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Cementing Discussion
Posted on 5/5/10 at 8:01 am
Posted on 5/5/10 at 8:01 am
I read a lot about improper cementing and was wondering if the pros could explain the process and why the DH was using cement. I thought cementing was used to plug a well, I don't understand why cementing occurred if this was an active well.
2
Posted on 5/5/10 at 8:10 am to MSTiger33
Cement is also used to, well, cement the strings of casing in place.
Lets say you start with running 26 inch drive pipe to 600 feet. The would cement from 600 ft up. After they might run a conductor string of casing, down to 1200 ft, and cement that in. They'd do that for every string of casing to add wellbore stability.
That's laymans terms. The cementing experts can give you more detail.
But cement can be used for casing like stated above. Or it can be used to plug the way, or close off one formation so you can plug up/down to another one. You can use cement to squeeze your perfs in order to stop flow from that zone. There's different things it's used for.
Lets say you start with running 26 inch drive pipe to 600 feet. The would cement from 600 ft up. After they might run a conductor string of casing, down to 1200 ft, and cement that in. They'd do that for every string of casing to add wellbore stability.
That's laymans terms. The cementing experts can give you more detail.
But cement can be used for casing like stated above. Or it can be used to plug the way, or close off one formation so you can plug up/down to another one. You can use cement to squeeze your perfs in order to stop flow from that zone. There's different things it's used for.
Posted on 5/5/10 at 8:14 am to MSTiger33
Its not just used to plug a well. Its also used to bond the casing to the formation and to seal off a completed zone or to put a plug in the well to isolate an upper interval from a lower one. In this case I believe they were setting a bridge plug up the hole to isolate the downhole section in order to temporarily abandon the well. Later, when its time to complete and produce the well, they would just drill the cement plugs out and go back to bottom to complete the reservoir interval.
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