Schlumberger

OPTIBRIDGE

Overview Library

Unique software for optimum bridging agent selection

Any fluid entering your reservoir affects production.  Whether it’s a kill pill, a reservoir-drill-in fluid or one designed for lost circulation or perforation sealing, it must be formulated precisely to block invasion and, ultimately, prevent formation damage.  The first step in designing a non-damaging fluid is to determine the ideal particle-size distribution for the bridging material. 

Our proprietary OPTIBRIDGE software gives the M-I SWACO engineer a tool for precisely and quickly selecting correctly sized bridging agents.  With OPTIBRIDGE, the M-I SWACO engineer inputs formation data as well as information about locally available products.  Then the software calculates the “best-fit” mixture of locally produced bridging particles for packing your formation effectively.

OPTIBRIDGE is used in the design of fluid loss control pills by delivering formulations   for the optimum blends of particulate bridging agents.  Once engineered, these blends form a tighter and less invading filter cake to seal pores, fractures, or completion screens. 

The software is based on the Ideal Packing Theory or D1/2-rule. This rule states s ideal packing occurs when the percent of cumulative volume vs. the D1/2 forms a straight-line relationship. There, D is the particle diameter. The output from OPTIBRIDGE is the optimum blends or portions of the selected bridging agents. The result is a tighter and less invading or damaging filter cake to seal the given pore size or fracture width.

Applications

This software tool is particularly useful for drill-in fluids and other systems used to drill and seal producing formations that require optimum sealing and minimal reservoir damage.

The primary application of OPTIBRIDGE is designing a tighter and less damaging seal over a formation or screen.  The first step in the process of forming an optimum seal is defining the pore size, fracture width or screen type from a screen-type dropdown to be sealed with a tight filter cake with minimum invasion damage. 

The maximum or average pore size in microns can be obtained from thin section analysis, a scanning electron microscope (SEM) or the maximum threshold entry radius that is determined from capillary pressure measurement.   If no pore size data is available, the permeability option can be used by inputting the maximum permeability in millidarcies (mD).  The average pore size (in microns) can be estimated from permeability by taking the square root of the permeability (in millidarcies).  However, permeability should only be selected as the last resort.

The second step is to select possible bridging agents and their particle size distribution (PSD) data from the bridging products PSD file.  Another option is to analyze the bridging agent sample and create an individual PSD file.

After the Optimum Blend option is selected, the output provides the optimum portions of the recommended bridging agents for the given pore size, fracture width or screen.

The secondary application of OPTIBRIDGE is generating the PSD data for a blend of selected bridging agents or fluids. Again, these blends are based on the PSD and concentration of each selected bridging agent or fluid.

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