Critical condition study of borehole stability during air drilling
نویسندگان
چکیده
منابع مشابه
Using Borehole Geophysics Measurements to Assist Drilling, a Case Study From Presalt Brazil
SUMMARY Use and interpretation of wireline lookahead VSP combined with LWD seismic while drilling and LWD sonic log for base of salt prediction, a case study offshore Brasil deep offshore Campos. It aimed to assist drilling decisions by obtaining a more accurate prediction of Base of Salt depth. Setting the 9-5/8" casing point was key from a drilling perspective.
متن کاملStudy on Wellbore Stability of Shallow Sediments in Deepwater Drilling
Method: In this paper, the shallow formation around the borehole is divided into plastic zone and elastic zone considering it under nonuniform in-situ stress. The collapse pressure formula of shallow formation is derived by taking the shrinkage rate of the borehole as the instability criterion. The fracturing pressure calculation model of shallow sediment under non-uniform in-situ stress is der...
متن کاملEffect of pulse pressure on borehole stability during shear swirling flow vibration cementing
The shear swirling flow vibration cementing (SSFVC) technique rotates the downhole eccentric cascade by circulating cementing fluid. It makes the casing eccentrically revolve at high speed around the borehole axis. It produces strong agitation action to the annulus fluid, makes it in the state of shear turbulent flow, and results in the formation of pulse pressure which affects the surrounding ...
متن کاملStress Inversion of Coal with a Gas Drilling Borehole and the Law of Crack Propagation
Tianjun Zhang 1,2,3, Lei Zhang 2,3,* ID , Shugang Li 2,3, Jialei Liu 4, Hongyu Pan 2,3 and Shuang Song 2,3 1 College of Science, Xi’an University of Science and Technology, Xi’an 710054, China; [email protected] 2 School of Safety Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; [email protected] (S.L.); [email protected] (H.P.); [email protected] (S...
متن کاملEffects of tool eccentricity on wave dispersion properties in borehole acoustic logging while drilling
In this paper, a finite element approach is applied to study the dispersion properties of non-leaky acoustic waves inside boreholes with off-centered LWD (logging while drilling) tools. Both soft and hard formation cases are studied with focus on phase velocity dispersions of Stoneley, dipole and quadrupole modes. When an LWD tool is off-centered, the dispersion curve of the Stoneley mode shift...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Petroleum Science
سال: 2009
ISSN: 1672-5107,1995-8226
DOI: 10.1007/s12182-009-0025-9