monomer AMPS as starting materials and redox system as initiator in aqueous solution at low temperature. Various factors influencing polymerization reaction were analyzed, the optimum conditions of polymerization were determined, the basic performance of gelling acid was evaluated and its action mechanism was studied. The results show that it has good property to increase viscosity, resistance to high temperature and acid-rock reaction retardation, the viscosity of acidizing fluid of 20% mass fraction can reach 37.5 mPa·s at the high temperature of 150℃ and shearing rate of 170s-1 when the mass fraction of ZCY-1 is 1%; mass fraction of gelling acid remains 11.9% after 60 min’s reaction with limestone, which is 7 times more than that of common acid, it can meet the need of acidizing in high temperature wells.
{"title":"Synthesizing and Performance Test of a New Aciding Gelatinizer ZCY-1","authors":"Bo Zhou","doi":"10.3968/9453","DOIUrl":"https://doi.org/10.3968/9453","url":null,"abstract":"In order to meet the requirements of high temperature acidizing, a new acid gelatinizer was synthesized by choosing non ionic monomer AM, complex cationic monomer H-DMDAAC, anionic monomer AMPS as starting materials and redox system as initiator in aqueous solution at low temperature. Various factors influencing polymerization reaction were analyzed, the optimum conditions of polymerization were determined, the basic performance of gelling acid was evaluated and its action mechanism was studied. The results show that it has good property to increase viscosity, resistance to high temperature and acid-rock reaction retardation, the viscosity of acidizing fluid of 20% mass fraction can reach 37.5 mPa·s at the high temperature of 150℃ and shearing rate of 170s-1 when the mass fraction of ZCY-1 is 1%; mass fraction of gelling acid remains 11.9% after 60 min’s reaction with limestone, which is 7 times more than that of common acid, it can meet the need of acidizing in high temperature wells.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129822281","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}
To survey He-8 member tight sand reservoir with low porosity and permeability in Mizhi gas field in Ordos basin, using the conventional well log data, this paper proposes the tight sand reservoir productivity prediction model and classification criterion based on BP neural network, getting quick classification of gas well productivity. We can predict sand reserve quantitatively instead qualitatively with the methods．Applications show that the methods of productivity prediction are effective and practical．
{"title":"Productivity Prediction of Tight Sandstone Reservoir Based on BP Neural Network","authors":"Yulei Wang","doi":"10.3968/9476","DOIUrl":"https://doi.org/10.3968/9476","url":null,"abstract":"To survey He-8 member tight sand reservoir with low porosity and permeability in Mizhi gas field in Ordos basin, using the conventional well log data, this paper proposes the tight sand reservoir productivity prediction model and classification criterion based on BP neural network, getting quick classification of gas well productivity. We can predict sand reserve quantitatively instead qualitatively with the methods．Applications show that the methods of productivity prediction are effective and practical．","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130989079","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 research on inaccessible pore volume is completed on the basis of laboratory experiments. The experiment prepared 4 different kinds of polymers, whose molecular weight are 8 million, 12 million, 16 million and 20 million whose molecular coil size are measured by light blockage counter. Through kerosene mass method we can get pore cumulative distribution of field cores and finally plot the relation between the inaccessible pore volume and molecular coil size of polymer. The size of small pore where primary water was taken as the minimum number polymer coils can be passed. Then the polymer molecular weight with better compatibility with rock pores is optimized. The study shows with the increase of polymer relative molecular mass, pore volume increased linearly. The conclusion can better guide the selection of the polymers in practical production.
{"title":"Laboratory Experiment on Inaccessible Pore Volume of Polymer Flooding","authors":"Yiqi Zou, Zijuan Cao, Erlong Yang","doi":"10.3968/9448","DOIUrl":"https://doi.org/10.3968/9448","url":null,"abstract":"The research on inaccessible pore volume is completed on the basis of laboratory experiments. The experiment prepared 4 different kinds of polymers, whose molecular weight are 8 million, 12 million, 16 million and 20 million whose molecular coil size are measured by light blockage counter. Through kerosene mass method we can get pore cumulative distribution of field cores and finally plot the relation between the inaccessible pore volume and molecular coil size of polymer. The size of small pore where primary water was taken as the minimum number polymer coils can be passed. Then the polymer molecular weight with better compatibility with rock pores is optimized. The study shows with the increase of polymer relative molecular mass, pore volume increased linearly. The conclusion can better guide the selection of the polymers in practical production.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"37 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120920384","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}
When the wellhead temperature for gas wells is low, freezing accident in wellbore could happen because of hydrate generation. Through designing the monitoring and alarming system, the freezing accident can be avoided. The pressure and temperature distribution along wellbore is computed through multi-phase flowing theory, based on the data acquired from the wellhead. Comparing to the hydrate P-T Graph by the picture interpreting means, the results can judge the situation of the hydrate and show the depth range with the hydrate in gas wells, so that the system can monitor and alarm hydrate. The system contains three main functions: calculating the pressure and temperature in wellbore during production or well shutting; forecasting the hydrate generation; design of the alarming and prevention. The software made up by these methods can realize the aim to real-time monitor and alarm hydrate. Finally, the software of the system is shown with the suggestion to avoid hydrate during gas well testing and production.
{"title":"Monitoring and Alarming System for Hydrate in Gas Wells","authors":"Xiaozhe Guo, Jing Li, Li Song, Lei Rui","doi":"10.3968/9477","DOIUrl":"https://doi.org/10.3968/9477","url":null,"abstract":"When the wellhead temperature for gas wells is low, freezing accident in wellbore could happen because of hydrate generation. Through designing the monitoring and alarming system, the freezing accident can be avoided. The pressure and temperature distribution along wellbore is computed through multi-phase flowing theory, based on the data acquired from the wellhead. Comparing to the hydrate P-T Graph by the picture interpreting means, the results can judge the situation of the hydrate and show the depth range with the hydrate in gas wells, so that the system can monitor and alarm hydrate. The system contains three main functions: calculating the pressure and temperature in wellbore during production or well shutting; forecasting the hydrate generation; design of the alarming and prevention. The software made up by these methods can realize the aim to real-time monitor and alarm hydrate. Finally, the software of the system is shown with the suggestion to avoid hydrate during gas well testing and production.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116857125","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}
Compared to the water-based drilling fluids, lost circulation is more prone to occur when drilling with oil-based drilling fluids and it is difficult to deal with this problem on the drilling site for lack of high-efficiency lost circulation materials. In order to solve this technical problem, the principles of pressure resistance plugging technology of oil-based drilling fluids was firstly investigated according to the force-chain principle of granular matter mechanics, and rigid bridging particles, elastic packing particles and micro fibers could synergistically form fracture tight sealing zones with strong force-chain network to strengthen the lost circulation prevention ability of oil-based drilling fluids. Based on the principle above, novel loss-prevention materials were finally developed for oil-based drilling fluids by optimizing different plugging agents. Experimental results show that novel loss-prevention materials could be compatible with other components of oil-based drilling fluids. The oil-based drilling fluids with high sealing capacity could be optimized by adding novel loss-prevention materials, and it exhibits good rheological behavior with a low PPT filtration of 11.4 mL and excellent lost circulation prevention ability to strengthen the wellbore while drilling.
{"title":"Experimental study on loss-prevention performance of oil-based drilling fluids","authors":"J. Chai, Junyi Liu, Z. Qiu","doi":"10.3968/9415","DOIUrl":"https://doi.org/10.3968/9415","url":null,"abstract":"Compared to the water-based drilling fluids, lost circulation is more prone to occur when drilling with oil-based drilling fluids and it is difficult to deal with this problem on the drilling site for lack of high-efficiency lost circulation materials. In order to solve this technical problem, the principles of pressure resistance plugging technology of oil-based drilling fluids was firstly investigated according to the force-chain principle of granular matter mechanics, and rigid bridging particles, elastic packing particles and micro fibers could synergistically form fracture tight sealing zones with strong force-chain network to strengthen the lost circulation prevention ability of oil-based drilling fluids. Based on the principle above, novel loss-prevention materials were finally developed for oil-based drilling fluids by optimizing different plugging agents. Experimental results show that novel loss-prevention materials could be compatible with other components of oil-based drilling fluids. The oil-based drilling fluids with high sealing capacity could be optimized by adding novel loss-prevention materials, and it exhibits good rheological behavior with a low PPT filtration of 11.4 mL and excellent lost circulation prevention ability to strengthen the wellbore while drilling.","PeriodicalId":313367,"journal":{"name":"Advances in Petroleum Exploration and Development","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128008602","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}
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