Deep Water The Gulf Oil Disaster And The Future Of Offshore Drilling – Report to the President (Macondo Well – Deepwater Horizon)

by DrillingFormulas.Com on January 25, 2012

Today, I would like to share the great resport of the deepwater horizon – Macondo well published by the US Government. You can download the report for FREE. 

Click Here to download the report => http://www.gpo.gov/fdsys/pkg/GPO-OILCOMMISSION/pdf/GPO-OILCOMMISSION.pdf

On April 20, 2010, the Macondo well blew out, costing the lives of 11 men and beginning a catastrophe that sank the Deepwater Horizon drilling rig and spilled nearly 5 million barrels of crude oil into the Gulf of Mexico. The spill disrupted an entire region’s economy, damaged fisheries and critical habitats, and brought vividly to light the risks of deepwater drilling for oil and gas — the latest frontier in the national energy supply. Soon after, President Barack Obama appointed a seven-member Commission to investigate the disaster, analyze its causes and effects, and recommend the actions necessary to minimize such risks in the future. The Commission’s report offers the American public and policymakers alike the fullest account available of what happened in the Gulf and why, and proposes actions — changes in company behavior, reform of Government oversight, and investments in research and technology — required as industry moves forward to meet the nation’s energy needs.

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How To Determine Hole Size By Fluid Caliper

by DrillingFormulas.Com on January 24, 2012

This article will demonstrate you how to determine hole size by fluid caliper. First of all, you need to know what is the fluid caliper is. The fluid caliper is one simple way to calculate hole diameter. The concept is based on hole volume, annular capacity, and inner capacity. You pump any substance and when you seen it on surface, you back calculate the hole size based on strokes pumped. It is quite tricky to explain so I would like you to see the example below which it will make you clear about what I say.

 

7” casing shoe is set at 5000’MD/4500’TVD

7” casing 23 ppf, ID 6.33 inch

4” drill pipe is used to drill the well and its ID is 3.34 inch.

4-3/4” drill collar is used as BHA and its ID is 2.5 inch. The length of drill collar is 500 ft.

This hole section is used water based mud and the bit size is 6-1/8”

Drill to section TD at 10,000’MD/9,000’TVD then drop carbide once TD is reached.

Pump output is 0.1 bbl/stroke.

Surface line from pumps to rig floor is 20 bbl.

Carbide is detected by a gas sensor on surface after 4,000 strokes pump.

With the given information, determine what is the hole size of the open hole section.

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Drilling Fluids, Mud Pumps, and Conditioning Equipment Book Review

by DrillingFormulas.Com on January 19, 2012

Learning about drilling fluids, mud pumps and conditioning equipment is required basic knowledge which personnel working on the rig must understand. In the old day, you may need to take a lot of time to learn this knowledge. Nowadays, Petroleum Extension Service publishes the book named “Drilling Fluids, Mud Pumps, and Conditioning Equipment” which will provide learners a lot of essential thing regarding drilling fluids, mud pumps and equipment. Today, I would like to review this book so you will know what inside and what you will you get from it.

What will you learn from this book?

These are brief contents which you will learn from the book.

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Coefficient For ID of Pipe and Tool Joints

by DrillingFormulas.Com on January 16, 2012

You’ve learned about pressure loss in the drill string from the previous topic (Pressure Losses through Drill String Calculation). The general coefficient for internal diameter of pipe does not account the inside diameter of tool joint.

The general coefficient equation is shown below:

Coefficient of The Bore of Drill Pipe and Tool Joint

To get the accurate pressure loss calculation, the coefficient of a section of pipe must be accounted for both the pipe ID and the tool joint ID.

In general, each 100 ft of pipe, there is appoximately 6.7 ft of tool joint length (6.7% of total length) and 93.3 ft of drill pipe (93.3% of total length). Therefore, the general coefficient for internal diameter of pipe can be derived in to this following equation:

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Pressure Losses Through Drill String Calculation

by DrillingFormulas.Com on January 13, 2012

This articles demonstrates how to determine pressure losses through drill string.

To determine pressure drop while the drilling mud is passing through a circular pipe (drill pipe and drill collar), you can calculate pressure loss with the following equation:

Assumptions:

Turbulent viscosity = 3 cp

Friction factor = 0.378(Q/D)-0.14

The first equation has a coefficient (C) to take into account the friction and the geometry of the bore ID.

Where:

P = pressure loss, psi

L = length of pipe, ft

W = mud density, ppg

Vf = viscosity correction factor

PV = plastic viscosity, centipoises

Q = flow rate, gpm

Di = inside diameter of pipe, inch

C = general coefficient for internal diameter of pipe

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Five Useful Website To Find The Oil and Gas Jobs

by DrillingFormulas.Com on January 10, 2012

Finding the drilling job worldwide is not a tough job anymore because we have the internet that you can use to search the positions in oil and gas industry. Today, I would like to recommend you five online websites that you should take a look if you want to get the oil and gas jobs. Moreover you can see how much the oil and gas exploration grow over time. Let’s get started.

http://rigzone.com/

Rigzone is “Your Gateway to the Oil and Gas Industry” providing you with industry news and information, careers, company directory, offshore rig data, equipment marketplace, and more.

Rigzone provides its visitors and membership with an unequaled source of information – a true industry gateway full of dynamic, original content and resources that cannot be found anywhere else. Some of the key sections and services of Rigzone include:

Industry News and Analysis – news coverage of the latest news and events in the oil & gas industry

Career Center – a vibrant community of job seekers and employers in the oil and gas industry

Company Directory – the industry’s most complete listing of online oil and gas industry companies and related services

Offshore Rig Data Services – continually updated status and location information on the world’s offshore drilling fleet

Equipment Marketplace – online forum for buying and selling new and used oilfield equipment

Newsletter Subscriptions – daily, weekly, and monthly updates to your inbox full of news and commentary, rig information, and more

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Drilling Hydraulics Optimization for the System with Downhole Tools

by DrillingFormulas.Com on January 9, 2012

BHA - Ref. Spe.org

The system with downhole tools means the drill string consisting of drill pipe, drill collar, down hole equipment (MWD, PWD, LWD) and a bit. The process of optimization this system is more complicated than the simple system. Due to the fact that the down hole equipment responses differently when changing in flow rate, even the similar tool, the pressure responses cannot be modeled with simple equation.

There are two methods used to optimize drilling hydraulics with downhole tools.

1. The first method is to subtract the expected pressure loss generated by downhole tools from the surface pressure. After you get the reduced surface pressure, you optimize the system with lower pump pressure.

2. The second method is to optimize whole system as if there is no downhole equipment and then you subtract the expected pressure loss by downhole tools from available bit pressure.

What are the differences between both methods of optimization with downhole tools?

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Tectonic Stress Causes Stuck Pipe

by DrillingFormulas.Com on January 8, 2012

Tectonic stress is a nature phenomenal and it naturally occurs due to lateral force from the formation. Typically, if the rig is close to mountains, there is high chance to face with the tectonic stress issue. 

The later force will create stress which will squeeze sandstone causing under gauge hole. Moreover, the lateral stress will fracture shale and create additional cuttings. 

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Optimize Drilling Hydraulics for the Basic System

by DrillingFormulas.Com on January 4, 2012

The basic system means the drill string consisting of drill pipe, drill collar and a bit (no downhole tools). The process for drilling hydraulic optimization is simple. The following steps demonstrate how to optimize drilling hydraulics for the basic system.

• Select drill pipe and drill collar which provide pressure loss at a minimum for the range of depth and flow rate.

• Decide the methods to optimize drilling hydraulics. If you drill a shallow hole section, the maximum impact force is recommended. However, if you drill a deeper section, the maximum hydraulic horsepower is better than the maximum impact force.

• Determine flow rate to meet your optimization requirement at the end of the bit run. The curve below gives you a idea how you can get the flow rate from the char at each particular optimization method. 

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Drillingformulas.com last post of this year 2011

by DrillingFormulas.Com on December 31, 2011

This is my last post of this year 2011. First of all, we would like to thank you everyone who read this blog and we enjoy sharing oilfield knowledge very much. During this year 2011, we posted several articles in many aspects of drilling as drilling formulas, well control, drilling operation, oilfield book review, etc. However, we still have a problem with our web hosting from time to time and we just order a new virtual private sever. Hopefully, the technical problem like this will not be happened in the future.

As you might not know, we have three websites regarding oilfield.

Drilling Formulas - http://www.drillingformulas.com

Drilling Mud - http://www.drilling-mud.org/

Petroleum Engineering Information - http://www.petroleum-engineering.net/

What will we do for the next year 2012?

We have been discussing about our goal for next year and this is what will be happening.

• Well control articles – well control equipment (BOP), complication, well control technique (lubricate and bleed, volumetric, etc)

• Drilling hydraulics articles

• Additional drilling formulas and sample calculations

• Application of drilling formulas spread sheet – we will show the example on how to use the drilling formulas spread sheet into real drilling operation.

• Oil field dictionary – we are working on it now and we should have this website done in few weeks. This part we need your input to help grow the oil field wording too because only our team may not be able to collect all the meaning.

• Free oil field dictionary program

• Free stuck pipe e-book

• Free petroleum engineering schools hand book

• Drilling waste management

• Drilling operation useful tips

• Useful oilfield spread sheet

• Oilfield book review

• Additional petroleum engineering schools

Please feel free to give us feedback or suggestions in any aspects so we can use it to improve our website.

Wish you have good heath, wealthy and all best with you. See you next year 2012.

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