This study aims to eliminate the subjectivity and inconsistency inherent in the traditional International Association of Drilling Contractors(IADC)bit wear rating process,which heavily depends on the experience of dri...This study aims to eliminate the subjectivity and inconsistency inherent in the traditional International Association of Drilling Contractors(IADC)bit wear rating process,which heavily depends on the experience of drilling engineers and often leads to unreliable results.Leveraging advancements in computer vision and deep learning algorithms,this research proposes an automated detection and classification method for polycrystalline diamond compact(PDC)bit damage.YOLOv10 was employed to locate the PDC bit cutters,followed by two SqueezeNet models to perform wear rating and wear type classifications.A comprehensive dataset was created based on the IADC dull bit evaluation standards.Additionally,this study discusses the necessity of data augmentation and finds that certain methods,such as cropping,splicing,and mixing,may reduce the accuracy of cutter detection.The experimental results demonstrate that the proposed method significantly enhances the accuracy of bit damage detection and classification while also providing substantial improvements in processing speed and computational efficiency,offering a valuable tool for optimizing drilling operations and reducing costs.展开更多
The maximum internal tangential stress is a critical parameter for the design of the PDC （polycrystalline diamond compact） die that has been widely applied to offshore oil drilling. A new simple equation for the cal...The maximum internal tangential stress is a critical parameter for the design of the PDC （polycrystalline diamond compact） die that has been widely applied to offshore oil drilling. A new simple equation for the calculation of the stress is developed, and verified by the test data from Kingdream Corp. of China, the largest bit Company in China. An opti- mum method for the design of the PDC die is presented and demonstrated in detail, and software for the design and FEM analysis of the die is developed on the basis of the method. This software has been used in oil industry in recent years.展开更多
In mould design, it is necessary for a designer to ensure that the cylinder has enough intensity in both the prestressed and synthesis states. An individual layer cylindrical mould cannot withstand a very high pressur...In mould design, it is necessary for a designer to ensure that the cylinder has enough intensity in both the prestressed and synthesis states. An individual layer cylindrical mould cannot withstand a very high pressure needed in polycrystalline diamond composite (PDC) production. So, multi-layer prepressure combination assemble moulds are often used. The analysis conducted here is to study the interaction of cylindrical layers and to explain how to obtain enough load capability with the lowest requirement of material performance. The ratio of the pressure cylinder radius of synthetic diamond is 3.27, which is close to the optimal value and can be used as structure size in a design for PDC bit compact die. There is a linear relationship between the internal and external pressures under a special tangent stress on the inner wall of the pressure cylinder. So, when two of the three parameters (the internal pressure, external pressure, and the requirement value of the tangent stress on the inner wall of the pressure cylinder) are given, the third can be obtained. The sleeve acts as a bridge?between the pressure cylinder and the steel belts. The optimum model developed in this paper can be used in PDC bit compact die design and other similar prestressed cold extrusion die design.展开更多
Polycrystalline diamond compact(PDC)drill bit often performs with low ROP,short service life and poor stability under complicated and difficult to drill formations.Therefore,a vertical wheel PDC bit is proposed,which ...Polycrystalline diamond compact(PDC)drill bit often performs with low ROP,short service life and poor stability under complicated and difficult to drill formations.Therefore,a vertical wheel PDC bit is proposed,which is a new drill bit technology applying an integrated unit combining the tooth wheel and the rotary shaft thereof.Besides,the experiments on motion and mechanical characteristics of the vertical wheel under the conditions of tooth shape and number of teeth,normal deflection angle of the wheel,and different cutting depth were carried out using variable parameter experimental device,and the movement,force law,and crushing specific work of vertical wheel under different experimental conditions were obtained.The comparative experiments of PDC cutting rock breaking under the conditions of parallel cutting of PDC unit and pre-damage of the wheel were also carried out,and the cutting load of PDC teeth under pre-damage conditions is between 38.72% and 70.95%lower than that of parallel cutting was obtained.Finally,a comparative experiment of indoor drilling between vertical wheel PDC bit and conventional PDC bit was carried out.Results show than when drilling in gravel rock,under the same WOB,the torque response of vertical wheel PDC bit is equivalent to that of the PDC bit,while the ROP of vertical wheel PDC bit is 22.94%-53.33% higher than that of conventional PDC bit,and the threedimensional acceleration of the vertical wheel PDC bit is 19.17%-76.23% of that of the PDC bit.The experimental results contribute to a better understanding of vertical wheels and provide technical support for their use in PDC bits.展开更多
How to exploit efficiently unconventional hydrocarbon has become an important step to solve the problem of increasing reserve and production of oil&gas in China.Aiming at unconventional oil&gas well engineerin...How to exploit efficiently unconventional hydrocarbon has become an important step to solve the problem of increasing reserve and production of oil&gas in China.Aiming at unconventional oil&gas well engineering problems such as large cluster well design,single trip drilling operation,downhole radiofrequency heating,efficient exploitation of coalbed methane,and so on,this article analyzes the related research progress briefly at home and abroad,and focuses on the research results of the author's team.Technical contents introduced in this article mainly include:the design methods of large cluster horizontal wells with considerations of directional drilling operation limit and the anti-collision while drilling;research advances in crucial techniques for the single trip drilling operation related to the innovative research work on efficient PDC bits,steering bottomhole assembly,drilling parameter optimization,new type of drilling fluid and so on;general situation of development and the research results in downhole radiofrequency heating technology for unconventional oil recovery by the in-situ conversion process;finally,briefly introducing significance and technical challenge of the coalbed methane development and utilization,and focusing on the representative achievement of coaled methane exploitation in China,which is related to key techniques involving the geological evaluation,magnetic steering drilling,well completion&washing,efficient fracturing with combination of the preposed nitrogen and activated water and so on.A review of the research advances may be a beneficial reference in optimal design and operation control of well engineering technology for unconventional hydrocarbon.展开更多
Aiming at the problems of deep shale gas wells in Baima Block of Fuling Shale Gas Field, such as deep burial, complicated geological structure, frequent leakage, low penetration rate and low cementing quality rate, th...Aiming at the problems of deep shale gas wells in Baima Block of Fuling Shale Gas Field, such as deep burial, complicated geological structure, frequent leakage, low penetration rate and low cementing quality rate, the difficulties in drilling and completion of deep shale gas in Baima Block are summarized based on the analysis of the geological characteristics of the block and the previous drilling and completion data. Through the technical research of differential wellbore structure optimization, sectional wellbore trajectory control, personalized PDC bit design, anti-high temperature leak-proof and plugging drilling fluid technology and narrow safety window cementing technology, A set of fast drilling and completion technology suitable for deep shale gas in Baima Block has been formed and applied in this block for 15 wells, with the average penetration rate increased by 41.95% year on year, the drilling cycle shortened by 30.40%, and the cementing quality rate increased by 10%. The application effect is good. The technology can be popularized and applied as fast drilling and completion technology for deep shale gas in Baima Block.展开更多
This paper provides a mathematical model and numerical method for predicting the velocity and temperature fields in the mud flows at the surface of a PDC (Polycrystalline Diamond Compact) bit. A 81/2' ( 21 59cm...This paper provides a mathematical model and numerical method for predicting the velocity and temperature fields in the mud flows at the surface of a PDC (Polycrystalline Diamond Compact) bit. A 81/2' ( 21 59cm ) crown type PDC R bit is used as an example. The complex configuration of the PDC bit surface is resolved numerically using body fitting coordinates and the cutters are simplified as drag elements in the momentum equations and as heat source in the energy equation. The finite volume method is used to discretize the momentum and energy equations for the non Newtonian flow. The numerical results effectively predict the flow structure and temperature field which can be used to design and optimize the PDC bit.展开更多
基金support of the CNPC International Collaborative Research Project(No.2022DQ0410)。
文摘This study aims to eliminate the subjectivity and inconsistency inherent in the traditional International Association of Drilling Contractors(IADC)bit wear rating process,which heavily depends on the experience of drilling engineers and often leads to unreliable results.Leveraging advancements in computer vision and deep learning algorithms,this research proposes an automated detection and classification method for polycrystalline diamond compact(PDC)bit damage.YOLOv10 was employed to locate the PDC bit cutters,followed by two SqueezeNet models to perform wear rating and wear type classifications.A comprehensive dataset was created based on the IADC dull bit evaluation standards.Additionally,this study discusses the necessity of data augmentation and finds that certain methods,such as cropping,splicing,and mixing,may reduce the accuracy of cutter detection.The experimental results demonstrate that the proposed method significantly enhances the accuracy of bit damage detection and classification while also providing substantial improvements in processing speed and computational efficiency,offering a valuable tool for optimizing drilling operations and reducing costs.
文摘The maximum internal tangential stress is a critical parameter for the design of the PDC （polycrystalline diamond compact） die that has been widely applied to offshore oil drilling. A new simple equation for the calculation of the stress is developed, and verified by the test data from Kingdream Corp. of China, the largest bit Company in China. An opti- mum method for the design of the PDC die is presented and demonstrated in detail, and software for the design and FEM analysis of the die is developed on the basis of the method. This software has been used in oil industry in recent years.
文摘In mould design, it is necessary for a designer to ensure that the cylinder has enough intensity in both the prestressed and synthesis states. An individual layer cylindrical mould cannot withstand a very high pressure needed in polycrystalline diamond composite (PDC) production. So, multi-layer prepressure combination assemble moulds are often used. The analysis conducted here is to study the interaction of cylindrical layers and to explain how to obtain enough load capability with the lowest requirement of material performance. The ratio of the pressure cylinder radius of synthetic diamond is 3.27, which is close to the optimal value and can be used as structure size in a design for PDC bit compact die. There is a linear relationship between the internal and external pressures under a special tangent stress on the inner wall of the pressure cylinder. So, when two of the three parameters (the internal pressure, external pressure, and the requirement value of the tangent stress on the inner wall of the pressure cylinder) are given, the third can be obtained. The sleeve acts as a bridge?between the pressure cylinder and the steel belts. The optimum model developed in this paper can be used in PDC bit compact die design and other similar prestressed cold extrusion die design.
基金This work was supported by the open fund project of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation in 2021(Grant No.PLN2021-18)City-school Science and Technology Strategic Cooperation Project of Nanchong City and Southwest Petroleum University(Grant No.SXHZ014)Postdoctoral Science Foundation of China(Grant No.2021M693909).
文摘Polycrystalline diamond compact(PDC)drill bit often performs with low ROP,short service life and poor stability under complicated and difficult to drill formations.Therefore,a vertical wheel PDC bit is proposed,which is a new drill bit technology applying an integrated unit combining the tooth wheel and the rotary shaft thereof.Besides,the experiments on motion and mechanical characteristics of the vertical wheel under the conditions of tooth shape and number of teeth,normal deflection angle of the wheel,and different cutting depth were carried out using variable parameter experimental device,and the movement,force law,and crushing specific work of vertical wheel under different experimental conditions were obtained.The comparative experiments of PDC cutting rock breaking under the conditions of parallel cutting of PDC unit and pre-damage of the wheel were also carried out,and the cutting load of PDC teeth under pre-damage conditions is between 38.72% and 70.95%lower than that of parallel cutting was obtained.Finally,a comparative experiment of indoor drilling between vertical wheel PDC bit and conventional PDC bit was carried out.Results show than when drilling in gravel rock,under the same WOB,the torque response of vertical wheel PDC bit is equivalent to that of the PDC bit,while the ROP of vertical wheel PDC bit is 22.94%-53.33% higher than that of conventional PDC bit,and the threedimensional acceleration of the vertical wheel PDC bit is 19.17%-76.23% of that of the PDC bit.The experimental results contribute to a better understanding of vertical wheels and provide technical support for their use in PDC bits.
基金Project supported by the Program of Creative Research Groups of the National Natural Science Foundation of China“Basic research on drilling and completion of complex wells”(No.:51821092)Key Program of National Natural Science Foundation of China“Basic research on well construction for efficient development of shale and tight oil/gas fields”(No.:U1762214)National Key R&D Program of China“Evaluation technologies for safety control and wellbore integrity in injection/production projects”(No.:2018YFB0605502)。
文摘How to exploit efficiently unconventional hydrocarbon has become an important step to solve the problem of increasing reserve and production of oil&gas in China.Aiming at unconventional oil&gas well engineering problems such as large cluster well design,single trip drilling operation,downhole radiofrequency heating,efficient exploitation of coalbed methane,and so on,this article analyzes the related research progress briefly at home and abroad,and focuses on the research results of the author's team.Technical contents introduced in this article mainly include:the design methods of large cluster horizontal wells with considerations of directional drilling operation limit and the anti-collision while drilling;research advances in crucial techniques for the single trip drilling operation related to the innovative research work on efficient PDC bits,steering bottomhole assembly,drilling parameter optimization,new type of drilling fluid and so on;general situation of development and the research results in downhole radiofrequency heating technology for unconventional oil recovery by the in-situ conversion process;finally,briefly introducing significance and technical challenge of the coalbed methane development and utilization,and focusing on the representative achievement of coaled methane exploitation in China,which is related to key techniques involving the geological evaluation,magnetic steering drilling,well completion&washing,efficient fracturing with combination of the preposed nitrogen and activated water and so on.A review of the research advances may be a beneficial reference in optimal design and operation control of well engineering technology for unconventional hydrocarbon.
文摘Aiming at the problems of deep shale gas wells in Baima Block of Fuling Shale Gas Field, such as deep burial, complicated geological structure, frequent leakage, low penetration rate and low cementing quality rate, the difficulties in drilling and completion of deep shale gas in Baima Block are summarized based on the analysis of the geological characteristics of the block and the previous drilling and completion data. Through the technical research of differential wellbore structure optimization, sectional wellbore trajectory control, personalized PDC bit design, anti-high temperature leak-proof and plugging drilling fluid technology and narrow safety window cementing technology, A set of fast drilling and completion technology suitable for deep shale gas in Baima Block has been formed and applied in this block for 15 wells, with the average penetration rate increased by 41.95% year on year, the drilling cycle shortened by 30.40%, and the cementing quality rate increased by 10%. The application effect is good. The technology can be popularized and applied as fast drilling and completion technology for deep shale gas in Baima Block.
文摘This paper provides a mathematical model and numerical method for predicting the velocity and temperature fields in the mud flows at the surface of a PDC (Polycrystalline Diamond Compact) bit. A 81/2' ( 21 59cm ) crown type PDC R bit is used as an example. The complex configuration of the PDC bit surface is resolved numerically using body fitting coordinates and the cutters are simplified as drag elements in the momentum equations and as heat source in the energy equation. The finite volume method is used to discretize the momentum and energy equations for the non Newtonian flow. The numerical results effectively predict the flow structure and temperature field which can be used to design and optimize the PDC bit.
