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Geothermal Well Design

  
Good morning everyone,
I am looking for information about Geothermal well design, materials/grades/ connections used during the well construction.

Thanks for your help.




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01-05-2022 02:17 AM

The is a paper, published in Geotermics (see link below), may help you. Objective of this paper is to share the knowledge and experience gained during drilling fluids application at 270 geothermal wells (1000 to 3600 meters) with major operators in Turkey since 2014.

https://doi.org/10.1016/j.geothermics.2020.101897

12-24-2021 12:40 AM

Hermes,

I had to think a good ways back, like 35 years, but when I was the Senior Drilling and Production Engineer for Chevron Geothermal (the ONLY Drilling and Production Engineer...) we were drilling a number of good sized water wells in southern California near the Mexican border.  We drilled off "islands" in the farming country with wellheads about 20 feet apart and all direction to hit different highly prolific sandstones down to 10,000 feet.  We drilled 24" to about 1600 feet, then set and cemented 16" casing for surface.  We then drilled 12 1/4 " to TD, up to 13000 feet MD, and set 10 3/4" and cemented with very light perlight cement, sometimes foamed, but not a lot.  We were dealing with normal pressures, and just had water as the reservoir fluid.  We used buttress threads all around, tough and no real pressure to say, and set some casing packers, filled with cement, between some zones, and to ensure at least some bond between casing and hole at points. We did not use tubing, so had 16" master valves and produced a lot of fluid per well, like 40,000 to 60,000 equivalent bpd.  A pretty amazing project all around, not sure people are doing things differently now, 35 years later?

12-03-2021 08:56 AM

Matthew, Thanks a lot.

12-03-2021 07:03 AM

A good place to start is the New Zealand Standard NZS 2403:2015, “Code of practice for deep geothermal wells” (https://www.standards.govt.nz/shop/nzs-24032015/). I’ve found it to be a solid resource.