Effect of Sequential Drilling Process on In-situ Bone Temperature

2019 ◽  
pp. 371-377
Author(s):  
Varatharajan Prasannavenkadesan ◽  
Ponnusamy Pandithevan
Keyword(s):  
Drilling Process

Evaluation of Ultrasonic Methods for In-Situ Real-Time Characterization of Drilling Mud

2005 ◽  
Author(s):  
Judith Ann Bamberger ◽  
Margaret S. Greenwood
Keyword(s):  
Physical Properties ◽  
Real Time ◽  
Speed Of Sound ◽  
Direct Contact ◽  
Drilling Fluid ◽  
Drilling Process ◽  
Drilling Mud ◽  
Well Control

A real time multi-functional ultrasonic sensor system is proposed to provide automated drilling fluid monitoring that can improve the capability and development of slimhole and microhole drilling. This type of reliable, accurate, and affordable drilling fluid monitoring will reduce the overall costs in exploration and production. It will also allow more effective drilling process automation while providing rig personnel a safer and more efficient work environment. Accurate and timely measurements of drilling fluid properties such as flow rate, density, viscosity, and solid loading are key components for characterizing rate of drill penetration, providing early warning of lost circulation, and for use in real-time well control. Continuous drilling fluid monitoring enhances drilling economics by reducing the risk of costly drilling downtime, increasing production performance, and improving well control. Investigations conducted to characterize physical properties of drilling mud indicate that ultrasound can be used to provide real-time, in-situ process monitoring and control. Three types of ultrasonic measurements were evaluated which include analysis of in wall, through wall and direct contact signals. In wall measurements provide acoustic impedance (the slurry density and speed of sound product). Through wall and direct contact measurements provide speed of sound and attenuation. This information is combined to determine physical properties such as slurry density, solids concentration and can be used to detect particle size changes and the presence of low levels of gas. The measurements showed that for the frequency range investigated in-wall measurements were obtained over the slurry density range from 1500 to 2200 kg/m3 (10 to 17 pounds solids per gallon of drilling fluid). Other measurements were obtained at densities in the 1500 to 1800 kg/m3 range. These promising measurement results show that ultrasound can be used for real-time in-situ characterization of the drilling process by monitoring drilling mud characteristics.

scholarly journals Drilling Load Model of an Inchworm Boring Robot for Lunar Subsurface Exploration

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Weiwei Zhang ◽  
Shengyuan Jiang ◽  
Dewei Tang ◽  
Huazhi Chen ◽  
Jieneng Liang
Keyword(s):  
Energy Efficient ◽  
Low Cost ◽  
Lunar Regolith ◽  
Drilling Process ◽  
Load Model ◽  
The Past ◽  
Drilling Parameters ◽  
Efficient Control ◽  
Exploration Mission

In the past decade, the wireline robot has received increasing attention due to the advantages of light weight, low cost, and flexibility compared to the traditional drilling instruments in space missions. For the lunar subsurface in situ exploration mission, we proposed a type of wireline robot named IBR (Inchworm Boring Robot) drawing inspiration from the inchworm. Two auger tools are utilized to remove chips for IBR, which directly interacted with the lunar regolith in the drilling process. Therefore, for obtaining the tools drilling characteristics, the chips removal principle of IBR is analyzed and its drilling load model is further established based on the soil mechanical theory in this paper. And then the proposed theoretical drilling load model is experimentally validated. In addition, according to the theoretical drilling load model, this paper discusses the effect of the drilling parameters on the tools drilling moments and power consumption. These results imply a possible energy-efficient control strategy for IBR.

scholarly journals Proposal for a New Bioactive Kinetic Screw in an Implant, Using a Numerical Model

2022 ◽  
Vol 12 (2) ◽  
pp. 779
Author(s):  
Carlos Aurelio Andreucci ◽  
Abdullah Alshaya ◽  
Elza M. M. Fonseca ◽  
Renato N. Jorge
Keyword(s):  
Numerical Model ◽  
Dental Implant ◽  
Complex Geometry ◽  
Healing Process ◽  
Drilling Process ◽  
Bone Material ◽  
Stress And Deformation ◽  
Explicit Dynamic ◽  
Bone Particles

A new biomechanism, Bioactive Kinetic Screw (BKS) for screws and bone implants created by the first author, is presented using a bone dental implant screw, in which the bone particles, blood, cells, and protein molecules removed during bone drilling are used as a homogeneous autogenous transplant in the same implant site, aiming to obtain primary and secondary bone stability, simplifying the surgical procedure, and improving the healing process. The new BKS is based on complex geometry. In this work, we describe the growth factor (GF) delivery properties and the in situ optimization of the use of the GF in the fixation of bone screws through a dental implant. To describe the drilling process, an explicit dynamic numerical model was created, where the results show a significant impact of the drilling process on the bone material. The simulation demonstrates that the space occupied by the screw causes stress and deformation in the bone during the perforation and removal of the particulate bone, resulting in the accumulation of material removed within the implant screw, filling the limit hole of the drill grooves present on the new BKS.

On the Role of Bit Cutter-on-Rock Tribometry to Aid the Drilling Process for New Energy Resources

2011 ◽  
Author(s):  
Patrick S. M. Dougherty ◽  
Randyka Pudjoprawoto ◽  
C. Fred Higgs
Keyword(s):  
White Light ◽  
Rock Cutting ◽  
Energy Resources ◽  
Depth Of Cut ◽  
Drilling Process ◽  
Optical Interferometer ◽  
New Energy ◽  
Study Techniques

In this study, techniques for studying the Tribology of rock cutting are being developed using bit cutter-on-rock tribometry (BCORT). Tribo-testing is carried out on a slider pad-on-disk tribometer, retrofitted to include water-jet fabricated rock disks, a variable radius cutter assembly, and a system for the capture of in situ depth of cut. Preliminary findings for BCORT testing of O1 tool steel on Carthage marble are presented, in addition to verification of depth of cut measurements with a scanning white light optical interferometer. The interdependence of interfacial cutting friction, depth of cut rate, and disk speed are discussed in conjunction with experiments.

Optimization of Well Trajectory Under Uncertainty for Proactive Geosteering

SPE Journal ◽  
2014 ◽  
Vol 20 (02) ◽  
pp. 368-383 ◽  
Author(s):  
Yan Chen ◽  
Rolf J. Lorentzen ◽  
Erlend H. Vefring
Keyword(s):  
Kalman Filter ◽  
Robust Optimization ◽  
Ensemble Kalman Filter ◽  
Joint Estimation ◽  
Seismic Survey ◽  
Earth Model ◽  
Drilling Process ◽  
Water Contact ◽  
In Situ Data

Summary Various logging-while-drilling (LWD) and seismic-while-drilling (SWD) tools offer opportunities to obtain geological information near the bottomhole assembly during the drilling process. These real-time in-situ data provide relatively high-resolution information around and possibly ahead of the drilling path compared with the data from a surface seismic survey. The use of these in-situ data offers substantial potential for improved recovery through continuous optimization of the remaining well path while drilling. We show an automated workflow for proactive geosteering through continuous updating of the estimates of the Earth model and robust optimization of the remaining well path under uncertainty. A synthetic example is shown to illustrate the proposed workflow. The estimates of the depths of the reservoir surfaces and the depth of the oil/water contact and their associated uncertainty are obtained through the ensemble Kalman filter by use of directional-resistivity measurements. A robust optimization is used to compute the well position that minimizes the average cost function evaluated on the ensemble of geological models estimated from the ensemble Kalman filter (EnKF). The effect of modeling errors and the effect of joint estimation of the depths of the boundaries and gridblock resistivity are also investigated.

scholarly journals Aerobic degradation of oil-based mud drilling fluid by in situ bacteria in the Hawizeh Marshes

2021 ◽  
Author(s):  
Arash Rasti ◽  
Adel Ameri ◽  
Mohammad Ali Riahi
Keyword(s):  
Gas Chromatography ◽  
Crude Oil ◽  
Oil Pollution ◽  
Drilling Fluid ◽  
High Growth ◽  
Drilling Process ◽  
Biological Degradation ◽  
Chemical Additives ◽  
Degrading Bacteria

AbstractThe increasing global demand for hydrocarbon has brought new challenges in the petroleum reservoir's drilling process. Non-biodegradable chemical additives are used in drilling fluid and it leads to endangering the environment and personnel safety. Thus, there is a great need for new biodegradable drilling fluid additives that can protect the environment and personal safety while drilling is done well. This study with help of microbial analysis investigates the effects of in situ bacteria to degenerate the gasoline inside the oil-based mud, in the returned lubricant from one of the oil wells next to the Hawizeh Marshes. Four types of bacteria inside the oil-based mud were observed. According to the high growth and degradation of crude oil, one strain was selected. Determination of the coagulase and clumping test shows that the isolated strain belongs to staphylococcus. We investigate the performance of the staphylococcus bacterium on the lubricant from biological degradation aspects, using a gas chromatography technique. It was observed that the exposure of a small amount of the bacteria against 10 mL of lubricant indicates a considerable degree of degeneration, only in a few days. The residual crude oil in the culture medium was analyzed by gas chromatography (GC) and SARA. The results confirmed that the strain can degrade crude oil and produce lighter hydrocarbon. The saturate fraction increased about 23%, while the Resin and Asphaltene fractions decreased about 11% and 12%, respectively. This research is the first report on the characterization of crude oil-degrading bacteria from in situ bacteria at Hawizeh Marsh and by using this bacterium in the field the effect of oil pollution can be reduced on this marsh environment in a few days.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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