Wear Characteristics of Polycrystalline Diamond Compact Drill Bits in Small Diameter Rock Drilling

1985 ◽  
Vol 107 (4) ◽  
pp. 534-542 ◽  
Author(s):  
C. L. Hough ◽  
B. Das
Keyword(s):  
Small Diameter ◽  
Polycrystalline Diamond ◽  
Wear Test ◽  
Test Results ◽  
Failure Characteristics ◽  
Wear Characteristics ◽  
Drill Bits ◽  
Rotary Speed ◽  
Polycrystalline Diamond Compact ◽  
Single Material

The wear characteristics of polycrystalline diamond compact (PDC) drill bits were investigated in the context of drilling small holes in a hard abrasive medium. An efficient method for measuring wear of the PDC drill bits was developed. The wear test results were grouped or categorized in terms of rotary speed, feed and wear or failure characteristics. Contrary to the three classical wear phases (break-in, uniform wear and rapid breakdown) of the single material cutters, four distinctive wear phases were formed for the PDC cutters: I–break-in, II–diamond wear, III–carbide wear, and IV–rapid breakdown. The characteristics of the wear phases were identified and some suggestions were made to alleviate the wear problem.

Life Models for Small-Diameter Polycrystalline Diamond Compact Bits in Hard Abrasive Media

1986 ◽  
Vol 108 (4) ◽  
pp. 310-314
Author(s):  
C. L. Hough ◽  
B. Das ◽  
T. G. Rozgonyi
Keyword(s):  
Cutting Speed ◽  
Small Diameter ◽  
Polycrystalline Diamond ◽  
Prediction Equation ◽  
Logarithmic Model ◽  
Drill Bits ◽  
Rate Versus ◽  
Rotary Speed ◽  
Bit Life ◽  
Polycrystalline Diamond Compact

Mathematical models for bit life of polycrystalline diamond compact (PDC) drill bits were developed for drilling small holes in hard abrasive media. Based on the wear-out criterion of an average 0.060 in. (1.5 mm) flank wear land, bit life equations were formulated in three forms: bit life versus rotary speed and feed rate, bit life versus rotary speed and penetration rate, and wear rate versus cutting speed and cutter engagement area. The traditional linear-logarithmic model proved inadequate to describe bit life, whereas the quadratic-logarithmic model provided the best bit life prediction equation. Consequently, it would be possible to predict the optimum economical drilling conditions more accurately by employing a quadratic-logarithmic based bit life equation. The equation demonstrated the ability to predict the bit life precisely under different modes of wear.

scholarly journals Design and test of a self-adaptive bionic polycrystalline diamond compact bit inspired by cat claw

2018 ◽  
Vol 10 (11) ◽  
pp. 168781401881024
Author(s):  
Qiongqiong Tang ◽  
Wei Guo ◽  
Ke Gao ◽  
Rongfeng Gao ◽  
Yan Zhao ◽  
...  
Keyword(s):  
Service Life ◽  
Soft Rock ◽  
Polycrystalline Diamond ◽  
Rake Angle ◽  
The Self ◽  
Test Results ◽  
Short Service Life ◽  
Polycrystalline Diamond Compact ◽  
Rock Strata ◽  
Self Adaptive

Cats protract claws while hunting or pawing on the ground and retract to muscles when relaxing. Inspired by this behavior, and in order to solve the problem of short service life and low comprehensive drilling efficiency of polycrystalline diamond compact bits which results from its poor adaptability to soft-hard interbedded strata, a self-adaptive bionic polycrystalline diamond compact bit was designed, which can use the elastic element to adjust its back-rake angle according to the formation hardness to improve the adaptability of polycrystalline diamond compact bits. Theoretical analysis and drilling test results show that the self-adaptive bionic polycrystalline diamond compact bit has a strong adaptability to soft-hard interbedded rock strata. When drilling in soft rock, the back-rake angle is small and the rate of penetration is high; when drilling in hard rock, the angle becomes larger to reduce the abnormal damage of cutters. Thus, it can improve the integrated drilling efficiency and service life of polycrystalline diamond compact bits. In the whole drilling test, the average penetration rate of the self-adaptive bionic polycrystalline diamond compact bit increases by 10%–13% over conventional polycrystalline diamond compact bits with the same dimension and material.

scholarly journals Bionic design and test of polycrystalline diamond compact bit for hard rock drilling in coal mine

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402092318
Author(s):  
Chuanliu Wang
Keyword(s):  
Service Life ◽  
Coal Mine ◽  
Hard Rock ◽  
Polycrystalline Diamond ◽  
Research Direction ◽  
Future Research ◽  
Test Results ◽  
Bionic Design ◽  
Rock Drilling ◽  
Polycrystalline Diamond Compact

For hard rock drilling in coal mine, the drilling efficiency and service life of polycrystalline diamond compact bit are very low. To overcome these shortcomings, the bionic technology is applied to the design and processing of polycrystalline diamond compact bit. The bit body and polycrystalline diamond compact cutter are designed as bionic structures, and the test of the bionic polycrystalline diamond compact bit is carried out. Test results show that, when drilling in fine sandstone with hardness greater than 9, the performance of the bionic polycrystalline diamond compact bit is significantly improved. Comparing with the Φ113-mm concave polycrystalline diamond compact bit, the service life and drilling efficiency of the A-type bionic polycrystalline diamond compact bit increase by 54% and 230%, respectively, the service life and drilling efficiency of the B-type bionic polycrystalline diamond compact bit increase by 345% and 204%, respectively, which show that the bionic design of polycrystalline diamond compact bit can provide a new research idea for hard rock drilling in coal mine. Also the test results indicate that, when processing the bionic polycrystalline diamond compact cutter, the linear cutting process will cause thermal damage to the diamond layer of polycrystalline diamond compact cutter, while the cold grinding process shows higher comprehensive performance, therefore the one-time synthesis of bionic polycrystalline diamond compact cutter is the future research direction.

scholarly journals Application of an innovative ridge-ladder-shaped polycrystalline diamond compact cutter to reduce vibration and improve drilling speed

2020 ◽  
Vol 103 (3) ◽  
pp. 003685042093097
Author(s):  
Dou Xie ◽  
Zhiqiang Huang ◽  
Yuqi Yan ◽  
Yachao Ma ◽  
Yuan Yuan
Keyword(s):  
Oil And Gas ◽  
Polycrystalline Diamond ◽  
Rock Breaking ◽  
Drilling Process ◽  
Drilling Speed ◽  
Stick Slip ◽  
Gas Drilling ◽  
Drill Bits ◽  
Element Simulation ◽  
Polycrystalline Diamond Compact

Polycrystalline diamond compact bits have been widely used in the Oil and Gas drilling industry, despite the fact that they may introduce undesired vibration into the drilling process, for example, stick-slip and bit bounce, which accelerate the failure rate and lead to higher drilling costs. First, we develop an innovative ridge-ladder-shaped polycrystalline diamond compact cutter, which has ridge-shaped cutting faces and multiple cutting edges with stepped distribution, in the hope of reducing vibration and improving drilling speed. Then, the scrape tests of ridge-ladder-shaped and general polycrystalline diamond compact cutters are carried out in a laboratory, indicating that the cutting, lateral, and longitudinal forces on ridge-ladder-shaped polycrystalline diamond compact cutters are smaller and with minor fluctuations. Due to different rock-breaking mechanisms, ridge-ladder-shaped polycrystalline diamond compact cutters have higher cutting efficiency compared to general polycrystalline diamond compact cutters, which is also verified experimentally. Finally, the drilling characteristics of a new polycrystalline diamond compact bit fitted with some ridge-ladder-shaped polycrystalline diamond compact cutters are compared to those of a general polycrystalline diamond compact bit by means of finite element simulation. The results show that introducing ridge-ladder-shaped polycrystalline diamond compact cutters can not only reduce the stick-slip vibration, bit bounce, and backward rotation of drill bits effectively, but also improve their rate of penetration.

The Effect of Back Rake Angle on the Performance of Small-Diameter Polycrystalline Diamond Rock Bits: ANOVA Tests

1986 ◽  
Vol 108 (4) ◽  
pp. 305-309 ◽  
Author(s):  
C. L. Hough
Keyword(s):  
Specific Energy ◽  
Statistical Difference ◽  
Penetration Rate ◽  
Small Diameter ◽  
Polycrystalline Diamond ◽  
Rake Angle ◽  
Performance Criteria ◽  
Maximum Penetration ◽  
Rotary Speed ◽  
Selection Of

The effect of back rake angle on a center vacuum bit design was investigated through factorial Analysis of Variance (ANOVA) tests for drilling in shale. Multiple performance criteria: penetration rate, specific energy and torque were used in these tests. Thrust and rotary speed were the controlled variables. Results from ANOVA tests showed that rake angle has a significant effect on penetration rate and torque but not on specific energy. Further tests of means revealed that the 20-deg bit gave the maximum penetration rate although there was no statistical difference among the 15, 20 and 25-deg angles. Tests of means also revealed that the 7-deg bit gives the minimum torque, but is statistically the same as the 15 and 25-deg bits. The results of the test will be useful for design and selection of small-diameter bits for drilling in shale and sand formations.

scholarly journals Variation in Composition of Aluminium Alloy Al6463 on Wear Characteristics and Compressive Strength

2020 ◽  
Vol 44 (5) ◽  
pp. 359-364
Author(s):  
Amardeepak Mahadikar ◽  
Elliriki Mamatha ◽  
Sanjeeva Murthy ◽  
Narayana B. Doddapattar
Keyword(s):  
Compressive Strength ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Wear Test ◽  
Industrial Sector ◽  
Attractive Alternative ◽  
Test Results ◽  
Compression Tests ◽  
Natural Form ◽  
Wear Characteristics

Aluminium is one of the widely used metals in industrial sector owing to its specific features and its commercial production started in late 19th century. In its natural form it is combined with oxygen and other elements and is the third most abundant metal in the earth’s crust. It can be machined easily and has a Face Centred Cubic (FCC) structure. Aluminium alloys are an attractive alternative to ferrous materials for tribological applications due to their low density and high thermal conductivity. The microstructure of aluminium alloys can be modified and mechanical properties can be improved by alloying, cold working and heat treatment. The present work mainly focuses on the study of the effect of variation in composition on the wear characteristics and compressive strength of aluminium alloy Al6463 by varying the compositions of the two major alloying elements, Magnesium (Mg) and Silicon (Si) in the alloy. Four specimens of the aluminium alloy Al6463 are prepared each for Magnesium composition varying b/w (0.5 to 0.875%) and Silicon composition varying b/w (0.2 to 0.575%). Wear and compression tests were carried out as per ASTM standard. The results of the wear test indicate that the least wear rate was obtained for specimens of 0.750% Mg and 0.575% Si composition of the alloy Al6463 at a higher load of 1.5 kg. Also, the compression test results indicate that the specimens with 0.750% Mg and 0.575% Si compositions of the alloy Al6463 exhibit better compressive strength.

scholarly journals Effect of Co Leaching on the Vertical Turning Lathe Wear Properties of Polycrystalline Diamond Compact Manufactured by High Temperature and High Pressure Sintering Process

2020 ◽  
Vol 58 (7) ◽  
pp. 480-487
Author(s):  
Min-Seok Baek ◽  
Ji-Won Kim ◽  
Bae-Gun Park ◽  
Hee-Sub Park ◽  
Kee-Ahn Lee
Keyword(s):  
High Pressure ◽  
Wear Resistance ◽  
High Temperature ◽  
Polycrystalline Diamond ◽  
Wear Test ◽  
Fatigue Properties ◽  
Wear Properties ◽  
Gas Drilling ◽  
Polycrystalline Diamond Compact ◽  
Sliding Distance

Polycrystalline diamond compact (PDC) has excellent wear resistance, high impact resistance, superior fatigue properties, and has been used in the oil and gas drilling industries. This study investigated the effect of Co leaching on the microstructure, vertical turning lathe (VTL) wear properties of PDCs manufactured by high-temperature and high-pressure (HTHP) sintering. The VTL wear test has the advantage of simulating the actual oil drilling environment by using granite as the workpiece. PDC sintered material that did not receive Co leaching was named HTHP sintered PDC-A, and the material subjected to Co leaching was called Co-leached PDC-B in this study. As a result of XRD analysis of both PDCs, diamond and WC peaks were detected, and only the HTHP sintered PDC-A exhibited some Co peaks. In the HTHP sintered PDC-A, the binder WC and Co were evenly distributed at the diamond interface. However, in the Co-leached PDC-B, some empty spaces were observed at the diamond interface. The HTHP sintered PDCA exhibited a similar or slightly higher VTL wear resistance than the Co-leached PDC-B, but only in the short sliding distance. In the long sliding distance after 9 km, Co-leached PDC-B showed significantly superior wear resistance compared to the HTHP sintered PDC-A. The HTHP sintered PDC-A exhibited both abrasive and adhesive wear behaviors, while the Co-leached PDC-B showed only abrasive wear. Based on the above results, the VTL wear mechanism of PDCs, and ways of improving wear resistance were also discussed.

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