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rafi1228 · 6 years ago

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Learn to master Laravel to make advanced applications like the real CMS app we build on this course

What you’ll learn

Learn to build applications using laravel

To install Laravel using Windows and MAC

You will learn how use Laravel

You will learn how to use routes

You will learn how to create and use Controllers and what they are

You will learn how to create Views an what they are

You will learn to use the templating engine Blade

How to connect and use Databases

How to create migrations and what they are

You will learn about Laravel ORM (Object Relational Mapper) and Raw SQL queries. Database stuff 🙂

How to use Laravel Tinker – Command line program to play around with Laravel without persisting data

Database: Eloquent One to One – CRUD

Database: Eloquent One to Many – CRUD

Database: Eloquent Many to Many – CRUD

Database: Eloquent Polymorphic – CRUD

Form Validation

You will learn to download third party libraries to add to Laravel

You will learn to upload files

You will learn about Middleware and security

You will learn about sesssions

You will learn about sending emails

You will learn Github or version control

You will learn how to install a WYSIWYG editor

To install a commenting system / Disqus

You will learn to create a BULK functionality that you can use the CRUD on it

You will learn to deploy Laravel on share hosting accounts, like godaddy

And lots of more cool things

Requirements

Basic OOP PHP

Description

VERSION 5.2 but we keep updating as new version come out. This is an evergreen course because we keep adding new fresh content all the time!

UPDATES …….

5.3 – section 33

5.4 – section 38

5.5 – section 40

5.6 – section 41

5.7 – section 43

5.8 – section 43

We will keep updating the project as new versions come out!

Over 23,000 students in this course and over 380,000 students here at Udemy.

Best Rated, Best Selling, Biggest and just baddest course on Laravel around 🙂

Oh it’s also the best course for complete beginners and of course regular beginners 🙂

Laravel has become on of the most popular if not the most popular PHP framework. Employers are asking for this skill for all web programming jobs and in this course we have put together all of them, to give you the best chance of landing that job; or taking it to the next level.

Why is Laravel so popular? Because once you learn it, creating complex applications are easy to do, because thousands of other people have created code we can plug (packages) in to our Laravel application to make it even better.

There are many reasons why Laravel is on the top when it comes to php frameworks but we are not here to talk about that, right?

You are here because you want to learn Laravel, and find out what course to take, right? Alright lets lists what this course has to offer, so that you can make your decision?

Benefits of taking this course (I promise to be brief)

1. Top PHP instructor (with other successful PHP courses with great reviews)

2. Top support groups

3. An amazing project that we will be building and taking to Github

4. Lots of cybernetic coffee to keep you awake…..

5. Did I mention I was not boring and you will not fall asleep?

Ok, Let’s break each of these down, shall we?

Top Instructor…..

I don’t like boasting but my other PHP courses can speak for me 🙂

Top support groups

I make sure everybody helps in the class and we also have Facebook support groups if needed.

The Amazing project / real life application….

On this project you will learn everything you need for creating awesome applications the easy way with Laravel, and new features will be implemented all the time, just the the curriculum and look at the updates section.

Full Source Code is Available at Github

Oh yeah, we take this to Github (A app repository online) and even show you how, so you will learn that too.

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Practicality…………………..

Lots practical skill with some theory so you get more experience that its essential for becoming a Professional Laravel Developer.

This course will take your game a new level. Imagine being able to create the next Facebook or twitter, or even getting the developer job you dream of? What about just a programming job? You can achieve all that if you study with us and really focus. We will help you along the way.

Here are some my lovely students (Not to show off of course) 🙂

REVIEWS ——————————->

Rating: 5.0 out of 5

*****

Understood MVC in one sentence after so many years! Great job Edwin. A great deal of effort has been put by Edwin to create the content in two parts , first for understanding the basic components (eloquent relationships, views, controller etc) and then actually using it in a project. And he loves teaching. We love learning from him!

———————————————————

Rating: 5.0 out of 5

Great Course! Everything was explained well and if you will have any questions they will give you good answers, or you will find the answers in Q&A.

———————————————————

Rating: 5.0 out of 5

I would recommend this course to Laravel beginners like me, it covers a lot and the idea of learning on short-manageable videos + learning from errors that follow is a home run best approach! I am satisfied with course and especially with teacher Edwin who is extreme motivator…….

Rating: 5.0 out of 5

I loved the course!! Learned a lot and actually applied it, I’m very happy. 10-stars!!!

———————————————————

Get it? Not every course its perfect we do get the best reviews for a good reason, of course you can’t please everybody but we try.

Are you ready to to create the next Facebook or Twitter? …………….

Lets start with the fundamentals

Downloading Laravel

Installing it with composer

Lets also use Laravel Homestead

We learn about Routes, Controllers, views, models, migrations, template engines, middleware and more

Lets learn the CRUD, create, read, update and deleting data 🙂

Wait, lets also learn the CRUD with all the ELOQUENT relationships,

Lets learn so database stuff 🙂

One To One

One To Many

One To Many (Inverse)

Many To Many

Has Many Through

Polymorphic Relations

Many To Many Polymorphic Relations

Querying Relations

Relationship Methods Vs. Dynamic Properties

Querying Relationship Existence

Querying Relationship Absence

Counting Related Models

Inserting & Updating Related Models

The save Method

The create Method

Belongs To Relationships

Many To Many Relationships

Let me break down some things from the projects but not all, cause my hands are a little tired 🙂

Authentication system

Multi users with roles, Admins, subscribers and whatever you want 🙂

User profiles

Uploading photos, multi pictures

Multiple input selections

User, CRUD

Pos CRUD

Category CRUD

Photo CRUD

Pretty URL’s

Commenting system, reply system with tree

Disqus commenting system

Sessions, and flash messages

Email Sending

EMAIL testing

Restrictions

Deployment

Lots more, too many to list

Oh did I mention we keep updating the course with new versions?

Did I also mention this LARAVEL course is the best rated course, the best selling and the biggest of its kind here in Udemy?

Lets start this and let’s create big things 🙂

Who this course is for:

People looking for web programming jobs should take this course

People looking to learn everything about laravel should take this course

Students who want to take their PHP skills to another level should take this course

Created by Edwin Diaz, Coding Faculty Solutions Last updated 3/2019 English English

Size: 9.60 GB

Download Now

https://ift.tt/1sLScUT.

The post PHP with Laravel for beginners – Become a Master in Laravel appeared first on Free Course Lab.

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alexandersmcdaniels · 7 years ago

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What are Positive Displacement Mud Motors in Drilling for Oil and Gas?

Positive-Displacement Motors (PDM) make use of a power generation section which is made up of a rotor/stator combination. In order to move a rotor part, a PDM requires hydraulic power from drilling fluid flowing through the power generation part. With a PDM, the stator and rotor work in tandem in the same way that gears do. The stator acts as the outer gear, and is made from a moulded elastomer featuring at least two lobes. The OD of the elastomer is protected by a secure metal casing. The rotor is positioned within the stator, and acts as an internal gear. This rotor is made of metal, and will have one less gear or lobe than the stator. Because of this difference, a cavity is created which is filled with drilling fluid when the PDM is downhole. This cavity acts as a wedge when it is put under pressure, and because the drilling fluid itself can’t be compressed, the force applied to the top of the wedge causes the rotor to move.

Figure 1 – Mud Motor

Given the helical shape of the rotor, such an application of force causes the rotor to rotate. As with a turbine, this rotation is then transmitted to the drive shaft and from there on to the drill bit. A seal around the cavity is produced as a result of contact between the OD of the rotor and the ID of the stator, as seen in Figure 2. This means that torque is applied to the rotor in order to overcome the resistance caused by the bit/formation interface and contact resistance between internal motor components.

Figure 2 – Mud motor rotation (Wikipedia, 2018)

In a turbine, torque and bit speed are dependent on each other; this is not so within a PDM. However, an exception to this rule is where the rotor is “nozzled” (when a bore through the rotor is used to divert a portion of the drilling fluid). As per the theory , torque is proportional to differential pressure (which increases at the surface as WOB increases), as bit speed is also proportional to the flow rate. The torque is proportional to the cube diameter of the motor, and the speed is inversely proportional to this same factor. Therefore, power is proportional to the square of the motor diameter. A function of the stator/rotor sliding speed during rotation is the speed limitation of the PDM. This is also affected by the drilling fluid velocity through the cavities.

The rotor/stator configuration is what controls the torque/bit speed relationship as seen in Figure 3 . When the number of rotor/stator lobes increases from the single lobe arrangement of conventional motors to multiple lobes, the bit speed will decrease, while the torque production will increase. This allows for the optimization of torque and bit speed, which is needed for roller-cone bits and drag-type PDC bits. Normal PDMs cannot meet these output necessities.

Figure 3 – Mud Motor Configuration, RPM, Torque Relationship (directionaldrillingart.blogspot.com, 2017)

Components of PDM

This information below explains main components of PDM.

Dump Valve

The by-pass valve, or dump valve, is shown in Figure 4 below. It is used to allow drilling fluid to fill the drillstring from the annulus when it is tripping into the wellbore, or to drain it when it is tripping out. Thanks to this valve, the bottom of the wellbore maintains a constant pressure, which helps to prevent control problems during trips.

Figure 4 – Dump Valve(directionaldrillingart.blogspot.com, 2017)

Power Section

In the power section (Figure 5), the spiral shaped rotor produces rotation when the drilling fluid force acts upon it. Should the bit/formation resistance to rotation (known as the drilling torque requirement) be too great, then the drilling fluid can potentially cause the elastomeric material of the stator to become deformed temporarily. The division or seal between high and low pressure is then lost, which causes the motor to stall. As the pressure inside each cavity decreases from leakage of fluid volume past the lost seal, there will be a significant pressure increase at the surface. This means that the motor needs to be lifted off the bottom, and then restarted. Should the stall not be properly corrected, the stator will be permanently damaged, and the life of the overall motor reduced. This is especially important when working with higher flow rates or high differential pressures. Less applied differential pressure will mean fewer stalls.

Figure 5 – Power Section (Dyna-Drill.com, 2018)

The center axis of stator and rotor are not identical. The offset between these two center points is known as “eccentricity”. When the rotor turns within the stator, its axis moves around that of the stator. One full rotation around this stator access is called a nutation or precession. To find a PDM’s precessional speed, one must multiply the rotational speed by the number of rotor lobes. This process is, in effect, a gear reduction mechanism, and accounts for why the bit speed will decrease when the rotor/stator lobe configuration is increased.

The stator itself is formed out of a steel tube, lined with elastomer, and with spiraled lobes which correspond to the rotor. The material needs to be rigid enough to withstand abrasion and wear from the solids in the drilling fluid, but also flexible enough to provide enough of a seal on the rotor. It is therefore necessary to find some midpoint between these two demands. The materially also needs to be minimally affected by the numerous chemicals in the drilling fluid, as well as normal operating temperatures. It is vital that the elastomer bonds properly to the steel casing. It needs to be completely clean, to allow for effective adhesion.

After this is done, the elastomeric material needs to be pumped into its proper place, to prevent air pockets developing between the elastomer and its casing, as well as within the elastomer itself. Finally, an intricate curing process needs to take place. Although this is considered proprietary, it is nonetheless similar to the procedures used to heat-treat various metals.

Power Curves

PDM Power Curves are an extremely useful source of specific data when required drilling parameters are known. There are four major parameters displayed on the Power Curve format used here:

Output Torque (foot-pounds)

Output Rotational Speed (revolutions per minute)

Total Pressure Drop (pounds per square inch)

Drilling Fluid Flow Rate (gallons per minute)

Figure 5 – Power Cure of Mud Motor (Halliburton, 2018)

These graphs refer specifically to a stated design (i.e. a rotor/stator configuration), and one where water is used as the fluid medium. Should a fluid of a higher density or viscosity be used, the torque and pressure drop will subsequently be higher. Using weighted fluid will have an impact on the parasitic (free-running) pressure losses which are a part of the total pressure drop. Said parasitic pressure losses are in part a result of contact between the particles of barite which is used to raise the density of the fluid. When the drilling fluid weight goes up, so too does the amount of solid particles and thereby the particle-to-particle contact.

In addition, if a fluid is used which is more viscos than water, the torque output will be larger than the one indicated by a water-based curve. This is because thicker fluids result in a better seal between rotor and stator, maximizing the differential pressure that may be applied. Given the direct relationship between torque production and applied differential pressure, higher differential pressure across the PBM means there will be greater torque production than that shown on the Power Curve, as the seal is improved.

Transmission Assembly

The Transmission Assembly takes care of the eccentric rotation, or precession, of the rotor, which needs to be stabilized within the stator when the mechanical energy reaches the bit. On top of this purpose, the transmission assembly will also absorb some of the hydraulic thrust which originates in the power section, and transmit the generated torque to the drive or output shaft. There are multiple designs used in the drilling industry to achieve this purpose.

Figure 6 – Transmission Assembly (http://steelmakingmachine.com, 2017)

Bearing Assembly

Bearing assembly which consists of radial and axial thrust bearing supports a transmission assembly. The bearing assembly transmits rotational force from the the transmission assembly and support both trust load and radial bending load while drilling.

Figure 7 – Bearing Assembly

There are two types of bearing assembly.

Oil Sealed Bearing Assembly – This type is recommended to use when corrosive drilling fluid is utilized, there is a lot of LCM to be pumped through the BHA or it is required to have very low pressure drop across the bit.

Mud Lubricated Bearing Assembly – This type use some of mud flowing through the bearing assembly. Typically, it is about 4 – 10% of mud which is used to lubricate and cool the shaft and bearings.

Adjustable Bend Housing

An adjustable bend housing (figure 8) connects a bearing assembly to a stator and it also provides protection to a transmission assembly. The bending on a mud motor can be adjusted in order to achieve a required build rates while sliding. If the angle is set at 0 degree bend, it is normally used to improve drilling performance in a vertical well since a bit will spin faster than a rotary drilling.

Figure 8 – Adjustable Bend Housing (http://drillingknowledge.blogspot.com, 2018)

References

Inglis, T.A. (2010) Directional drilling. Dordrecht: Springer-Verlag New York.

Mitchell, R.F., Miska, S.Z. and Aadnoy, B.S. (2012) Fundamentals of drilling engineering. Richardson, TX: Society of Petroleum Engineers.

Short, J.J.A. (1993) Introduction to directional and horizontal drilling. Tulsa, OK: PennWell Books.

Technical, T., Astier, B., Baron, G., Boe, J.-C., Peuvedic, J.L.P. and French Oil & Gas Industry Association (1990) Directional drilling and deviation control technology. Paris: Editions

En.wikipedia.org. (2018). Mud motor. [online] Available at: https://en.wikipedia.org/wiki/Mud_motor [Accessed 28 Apr. 2018].

Directionaldrillingart.blogspot.com. (2018). SDMM – An Introduction. [online] Available at: https://directionaldrillingart.blogspot.com/2015/10/sdmm-introduction.html [Accessed 28 Apr. 2018].

Dyna-drill.com. (2018). dyna-drill.com. [online] Available at: https://www.dyna-drill.com/power-sections [Accessed 28 Apr. 2018].

Halliburton.com. (2018). SperryDrill® and SperryDrill® XL/XLS Positive Displacement Motors – Halliburton. [online] Available at: http://www.halliburton.com/en-US/ps/sperry/drilling/directional-drilling/matched-systems/sperrydrill-and-sperrydrill-xl/sperrydrill-and-sperrydrill-xl-xls-positive-displacement-motors.page [Accessed 28 Apr. 2018].

Steelmakingmachine.com. (2018). Downhole Drilling Motor,Downhole Tools,Energy Conversion Device Manufacturer. [online] Available at: http://steelmakingmachine.com/6-1-downhole-drilling-motor.html [Accessed 28 Apr. 2018].

Drilling, S. and man, h. (2018). Steerable Downhole Mud Motor – Directional Drilling. [online] Drillingknowledge.blogspot.com. Available at: http://drillingknowledge.blogspot.com/2017/11/steerable-downhole-mud-motor.html [Accessed 29 Apr. 2018].

from Oil And Gas Updates http://www.drillingformulas.com/what-are-positive-displacement-mud-motors-in-drilling-for-oil-and-gas/

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