<?php

// Add to your (child) theme's functions.php

add_filter( 'term_link', function( $termlink, $term, $taxonomy ) {
    if ( 'portfolio_skills' == $taxonomy ) { /* TODO: this taxonomy name may need to change? */
        $termlink = '/wineries-2/?_wine_types=' . $term->slug;
    }
    return $termlink;
}, 10, 3);