acceptable PPA results on the 60 micron disk. The fluid was tested at 250ºF and 1,500 psi. A scanning electron microscope (SEM) photograph of the filter cake, on a 35 micron disk, is shown in Figure 1. No evidence of mud penetration into the PPA disk was observed. The formation damage potential was assessed by

Jun 1, 2017 · Mud cake is defined as the solid deposition of the particles filtrated during the invasion of drilling mud into the porous rocks. Filtrate liquid and the deposited mud cake are characterized according to the size of the mud solid particles, mud additives, and concentrations.

The objective of this study is to evaluate the effect of the mud filtrate of barite-weighted water-based mud on the geomechanical properties of four types of sandstone rocks (Berea Buff, Berea Spider, Bandera Brown, and Parker).

Mar 1, 2017 · experimental and modeling results of mud filtration for Berea upper gray, Berea buff, Bandera brown and Michigan sandstones represents the modeling results for these cases.

Aug 7, 2023 · Sandstone cores (2.5-in. diameter and 1-in. thickness) were utilized to replicate the formation during filtration experiments. The filtrate fluid was collected and the sandstone cores with...

Experimental data is presented to show that the pressure required to initiate flow into the wellbore after building up a filter cake is affected by rock permeability; mud properties, such as particle size and cake yield strength; flowback velocity; and overbalance pressure.

Oct 1, 1993 · A series of drilling mud invasion experiments were conducted on Berea sandstone cores to measure the extent and depth of formation damage by mud filtrates and mud particles.

a low permeability internal mud cake can positively change the effective stress around the borehole wall. This makes mud cake wellbore strengthening a successful process. Drilling fluids filtration occurs when drilling fluid particles deposit on the wellbore surface to form an external filter cake. The external is

A HPHT filter press was used to build a filter cake over 2.5 inches of Berea sandstone core and a ceramic disc at 212 F and 300 psi di erential pressure. Then, in the same cell and at the same conditions,

By proper selection of the weighting agent particle size and size distribution, it was possible to form a thin, dense mud cake, which was conducive to decrease the filtration loss.