why is there a change in temperature of drilling mud as you approached overpressured zones while drilling?
354143
increased pressure = increased heat
677782
It's the change in air pressure which causes it.
432932
For it to create artesian conditions it would have to be something that has very low, or no, permeability.  In my experience this is usually unfractured limestone, mudstone, or shale.
977702
It is just like going to the bottom of a swimming pool.  The deeper you go, the more weight of water is above you.  The atmosphere also behaves as a fluid, but it is a gas.  With gases, the greater the pressure, the closer the gas molecules are to each other which means the gas has more mass per unit volume at sea level than it does at higher elevations.  Temperature in gas is due to the energy of the collisions of the gas molecules with each other.  The greater the number of collisions, the higher the energy (heat).  When gas expands the thermal energy is distributed over a larger volume which relates to a decrease in temperature.  Compressing the gas (example: a cylinder and piston) will concentrate the energy in a smaller space, elevating the temperature.  Which is why diesel engines do not require spark plugs.
58327
Pressure goes up as temperature goes up.
170935
Site Survey, Drilling/boring for oil well, pumping out petroleum, transporting the crude petroleum to Oil Refinery, Processing of Petroleum Oil at 400 degree Celcius and collecting of various petroleu oils ans bio-products like wax, bitumen, hydrocarbon, etc. at their boiling temperature.
930130
I will look at it from a different angle.\nConsider the equation of state,\nPV=MRT\nExpansion through a nozzle causes the\npressure to drop and volume to increase \nbut not as compared to drop in pressre. \nThe net effect is that product PV reduces.\nM the mass is not changing. R is the gas \nconstant. So T[temp in absolute] has to drop.
1087373
In trying to protect a gas processing facility from over pressure you much look at the design pressure of the high pressure portion of the plant and that of the incoming pipeline. Many times these are not consistent. \n\nIf you have a 1200 psi designed pipeline feeding into a 1000 psi designed plant then you would have to consider the possibility that the plant might be isolated by valving at a time when the pipeline is at maximum pressure and someone opens the inlet valve. In that case the inflow rate once the plant pressure exceeds 1000 psi might be greater that the 40MMSCMD. \n\nIn the reverse case where the plant design pressure is greater than or equal to the pipeline design pressure, the inflow rate is not a controlling case for over pressure protection.\n\nOne must look at each change in pressure level to determine all the circumstances that can cause an over pressure no matter now remote the likely hood. The odds of a particular event occurring is not a consideration in ranking the various cases.
149158
There are three stages to oil formation. The first is called diagenesis. This stage involves the biological, chemical, and physical alteration of organic material before heating begins to affect it. \n\nThe second state is the thermal alteration you are referring to, known as catagenesis. This stage generally takes place between 50-200 degrees C (122-392 F). \n\nThe third stage is called metagenesis, and is high temperature alteration. It is also known as the gas window. It ranges above 200 degrees C. \n\nThe temperature required to alter organic material is produced by gradual burial and the geothermal gradient for the area of burial. As heat comes from the earth's mantle it warms the crust. Areas with thin crust have high heat gradients, while areas with thick crustal material have a slower geothermal gradient. \n\nThe oil window is often referred to as the period of time during which it is believed that a source rock was buried deep enough to cause catagenesis. The burial history is studied using several methods (including vitrinite reflectance values and bottom-hole temperature measurements) and this gives petroleum geologists some idea when oil might have formed in a particular basin. Combining this with understanding of what structural or stratigraphic changes have taken place, a prediction is made of where the oil might have migrated to, away from its source rock.\n\nBy the way, since this might very well be the only answer you get to this question, I would appreciate it if you would close it out when you are satisfied that no one else is going to answer. Thanks.\n\nReference: Hunt, John M. , 1996, Petroleum Geochemistry and Geology, WH Freeman & Co: New York, 743 pp.   (probably the best reference book on the topic)
3355
the earth, in the interior, is very much hot. This heat energy starts to boil the groundwater near it and produces steam.this steam is the geothermal power.
817813
on a drilling rig. at work. bleah.
168959
It would be impossible to drill down far enough to cause that sort of catastrophe due to the increasing temperature as the drill got lower. The drill would melt. In addition, the heat would set off the explosives long before they reached a point at which they could set off any volcanoes.
619332
The container, because it's in contact with the outside environment, is a heat sink/source and thus it will be at a slightly lower or higher temperature than the solution.
897192
Schist = cooked mud (i.e. no water left trapped, clay minerals got cooked to less water containing minerals such as micas). How long depends on the thickness of the sedimentary rocks deposited on top of the particular clay layer (pressure helps evacuate water and increases temperature); whether or not there is an external heat source (volcanic activity, magma chamber nearby, metamorphic processes - faults, etc.). SO - time can't be specified unless is a case study, temperature -  between 150 and 200 degrees C. Above 200 c is the schist kingdom in metamorphic rocks.
1046721
Drilling into the crust can not possibly affect the internal temp of the earth. We can NOT possibly dig deeper than that. easy. Next question.
397453
number 4 is partially right. By Gay Lussac's Gas Law, pressure DOES affect temperature directly - more pressure, more temp.
564184
Haystar P from Haytak FZE is used for the above application.\n\nThe main requirement for Oil Well Drilling Applications is that the starch is soluble at room (or desert) temperature. Normal plain starch dissolves only when boiling. This would be unpractical at the rig site. In order to modify the native starch to become water soluble at room temperature, the most successful way is by extrusion. This machine, usually very expensive and big, continuously heats, pressurizes and mixes the native starch with any additional required additives. As a result, a granulated high temperature starch is produced, which has many applications in addition to Drilling Starch. This product is also used in Foods as well as Paints, Cardboard and Paper industry. \nObviously, the higher temperature the starch is run at in the extruder, the higher it can withstand during drilling!