Notes From The File Report For The XTO Three Forks Well, The HBU Boucher #21 -- Dececmber 24, 2019

The well (link here):

• 17147, 2,101, XTO, HBU Boucher 41X-21, a Three Forks well, Hofflund, t4/09; cum 911K 10/19;

From the file report:

• Williams County
• Three Forks; other formations evaluated during the drilling
• the middle Bakken was evaluated while building the curve section, prior to landing in the Three Forks
• spud December 10, 2008 
• vertical drilled to 9,345' where the curve build was kicked off
• subsequently drilled to a measured depth of 10,041 feet; drilled into the Three Forks
• due to the high volume of gas cutting the mud weight, the salt water was replaced with CaCl water ,at a measured depth of approx 15,500 feet, and then heavier CaBr water, before converting back to a diesel invert mud stystem at 17,428 feet
• the lateral was drilled from the casing points; total measured depth of 21,030 feet; 
• middle Bakken: 3' thick; well defined target zone approx 9' below the base of the upper Bakken shale, from 9,665' to 9,668'
• Three Forks:
• gas readings were initially 125 to 150 points; gradually increased to 750 to 10,000 units (sic) as the lateral approached the top of the target
• measured depth of 10,013' and a TVD of 9,764';
• for most of the lateral, the high volume of gas required the mud to be diverted through the gas buster, resulting in consistently strong flares
• extremely strong flares, at time exceeding 50' (sic) were observed with trip gas and downtime gas kicks
• difficulty in controlling the gas during trips eventually resulted in changing back to a diesel invert mud system at 17,428' in order to be able to keep the mud weight above 13 ppg
• from approx 19,000' to TD, mud weights ranging from 13.5 to 13.8 ppg were needed to keep the well from flowing while drilling, and trips after 20,000' required at least 16 ppg kill mud in the vertical section to maintain control of the gas