I have interest in a well in Howard County that has been in production since 2010. I have not received any of the royalty payments to date. I finally got Apache to admit their error and agreed to pay me back to late 2010. However, half of the production was from early 2010 when Mariner Energy held production. Are they responsible for their half even though they no longer own the well? Is Apache responsible for all with their purchase? I also, for some reason, thought Apache acquired Mariner. What should be the interest rate on this production held?