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
It has been found that the rock breaking tools combination of positive displacement motors(PDM)with different output parameters(positive rotational speed and positive torque)and polycrystalline diamond compact(PDC)bit...It has been found that the rock breaking tools combination of positive displacement motors(PDM)with different output parameters(positive rotational speed and positive torque)and polycrystalline diamond compact(PDC)bits with different design features exhibits significant differences in rock breaking effi-ciency and stability.This indicates that studying the compatibility between PDC bit and PDM before conducting drilling process is necessary.TheΦ215.9 mm wellbore condition in Longmaxi formation was taken as an example,the positive rotational speed and positive torque exerted byΦ197mm PDM with different number of lobes and pitch length were calculated,PDC bit with different cutting strategies were designed.Then finite element method(FEM)models considering PDM output parameters were established to study rock breaking process.Required weight on bit(WOB),required mechanical specific energy(MSE),reaction torque on bit(TOB),and vibration characteristics at near-bit position under the designed rate of penetration(ROP)were obtained.Research results showed that:(1)The energy required for PDC bit with certain design features breaking shale is not a constant value,but a value changes with rotational speed and positive torque exerted by different PDM.(2)The ability controlling vibration of PDM tends to stabilize when the number of lobes N and pitch length h exceeds 5 and 140 mm respectively in general conditions,Thus combination design parameters when N=5,h=140 mm were suggested to balance rock breaking efficiency and service life of drill strings.(3)Compared with other cutting strategies,when rock breaking pattern consist of“face to face”interaction and“point to point”interaction,both rock breaking efficiency and stability were higher.While when matched with this cutting strategy,N=8 and h=140/200 mm were recommended for PDM design instead of N=5 and h=140 mm obtained in most cases,which cloud minimize the loss of rock breaking efficiency and improve the axial/circumferential stability by 14.24%–17.23%and 24.93%–35.73%respectively.An integrated selection and design method of PDC bit and PDM was established and implemented,which revealed the rock breaking efficiency and stability patterns of different rock breaking tools combinations,providing theoretical support and suggestions for the integrated selection and design of PDC bits and PDM in Longmaxi formation.展开更多
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
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CNPC(China National Petroleum Corporation)-SWPU(South-west Petroleum University)Innovation Consortium Project:Optimization research on drilling method and technology for complex formations in deep wells,Project ID:2020CX040103,2020/01-2025/12Essential Research and Development Plan by Department of Science and Technology in Sichuan Province(International Science and Technology Innovation Cooperation/Hong Kong Macao Taiwan Science and Technology Innovation Cooperation Project):Mechanism and Key Technologies of CO_(2) Accelerating Mineralization and Storage in Basalt Strata,Project ID:2023YFH0005,2023/01-2025/12Essential Research and Development Plan by Department of Science and Technology in Sichuan Province:Research on Geological Storage and Disaster Prevention of CO_(2)in Deep Saline Water Layer,Project ID:2022YFSY0007,2023/01-2025/12.
文摘It has been found that the rock breaking tools combination of positive displacement motors(PDM)with different output parameters(positive rotational speed and positive torque)and polycrystalline diamond compact(PDC)bits with different design features exhibits significant differences in rock breaking effi-ciency and stability.This indicates that studying the compatibility between PDC bit and PDM before conducting drilling process is necessary.TheΦ215.9 mm wellbore condition in Longmaxi formation was taken as an example,the positive rotational speed and positive torque exerted byΦ197mm PDM with different number of lobes and pitch length were calculated,PDC bit with different cutting strategies were designed.Then finite element method(FEM)models considering PDM output parameters were established to study rock breaking process.Required weight on bit(WOB),required mechanical specific energy(MSE),reaction torque on bit(TOB),and vibration characteristics at near-bit position under the designed rate of penetration(ROP)were obtained.Research results showed that:(1)The energy required for PDC bit with certain design features breaking shale is not a constant value,but a value changes with rotational speed and positive torque exerted by different PDM.(2)The ability controlling vibration of PDM tends to stabilize when the number of lobes N and pitch length h exceeds 5 and 140 mm respectively in general conditions,Thus combination design parameters when N=5,h=140 mm were suggested to balance rock breaking efficiency and service life of drill strings.(3)Compared with other cutting strategies,when rock breaking pattern consist of“face to face”interaction and“point to point”interaction,both rock breaking efficiency and stability were higher.While when matched with this cutting strategy,N=8 and h=140/200 mm were recommended for PDM design instead of N=5 and h=140 mm obtained in most cases,which cloud minimize the loss of rock breaking efficiency and improve the axial/circumferential stability by 14.24%–17.23%and 24.93%–35.73%respectively.An integrated selection and design method of PDC bit and PDM was established and implemented,which revealed the rock breaking efficiency and stability patterns of different rock breaking tools combinations,providing theoretical support and suggestions for the integrated selection and design of PDC bits and PDM in Longmaxi formation.
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.
文摘四川盆地超深层油气的开发是钻探领域的重中之重。为满足超深井整个井身结构设计及钻进过程井筒稳定性的需要,针对四川盆地大尺寸井眼,以增强钻头稳定性、提高钻头破岩效率为目的,研制了Ф812.8 mm(32 in)PDC钻头,并在SDCK1井进行了现场应用。该钻头采用10刀翼设计,冠部采用稳定性较好的长锥形轮廓,并采用大小水眼混布方式提高切屑齿的冷却及井筒清洁效果。建立了Ф812.8 mm PDC钻头井底流场仿真模型,通过水力优化进行喷嘴倾角设计。研究及现场应用结果表明:钻井液喷射倾角为16°时在井底所形成的压力梯度和矢量图所表现出的效果较好;与牙轮钻头相比,研制的PDC钻头单趟钻进尺提高150%,单趟纯钻时间延长25.8%,平均机械钻速提高89%,钻头稳定性好,破岩效率高。研究结果可为四川盆地大尺寸井眼钻头设计提供指导。
