Looks like they permitted to perf a 20' section in Zeke - which was drilled at an 80 deg angle as per the enercom CC:
08/19/2013 08/19/2014 PERFORATE VERBAL 08/19/2013 5800 N 5800 PERF FOR PROD F/ 6182-6202'
Question for the experts: Since they are perfing, that means they did not run a slotted liner/gravel pack assembly, right?
My expertise is questionable at best & is not normally associated with such young sediments & the challenges associated highly unconsolidated sands. However, I can verify that Zeke's permit to perforate lets us know that SARA has chose a far better completion route for Zeke.
You sure yall probably already know this, but here are some basic definitions & such for those who don't know:
Casing - pipe that is run all the way to surface & cemented into place, forming a seal. According to the API the only function of casing is to prevent the well-bore from collapsing. However, it does form a seal & with carefully placed cement it can isolate individual zones behind the casing. This is important for production, but equally if not more important in drilling by allowing the driller to isolate formations of abnormally high or low pressure or problematic formations behind casing and then drill deeper.
Liner - Casing that is not run all the way to surface to save cost, but is hung inside a previous casing string using a liner-hanger (a type of packer). Liners are just like casing in every other way
Slotted Liner - Liner that is already has holes in it for production.
Perforating - Using shaped charges to shoot a stream of ionized metal through the casing, cement, and formation at a given depth. Perforations are effectively 'holes' for oil &/or gas to flow through.
Gravel Pack - a wire basket that is very tightly packed full of gravel. these can be any diameter (usually 5 to 9") and can range in length from 10' to 200+ feet. Gravel packs serve the same purpose as a slotted liner - they keep the well-bore from collapsing while allowing oil/gas to flow.
My interpretation is that SARA is going to try & get some added production out of Zeke before they reporting Rocky's results.
My understanding & thoughts on the two wells is thus:
Rocky - They drilled a pilot hole at a medium angle through the sand and logged to get the oil/water contact. they then plugged back, kicked out, and built curve to get the horizontal section. They drilled the full 750' of horizontal and then ran a slotted liner filled with gravel into the open hole. Some reading on the net that I've done on this seems to point that this is a fairly common practice for completing horizontal legs. The risk is how accurate they were with getting the horizontal leg into the ~10' oil portion of the sand. If they are too high, then the well will not flow very good because they will be in ratty sand and/or shale. If they are too low, then they will be producing more water than oil. They sounded (at Enercom) like they feel they did pretty good with hitting the horizontal target. But, the proof will be in the flow results. They stated that the last 400' of the horizontal should give the best production. I'm guessing that they were a little high for the first part of the horizontal before it entered a better section of the sand (maybe the horizontal was going towards a slight updip of a rather flat structure?).
Zeke - With Zeke, they drilled at a high angle (about 80 deg at the bottom part of the well) through the sand, logged (to find the o/w contact), ran a liner & cemented. They will perf 20' of the high angle section - which should be the top oil part of the sand. At Enercom, they stated that they thought the flow from Zeke would be somewhat less than Rocky - but that it cost less to drill Zeke than Rocky.
That would be installed next --would not want to try to perforate through the gravel pack-would reduce it's effectiveness too much.
That probably is a measured depth 20' so correct it for 80 deg and that would be sl less..
Hope that short interval is separated from water by a thin shale bed.