Effect of the load condition on frictional heat generation and temperature increase within a tri-cone bit during high-temperature formation drilling

Suto, Yuko; Takahashi, Hiroshi

doi:10.1016/j.geothermics.2011.08.004

Cited by 14 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To determine the temperature at bit surface is not determined simply by a weight on bit and penetration rate, the flow resistance of grease also affects the drilling process with high temperature formation. The bearing temperature within the bit is increasing continuously during drilling [5]. To measure the pick-rock interface temperature by using copper-constantan thermocouple was introduced into the tool, the response like force, rate of penetration and depth of cut for soft and hard rock's the maximum temperature range is 2360C and 9200C [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and statistical analysis of operational parameters on temperature rise in rock drilling

Shankar¹,

Kunar²,

Murthy³

2018

IJHT

View full text Add to dashboard Cite

Heat generated during rock drilling, due to friction at the bit-rock interface. Due to which temperature increases, which can influence the thermal stress and subsequent rock failure. In this paper, an attempt is made to present results related to the temperature assessment during rotary drilling of rocks on medium-grained sandstone under controlled laboratory conditions. The experiments were conducted by using embedded thermocouple technique, the thermocouple was placed at a distance of 0.5mm (horizontal) from the bit-rock interface. The influence of operational parameters, i.e., the diameter of the drill bit, spindle speed and rate of penetration of rise in temperature was studied using multiple regression and data analysis was carried out using analysis of variance (ANOVA). The temperature was measured by using embedded thermocouple technique at a depth of 6mm, 14mm, 22mm and 30mm respectively. Regression models were developed for the prediction of temperature at the bitrock interface. It was observed that the increase in temperature for medium-grained sandstone was from 49 0 C to 74 0 C (51.08%) with an increase in the diameter of the drill bit, spindle speed and rate of penetration.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental investigation and statistical analysis of operational parameters on temperature rise in rock drilling

Shankar¹,

Kunar²,

Murthy³

2018

IJHT

View full text Add to dashboard Cite

show abstract

“…Zhang et al 15 improved the second-generation SEMS with a custom-shaped rubber seal ring; his investigation found that softer rubber material can obtain greater sealing force, thus reducing the opening between conical surfaces and the rubber ring and keeping the seal within satisfactory performance. Suto and Hiroshi 16 investigated the effects of the load condition on frictional heat and temperature within a cone bit and found that the temperature within the bit increased readily due to insufficient lubrication. Although the cone bit seal has been constantly improved, the failure situation is still a serious problem.…”

Section: Introductionmentioning

confidence: 99%

Optimization of cone bit bearing seal based on failure analysis

Huang

2018

Advances in Mechanical Engineering

View full text Add to dashboard Cite

To improve the performance of the cone bit bearing seal, experimental study and simulation analysis of seal failure were carried out, and optimization of the seal was conducted. Results show that damages are located on the shoulder of the rubber rings due to high shear stress caused by large compression ratio, and serious wear appears on the sealing face of the metal rings because of unreasonable contact pressure distribution. Optimization was conducted by finite element method on three aspects: the dip angles (3°-8°) of the sealing face, the widths (1.3-3.9 mm) of the sealing face, and the back support structure (10°-15°). These three aspects were optimized one by one. Each aspect was optimized by different values, with the average compression ratio and the contact pressure distribution of the sealing face acting as evaluations. The optimal value of the previous optimization step performs as the static value in the next step, and finally, the optimized structure was selected from the last step. The performance of the optimized seal is significantly improved. The compression ratio of the optimized seal rubber drops to less than 14%. The wear mount of the new structure reduces to 20%-38% of the original structure.

show abstract

“…For cone bits that break rock mainly depend on crushing, the rock-breaking efficiency is relatively low since most of the energy is expended in overcoming the compressive stress of rock. [5][6][7][8] On the other hand, polycrystalline diamond compact (PDC) bits break rock in shearing, which allows them to drill much more efficiently than the cone bits in either soft or hard formations. [9][10][11] However, theoretical researches and field applications show that the outer 1/3 radial area of existing PDC bits is subjected to severe wear, especially drilling in abrasive formations, and severe thermal wear often leads to invalidation of several cutters in this area, which will finally result in a 1 School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, China 2 School of Mechatronic Engineering, Southwest Jiaotong University, Chengdu, China premature failure of the bit.…”

Section: Introductionmentioning

confidence: 99%

Kinematic and bottom-hole pattern analysis of a composite drill bit of cross-scraping

Yang

Zhang

Lian

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

For improving the drilling efficiency of polycrystalline diamond compact drill bit, a novel polycrystalline diamond compact drill bit is presented with a new rock-breaking method named as cross-scraping. In the novel polycrystalline diamond compact drill bit which is referred to as a composite drill bit, polycrystalline diamond compact cutters are mounted on rotary wheels as major cutting elements, and as a result, mesh-like scraping tracks are formed in the outer radial area of the bottom-hole. Rock-breaking method of the composite drill bit causes both shearing and fracture failure of the bottom-hole rock, which will greatly increase the rock-breaking efficiency and will prolong the bit service life. By analyzing the complex motion of cutters on the composite drill bit, velocity and acceleration models of the cutters, as well as wheel/bit speed ratio model of the bit are established in accordance with the geometric relationship between cutters and bit body in a compound coordinate system. In simulation examples, motion tracks, velocity and acceleration features of the cutter and especially the bottom-hole pattern are analyzed. Further, indoor experiments are conducted to test the mesh-like bottom-hole pattern and rock-breaking features, which have proved the accuracy of the analysis model of the composite drill bit.

show abstract

Effect of the load condition on frictional heat generation and temperature increase within a tri-cone bit during high-temperature formation drilling

Cited by 14 publications

References 13 publications

Experimental investigation and statistical analysis of operational parameters on temperature rise in rock drilling

Experimental investigation and statistical analysis of operational parameters on temperature rise in rock drilling

Optimization of cone bit bearing seal based on failure analysis

Kinematic and bottom-hole pattern analysis of a composite drill bit of cross-scraping

Contact Info

Product

Resources

About