Original Title: [Drilling] Industry's First Adaptive Bit High Effect on Stick-Slip Vibration Baker Hughes has released the TerrAdapt, a self-adjusting depth-of-cut (DOC) control element that automatically adjusts aggressiveness, reduces downhole bit failure, and reduces vibration, stick-slip effects, and shock loading. From | Baker Hughes Compiler | Zheng Sihe Erya ................................................................................................ With the development of petroleum industry, the focus of petroleum exploration and development has gradually shifted to deep wells and ultra-deep wells. For example, a large number of oil resources are located in deep strata in Sichuan, Tarim and other blocks in China. With the increase of well depth, the hardness and plasticity of rock increase, the drillability becomes worse, and the penetration rate decreases. The field drilling data show that the average ROP in the deep section is only 15% ~ 30% of the average ROP in the upper section, and even lower in some areas. The research shows that stick-slip vibration is one of the important reasons for the decrease of penetration rate. Downhole failures often result in inefficient drilling and costly tool failure. More than half of the time in drilling operation will be accompanied by stick-slip phenomenon, and the stick-slip vibration of drilling string is an important reason for the premature failure of downhole drilling tools and bits. Baker Hughes recently introduced the industry's first adaptive drill bit, the TerrAdapt ™ adaptive drill bit, which reduces the frequency of downhole failures through its own automatic control and greatly improves the economic benefits of drilling. With the industry's first self-adjusting depth-of-cut control element, the TerrAdapt drill bit can adjust its aggressiveness to the formation it is drilling into, reducing vibration, stick-slip effects, and shock loads. From the operator's perspective, this means faster, smoother drilling and longer tool life, significantly reducing non-productive time. The DOC is generally defined as the axial distance that the drill bit bites into the formation in one rotation. Controlling DOC can eliminate the stick-slip vibration of the bit, form a high-quality smooth borehole, avoid premature failure of the cutter teeth, and prolong the service life of the bit. DOCC (Depthof Cut Control) technology was introduced for shock absorption at the beginning, but with the development of fixed tooth PDC bit, it is faced with the challenge of completing different sections of a well with a single bit (meeting the requirements of eliminating stick-slip in some sections and high drilling speed in some sections at the same time). Reasonable application of DOCC technology to optimize bit drilling performance has become the focus of attention of major companies. In general, most of the intervals will be drilled in many different formations, each of which has different rock types, but the current PDC bit design often has only one fixed DOC control setting, which can only achieve optimal drilling for one of the rock types. The bit often vibrates in the transition between different rock types, resulting in a stick-slip effect, so a fixed DOC bit may be able to drill smoothly in some areas,
down the hole bit
, but it is easy to be very unstable and inefficient in other areas. Expand the full text When the drill string is stuck, the bit stops rotating; at this time, the drill string continues to twist under the rotation of the rotary table. When the energy accumulated in the drill string is enough to overcome the friction torque between the bit and the formation, the bit will rotate at a speed twice or several times that of the rotary table. The bottom drilling tool will oscillate more and the rotation torque of the bit will also fluctuate violently. In the process of deep well drilling, varying downhole lithology, severe heterogeneity, large resistance moment exerted on the bit at the bottom hole, intermittent bit bounce and frequent longitudinal vibration of the drill pipe are the main reasons for tooth loss, tooth breakage, bearing failure and downhole tool damage, which seriously restrict the drilling speed. In this case, the operator has to choose to replace the drill bit.
The TerrAdapt bit incorporates a self-adjusting DOC element that automatically extends depending on formation conditions to form the best DOC, avoiding vibration and stick-slip effects when the bit encounters different rock types or intervals. After the well section with high stick-slip effect is drilled, the element can be recovered and restored to the maximum ROP for drilling. These elements also cushion any sudden impact on the bit face, reducing damage to the TerrAdapt drill cutter and other BHA hardware and electronics. Oil circle original, oil circle official account: oilsns "I believe that the TerrAdapt adaptive drill will make a huge difference to our users," said Scott Schmidt, assistant manager of the drill division at Baker Hughes. "The stick-slip effect costs our users millions of dollars every year, and now we can easily solve this problem. Instead of trying to figure out how to reduce the consequences of stick-slip effects, we should focus on another key point-fast drilling and zero failure. Recently, the TerrAdapt bit proved its strength in the Delaware Basin by improving ROP. Drilling through the same set of interbeds, the TerrAdapt bit improved ROP by 27% over the adjacent well, reduced torque variation by 90%, greatly reduced stick-slip effects, and increased drilling footage by 713 feet (27%), while using much less effort than a conventional PDC bit. Oil circle original, oil circle official account: oilsns Application case An operator in Reeves County, Texas, encountered shale, limestone, and salt formations in a 12-1/4-inch well. The drilling performance was extremely unstable. Ultra-high torque fluctuations and severe stick-slip effects greatly affected the drilling efficiency. Downhole tool failures further contributed to the soaring non-production time and cost. In order to minimize downtime, the operator selected the TerrAdapt bit. A single trip completed 3,355 feet with a 27% increase in ROP, an average ROP of 168 feet/hour, a 45% reduction in average torque, a 90% improvement in stability, and a 45% increase in mechanical specific energy compared to the standard PDC bit in the adjacent well. The entire drilling operation greatly reduced stick-slip effects and torsional vibration,
Mining Drilling Equipment
, and ensured that the BHA remained intact throughout the process. Oil circle original, oil circle official account: oilsns ................................................. End ................................................. Focus on oil and gas and walk with independent thinkers! Oil circle original, oil circle official account: oilsns Return to Sohu to see more Responsible Editor:.
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