Tube wells, anatha sinhalu and deepwater horizon

[BlueMoonBoy]

සාමාන්ය නිවෙස් වලට ගෑලපෙන නල ලින් වරග ගෑනත් දාන්න මචන්.

මම අහල තියෙනව නල ලිදක් ගෑහුවම වටේට තියෙන ලින් වල වතුර අඩුවෙනව කියල, මේක ඈත්තක්ද?

 

[hancok]

සාමාන්ය නිවෙස් වලට ගෑලපෙන නල ලින් වරග ගෑනත් දාන්න මචන්.

මම අහල තියෙනව නල ලිදක් ගෑහුවම වටේට තියෙන ලින් වල වතුර අඩුවෙනව කියල, මේක ඈත්තක්ද?

main post eke me image eka laga kiyappu tika balanna machan

 

[dimuthmike]

Meka patta thread eka.aayeth kiyawanna ona himeeta.

 

[anuradhamapa]

16 hoda watina deyak machoooooooo +16

 

[THE_RAIN]

good post sinhalu

 

[Silly point]

TFS++

 

[hancok]

aa

 

[hancok]

scroll karala mouse eka gewna kiyapan

හම්මේ මාර වටිනව යකෝ.සෑහෙන්න දෙයක් දැනගත්ත.තෑන්ක්ස්+++

 

[DamN DoG]

good one tattayo
rep++

 

[thilina5312]

Ela machan
Good explain
Bump

 

[AlphaStigma]

මචන්උ බ නම් නියම පොරක්. පට්ට බන් එක හුස්මට කියවගෙන ගියා. බොහොම ස්තුති මේවගේ දෙයක් post කරපු ඒකට

 

[Tharutani San]

Ubata mara knowledge ekak thiye mcn TFS

 

[Identity]

 

[hancok]

 

[Alucard_SxE]

පොළවෙ bedrock එක හොයාගන්න(building construction purpose) හාරද්දි පාවිච්චි කරන්නෙනම් wash boring technique එක. ඒ කියන්නෙ drill bit එකෙන් පට්ට pressure එක්ක mud (bentonite mud slurry) විදින එක.( අර වගේම pressure maintanance එකත් වෙනව. පස් අස්සට bentonite slurry ගිහිල්ල මේ bentinite mineral එකේ property එකක් නිසා ඒ පස් පලාතම cement වගේ හයි වෙනව(temperory). high pressure එකටම ඉස්සරහ තියන පස් අංශු අයින් වෙලා හෑරෙනව. (ගෙදර හෝස් එක අරන් ටැප් එක කරකවල hose එකේ වතුර විදින කොණ පස් පොළවට තියල ටිකක් තද කරන් ඉඳපන් ගින්නක් නැතුව අඩි දෙක තුනක් හාරන්න පුළුවන් තප්පර ගාණක් ඇතුලත ගල් ඉන්නක් උදැල්ලක් අල්ලන්නෙවත් නැතුව.

මේ වගේ wash boring එකකින්නම් (drilling rigs) oil well එක හාරන්න කළින් rock layer කැඩෙන්නෙ නැතුව තියාගන්න පුළුවන් ඇති. deepwater horizon film එකෙත් kill line උයි අරවයි මේවයි ගොඩක් තිබ්බ තේරෙන්නෙත් නෑ සමහර ඒව. කොහොමත් උඹ කිව්ව වගේ ළං වෙද්දිම පොඩි ගල් තට්ටුවක් කැඩිල එනව ඇති ඒකනෙ film එකේ අර screens වලට ගල් එහෙම ආවෙ.

meka kiyewwe naththam kiyawanna machan

http://www.theoildrum.com/node/5757

"Sadly most catch fire and the rig is destroyed (there are more pictures of such damage at the EIP site). It's called a blow-out, and they still happen.

This is why we approach the oil/gas producing zone of the rock with caution. And bear in mind that the driller that is controlling the progress of this well is at the surface, trying to guide the bit at the bottom of the hole, with, historically, little immediate information to help.

Based on the surveys that brought the crew to the site in the first place he knows roughly how thick the layers of rock are, and probably what rock they are, but the only real information on where the bit is in that sequence, is from the returns (cuttings) that come out of the well, and there is the lag, we mentioned before, while those chips make their way up the 6,000 ft pipe. (This is why Measurement While Drilling [MWD] has been such a relatively recent boon to the industry (though not all rigs have it)).

By monitoring a number of pressure gages the driller can gain a sense of what is happening at the bottom of the well. If he senses that there is going to be a problem, then he can do one of several things, based on the way the well is set up.

The first thing is to increase the density of the mud. By making the fluid in the well weigh more, the difference in the pressure across that face is reduced, and the change in conditions is easier to handle. However weighting up the hole has the disadvantage that it becomes much slower to drill with a heavier mud (it is a poor bottom-hole cleaner among other things). And, if done during drilling, bear in mind that once the heavier mud is added to the well it won't be fully effective until it has had time to get down to the bit and then fill back up the annulus between the drill string and the casing all the way to the surface.

So that is an expensive and slow option. Let us take the game a little more interesting and say that there is a gas pocket above the oil, and that the hole is going to go into the layer at A. Gas will enter the well at the down-hole pressure, but as the bubble rises, that pressure is reduced, and the gas expands, pushing the mud above it out ahead of itself. Another potential source for big-time trouble. And this one (which is known as a kick in the well) happens much faster, so there is less time to react.

How do we handle this? The answer is to invert the problem. Gas or oil flows into the well because the well is at a lower pressure than the fluid in the rock. The fluid in the well is, initially at the pressure created by the depth, and by the weight (density) of the mud in the hole. However, if we put a restriction on the flow of fluid out of the well (such as when you put your finger over the end of a garden hose so that the stream becomes smaller and shoots out further) we can increase the pressure in the well.

For those who want to know why, if the same volume has to go through a smaller hole in the same amount of time it has to go faster. This means it has to be pushed harder. Bernoulli explained it, and there is an animation available that helps explain it."

And meka patta A bit old though

Patta thesis tikak e video eke thiyanawa

Thanks for pointing out something interesting machan. Did learn much in an interesting subject. Will checkout further details.

 

[hancok]

meka kiyewwe naththam kiyawanna machan

http://www.theoildrum.com/node/5757

"Sadly most catch fire and the rig is destroyed (there are more pictures of such damage at the EIP site). It's called a blow-out, and they still happen.

This is why we approach the oil/gas producing zone of the rock with caution. And bear in mind that the driller that is controlling the progress of this well is at the surface, trying to guide the bit at the bottom of the hole, with, historically, little immediate information to help.

Based on the surveys that brought the crew to the site in the first place he knows roughly how thick the layers of rock are, and probably what rock they are, but the only real information on where the bit is in that sequence, is from the returns (cuttings) that come out of the well, and there is the lag, we mentioned before, while those chips make their way up the 6,000 ft pipe. (This is why Measurement While Drilling [MWD] has been such a relatively recent boon to the industry (though not all rigs have it)).

By monitoring a number of pressure gages the driller can gain a sense of what is happening at the bottom of the well. If he senses that there is going to be a problem, then he can do one of several things, based on the way the well is set up.

The first thing is to increase the density of the mud. By making the fluid in the well weigh more, the difference in the pressure across that face is reduced, and the change in conditions is easier to handle. However weighting up the hole has the disadvantage that it becomes much slower to drill with a heavier mud (it is a poor bottom-hole cleaner among other things). And, if done during drilling, bear in mind that once the heavier mud is added to the well it won't be fully effective until it has had time to get down to the bit and then fill back up the annulus between the drill string and the casing all the way to the surface.

So that is an expensive and slow option. Let us take the game a little more interesting and say that there is a gas pocket above the oil, and that the hole is going to go into the layer at A. Gas will enter the well at the down-hole pressure, but as the bubble rises, that pressure is reduced, and the gas expands, pushing the mud above it out ahead of itself. Another potential source for big-time trouble. And this one (which is known as a kick in the well) happens much faster, so there is less time to react.

How do we handle this? The answer is to invert the problem. Gas or oil flows into the well because the well is at a lower pressure than the fluid in the rock. The fluid in the well is, initially at the pressure created by the depth, and by the weight (density) of the mud in the hole. However, if we put a restriction on the flow of fluid out of the well (such as when you put your finger over the end of a garden hose so that the stream becomes smaller and shoots out further) we can increase the pressure in the well.

For those who want to know why, if the same volume has to go through a smaller hole in the same amount of time it has to go faster. This means it has to be pushed harder. Bernoulli explained it, and there is an animation available that helps explain it."

And meka patta A bit old though

Patta thesis tikak e video eke thiyanawa

Thanks for pointing out something interesting machan. Did learn much in an interesting subject. Will checkout further details.

patta video eka machan balanawa . thanks for the info

 

[hancok]

buno

 

[justinshady]

good thread ++++

 

[මරුසිරා]

හැන්කොක් මලය සෑහෙන්න වැදගත් විස්තර ටිකක් .

බොහොම ස්තුති නොදන්නා දෙයක් කියල දුන්නට

රේප් +11

 

[hancok]

හැන්කොක් මලය සෑහෙන්න වැදගත් විස්තර ටිකක් .

බොහොම ස්තුති නොදන්නා දෙයක් කියල දුන්නට

රේප් +11