I found these to be excellent posts about prayer by David Wilkerson.
In a marriage crisis I think prayer like this is very appropriate, and I know at times I did it whether verbally or in writing.
http://davidwilkersontoday.blogspot.com/2009/05/greetings-in-precious-name-of-our-lord.html
http://davidwilkersontoday.blogspot.com/2009/06/lord-is-merciful-and-good-to-those-who.html