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Cement squeeze invasion depth

Cement squeeze invasion depth

Cement squeeze invasion depth

(OP)
Hi,

I am trying to estimate the radial depth of invasion of a cement squeeze job.  

In a well I am looking at a gas zone that was perforated and tested and then abandoned by cement squeeze.  I would like to reperforate or jet abraze to produce the zone.  

Porosity of the zone is approx 20% and permeability 10mD.  From the completions reports 0.2m3 was squeezed into the formation.

Any idea on how deep I will have to perforate in order to get past the cement damage?  The charges I usually use to perf a zone like this have penetration depth of about 24.5".  

RE: Cement squeeze invasion depth

The quick & dirty way would be a volume calulation: what volume of rock does 0.2m3 of cement in the pore space occupy, and then calculate a depth from the wellbore.

Looking at the skin factor, a quick search of the SPE library shows several papers looking at formation damage by cement filtrate invasion such as:

SPE 19305-PA  Formation Damage Caused by Cement Filtrates in Sandstone Cores
 
SPE 30087-PA  An Experimental Evaluation of the Formation-Damage Potential of Cement Filtrates and Leachates

SPE 25218-MS  Permeability Damage Due to Precipitation of Insoluble Salts From Cement Slurry Filtrate

Happy reading!

RE: Cement squeeze invasion depth

(OP)
Thanks, I will download those papers and spend some time reading.  

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