What is the meaning "Cause I walk like I've got oil wells Pumping in my living room?

The poem Still I Rise by Maya Angelou is a very powerful work of literature. The author writes, "Cause I walk like I've got oil wells Pumping in my living room" to show that she is better off without the man she is directing the poem towards. She is trying to say that like oil wells she is rich, not only physically she herself has a lot of worth.