Tubing pressure and Casing pressures

[medrano]

Hello,
I need help with one of my wells. We ran in three
diffrent kind of new packers and we still have the same
pressures. 2500psi. on tbg. and 900psi. on casing.
I do not know if it is the packer or we have a casing leak
It is also a new drill. If anybody has been threw this
problem let me know something please

 

[DrillerNic]

I have on the well from hell (150days over AFE!!). The completion came out twice, we were investigating outer casing strings leaking, tubing hanger leaks, leak testing with inflatables in the tubing, and .... it was horrible!

Anyway, you say it's a new well. Did the tubing pressure test? How did you test the tubing (against a plug set in the end of the tubing or against the casing before you perforated?). Did the A annulus test? How did you test the A annulus? Do the results of these tests tell you anything? The other thing to consider is the completion architecture: do you have any sliding sleeves that oculd have failed? Any PBRs that could leak and so on?

Ultimately, you may have to retest the tubing against a deep set plug- most completions have a nipple at the end of the tubing for this purpose- while monitoring the A Annulus. Then test the A annulus, while holding pressure on the tubing and then after letting the pressure off the tubing. If there's no pressure loss in the tubing during teh tubing test (or pressure gain on both the annulus tests) it's probably a packer. If you see a tubing pressure gain on one of the annulus test, then you've proabably got a problem with the jewellry somwhere- these often have chevron (ie paired one way) seals. otherwise you're in our situation- looking at the outer casing strings and so on (eventually our problem was traced to an out of tolerance wellhead).

 

[medrano]

Out of tolerance wellhead! What is that.
Well this is what i have done to that well, on the
last packer we set, we trapped 1800psi. below our
packer by setting a blanking plug on our profile.
Then from there I Tested the tubing to 2500psi It
tested good. Then I shut the casing and held 2500psi.
on the tbg. Casing was coming up slowly but tbg. was
not loosing any pressure. It takes about 2 days to pick
up 200psi. Then we released the psi. on the tubing and
went the other way by putting 1000psi. on the casing and
left the tbg. shut with 0psi. Casing stayed at 1000psi.
and tbg. at 0psi. Then I released casing pressure to
500psi. and checked in about two day and i had a increase
of 200psi. (700psi. on casing)

 

[sweetpapajones]

I know this is a little late in trying to help and I hope that you have already solved this issue.

I don't know if you have a liner top in the hole or not but to me it sounds like it could be a leaking liner top. I have dealt with a couple of cases where the liner top would seal off under pressure but once the pressure was released the leak would return. The only way find out for sure if it is the liner top is to do a negative test.