Author Archives: DrillingFormulas.Com

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Working in the oil field and loving to share knowledge.

Determine surge and swab pressure for close-ended pipe

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I would like to show more calculation about surge and swab pressure. In this article, I will show how to use the previous formulas (Surge and swab pressure method 1) to figure out surge and swab pressure for close-ended pipe (plug flow). The calculation concept is pretty much the same but I would like to show you how much difference between surge/swab if you have the close-ended pipe.

 

I still use the same data but this time so I can compare apple to apple with the previous calculation.

 

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

Continue reading →

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

Continue reading →

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.

 

 

Continue reading →

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.