Here are two different scripts for converting weburl fields in 4.7 up to 5.

Submitted by Nilard:

Here is my way of converting weburl fields. First, you should create a link field named 'link', then run the following script:

  require_once './includes/bootstrap.inc';
  drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE);
  drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);

  $result = db_query("SELECT nid FROM {node}");

  while($node = db_fetch_object($result)) {

    $node = node_load($node->nid);

    if (empty($node->field_link)) {
      $weburl = db_result(db_query("SELECT field_weburl FROM {node_field_weburl_data} WHERE nid = %d", $node->nid));
      if (!empty($weburl)) {
        $node->field_link[0]['url'] = $weburl;
        $node->field_link[0]['title'] = $node->title;
        node_save($node);
      }
    }

  }

Submitted by reikiman (note that this is a pure PHP script and not a "Drupal" script):

if ($db = mysql_connect('dbhost', 'username', 'pass')) {
  mysql_select_db('dbname');
  $result = mysql_query('SELECT node.nid as nid, node_field_weburl_data.field_weburl as field_weburl, node.title as title FROM node, node_field_weburl_data WHERE node.nid = node_field_weburl_data.nid', $db);
  while ($row = mysql_fetch_assoc($result)) {
    if ($res2 = mysql_query('SELECT nid FROM content_type_content_website WHERE nid = '.$row['nid'])) {
      if (mysql_num_rows($res2) > 0) {
        $query = sprintf("UPDATE content_type_content_website SET field_url_0_url = '%s', field_url_0_title = '%s' WHERE nid = %d",
          mysql_real_escape_string($row['field_weburl'], $db),
          mysql_real_escape_string($row['title'], $db),
          $row['nid']);
        mysql_query($query, $db);
      } else {
        $query = sprintf("INSERT INTO content_type_content_website (vid, nid, field_url_0_url, field_url_0_title, field_url_0_attributes) "
                ." VALUES(%d,%d,'%s','%s','N;')",
                $row['nid'], $row['nid'],
                mysql_real_escape_string($row['field_weburl'], $db),
                mysql_real_escape_string($row['title'], $db));
        mysql_query($query, $db);
      }
    }
  }
}