GREY:CIMVF - Post by User
Comment by
alberta_canada1on Jul 18, 2008 2:46pm
452 Views
Post# 15307530
RE: Can not believe this ....
RE: Can not believe this ....Exactly, once the open hole logs are done and interpreted, they will know if it is worth pursuing further (running casing, perforating, possible frac, flow testing).
The public probably won't get much info from the open hole logs. Those logs, once interpreted, are merely to determine the zones of interest (their exact depths, and widths) so a perforating schedule can be determined. The company may report on the depths and widths of the zones in a detailed news release, or they may simply state the number of zones of interest and that they are going ahead with running casing and perforating. I've seen companies take both approaches.
Worst case - Pack it up and leave
Good case - Determine 1 zone, and decide to run casing and perforate that 1 zone
Best case - Determine multiple zones, and run casing and perforate the multiple zones.
From there, they go ahead and run casing, and cement that casing into the well bore. They will run a bond log but usually make no mention of it in the news because it's usually done hand in hand with perforating. The wireline crew runs in and does the bond log....the consultant and wireline engineer go over the bond logs and determine if the cement is good (no voids or leaks through to surface), and they go ahead and perforate afterwards. If the cement bond isn't good, they'll do another cement squeeze before perforating and that will eat up more time. The length and number of perforating guns sent in the hole is based on the width and number of the zones they wish to perforate. 10m zone = 10m worth of perf guns sent in the hole. I've been on wells where a single 0.5m gun was sent in the hole, and I've been on wells where several 6m perforating guns are linked together and run into the hole on select fire systems to nail multiple zones and widths on one pass with the wireline. It all depends on whats down there.
After perforating, they may decide to fracture stimulate the formation, or they may not. That all depends. After all of that is completed, then it is time to flow test.
Cheers