We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Borehole Stability in Mudstone Shale and Coal Seams in the Daniudi Gas Field.
- Authors
Hao, Yang
- Abstract
In order to study the reasons for borehole instability, we calculated the mud density window for horizontal wells in complex formations based on logging data. From the results of the mud density window calculation, we found that for mudstone shales it decreases as the inclination angle and the azimuth increase, while for coal it took on negative values. We found that collapse and expansion are conducive to maintaining borehole stability, while in coal seams a positive mud density window can be achieved only by collapse (a decrease in the borehole diameter). It was determined that we need to increase the mud density from 1.2 to 1.4 g/cm and use drill pipes that are as small as possible for the longest possible period of time. In this case, the borehole trajectory should be determined according to the seam location and the mud density.
- Subjects
COALBED methane; GAS fields; BOREHOLE logging; HORIZONTAL wells; MUDSTONE; LOGGING
- Publication
Chemistry & Technology of Fuels & Oils, 2016, Vol 52, Issue 2, p185
- ISSN
0009-3092
- Publication type
Article
- DOI
10.1007/s10553-016-0689-y