... of the drilling mud window. Using mud weights below those values can lead to several problems, such as inflows, excess reaming, poor hole cleaning conditions, excess cavings, pack-offs, stuck pipe, and more severe issues, such as loss of the hole or uncontrolled blowouts. Methods to estimate pore pressure...

... by the high mud weight. Firstly, an underbalanced drilling technology strategy and mud weight reduction implementation process in shale reservoir are proposed. Secondly, based on the identification of abnormal high pressure mechanism, the pore pressure prediction model is optimized, and the fluid-solid...

... than the static mud weight. This work shows that in some cases this is unlikely to be the leading interpretation and reacting to the gas by increasing the mud weight can exacerbate the situation. Here, we clearly show that the pumps off gas seen from this well is a result of fault reactivation...

... ABSTRACT A previously developed geomechanical model for a drilling test site was updated for a new, innovation test well drilled on the same site. New offset loss circulation data were evaluated and updated for the minimum horizontal stress profile. Critical mud weight window considering...

.... An implicit root-finding approach is used to solve for the range of safe mud weights for the full inclination-azimuth parameter space, which greatly improves computational efficiency. Three-dimensional finite element modelling was also conducted to investigate the influence of the heterogeneity introduced...

... Abstract A proven field wellbore stability model provided mud weight (MW) calculations with high confidence for a shelf sea project in the Caribbean region. A well was drilled that experienced instability and presented with drilling temperatures that were much higher than any offset wells...

... function wellbore stability model model parameter mud loss caliper data mud weight inversion scheme fracture ARMA 21 1831 Automatic Calibration of Wellbore Stability Models With Hard and Soft Constraints Birchwood, R.A. Schlumberger-Doll Research, Cambridge, Massachusetts, USA Rajaiah, N...

... well trajectory should be around 45 degrees from maximum horizontal stress. Hence, the fluid density has been adjusted with respect to well trajectory parameters to mechanically stabilize the wellbore. Reservoir Characterization reservoir geomechanics Wellbore Design mud weight shale...

... database well control fracture pressure fault damage zone mechanism ECD monitoring failure mechanism Wellbore Design reactivation pressure mud weight formation pressure fault reactivation pressure Drilling ARMA 19 382 Overcoming subsurface and batch drilling challenges in a heavily faulted...

...% at concentrations of MPP as less as 1-4%, and filter cake was enhanced as well when comparing to the reference mud. In addition, MPP had a negligible to minor impact on mud weight, and this effect was resulted due to foaming issues. Other properties such as salinity, calcium content, and resistivity were negligibly...

... of the intermediate principal stress, the Mogi-Coulomb criterion predicts lower values of the minimum required mud weight than does the Mohr-Coulomb criterion. Wellbore Design wellbore integrity reservoir geomechanics Reservoir Characterization borehole stability analysis elasticity breakout pressure...

... Windalia and/or Muderong formations, borehole stability was a priority to be addressed. On top of that, lost circulation events in the Pyrenees reservoir sands in previous wells pointed out that the drilling window could become extremely narrow or nonexistent, as increasing the mud weight to keep...

... ABSTRACT: Rising demand in higher productivity as well as reducing drilling damages has encouraged companies to use mechanical earth modeling (MEM) for developing fields. Conventionally, in a safe mud weight window there are four different bounds which are employed by drillers to avoid...

..., it is imperative to build a geomechanical model to plan and execute safe and efficient drilling operations. Compensated neutron density log and sonic log were used to build the geomechanical model, together with offset and actual mud weights. Formation stress, rock strength, minimum mud weights and fracture...

... ABSTRACT: Probability theory has been increasingly applied to address the uncertainty of geomechanical parameters for prediction of allowable drilling mud weight. When conducting wellbore stability analysis, input parameters are estimated from well log data and empirical correlations...

... weight program attempted to account for possible over pressure and weaker clay-rich zones while at the same time avoiding high losses. The new mud weight program allowed for significant borehole breakouts to occur in order to decrease mud losses; losses were half the amount compared to the previous well...

... pressure with no drilling fluid returns when circulating. In this regard, a geomechanical analysis for southern Iraqi field was performed on field data from 45 deviated. The analysis identified the following areas of improvement. First, the mud weight being used was not changed properly with respect...

... Abstract A large number of challenging ERD wells have already been successfully drilled in the Chayvo field using stability mud weights determined by a field-specific wellbore stability model. The original wellbore stability model was based on local insitu stresses, sonic log and shale...

... to estimate the osmotic pressure resulting from an imbalance of water activities—in effect, estimating a higher mud weight needed to stabilize the well. This methodology was applied to a well drilled in the North Sea combined with mechanical wellbore-stability analysis and shows good agreement with wellbore...

... in-situ stress magnitudes, orientations and formation properties. The stochastic risk and sensitivity analysis were performed using thirteen well data to evaluate the sensitivity of the input data on the study outcome. Results show that higher mud weight is expected to minimize wellbore instabilities...