drilling a hole

how far in feet can the oil company drill a bore hole..i seen one that was 7000 feet can they go more ?

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Permalink Reply by Joseph-Ohio on January 6, 2014 at 1:20pm
Don't know for sure but, they've gone beyond that off-shore if I'm recalling what I've read correctly.
Permalink Reply by Mark McGrail on January 6, 2014 at 1:43pm

Why are you asking ?

Permalink Reply by Joseph-Ohio on January 6, 2014 at 2:04pm
Don't know why the poster asked but as for myself I'm reading and trying to learn a few things about Gas and Oil well development.

I find it all very interesting.
Permalink Reply by Mark McGrail on January 6, 2014 at 2:16pm

Joseph ,

I asked because in the Gulf the laterals are quite lond.

On shore in the shale plays are experimenting with different length laterals in different areas.

Permalink Reply by Joseph-Ohio on January 6, 2014 at 2:21pm
I took it that the poster was talking about a vertical bore but now wondering if he was inquiring about a vertical or a lateral or both ?
Permalink Reply by Jim Litwinowicz on January 6, 2014 at 2:22pm

In Pa, they are going down to a total depth of over 7000' and drilling laterals that are 6000-7000' for a total of approx 14,000'  There are drilling rigs capable of more but not in use here.  Maybe someday they will bring these in also.

Permalink Reply by Joseph-Ohio on January 6, 2014 at 2:50pm
Something like that would demand a few horses (horsepower).
Permalink Reply by The Hiker on January 6, 2014 at 3:03pm

These are the longest horizontal sections I've found in the Utica so far:

CNX        NBL 19B       11,018'

Antero     Myron            11,622'

Permalink Reply by pg guy on January 7, 2014 at 3:01am

Try 35,000+ ft horizontal bore in Qatar, at the bottom of 5,000+ ft vertical.

http://www.drillingcontractor.org/continuous-improvements-lead-to-m...

Permalink Reply by Brian Powers on January 7, 2014 at 4:28am

m&y -

During my 31 years in the O&G business, the deepest onshore vertical well that I worked on was about 12,000 ft measured depth (MD). The deepest well with lateral that I worked on was 17,000 ft MD (12,000 ft vertical with a 5,000 ft lateral).

Offshore, the deepest high angle well that I worked on was 24,000 ft MD (60-70° deviation through the pay zone)

The rig equipment is usually the limiting factor: mud pump HP to provide circulation ability, draw works hoisting capacity to suspend and move heavy loads such as drill-pipe, casing or liners, and rotary table or top-drive-sub torque to initiate movement and rotate pipe.

Brian

Permalink Reply by Joseph-Ohio on January 7, 2014 at 4:53am

Curious to learn how much horsepower it takes to install new sections of casing / drive and turn the bit considering that length and stationary weight of the installed casing segments ? ?

Permalink Reply by Brian Powers on January 7, 2014 at 6:14am

J-O

I looked up data for an offshore floating rig (semi-submersible) that I'm very familiar with. The rig basics:

derrick maximum load: 1,500,000 lbs.

mud pumps: 3 pumps rated at 1,600 hp. each

Top drive rating: 50,400 ft.-lb. of torque at 120 rpm in low gear.

The first time that I flew offshore in the Caspian sea to a platform rig, 9-5/8" diameter casing was stuck at about 2700 meters measured depth. The rig's derrick load capacity was 1,250,000 lbs., as I recall. The pipe was worked repeatedly to about 700,000 lb in an attempt to free it and pull it from the hole. When this was unsuccessful, we cemented in place, drilled out and ran a smaller diameter liner deeper before drilling the open hole section and completing. I fondly remember the groaning of the steel derrick members and the block/tackle equipment as it strained under the load.

It's worth knowing that pipe in a mud filled hole is buoyed by the mud and is not as heavy as the pipe weight in air. But if the pipe connections or other hardware (centralizers, circulating sleeves, etc.) are dragging on the low side of the hole, then the hoisting equipment can be tested severely.

Brian

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