Cone bit bearing seal failure analysis based on the finite element analysis

Zhou, Yi; Huang, Zhiqiang; Tan, Li Ying; Ma, Yachao; Qiu, Chengsong; Zhang, Fuxiao; Yuan, Yuan; Sun, Chunmei; Guo, Liang

doi:10.1016/j.engfailanal.2014.07.007

Cited by 23 publications

(20 citation statements)

References 5 publications

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“…According to the experimental data, the environmental pressure difference between the lubricant and drilling fluid ranges from 0.3MPa to 0.7MPa [3]. The seal interface contact pressure in downhole condition can be calculated by finite element simulation.…”

Section: Calculation Methods Of Optimization Targets Seal Contact Presmentioning

confidence: 99%

“…Compared to a common seal, the bit seal has more complicated structure, and the high temperature and high pressure of well bottom-hole will lead to the lubricant leakage increases. The statistics identified that the main reason of the bit failure is the early seal failure [3]. The seal fail will lead to the lubricant leakage and fatigue wear caused by the contact pressure of the seal interface [4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and Optimization Design of Offshore Drilling Seal

Zhang

Chang

et al. 2017

Polish Maritime Research

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Section: Calculation Methods Of Optimization Targets Seal Contact Presmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Optimization Design of Offshore Drilling Seal

Zhang

Chang

et al. 2017

Polish Maritime Research

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“…The establishment of model materials includes the metal material property definition of shaft diameter and roller bearing, together with the material property definition of bionic non-smooth sealing ring, as shown in Table 3. 3,21 The 9CrW18Mn metal material is adopted, which is the isotropic elastomeric material of linear elastic materials. The material property of bionic non-smooth sealing rings is directly defined as the material of O-shaped sealing rings, which is the NBR.…”

Section: Definition Of the Property Of Materialsmentioning

confidence: 99%

“…However, by analyzing of the failed bimetallic sealing structure collected on site, the major factor of the failure is the wear of rubber rings, as shown in Figures 3 and 4. 3 It not only reduces the service life of bearing, resulting in rapid failure of the entire drilling bit, but also causes frequent replacement of the drilling bit, which reduces drilling efficiency and increases the cost.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of sealing performance of bearing rings of roller-cone bits based on grid-shaped bionic non-smooth surface

Zeng

Zhou

2018

Advances in Mechanical Engineering

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Based on the bionic non-smooth surface theory, this article carries out (1) design of the structure of bionic non-smooth sealing rings and toothed bars of the sealing structure and (2) finite element simulation study on the bionic non-smooth surface structure of roller-cone bits. The result shows that (1) when the parameter Y is equal to the rack angles, the maximum pressure of the Type B is smaller than that of the Type A, while the equivalent stress of the Type A is smaller than that of the Type B; when the parameter Y is equal to the tooth distribution, the maximum pressure and the equivalent stress of the rack angle of 30°are smaller than that of the rack angle of 20°; and when the rack angle is equal to the tooth distribution, the maximum contact pressure and the equivalent stress of the tooth decrease with the increase in the parameter Y.(2) Compared with the O-shaped sealing rings, the new tooth bars avoid the problem of over-large contact area. (3) The grid-shaped sealing structure can increase the wear resistance of rubber rings and delay their wear and aging, thus improving their service life.

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“…using finite element analysis software Workhench analysis on the rubber O-ring maximum Mises stress and maximum shear stress distribution at different angles and chamfer radius of the support, and the support angles and chamfer radius were preferably, the rubber O-ring to solve the problem of stress concentration [15] . In 2014, Zhou Yi, who has been through simulation, experimental methods to study the case of two metal seal failure to find the root cause of the failure, and the improvement and optimization of a new structure, improve seal life [16] .…”

Section: Research Statusmentioning

confidence: 99%

The Research Status of Bearing Seal of Cone Bit at Home and Abroad

2016

IJSR

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Cone bit drilling is the most important rock-breaking tool, its performance will directly affect the quality of drilling, drilling efficiency and drilling cost. High-speed roller bit bearing seal is the weakest link, but also wearing parts, is the most critical factor in determining the life of the high-speed roller bit. Field data statistical analysis showed that early damage caused by bearing failure drill 80% of the total failure of the drill bit, due to early failure and severe wear of the seal bearing 30% of the total failure of the bearing [1][2] . Sealing problem has become a serious impact speed cone bit drilling efficiency and drilling cost of technological bottlenecks, the current oil drilling project is urgently needed to solve the problem. Practice shows that current conventional cone bit bearing seal performance can not meet the requirements, especially in the high speed drilling, when lower seal life, sealing poor durability, seal wear, aging compared serious. Cone bits sealed condition very poor, including high temperature, high tempered medium, high load, and the size of a small sealed chamber, the working conditions and the environment will exacerbate the failure of the seal, but also to study the sealing tape to a lot of difficulties and challenges.Keywords: Cone bit; Seal problems; Research status Cone Bit Bearing Seal ProblemsSealing method currently used mainly rubber O-ring seal, floating seal bi-metal, a single metal floating seal, in recent years invented the double seal, but these are passive seal-tight manner, does not have the automatic discharge of sand functions in wells lower poor working conditions, severe seal failure, short seal life.(1) Rubber ring seal Rubber ring seal the biggest drawback is poor heat resistance properties and does not have exclusive sand, drill seal extremely harsh working conditions, including high temperature, high pressure, high tempered media, though, domestic and cross-sectional shape of the rubber ring to do a lot of research [3] -[5] , but the rubber ring wear property but it has not been solved. Especially at high temperatures, wear resistance of the rubber ring is even more serious, rubber brittle, hardened, abrasion resistance is greatly reduced, the seal will fail prematurely.(2) Metal floating seal Metal floating seal includes a bimetallic floating seal (Shown in figure 1.1) and a single metal floating seal (Shown in figure 1.2). Metal floating seal includes a primary seal and a secondary seal. Primary metal sealing surface of the sealing surface, the auxiliary seals are rubber O-ring seal. Metal floating seal the main problems: First, the primary sealing surface -metal contact surfaces can not be achieved after the deformation automatic wear compensation, once the particles into the mud, gradually increasing wear, the seal will lose its effective role, wear problems can not be resolved. Second auxiliary rubber ring seal -O remains of the rubber ring seal problem is the passive-tight manner, having no active discharge sands properties...

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Cone bit bearing seal failure analysis based on the finite element analysis

Cited by 23 publications

References 5 publications

Experimental and Optimization Design of Offshore Drilling Seal

Experimental and Optimization Design of Offshore Drilling Seal

Evaluation of sealing performance of bearing rings of roller-cone bits based on grid-shaped bionic non-smooth surface

The Research Status of Bearing Seal of Cone Bit at Home and Abroad

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