In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequen...In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequently leading to the failure and damage of threaded connections.In severe cases,it can result in considerable economic losses and trigger safety accidents.The sealing performance of special bolted joints holds crucial importance for production efficiency,output,equipment lifespan,and cost control.Enhancing the sealing perfor-mance of threaded connections can have a positive impact on industrial production and environmental protection.The existing research on American Petroleum Institute threaded joints has been thorough and has obtained a series of excellent results.However,the research on the sealing damage mechanism of threaded connections under complex well conditions lacks sufficient depth and that on new sealing technology is scarce.This study proposes a half-size evaluation test to address the abovementioned problem.Based on this test,an investigation into the sealing performance of threaded connections under high-temperature,cyclic loading,and high-temperature creep conditions is conducted.This study uses a combined approach of finite element methods and experiments to investigate the impact of different makeup torques on the sealing performance of premium threaded connections(PTCs).The results of the half-size evaluation test indicate that temperature notably influences the sealing performance of threaded connections.The continuous action of high temperatures causes contact pressure and sealing performance to decrease,and sealing contact pressure increases after cooling.Finite element and test results show that for a certain joint A,the greater the torque,the higher the critical sealing pressure of the thread,and the better the sealing performance.The research on the sealing damage mechanism of PTCs provides a scientific basis and theoretical guidance for the further optimization and development of PTCs.展开更多
Using premium casing connections instead of API ones is one of the mosteffective technique to prevent casing failure. The factors contribute to the strength of premiumcasing connections are studied with FEA and full-s...Using premium casing connections instead of API ones is one of the mosteffective technique to prevent casing failure. The factors contribute to the strength of premiumcasing connections are studied with FEA and full-scale test. The criterions are presented thatensure the connection's strength higher than the pipe. At the same time, the method is given todecrease the peak stress of the connection so as to improve its anticorruption property. At last,full-scale tests are done to test the strength of the connections designed with the methoddescribed, the results show that the connection's strength is higher than the pipe. This indicatedthat the method described is effective in designing premium casing connection.展开更多
Premium thread connection tubing and casing products are non-API products that are used in severe oil field conditions, such as deep wells ,ultra deep wells, high pressure gas wells, horizontal wells and steam injecti...Premium thread connection tubing and casing products are non-API products that are used in severe oil field conditions, such as deep wells ,ultra deep wells, high pressure gas wells, horizontal wells and steam injection wells, etc. In order to meet the requirements of oilfields for premium thread connection oil country tubular goods （ OCTG）, Baosteel developed its own series of premium thread connection tubing and casing products that are protected by intellectual property rights. This study introduces the process of developing the premium thread connection tubing and casing products, their characteristics, and their actual application in oil fields. It hopes to give customers a better understanding of Premium thread connection tubing and casing products from Baosteel.展开更多
In order to analyze the sealing performance of a new designed premium threaded connection,this paper studies the sealing reliability and sensitivity of the premium threaded connection at its most dangerous load condit...In order to analyze the sealing performance of a new designed premium threaded connection,this paper studies the sealing reliability and sensitivity of the premium threaded connection at its most dangerous load condition based on Kriging model.The load condition of premium threaded connection in deep well is so complex that the most dangerous load point of premium threaded connection under the typical series loads is studied by finite element analysis(FEA) method firstly.Since the FEA of the premium threaded connection is too time-consuming,Kriging model which is accurate and efficient for multidimensional and highly nonlinear problems is built to calculate the sealing reliability of the premium threaded connection at the most dangerous load point.Finally,the sealing sensitivity analysis of the premium threaded connection is performed by the method of variance-based global sensitivity analysis.The work in this paper could contribute for the analysis and further improvement of the premium threaded connection.展开更多
为了满足我国非常规油气井勘探开发对特殊螺纹套管的结构完整性及密封完整性需求,设计出适用于Φ177.8 mm油井管的特殊螺纹接头。采用有限元仿真分析方法对设计的Φ177.8 mm BJC-Ⅱ特殊螺纹接头进行模拟分析,并依据API RP 5C5:2017 CAL...为了满足我国非常规油气井勘探开发对特殊螺纹套管的结构完整性及密封完整性需求,设计出适用于Φ177.8 mm油井管的特殊螺纹接头。采用有限元仿真分析方法对设计的Φ177.8 mm BJC-Ⅱ特殊螺纹接头进行模拟分析,并依据API RP 5C5:2017 CALⅣ级试验标准对特殊螺纹接头进行了全尺寸实物性能评价。结果表明,设计的Φ177.8 mm BJC-Ⅱ特殊螺纹接头在拉伸/压缩、内压/外压、弯曲及180℃高温载荷作用下具有优异的气密封性能,接头的拉伸效率、内压效率、外压效率、压缩效率达到100%等管体性能,为我国非常规油气井的勘探开发提供了产品保障。展开更多
为了分析研究油套管螺纹脂摩擦因数对特殊扣螺纹上扣曲线的影响规律,对螺纹脂的摩擦因数试验和特殊扣油套管上卸扣试验的结果进行了对比分析。结果表明,摩擦因数在0.900至0.935之间时,台肩扭矩值较低,说明可能存在一个“最优摩擦区间”...为了分析研究油套管螺纹脂摩擦因数对特殊扣螺纹上扣曲线的影响规律,对螺纹脂的摩擦因数试验和特殊扣油套管上卸扣试验的结果进行了对比分析。结果表明,摩擦因数在0.900至0.935之间时,台肩扭矩值较低,说明可能存在一个“最优摩擦区间”,在此区间内特殊扣螺纹接头的过盈配合和密封结构的完整性最高。另外通过对API RP 5A3标准的分析,指出将该标准中的摩擦因数测试方法直接应用于油套管螺纹脂在实际应用中具有局限性,应开发和验证适合评价油套管螺纹脂摩擦学性能的试验方法,以确定不同摩擦学性能的螺纹脂对特殊扣油套管上扣曲线的影响规律。展开更多
文摘In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequently leading to the failure and damage of threaded connections.In severe cases,it can result in considerable economic losses and trigger safety accidents.The sealing performance of special bolted joints holds crucial importance for production efficiency,output,equipment lifespan,and cost control.Enhancing the sealing perfor-mance of threaded connections can have a positive impact on industrial production and environmental protection.The existing research on American Petroleum Institute threaded joints has been thorough and has obtained a series of excellent results.However,the research on the sealing damage mechanism of threaded connections under complex well conditions lacks sufficient depth and that on new sealing technology is scarce.This study proposes a half-size evaluation test to address the abovementioned problem.Based on this test,an investigation into the sealing performance of threaded connections under high-temperature,cyclic loading,and high-temperature creep conditions is conducted.This study uses a combined approach of finite element methods and experiments to investigate the impact of different makeup torques on the sealing performance of premium threaded connections(PTCs).The results of the half-size evaluation test indicate that temperature notably influences the sealing performance of threaded connections.The continuous action of high temperatures causes contact pressure and sealing performance to decrease,and sealing contact pressure increases after cooling.Finite element and test results show that for a certain joint A,the greater the torque,the higher the critical sealing pressure of the thread,and the better the sealing performance.The research on the sealing damage mechanism of PTCs provides a scientific basis and theoretical guidance for the further optimization and development of PTCs.
文摘Using premium casing connections instead of API ones is one of the mosteffective technique to prevent casing failure. The factors contribute to the strength of premiumcasing connections are studied with FEA and full-scale test. The criterions are presented thatensure the connection's strength higher than the pipe. At the same time, the method is given todecrease the peak stress of the connection so as to improve its anticorruption property. At last,full-scale tests are done to test the strength of the connections designed with the methoddescribed, the results show that the connection's strength is higher than the pipe. This indicatedthat the method described is effective in designing premium casing connection.
文摘Premium thread connection tubing and casing products are non-API products that are used in severe oil field conditions, such as deep wells ,ultra deep wells, high pressure gas wells, horizontal wells and steam injection wells, etc. In order to meet the requirements of oilfields for premium thread connection oil country tubular goods （ OCTG）, Baosteel developed its own series of premium thread connection tubing and casing products that are protected by intellectual property rights. This study introduces the process of developing the premium thread connection tubing and casing products, their characteristics, and their actual application in oil fields. It hopes to give customers a better understanding of Premium thread connection tubing and casing products from Baosteel.
文摘In order to analyze the sealing performance of a new designed premium threaded connection,this paper studies the sealing reliability and sensitivity of the premium threaded connection at its most dangerous load condition based on Kriging model.The load condition of premium threaded connection in deep well is so complex that the most dangerous load point of premium threaded connection under the typical series loads is studied by finite element analysis(FEA) method firstly.Since the FEA of the premium threaded connection is too time-consuming,Kriging model which is accurate and efficient for multidimensional and highly nonlinear problems is built to calculate the sealing reliability of the premium threaded connection at the most dangerous load point.Finally,the sealing sensitivity analysis of the premium threaded connection is performed by the method of variance-based global sensitivity analysis.The work in this paper could contribute for the analysis and further improvement of the premium threaded connection.
文摘为了满足我国非常规油气井勘探开发对特殊螺纹套管的结构完整性及密封完整性需求,设计出适用于Φ177.8 mm油井管的特殊螺纹接头。采用有限元仿真分析方法对设计的Φ177.8 mm BJC-Ⅱ特殊螺纹接头进行模拟分析,并依据API RP 5C5:2017 CALⅣ级试验标准对特殊螺纹接头进行了全尺寸实物性能评价。结果表明,设计的Φ177.8 mm BJC-Ⅱ特殊螺纹接头在拉伸/压缩、内压/外压、弯曲及180℃高温载荷作用下具有优异的气密封性能,接头的拉伸效率、内压效率、外压效率、压缩效率达到100%等管体性能,为我国非常规油气井的勘探开发提供了产品保障。
文摘为了分析研究油套管螺纹脂摩擦因数对特殊扣螺纹上扣曲线的影响规律,对螺纹脂的摩擦因数试验和特殊扣油套管上卸扣试验的结果进行了对比分析。结果表明,摩擦因数在0.900至0.935之间时,台肩扭矩值较低,说明可能存在一个“最优摩擦区间”,在此区间内特殊扣螺纹接头的过盈配合和密封结构的完整性最高。另外通过对API RP 5A3标准的分析,指出将该标准中的摩擦因数测试方法直接应用于油套管螺纹脂在实际应用中具有局限性,应开发和验证适合评价油套管螺纹脂摩擦学性能的试验方法,以确定不同摩擦学性能的螺纹脂对特殊扣油套管上扣曲线的影响规律。
