Laboratory-scale fracture conductivity created by acid etching

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Title: Laboratory-scale fracture conductivity created by acid etching
Author: Pournik, Maysam
Abstract: Success of acid fracturing treatment depends greatly on the created conductivity under closure stress . In order to have sufficient conductivity , the fracture face must be non -uniformly etched while the fracture strength maintained to withstand the closure stress . While there have been several experimental studies conducted on acid fracturing , most of these have not scaled experiments to field conditions and did not account for the effect of rock weakening and etching pattern . Hence , acid fracture conductivity predictions based on the above works have not been able to match actual results . In order to develop a more appropriate and accurate prediction of acid fracturing treatment outcome , a laboratory facility was developed that is properly scaled to field conditions and enables analysis of etching pattern and rock strength . A systematic experimental study that covered a variety of formations , acid types , and acid contact times was conducted . An acid fracture conductivity correlation was developed based on etched volume , etched pattern , and fracture strength under closure stress . Results suggested that there is an optimal time of acid exposure resulting in maximum fracture conductivity . There were large differences in the conductivity created with the different acid systems tested due to different etching patterns and degree of rock strength weakening . There was an optimal acid system depending on formation type , contact time and overburden stress . The acid fracture conductivities measured did not agree with the predictions of the Nierode -Kruk correlation . The newly developed correlation predicts conductivity much closer as it includes the effect of rock strength and surface etching pattern on resulting conductivity .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2361
Date: 2009-05-15

Citation

Laboratory-scale fracture conductivity created by acid etching. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2361 .

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