Yearly Archives: 2011

Good website about petroleum engineering schools

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Today, I have one site that I would like to recommend for you guys who would like to study in oil and gas as petroleum engineers. There are may areas that you can study as drilling, completion, production, reservoir, economics, etc.   This website provides you details of petroleum engineering universities over the world. You will know which schools that match for you and you can contact the school right away because there are contact information on each school.

Click the link below to see all details.


Petroleum Engineering Information

 

If you think this website is advantageous for you or your junior personnel, please feel free to let them know as well.

 

Determine surge and swab pressure for open-ended pipe

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You’ve learn how to determine surge and swab pressure from the previous topic (Surge and swab pressure method 1) and this topic will demonstrate you how to use those equations to determine surge and swab pressure for the open-ended pipe.

 

Example

 

The well information is listed below:

θ300 = 85

θ600 = 130

Hole diameter = 9 inch

Drill Collar = 6.25 inch

ID of drill collar = 2.5 inch

Drillpipe diameter = 5 inch

ID of drill pipe = 3.5 inch

Average pipe running or pulling speed = 250 ft/min

Drill Pipe Length = 12000 ft

Drill Collar Length = 800 ft

Current Mud Weight = 12.5 ppg

Well TVD = 9000 ft

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Surge and Swab Calculation Method 1

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This is the first method to determine surge and swab pressure.

Learn more about Surge Pressure and Swab Pressure

Surge is additional pressure due to pipe movement downward and swab is reduction of pressure due to upward movement of drill string.

Bottom hole pressure is reduced due to swabbing effect.

Bottom hole pressure is increased due to surging effect.

 

 

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How To Translate Articles in Drillingformulas.com Into Other Languages

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Someone might not know about how to translate all articles in driling formulas.com into any languages.

Please following the simple guideline.

1. At the side bar, there is one box called translation containing many flags.

2. Click at the language that you want the program to translate for you. For this example, I click the Germany flag to translate all articles into German.

3.  You will see that drillingformulas.com is translated into German.

The translation is done by google translation which is the best translator program. It will help you understand more about the content in the website. However, since it is an oilfield articles, the translation program may not 100% accurate. Anyway, I am sure that it will help you out.

Why Slug Does Not Work?

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Slug is typically used to push mud in the drill string down therefore pipe will dry while pulling out of hole. Dry pipe while pulling out has some advantages as minimizing crew to expose to drilling mud when breaking a connection, reducing time to handle the drill string, etc. Sometimes, even you already pump slug but you still have wet pipe instead of dry pipe. You may wonder why the slug does not work very well.

The following reasons why the slug does not do its job are as follows:

 

• Slug volume is not enough to slug the pipe. Recommended volume is around 25- 40 bbl.

• You should chase slug by pumping mud at least surface volume from mud pump to a rotary table. Otherwise, you will not get desired slug volume in the drillstring because it is still left in the surface volume.

• Weight of slug is not sufficient. As a normal practice, the slug weight should have at least 2 ppg over your current mud weight.

• There is something inside the drill string so the slug could not push mud in the drill string down.

 

If you want to learn more about slug, please read the following articles:

What is slug mud? How much volume and weight of slug mud should be?

Barrels of slug required for desired length of dry pipe