Development of New PDC Bits for Drilling of Geothermal Wells—Part 2: Field Testing

1992 ◽  
Vol 114 (4) ◽  
pp. 332-338
Author(s):  
S. Misawa ◽  
H. Karasawa
Keyword(s):  
Hard Rock ◽  
Field Tests ◽  
Polycrystalline Diamond ◽  
Field Testing ◽  
Hot Dry Rock ◽  
Rock Formations ◽  
Geothermal Wells ◽  
Project Site ◽  
Polycrystalline Diamond Compact

In order to develop polycrystalline diamond compact (PDC) bits of about 8-1/2 in. in diameter which are able to drill geothermal wells, we have conducted the investigation with respect to the structure of a PDC cutter and rake angles, etc., by means of fundamental laboratory and field tests. New PDC core bits of 8-15/32 in. diameter were designed and manufactured based on the results of these tests. Then, field tests using them were carried out in geothermal wells at Hijiori in Yamagata prefecture, Hot Dry Rock project site in Japan, on September 1989 and October 1990. It became clear that the new PDC core bit can be sufficiently applied to the drilling of heterogeneous hot-hard rock formations from the tests.

Development of New PDC Bits for Drilling of Geothermal Wells—Part 1: Laboratory Testing

1992 ◽  
Vol 114 (4) ◽  
pp. 323-331 ◽  
Author(s):  
H. Karasawa ◽  
S. Misawa
Keyword(s):  
Hard Rock ◽  
Rock Type ◽  
Penetration Rate ◽  
Polycrystalline Diamond ◽  
Rock Cutting ◽  
Rake Angle ◽  
Well Drilling ◽  
Pdc Bit ◽  
Geothermal Wells ◽  
Polycrystalline Diamond Compact

Rock cutting, drilling and durability tests were conducted in order to obtain data to design polycrystalline diamond compact (PDC) bits for geothermal well drilling. Both conventional and new PDC bits with different rake angles were tested. The rock cutting tests revealed that cutting forces were minimized at −10 deg rake angle independent of rock type. In drilling and durability tests, a bit with backrake and siderake angles of −10 or −15 deg showed better performance concerning the penetration rate and the cutter strength. The new PDC bit exhibited better performance as compared to the conventional one, especially in hard rock drilling. Furthermore, a new PDC core bit (98.4 mm o. d., 66 mm i. d.) with eight cutters could be successfully applied to granite drilling equally as well as a bit with twelve cutters.

Assured Stability of Drillstrings Equipped With Polycrystalline Diamond Compact (PDC) Bits

2003 ◽  
Author(s):  
M. A. Elsayed
Keyword(s):  
Stability Analysis ◽  
Geothermal Energy ◽  
Hard Rock ◽  
Rock Type ◽  
Polycrystalline Diamond ◽  
Deep Wells ◽  
Drilling Parameters ◽  
Pipe Joints ◽  
Polycrystalline Diamond Compact ◽  
Oil Gas

Drillstrings equipped with PDC bits are commonly used to drill for oil, gas and geothermal energy. Drillstring instability — defined as the tendency of self-excited vibrations (chatter) to grow with time — causes failure of PDC bits as well as pipe joints. This problem becomes particularly severe in deep wells and hard rock. Much work has been performed in predicting stability. Bit and drillstring geometry as well as rock type affect stability. In this paper, we propose a scheme to assure stability for a given drillstring regardless of bit geometry, utilizing the desired drilling parameters. The effect of bit geometry and rock type in the classic stability analysis are replaced by the drilling parameters, namely: weight-ob-bit (WOB), rate of penetration (ROP) and speed (RPM). Experimental data obtained at Sandia National Labs, Albuquerque, N.M. is used to verify the assured stability equation. This approach is much simpler that classic stability analysis.

Laboratory Comparison of SMART*CUT Picks With WC Picks

2014 ◽  
Vol 1017 ◽  
pp. 323-328 ◽  
Author(s):  
W. Shao ◽  
Xing Sheng Li ◽  
Yong Sun ◽  
Han Huang
Keyword(s):  
Hard Rock ◽  
Cutting Tools ◽  
Infrared Camera ◽  
Polycrystalline Diamond ◽  
Rock Excavation ◽  
Research Organisation ◽  
Recorded Data ◽  
Bonding Technology ◽  
Cutter Forces ◽  
Polycrystalline Diamond Compact

Application of polycrystalline diamond compact (PDC) based cutting tools for hard rock excavation in mining and construction industries has increased significantly in recent years due to their super hardness, superb thermal conductivity and long life durability. Super Material Abrasive Resistant Tool (SMART*CUT) technology has been developed by CSIRO (Commonwealth Scientific and Industrial Research Organisation) in the last 15 years, which includes the replacement of tungsten carbide (WC) tips of the conventional picks with thermally stable diamond composite (TSDC) tips, attachment of the TSDC tips to steel tool bodies with CSIRO’s worldwide patented bonding technology. The wear characteristics of TSDC cutting elements have been investigated previously. In this paper, the preliminary results of cutter forces and resultant angle of SMART*CUT picks were compared with that of traditional WC picks. A tri-axial force dynamometer and a data acquisition system were used to measure the cutter forces. Besides, the cutting area temperature during cutting process was continuously measured by a FLIR SC7600M thermal infrared camera and the recorded data were processed by Altair Software.

Analysis of Coupling Between Axial and Torsional Vibration in a Compliant Model of a Drillstring Equipped With a PDC Bit

2002 ◽  
Author(s):  
M. A. Elsayed ◽  
David W. Raymond
Keyword(s):  
Hard Rock ◽  
Polycrystalline Diamond ◽  
Operating Conditions ◽  
Axial Vibration ◽  
Rock Drilling ◽  
Stick Slip ◽  
Vibration Data ◽  
Pdc Bit ◽  
Show Evidence ◽  
Polycrystalline Diamond Compact

In this paper, we discuss results of rock drilling tests at Sandia National Laboratories’ Hard Rock Drilling Facility (HRDF). The HRDF incorporates a drillstring with axial and torsional compliance and is equipped with a coring bit having PDC (Polycrystalline Diamond Compact) cutters. We measure and analyze chatter and show evidence of stick-slip as well as coupling between axial and torsional vibrations. We show the coupling signature in axial vibration data in the form of side bands indicating frequency modulation at the torsional natural frequency. The influence of operating conditions on the bit response is shown.

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.

New PDC Bit Technology Sets the Standards in Drilling Hard and Abrasive Formations in Oman - Case Study

2014 ◽  
Author(s):  
Z.. Maouche ◽  
F.. Al-Rawahi ◽  
I.. Agapie ◽  
M.. Parasher ◽  
Talal Al Nahwi
Keyword(s):  
High Speed ◽  
Low Cost ◽  
New Technology ◽  
Impact Resistance ◽  
Polycrystalline Diamond ◽  
Rock Formations ◽  
Bit Wear ◽  
Pdc Bit ◽  
Sandstone Formation ◽  
Polycrystalline Diamond Compact

Abstract Historically, the hardest and most abrasive rock formations in Oman have been drilled using either diamond-protected, roller-cone insert bits or impregnated bits in combination with high-speed drives. Polycrystalline diamond compact (PDC) bits have been successfuly used to drill soft and non-abrasive formations to depths of approximately 2, 500 m. Within this region, all previous attempts to drill deeper into the hard and abrasive intervals have resulted in rapid bit wear, poor rate of penetration (ROP), and repetitive trips for bit change. A new PDC cutter technology combined with a novel multi-level cutting structure force balancing has extended the PDC bit footprint, setting new records for drilling the longest intervals of hard and abrasive sandstone formation in Oman. This new technology is the result of a program committed to two years of research, which focused on the improvement of PDC cutter wear and impact resistance, as well as addressing bit vibration and wear distribution issues. As a result, Halliburton DBS PDC bits have become the standard for drilling hard and abrasive rock in the Middle East, providing significant improvement with respect to distances drilled and ROP. In rotary mode, or in combination with low-cost drives, this new technology has drastically reduced the operational cost per foot drilled in Oman.

Design front rake angle of PDC bit based on SolidWorks simulation method

2016 ◽  
Vol 1 (3) ◽  
pp. 627 ◽  
Author(s):  
Xiaoming HAN ◽  
Chenxu LUO ◽  
Xingyu HAN
Keyword(s):  
Hard Rock ◽  
Simulation Analysis ◽  
Soft Rock ◽  
Polycrystalline Diamond ◽  
Simulation Method ◽  
Rake Angle ◽  
Element Simulation ◽  
Pdc Bit ◽  
Coal Rock ◽  
Polycrystalline Diamond Compact

<span lang="EN-US">In order to solve the bit front rake angle parameter selection problem of under different coal rock, it is proposed in polycrystalline diamond compact no core bit as the research object, and established a bit compact two-dimensional stress model of cutting teeth. The result shows that the front rake angle is the factor of cutting force and the drilling efficiency. Application of SolidWorks simulation carries out the finite element simulation analysis respectively to different front rake angle of bit model under the condition of soft rock and hard rock. Form the simulation it concludes that under the condition of soft rock and hard rock, the optimal front rake angle is 10° and 15° respectively. It is obtained that the strength of the bit is largest and the life is longest on the best front rake angle of bit.</span>

Driving in the Dust: Challenges and Lessons Learned from Field Testing in Degraded Visual Environments

2020 ◽  
Vol 64 (1) ◽  
pp. 1916-1920
Author(s):  
Kayla L. Riegner ◽  
Kelly S. Steelman
Keyword(s):  
Research Program ◽  
Field Tests ◽  
Field Testing ◽  
Driving Performance ◽  
Lessons Learned ◽  
Current Paper ◽  
Ground Vehicle ◽  
Significant Safety ◽  
Dust Clouds

Degraded visual environments (DVEs) pose significant safety and efficiency problems in military ground vehicle operations. As part of a larger research program, two field tests were conducted to evaluate driving aids while indirect driving in DVEs. The current paper presents the results of one of these field tests, and focuses on the challenges and lessons learned in designing a challenging test course and producing consistent dust clouds for assessing Soldier driving performance and workload in degraded visual environments.

scholarly journals Experimental Research on the Process Parameters of a Novel Low-Load Drill Bit Used for 7000 m Bedrock Sampling Base on Manned Submersible

2021 ◽  
Vol 9 (6) ◽  
pp. 682
Author(s):  
Yu-Gang Ren ◽  
Lei Yang ◽  
Yan-Jun Liu ◽  
Bao-Hua Liu ◽  
Kai-Ben Yu ◽  
...  
Keyword(s):  
Deep Sea ◽  
Field Tests ◽  
Polycrystalline Diamond ◽  
Design Criterion ◽  
Penetration Length ◽  
Technical Data ◽  
Low Load ◽  
Manned Submersible ◽  
Rotary Speed ◽  
Cutting Model

Due to the need for accurate exploration of deep-sea scientific research, drilling techniques by combining the operational advantages of the Jiaolong manned submersible is considered one of the most feasible methods for deep-sea bedrock drilling. Based on deep sea bedrock cutting model and discrete element simulation, as well as efficient drilling as the design criterion, the development of a deep sea 7000 m electromechanical coring apparatus was carried out. The outstanding feature of this technology is that the bit load produced by the drill pressure is usually within the range 100–400 N while the recommended load for diamond drilling is 1–3 KN or even more. Therefore, searching for the drilling bits that can drill in extremely hard formations with minimal load and acceptable rates of penetration and rotary speed is the necessary step to prove the feasibility of electromechanical deep-sea drilling technology. A test has been designed and constructed to examine three types of drill bits. The results of experiments show that the new low-load polycrystalline diamond compact (PDC) bit has the highest penetration length of 138 mm/15 min under a 300 N load and 250 rpm rotary speed. Finally, field tests with the Jiaolong submersible were used to conduct deep sea experiments and verify the load model, which provides theoretical and technical data on the use of a low-load core sampling drill developed specifically for a deep sea submersible.

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