...-pronged approach is employed in the monitoring of drilling bit condition in addition to estimating rock drillability to keep track of change in lithology. First step involves developing a model for polycrystalline compact drilling (PDC) bits. It examines micro forces at the bit cutters and then upscales...

... to deliver high quality, cutter-by-cutter dull grades connected with the drilling meta data from a drilling records database. The model is trained on more than 20,000 images which classify cutter primary characteristics into worn cutter, chipped cutter, broken cutter, spalled cutter, delaminated, bond...

... bit wear location and the type of cutter damage was also a challenge in this case. A sensor at bit to measure downhole dysfunctions, in combination with a digital imaging system that calculates the bit damage, was used to carry out a comprehensive engineering analysis to determine the bit design...

... Abstract There is considerable value in automatically quantifying cutter damage from drill bit pictures. Current approaches do not classify cutter damage by type, i.e., broken, chipped, lost, etc. We, therefore, present a computer vision model using deep learning neural networks to automate...

... this new schema. In comparison to the previous bit dull grading process, more details about the drill bit such as cutter damage type have been added to the new schema. Additionally, capturing pre-run and post-run bit images is recommended to enable detailed bit forensic analysis into root causes...

... learning log analysis well logging drilling operation wellbore integrity drillstring design bit design drilling equipment drill pipe selection drillstring dynamics cutter downhole data upstream oil & gas information real time system bit selection artificial intelligence wellbore design...

... Abstract Historically polycrystalline diamond compact cutters have consisted of a planar cutting face on a cylindrical diamond table. For decades industry has been aware of the potential drilling performance gains from forming these cylindrical cutters into other geometrical shapes. These early...

... Once the rock sample is retrieved and dried, each groove is marked with a test number, photographed, and measured with a caliper to determine the achieved DOC (as shown Fig. 4 ). The measured data are then saved in an Excel file together with the test parameters, including type of rock, cutter...

... Generally, most of the research relating to cutter-rock interaction revolves around investigating the influence of confining pressure, cutter geometry design parameters (back rake and side rake angles), cutting area and wear height, and rock drillability. Abstract Wired drillpipe with along...

...) to achieve brittle rock failure. It was eventually possible to increase WOB to the structural limit of the bits (i.e., 68k lbs on 10-5/8" PDC). The bit vendor was engaged continually in daily analysis of digital data and dulls, and bits were redesigned to redistribute cutter wear, increase aggressiveness...

... that needed to grade dulls. Eight types of information about a worm bit can be recorded similar to the existing IADC grading system. The first four spaces explain the cutting structure. Unlike the first two spaces for "Inner" and "Outer" rows of the cutters of the existing IADC grading system, a single space...

... under in-situ conditions and confinements from the inefficiency induced by the drilling system with its continuously varying dynamics and bit wear. An attempt to identify the basis for drillability facies; e.g., mechanical specific energy, is not possible unless the bit wear and cutter conditions...

.../ use of drilling mechanics calculations to better understand the physical conditions which resulted in drilling dysfunction. This inhibits the ability for: The IADC dull grading was first developed in 1987 ( Clark et al. 1987 ) to enable a consistent assessment of fixed cutter bits...

... induced using a controlled linear actuator at the cutter-rock interface, in low frequency regime (up to 5 Hz) using a rotary experimental setup, based on state-of-the-art modified lathe machine. Through imposition of bit kinematics of angular velocity and rate of penetration (ROP), a PDC cutter was used...

... Abstract This paper describes the development of an improved polycrystalline diamond cutter (PDC) drilling performance simulation in 3D which includes worn cutters. A polygonal mesh model is used to improve the geometric data needed for the drilling performance model calculations. Methods...

... of the cutters that were damaged. Using the 2D bit images (which can be obtained at the rig site), a convolutional neural network along with other image processing techniques were used to identify the individual cutters, their position on the bit, the degree of wear on each cutter. A classifier was then built...

...Finite Element Analysis on Cutter Structural Integrity Abstract Robustness of round and v-shaped polycrystalline diamond compact (PDC) cutters against mechanical and thermal load was evaluated. Forensic analysis was used to estimate the range of loads and depths-of-cut (DOC) that cause...

... of the outside cutters, which tends to occur if hard streaks are exited with high WOB and depth of cut (DOC). The second is continuous wear of the outside cutters that occurs if lower WOB is used to avoid the tangential overload. There was no operating window in which any given WOB did not enable one...

... behavior under HFTO can be fully described. Cyclical torque loading of differing magnitudes and frequencies were observed for different BHA components depending on HFTO vibration mode, HFTO severity and BHA design. PDC cutters were subjected to different cyclical loading depending on bit design, formation...

... Abstract The oil-and-gas drilling industry has been utilizing modified PDC cutter geometry for improving performance. One of the first reinforcements of beliefs in positive effects of edge geometry changes was in report by Lin et al. in 1992 from conducting laboratory experiments on cutters...