Kinematic and rock-breaking characteristics of new drill bit with swirling bottom-hole model

2015 ◽  
Vol 50 (3/4) ◽  
pp. 305 ◽  
Author(s):  
Jialin Tian ◽  
You Li ◽  
Lin Yang ◽  
Chuanhong Fu ◽  
Yonghao Zhu ◽  
...  
Keyword(s):  
Rock Breaking ◽  
Drill Bit ◽  
Bottom Hole ◽  
Hole Model

Kinematic and bottom-hole pattern analysis of a composite drill bit of cross-scraping

2016 ◽  
Vol 231 (17) ◽  
pp. 3104-3117 ◽  
Author(s):  
Yingxin Yang ◽  
Chunliang Zhang ◽  
Lian Chen ◽  
Yong Liu
Keyword(s):  
Polycrystalline Diamond ◽  
Rock Breaking ◽  
Speed Ratio ◽  
Drill Bit ◽  
The Novel ◽  
Analysis Model ◽  
Fracture Failure ◽  
Bottom Hole ◽  
Geometric Relationship ◽  
Polycrystalline Diamond Compact

For improving the drilling efficiency of polycrystalline diamond compact drill bit, a novel polycrystalline diamond compact drill bit is presented with a new rock-breaking method named as cross-scraping. In the novel polycrystalline diamond compact drill bit which is referred to as a composite drill bit, polycrystalline diamond compact cutters are mounted on rotary wheels as major cutting elements, and as a result, mesh-like scraping tracks are formed in the outer radial area of the bottom-hole. Rock-breaking method of the composite drill bit causes both shearing and fracture failure of the bottom-hole rock, which will greatly increase the rock-breaking efficiency and will prolong the bit service life. By analyzing the complex motion of cutters on the composite drill bit, velocity and acceleration models of the cutters, as well as wheel/bit speed ratio model of the bit are established in accordance with the geometric relationship between cutters and bit body in a compound coordinate system. In simulation examples, motion tracks, velocity and acceleration features of the cutter and especially the bottom-hole pattern are analyzed. Further, indoor experiments are conducted to test the mesh-like bottom-hole pattern and rock-breaking features, which have proved the accuracy of the analysis model of the composite drill bit.

The First Multilateral Well in Eastern Siberia on the Separated Oil Reservoirs

2021 ◽  
Author(s):  
Ruslan Fanisovich Gataullin ◽  
Stanislav Evgen’evich Ter-Saakov ◽  
Evgenij Vladimirovich Nikulin ◽  
Dmitriy Pavlovich Stifeev ◽  
Alexey Vyacheslavovich Filatov
Keyword(s):  
Low Frequency ◽  
Cost Effective ◽  
Drill String ◽  
Hole Drilling ◽  
Drill Bit ◽  
Eastern Siberia ◽  
Water Contact ◽  
Bottom Hole ◽  
Drilling Technology ◽  
Equipment Failures

Abstract This article describes engineering and technology solutions developed to successfully construct unconventional and unique horizontal well at the field of Eastern Siberia targeted to two isolated formations with an option to shut-off top Botuobinsky horizon after gas breakthrough and produce oil from underlying Ulakhansky bed further on. As oil-water contact in the lower part of Ulakhansky horizon makes fracturing the well inexpedient, multi hole drilling technology was implemented enabling drainage of the reserves that are far from the main borehole. The main objective of this well is to deplete Botuobinsky horizon subsequently shutting it off and continuing to recover petroleum reserves from Ulakhansky pay zone. Constructing such well is cost-effective, as it requires drilling only one intermediate casing interval instead of two. Accumulated experience of drilling and completing multi hole wells was used to ensure successful well construction; also, geological and stratigraphic data as well as possible complications while drilling Botuobunsky and Ulakhansky formations were analyzed in-depth. The following appliances were selected to meet the objective: –Bottom-hole equipment enabling drilling abrasive formations under conditions of high vibrations;–Special line of drill bits to ensure high ROP and successful sidetracking without additional tripping;–RSS with 152.4 mm drill bit. The goal set by the operating company was achieved through multi-faceted approach to performing the task, efficient cooperation of engineering technical services and continuous monitoring of output data while drilling. All that combined delivered the results listed below: –Sidetracks were carried out in an open horizontal hole without cement plugs and additional tripping for drill bit or BHA.–Minimized bottom-hole equipment failures under condition of increased high-frequency vibrations from bit while drilling hard formations due to implementation of modular PDM with data-transmitting channel.–Minimized bottom-hole equipment failures under condition of increased low-frequency vibrations from drill string with Hard Bending due to improved BHA design and optimized drilling parameters selection.–Liner was effectively run to Botuobinsky and Ulakhansky reservoirs with an option to shut-off the former after depletion and gas breakthrough. This well is the first one targeted at two isolated formations in East Siberia.

Hybrid Drill Bit Technology on Performance Motor Bottom Hole Assembly Yields Breakthrough Drilling Performance in Kuwait

2019 ◽  
Author(s):  
Waleed Al-Baghli ◽  
Mohammad Al-Salamin ◽  
Sulaiman Sulaiman ◽  
Atef Abdelhamid ◽  
Ali Alnemer ◽  
...  
Keyword(s):  
Drill Bit ◽  
Drilling Performance ◽  
Bottom Hole ◽  
Bottom Hole Assembly

Dynamic research and experimental analysis of a longitudinal–torsional coupled impactor

2021 ◽  
pp. 095440622110599
Author(s):  
Jialin Tian ◽  
Zhe Deng ◽  
Hongzhi He
Keyword(s):  
Theoretical Analysis ◽  
Experimental Test ◽  
Drilling Fluid ◽  
Rock Breaking ◽  
Torsional Stiffness ◽  
Drilling Process ◽  
Drill Bit ◽  
Test Results ◽  
Stick Slip ◽  
Innovative Design

The rock breaking efficiency of drill bit is deeply affected with the increase of drilling depth. The increase length of the drill string leads to torsional stiffness decrease, which may even result in the stick-slip phenomena. In order to improve the rock breaking efficiency and reduce the stick-slip, this paper proposed a longitudinal–torsional coupled impactor. The internal working mechanism was carried out by theoretical analysis and experimental test. Moreover, comparing the computation and test results, the following conclusions can be obtained and verified. This innovative design can provide appropriate longitudinal-torsional coupled impact to drill bit during drilling process, and the movement of the hammer and pendulum is periodic. With the increasing flow rate of drilling fluid, this tool can generate corresponding larger impact force, torque and higher impact frequency. The theoretical analysis results are consistent with the experimental test results, which verify the reliability of the innovative design and the accuracy of theoretical analysis. This paper can provide reference for the innovative design of downhole drilling tool, the development of drilling dynamics and the improvement of drilling efficiency especially in the conditions of complex and ultra-deep wells.

Stick-slip investigation of dual drilling and reaming bottom hole assembly

2021 ◽  
pp. 095440622110184
Author(s):  
Mohammed F Al Dushaishi ◽  
Mortadha T Alsaba ◽  
Ahmed K Abbas ◽  
Tariq Tashtoush
Keyword(s):  
Field Studies ◽  
Drill Bit ◽  
Coupled Vibration ◽  
Stick Slip ◽  
Premature Failure ◽  
Bottom Hole ◽  
Vibration Model ◽  
Dual Action ◽  
Bottom Hole Assembly ◽  
Element Approach

Drillstring vibration is known to cause failures of drilling equipment, including the drill bit. In particular, stick-slip vibration has been known for causing premature failure of the drill bit, hence resulting in reducing the rate of penetration. With dual reaming while drilling, cutting forces are acting on the drillstring due to the simultaneous contact of the reamer and the drill bit. Field studies have shown dramatic changes in the dynamics of the bottom hole assembly due to the dual cutting actions. This paper investigates the dynamics of bottom hole assembly for dual reaming and drilling operation, with emphasis on stick-slip vibrations due to the reamer and the bit contact with the formation. A coupled vibration model representing the drillstring was created to simulate the stick-slip vibrations caused by the bit and reamer interactions using the finite element approach. The numerical analysis showed an elevated stick-slip vibration due to the dual-action of the reamer and the bit. Sensitivity analysis indicated that the cutter aggressiveness for the bit and the reamer are the most significant parameters affecting stick-slip behavior.

scholarly journals Rock-Breaking Properties Under the Rotatory Impact of Water Jets in Water Jet Drilling

2019 ◽  
Vol 9 (24) ◽  
pp. 5417 ◽  
Author(s):  
Zhaolong Ge ◽  
Lei Wang ◽  
Man Wang ◽  
Zhe Zhou ◽  
Songqiang Xiao ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Rotation Speed ◽  
Impact Angle ◽  
Rock Breaking ◽  
Water Jet ◽  
Drill Bit ◽  
Rock Breakage ◽  
Jet Impact ◽  
Tension State ◽  
Optimum Water

Water jet drilling is widely used to develop coalbed methane reservoirs. The water jet drill bit is the core component, and a self-rotating bit is an economical bit because of its high rock-breaking efficiency and low energy consumption. Because the important parameters concerning the rock-breaking efficiency of these drill bits are unclear, this study carried out rock-breaking experiments on water jet rotation under different conditions of drill bit rotation speed, jet pressure, and jet impact angle. How the rock was fractured and eroded under these different conditions was analyzed. The results show that the volume of rock broken under rotary jet erosion increases exponentially with increasing jet pressure. The rock-breaking depth is the most important factor that influences the volume of rock broken, whereas the diameter of the area broken is a secondary factor. There is an optimum water jet rotation speed for the most efficient rock breakage, and this rotation speed is positively correlated with jet pressure. There is also an optimum water jet impact angle for rock breaking, and, in our experiments, this angle was 10°. The rotary impact of the water jet causes the rock to be in a three-way tension state, and this reduces the water cushion effect and jet reflection. This study can be used as a reference and guide for optimizing the design of self-rotating water jet bits and the determination of reasonable drilling parameters.

scholarly journals Investigation of the Cross-Cutting Polycrystalline Diamond Compact Bit Drilling Efficiency

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Chun-Liang Zhang ◽  
Ying-Xin Yang ◽  
Hai-Tao Ren ◽  
Can Cai ◽  
Yong Liu ◽  
...  
Keyword(s):  
Cutting Force ◽  
Polycrystalline Diamond ◽  
Rock Breaking ◽  
The Novel ◽  
Cutting Efficiency ◽  
Bottom Hole ◽  
Pdc Bit ◽  
The Cross ◽  
Polycrystalline Diamond Compact ◽  
Cutting Modes

The parallel track scraping principle of conventional PDC bits largely limits the cutting efficiency and working life in deep formations. Cross-cutting polycrystalline diamond compact (PDC) bit may be an efficient drilling tool that increases the rock-breaking efficiency through both cross-cutting and alternate-cutting modes of the PDC cutter. The motion track equation of the cross-cutting PDC bit was derived by using the compound coordinate system, and the motion track was analyzed. Meanwhile, through the unit experiment and discrete element simulation, the cutting force, volume-specific load, and crack propagation were analyzed under different cutting modes. Through establishing a nonlinear dynamic model of the bit-rock system, the speed-up mechanism of the novel bit was analyzed based on rock damage, rock stress state, and motion characteristic of the bit during the rock-breaking process. Compared with unidirectional cutting, cross-cutting produces less cutting force, more brittle fracture, and a greater decrease of formation strength. The novel PDC bit can put more rock elements into a tensile stress condition than a conventional PDC bit, and the plastic energy dissipation ratio of the cross-cutting PDC bit is lower while the damage energy consumption ratio is higher than they are for conventional bits, which is beneficial to increasing the ratio of fracture failure and improving rock-breaking efficiency. Laboratory drilling tests show that the cross-cutting PDC bit can create mesh-like bottom-hole features. Drilling contrast experiments show that a mesh-like bottom-hole pattern can be obtained by using the cross-cutting PDC bit, of which the ROP is obviously higher than that of the conventional bit when drilling in sandstone or limestone formation. Meanwhile, the influence of deviation angle, weight on bit, and rock properties on cutting efficiency of the cross-cutting PDC bit are studied.

The Development of the Microwave Assisted Rock Breaking Device

2014 ◽  
Vol 900 ◽  
pp. 627-630 ◽  
Author(s):  
Guang Tong Feng ◽  
Zong Gang Wang ◽  
Zhen Wei
Keyword(s):  
Service Life ◽  
Hot Spot ◽  
Near Field ◽  
Rock Breaking ◽  
Field Energy ◽  
Drill Bit ◽  
Microwave Generator ◽  
Impact Wear ◽  
Microwave Assisted ◽  
Wear And Tear

Microwave crag broken is a thermal assisted rock breaking method which could melt rocks. Microwave assisted rock breaking method will not bring new impact, wear and tear, instead, the microwave pretreatment on the rock reduces the difficulty of breaking rock and prolongs the service life of the drill bit. This microwave generator accumulates the microwave near the hot spot to soften and melt the rock through generating and transmitting the microwave. And we had experimented with the microwave generator to penetrate the wood, and weaken the strength of the rock. And the experiment proved the scheme of the microwave assisted rock breaking through microwave near field energy and the thermal runaway effect is feasible.

A Study on the Mechanism of Bottom Hole Hydraulic Pulse Increasing Drilling Rate

2011 ◽  
Vol 354-355 ◽  
pp. 621-626
Author(s):  
Hong Jian Ni ◽  
Rui He Wang ◽  
Wei Qiang Song ◽  
Hui Fang Song
Keyword(s):  
Flow Field ◽  
Stress Condition ◽  
Rock Breaking ◽  
Field Application ◽  
Drilling Rate ◽  
Rock Stress ◽  
Bottom Hole ◽  
Start Up ◽  
Well Depth ◽  
Hydraulic Pulse

Practically, the distribution and variation of the bottom-hole hydraulic energy has significant influence on drilling rate, and it’s helpful to induce bottom-hole hydraulic pulse to improve the rock breaking and drilling efficiency. The analysis of bottom-hole rock stress condition and cuttings start-up mechanism indicates that, bottom-hole hydraulic pulsation can decrease the bottom hole pressure, reduce the fracture strength of rock, and strengthen bottom-hole purification, thus improve the efficiency of rock breaking and drilling. The higher the pulsation value is, the more effective of the acceleration of the drilling rate, while well depth increases, the acceleration effect diminishes gradually. Simulation of jet flow field drilled by 3-nozzle 3-cone bit, combined with field application, verify the mechanism that bottom-hole hydraulic pulsation could improve ROP. The result of the study provides a basis for the development of practical technology.

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