Ah ok. I see what you mean. you want to disable the edit of a field on the front end form but still have it displayed.
You should edit the file form.php of the view address and change the code
echo $this->fieldsClass->display($oneExtraField,$this->address->$fieldName,'data[address]['.$fieldName.']');
to the code
if($fieldName=='YOUR_CUSTOM_FIELD_REALNAME'){ echo $this->address->$fieldName;}else{echo $this->fieldsClass->display($oneExtraField,$this->address->$fieldName,'data[address]['.$fieldName.']');}
And replace YOUR_CUSTOM_FIELD_REALNAME by the realname of your field.