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Results
Abstract Real time lithology information can tremendously impact drilling by providing input for geo-steering, casing shoe positioning, and subsurface hazards detection. Conventional logging while drilling (LWD) tools typically predict and provide lithology related information at a lag distance behind the drill bit. On the other hand, the sound of the drill bit is generated right at the bit position where it is cutting through the formation rocks. In theory, the sound generated when drilling through different rocks should change in accordance with the stiffness of the rocks. Hence, recording the sound of the drill bit and analyzing its characteristics, such as frequency and amplitude, can reveal information about lithology in real time. A system, hardware and software, is developed to record and process the drill bit sounds in real time. The key challenge in utilizing the sound of the drill bit is minimizing the noise effects generated due to drilling activities especially the rotation rate of the drill bit. We develop methods to minimize the rotation effects and test the methods in the lab settings to determine the optimum method. We then validate the findings from the lab testing with gathered data from a field trial.
- Geology > Rock Type (1.00)
- Geology > Geological Subdiscipline > Geomechanics (0.89)
- Well Drilling > Drill Bits (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Well Drilling > Drilling Measurement, Data Acquisition and Automation > Logging while drilling (0.89)
ROP Optimization and Improved Wellbore Quality with New BHA and Drill Bits Modeling in Soft Shallow Formations
Soares, Matheus Morato (Petrobras) | dos Passos, Adriano Gouveia Lima Gomes (Petrobras) | De Lima, Flank Melo (Petrobras) | De Souza, Mรกrcio Francisco Alves (Petrobras) | de Souza Moreira, Jorge (Petrobras) | Martins, Alรฉssio Flรกvio Vitoretti (Petrobras) | Pioli, Ricardo Magalhรฃes (Petrobras) | Spredemann, Ricardo (Petrobras) | Buzza, Joseph Eduardo Harbi (Petrobras) | Fernandes, Fernando Bastos (Petrobras)
Abstract The paper introduces a method that enables the drilling of a directional trajectory in shallow and unconsolidated formations of riserless phases through the adjustment of parameters, Rotary Steerable System (RSS) settings and PDC bits configurations. The technique was designed for some specific scenarios: exploratory projects in which maintaining verticality in shallow formations/hazards is mandatory, post-salt projects with significant inclination build in riserless phases, and projects that require kickoff in large diameters. There has been a substantial shift in drilling BHAs historically used in riserless drillings with KOP in shallow formations. The use of positive-displacement mud motors (PDM) combined with tricone bits was replaced by RSS and PDCs bits. To enable the change of BHA and the consequent optimization of performance, some parameters and drilling settings were adjusted, such as: an increase in TFA, flow rate reduction, HSI reduction, increase in the frequency of viscous pills, use of the Pump & Dump technic and readjustment of drilling parameters. The main optimization achieved by the adopted methodology is related to the increase in ROP and improvement in wellbore quality. The performance optimization with RSS and PDC bits was observed not only in the directional part of the trajectory, but also in the vertical section. Another relevant aspect of the method is that it enables drilling trajectories in challenging scenarios: riserless phases in large diameters, such as the "chaotic" ones in the Santos Basin post-salt; shallow or friable formations. These actions have allowed the installation of casings or completion tubings without excessive drag and/or bumps, due to the simplification of the directional design and improvement of wellbore quality. An increase of 39,3% in the average ROP in the worst case scenarios and 112,1% in the best ones were observed, as well as a reduction from 20% in caliper ratio washout to 12% (related to less formation washout due to the application of lower flow rates), an improvement in wellbore quality. In addition, the reduction in flowrare and drilling time allows the use of the Pump & Dump technique, which guarantees geomechanical stability at high inclinations, typical of ultraslender projects. The methodology has ensured risk mitigation (involuntary sidetracks, high drag during installation of completion equipment, improvement in cementation hydraulics, absence of overpull margin and reduced bottom drilling torque available), project scope optimization (reduction in the number of phases in pre-salt projects, ultraslender configuration in the post-salt Campos Basin) and increase in ROP and consequent reduction in well construction time.
- North America > United States (1.00)
- Asia (0.93)
- South America > Brazil > Rio de Janeiro (0.28)
- South America > Brazil > Brazil > South Atlantic Ocean (0.24)
- Geology > Rock Type (0.97)
- Geology > Structural Geology > Tectonics > Salt Tectonics (0.96)
- South America > Brazil > Rio de Janeiro > South Atlantic Ocean > Campos Basin > Block P-36 > Roncador Field > Maastrichtian Formation (0.99)
- North America > United States > West Virginia > Appalachian Basin (0.99)
- North America > United States > Virginia > Appalachian Basin (0.99)
- (9 more...)
- Well Drilling > Drilling Operations (1.00)
- Well Drilling > Drilling Equipment > Directional drilling systems and equipment (1.00)
- Well Drilling > Drill Bits > Bit design (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
Successful Milestones Achieved Towards High-Power Laser Drilling
Batarseh, Sameeh I. (EXPEC Advanced Research Center, Aramco, Dhahran, Saudi Arabia) | Alerigi, Damian P. San Roman (EXPEC Advanced Research Center, Aramco, Dhahran, Saudi Arabia) | Marshal, Scott (FORO Energy, Inc., Houston, TX. United States of America) | Reduoane, Kasri (TAQA, Dhahran, Saudi Arabia)
Abstract This paper presents the critical successes towards developing high-power laser (HPL) drilling applications. The accomplishment of the recent field trial in a live well demonstrated that it is possible to mobilize a high-power laser system from the lab to the field and perform the first high-power laser operations. HPLs can penetrate different rock types regardless of their compressive strength in a safe, efficient, and cost-effective manner, providing a long-term solution and alternatives to several conventional operations. Our work developed a comprehensive and stage-gated roadmap to deploy the technology for several upstream applications, including descaling, perforation, and drilling. This strategy is broken into sequential milestones, where each success enables progress to the next level. High-power laser technology has been tested and proven to effectively penetrate all types of rocks, regardless of their strength and composition, such as carbonate, shale, and sandstones. The field-ready HPL system builds on two decades of intense research providing a unique tool that enables safe and environmentally friendly operations. The portable system comprises a laser generator, a nitrogen tank, coiled tubing, energy conveyance cables, and the optical Bottom Hole Assembly (oBHA). A successful milestone has been accomplished by integrating high-power laser components in the field, including splicing the energy conveyance cable to the oBHA and the laser generator in an open space. The tool was deployed using coiled tubing, which carried the energy and telemetry conveyance cable. The test demonstrated that the tool could effectively penetrate casing, cement, and formation in a live well. This achievement is the second successful milestone after HPL surface descaling towards enabling high-power laser drilling. The technology offers unique features to drilling, such as precise control and orientation of the HPL to drill in any direction and through any formation. HPL drilling is independent of the reservoir's stress orientation and magnitude. An HPL system for drilling would be compact, environmentally friendly, and could drill and case simultaneously.
- Europe (1.00)
- North America > United States > Texas (0.47)
- Asia > Middle East > Saudi Arabia (0.28)
- Geology > Geological Subdiscipline (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.35)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.34)
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Drilling > Drilling Operations (1.00)
- Well Drilling > Drilling Fluids and Materials (1.00)
- (9 more...)
Closed-Loop Digital Workflow to Drive Drilling Performance
Li, D. (SLB, Houston, TX, USA) | Cherel, A. (SLB, Houston, TX, USA) | Zhang, P. (SLB, Houston, TX, USA) | Tang, K. H. (SLB, Houston, TX, USA) | Byrd, C. (SLB, Houston, TX, USA) | Mendoza, D. (SLB, Houston, TX, USA) | Procel, E. (SLB, Houston, TX, USA)
Abstract Drilling performance is becoming the top differentiator in the market, especially in highly competitive US land basins. This drives operators to input more energy into the system with higher rev/min, flow, and weight on bit (WOB). In many cases this energy is transformed into drilling dysfunction (shock and vibration [S&V]) instead of higher rate of penetration (ROP). To minimize drilling dysfunction and maximize energy efficiency, a fully digital and closed-loop workflow was developed. The workflow begins with use of a proprietary at-bit sensor, which captures high-resolution at-bit measurements of three-axis acceleration, torsional vibration, and rev/min. The tool is placed inside any existing bit and does not require an additional sub, thus not introducing extra connections, bottomhole assembly (BHA) integrity risk, and/or length. The high-resolution data is automatically processed and analyzed to reveal critical drilling dynamics, which are replicated in a digital model. This creates a highly accurate virtual environment in which to evaluate bit design, eliminating the cost and risk of real-world trial and error, enabling efficient, fit-for-purpose introduction of new technologies. The new digital workflow was first used in a challenging, interbedded application in East Texas. High frequency at-bit measurements were used to develop a new bit and data-driven operating parameter roadmaps. These yielded improved drilling performance, with 69% higher ROP, better dull conditions, and 67% lower vibrations locally, when compared to the direct operator offsets. The workflow was then used in a curve/lateral application in the Permian Basin, known for challenging S&V conditions. Key performance targets were single-run to total depth (TD), high dogleg severity (DLS) output in the curve, and record ROP in the lateral. A new bit was designed, and recommended drilling parameters were defined within the data-driven virtual environment. Field testing confirmed the modelโs predictions, with a 10% average increase in ROP. High-resolution at-bit downhole measurements coupled with digital simulation capabilities have led to development of a new workflow driving the evolution of drill bit design. Instead of the traditional trial and error approach that costs resources, time, and performance, the new workflow with data-enhanced digital modelling and virtual drilling environment enables increased confidence, optimized solutions, and decreased cycle time.
- North America > United States > Texas > Travis Peak Formation (0.99)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- (30 more...)
- Well Drilling > Drilling Operations (1.00)
- Well Drilling > Drilling Equipment (1.00)
- Data Science & Engineering Analytics > Information Management and Systems (1.00)
- (5 more...)
Development of a 3D Discrete Element Method Approach to Study the Evolution of Rock Cutting Mechanism in High-Depth Conditions: Application to Vosges Sandstone
Gonze, Nicolas (Mining Engineering Unit, University of Mons, Belgium) | Descamps, Fanny (Mining Engineering Unit, University of Mons, Belgium) | Tshibangu, Jean-Pierre (Mining Engineering Unit, University of Mons, Belgium)
ABSTRACT: While wells reach deeper and deeper targets, understanding the cutting mechanism under confinement is not yet fully mastered. Among the numerical methods used to study this problem, the Discrete Element Method has already shown promising results, but the evolution of rock behavior with confinement is not always considered. This work proposes a calibration method based on UCS and triaxial tests to represent the evolution of rock behavior with confinement. This calibration procedure is implemented on Vosges Sandstone. The rock model failure envelope is built based on further triaxial tests and agrees with the experimental one. Secondly, linear cutting tests under confinement were implemented on the calibrated model. The results are compared to experimental ones. Their good agreement allows the validation of the proposed approach. INTRODUCTION Understanding the destruction mechanisms in a confined environment due to high depths conditions is essential for optimizing deep drilling, not only for the gas and oil industry but also in the context of deep geothermal energy recovery or CO2 storage. With PDC drill bits accounting for 90% of the distance drilled annually, understanding the cutting mechanism is essential. The current state of the art shows that this mechanism is well understood in atmospheric conditions (Rostamsowlat, 2017), but the impact of high depths conditions (confinement, temperature, and pore pressure) is not yet fully mastered. Different approaches are used to study this topic (experimental, numerical, and study of drilling logs); among them, numerical methods such as the Discrete Element Method (DEM) have demonstrated encouraging results (Carrapatoso et al., 2015; Helmons, 2017). Unfortunately, numerical models sometimes show a lack of representativeness concerning the evolution of the behavior of rock materials with confinement. Therefore, they are unable to reproduce the evolution of the mechanism and typically give cutting forces that differ from the ones measured in laboratories.
- Europe (0.29)
- North America > United States (0.28)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.65)
- Well Drilling > Drill Bits (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
Hot Dry Rock Breaking with PDC Bit Under Various of Impact Loads
Yang, Yandong (School of Petroleum Engineering and Environment Engineering, Yanโan University, China / School of Petroleum Engineering, China University of Petroleum (East China), China) | Yan, Duli (College of Mathematics and Computer Science, Yanโan University, China) | Huang, Feifei (School of Petroleum Engineering and Environment Engineering, Yanโan University, China) | Liao, Hualin (School of Petroleum Engineering, China University of Petroleum (East China), China)
ABSTRACT: Deep dry hot rock geothermal energy is a new type of renewable energy, which is environmental friendly and abundant. The ROP improvement is one of the bottleneck faced in deep hot dry rock drilling. Regarding to the high temperature, strength of hot dry rock, the combination of downhole impact drilling tools and PDC bits has become an effective method to increase the ROP of hot dry rock, and the waveform of the impact load generated by percussive drilling tool is an important factor influencing the ROP of the hot dry rock. Therefore, a 3D polycrystalline diamond compact (PDC)bit-hot dry rock model is established, in order to evaluate the ROP of dry hot rock under the coupling of impact loads. The research results shows that ROP improvement rate of rectangle impact load is the best, which could provide a theoretical basis for the design of rock breaking percussive drilling tool. INTRODUCTION Green, clean and sustainable utilization of hot dry rock geothermal energy, and deep geothermal development are research hotspots and development trends in the world's energy field. As a carbon-neutral energy, geothermal energy will play a role in promoting the realization of carbon emission peak action before 2030, carbon neutrality before 2060, and optimization of industrial and energy structures. Accelerating the development of deep geothermal resources is in line with national major strategic needs. The essence of drilling is to solve the interaction problem between the drill bit and the rock, as well as to improve the drilling speed through the efficiency increase of rock breakage (Ma et al., 1995; Wu et al., 2014). In deep and ultra-deep wells(Guarin et al., 1949; Whiteley and England, 1985; Wanamaker, 1951; Melamed et al., 2000), the difficulty of drilling speed improvement increases due to the complicated geological conditions, the geological uncertainty and the poor drilling ability (An et al., 2012). The study demonstrated that if a dynamic load was applied above the drill bit, the penetration rate could be efficiently improved (Gray et al., 1962; JIN et al., 2012; Han et al., 2006; Han et al., 2005). Due to the various designs of rotary drilling tools as well as of working conditions, impact loads of various characteristics will be generated during impact (Lundberg and Okrouhlik, 2006; Lundberg, 1982). The various impact loads correspond to various incident stress waves. The various incident stress waves correspond to various energy utilization rates, which in turn affect the rock breaking efficiency (Shan et al., 1995; Zhao et al., 2005; Lundberg, 1973a; Lundberg, 1973b). In addition to the experimental method, the finite element was implemented to simulate the rock breakage process (Reddish et al., 2005; Sazid and Singh, 2013). Compared to testing, the 3D simulation could deal with complicated boundary conditions. As an example, the ROP (rate of penetration) or displacement could be obtained under the specific types of dynamic load. Currently, the conventional rock breakage simulation method is to apply a displacement or velocity boundary condition above the drill bit (Kuang et al., 2015). In contrast, the real drilling process involves the dynamic or static load or coupling of static and dynamic load to be sustained, which is not in accordance with the practical operation. Consequently, the rock breakage simulation was conducted with different types of dynamic load in this paper. Through the rock energy utilization rate analysis with exponential, rectangular and sinusoidal stress wave shapes, it was demonstrated that the impact energy utilization rate could reach to approximately 80% when the load was rectangular or sinusoidal (Li and Gu, 1994; Samuel, 1996). Therefore, it was significantly important to study the rock breakage under the various characteristics of the loads.
- Asia > China (0.32)
- North America > United States > Texas (0.28)
- Europe > United Kingdom > England (0.25)
- Energy > Renewable > Geothermal > Geothermal Resource > Hot Dry Rock (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (21 more...)
- Well Drilling > Drill Bits (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
- Reservoir Description and Dynamics > Non-Traditional Resources > Geothermal resources (1.00)
Wells drilled in North Pakistan are notorious for extreme tectonic stresses, pore pressure & geological uncertainties which in turn create significant amount of wellbore instability related challenges. All these problems posit extreme drilling challenges and results in significant NPT. Similar challenges were expected for the drilling of X-2 well being drilled by MOL Pakistan in TAL Block. The well was planned to be drilled to 3965m MD in J-shape profile in 147 days. However, during execution due to geological variance the target was revised to 4150m MD, and the profile was changed to S-shaped to further drill newly identified targets within the target tolerances. Despite the change in profile, increased footage and challenges on T&D, Hydraulics and Geo-mechanics front, the well targets were successfully achieved in 89 days with 30% cost savings from the project. The conundrum for efficient drilling in North Pakistan has been long explored however several short fallings were recorded in past. The Drilling team of MOL Pakistan deployed efficient data analytics, engineering, robust communication, and quick response skills to execute this project. This paper discusses in detail the thought process adopted during planning and execution of the well. The limiters that were posited and how they were managed.
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Drilling > Drilling Operations (1.00)
- Well Drilling > Drill Bits (1.00)
- (3 more...)
Effect of Polishing on Cutting Efficiency and Mechanical Properties of PDC Cutters
Wei, Jiusen (MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing) | Liu, Wei (MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing (Corresponding author)) | Gao, Deli (MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing (Corresponding author)) | Guo, Dameng (Shenzhen Haimingrun Superhard Materials, Ltd)
Summary Polycrystalline diamond compact (PDC) bits equipped with polished cutters have shown improvements in drilling performance compared to the bits using nonpolished cutters. Despite the positive feedback from numerous global field runs, the merits of polished cutters are still not fully studied and not taken seriously, for example, by the bit manufacturers and drilling engineers in China. In this work, the effect of polishing on the rock-cutting efficiency and mechanical properties of PDC cutters was comprehensively analyzed through laboratory tests and field trials. The underlying mechanism was also investigated through theoretical modeling and experimental results. A rock-cutting force model of a single PDC cutter was developed to elucidate the effect of polishing on the rock-cutter interaction considering the friction between the cutter surface and rock cuttings. The results revealed that the polished cutter has better rock-cutting efficiency because the polishing reduces the friction on the cutter surface. This reduction in friction facilitates the evacuation of rock cuttings from the crushing zone and plastic flow zone, leading to lower mechanical specific energy (MSE) compared to the nonpolished diamond surface. Moreover, the polished cutters exhibit improved thermal stability and better impact fatigue resistance while maintaining comparable wear and impact resistance to nonpolished cutters. To further validate the findings, two field trials were conducted in Sinopec Shengli Oilfield. The first field trial using four PDC bits with polished cutters and one bit with nonpolished cutters found that the bits with polished cutters obtained a higher rate of penetration (ROP) in drilling hard and plastic mudstone, which agreed well with the theoretical and experimental results. In the second field trial, it was noted that the polished cutters presented comparable mechanical properties to nonpolished cutters, which was also consistent with experimental results. However, the advantages of polished cutters in thermal stability and impact fatigue resistance were not distinguished in the field trials. This work elucidated the beneficial effect of polishing in enhancing the drilling efficiency of PDC cutters and, more meaningfully, without sacrificing the mechanical properties of PDC cutters, which provided solid evidence to convince bit manufacturers and drilling engineers for the broader adoption of polished cutters.
- Europe (1.00)
- North America > United States > Texas (0.28)
- Asia > China > Shandong Province (0.24)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.34)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 054 > Block 31/6 > Troll Field > Sognefjord Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 054 > Block 31/6 > Troll Field > Heather Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 054 > Block 31/6 > Troll Field > Fensfjord Formation (0.99)
- (11 more...)
- Well Drilling > Drill Bits > Bit design (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
Experimental and Numerical Investigation on Rock Breakage Mechanisms of a Conical Diamond Element
Xiong, Chao (China University of Petroleum) | Li, Xinlong (China University of Petroleum) | Huang, Zhongwei (China University of Petroleum) | Shi, Huaizhong (China University of Petroleum) | He, Wenhao (China University of Petroleum) | Chen, Zhenliang (China University of Petroleum)
ABSTRACT The conical diamond element (CDE) is an innovative conical-shaped 3D cutter, which exhibits high rock-breaking efficiency in hard formation. But there are few researches on the rock breakage mechanism of CDE cutters. In this paper, a series of single cutter tests were conducted on granite. The rock breakage process, the initiation and propagation of micro-cracks, the surface topography and fracture morphology of the cutting groove and large-size debris were analyzed. A three-dimensional rock cutting model with a CDE cutter was established using the finite element method to study the stress distribution and rock damage evolution during the cutting process. The results show that the cutting process can be divided into two parts: crushing and chipping. There is a spherical stress concentration area formed at the tip of the CDE cutter. The rock breakage mechanism of the CDE cutter can be summarized as follows: the rock at the CDE cutter tip occurs shear-compression failure; the rock in front of the CDE is broken under the tensile action; tensile micro-cracks propagating to the rock inside can deteriorate rock strength. The key findings of this work will help to reveal the rock breakage mechanisms and provide guidelines for CDE bits design. INTRODUCTION Polycrystalline Diamond Compact (PDC) drill bits have been widely used for drilling wells in the exploitation of hydrocarbon and geothermal resources (Bellin et al. 2010) due to the high rock-breaking efficiency and long duration life. However, for deep and ultra-deep drilling, the conventional PDC cutter is facing the challenges of serious impact and wear damage (Brett et al. 2012). In order to improve the drilling performance of PDC drill bits in hard formation, Durrand et al. (2010) invented Conical Diamond Element (CDE), which has nearly twice as thick as polycrystalline diamond layer than the conventional PDC cutter, so the wear resistance and impact resistance is improved approximately 25% and 100% respectively (Azar et al. 2013). Since CDE was invented, the hybrid PDC drill bit, on which the CDE is strategically positioned at the bit center or behind the primary conventional PDC cutter, has drilled more than 26 million feet in hard and interbed formation. Based on the records, the hybrid PDC bits increased footage up to 77% with corresponding Rate of Penetration (ROP) increases up to 29% in the Permian Basin (Radhakrishnan et al. 2016).
- Asia (0.95)
- North America > United States > Texas (0.24)
- North America > United States > New Mexico (0.24)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Igneous Rock > Granite (0.37)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (21 more...)
- Well Drilling > Drill Bits > Bit design (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
Analysis of the Influence of Deep/Ultra-Deep Rock Mechanical Properties Difference on Rock Breaking Efficiency of PDC Bit and Research on Cutter Shape Optimization-Taking Shunbei Oilfield as an Example
Zhuoxin, Dong (China University of petroleum) | Hui, Zhang (China University of petroleum) | Kerou, Liu (China University of petroleum) | Yufei, Chen (China University of petroleum)
ABSTRACT Polycrystalline diamond compact (PDC) is widely used in petroleum engineering drilling due to its strong wear resistance, fast penetration rate and high bit footage. But with the increase of formation depth, the formation rocks become dense, high strength and difficult to be destroyed under the action of geostress, which makes the drilling speed in deep/ultra-deep layers slow. In this paper, the characteristic law of rock strength characteristics changing with well depth is analyzed, and the numerical simulation model of single cutter rock breaking based on the Cohesive element is established. According to the numerical simulation results and the change of confining pressure with depth in Shunbei Oilfield, the suitable depth range of each cutters is recommended by layers. The results show that the rock strength characteristics gradually increase with the depth, and the impact on the rock breaking of the cutting teeth is mainly the increase of the weight on bit and the cutting force. By analyzing the numerical simulation results, the circular cutter is suitable for shallow formation, the curved cutter is suitable for medium and deep well section, and the triangular cutter is suitable for ultra deep formation. INTRODUCTION Oil and natural gas are the main raw materials for obtaining energy in the world today. With the improvement of the development level of oil and natural gas, the depth of recoverable oil reservoirs is getting deeper and deeper, and the depth and number of deep/ultra-deep wells are also increasing. (Wang HG, Huang HC, Bi WX, et al. 2021). For these deep/ultra-deep wells, the traditional drilling methods cannot effectively drill, and it is difficult to meet the needs of rapid deployment of well patterns in the oilfield. (Tian S, Huang Z, Niu J, et al. 2009). Therefore, it is quite necessary to carry out the research on rock breaking law of PDC cutters for deep/ultra-deep layers.
- Asia > China (0.50)
- North America > United States (0.47)
- Research Report > New Finding (0.35)
- Research Report > Experimental Study (0.35)
- North America > United States > South Dakota > Williston Basin > Bakken Shale Formation (0.99)
- North America > United States > North Dakota > Williston Basin > Bakken Shale Formation (0.99)
- North America > United States > Montana > Williston Basin > Bakken Shale Formation (0.99)
- North America > United States > Louisiana > China Field (0.97)
- Well Drilling > Wellbore Design > Rock properties (1.00)
- Well Drilling > Drill Bits > Bit design (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)