struggling with an xpdo query

SELECT * FROM mytable 
WHERE param=true 
AND ( 
        (user=$user AND owner=$owner) 
        OR 
        (user=$owner AND owner=$user) 
);

$d->where(array(
	'param' => true,
	'user' => $user,
	'owner' => $owner ));

$d->orCondition(array(
	'param' => true,
	'user' => $owner,
	'owner' => $user ));

$d->where(array(
    array(
        'param' => true,
        'user' => $user,
        'owner' => $owner
    ),
    array(
        'OR:param:=' => true,
        'user' => $owner,
        'owner' => $user 
    )
));

$d->where(array(
   array(
      'param:=' => true,
   ),
   array(
      'user:=' => $owner,
      'OR:owner:=' => $user,
   )
));