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Reverse Cementing
01 February 2018

Hi,

we are planning a reverse cement Job for 24" casing run in 28" hole size, the previous casing is 26" - ID - 25"

26" casing setting depth - 2700ft

24" casing setting depth 3650ft.

The Top of cement behind 24" casing is 2300ft. covering a big loss zone.

FG at 24" casing depth 10.5ppg

MW drilling was 9.1 ppg

I appreciate your help understanding what way to go- Conventional cementation or Reverse cementing.

What are the Hi-points or Low points for Both.

What is achievable having good cement bond behind casing covering the loss Zone.


If anyone has case studies , SPE papers kindly share.

Appreciate your help

Thanks & Best Regards,

Hari.



 

1 answer(s)
snas
Independent Consultant
Olango Consulting
Total Posts: 10
Join Date: 23/03/16
Hari

Never done reverse cementing but it was discussed on an air drilling job I was on. In the end we decided that a stinger cementation was much simpler.

To reverse cement you need to have the casing open at the bottom. The dis-advantage there is that any cement that gets to the shoe will U-tube up the casing and that requires careful control. Basically you need to have the inside of the casing closed and maintain pressure.

Pumping down the annulus could be a challenge depending on the wellhead seals for the casing.

Normally the barrier for a casing string needs to be at the bottom of the casing. Weakest point in the next hole section is generally the shoe. Not sure how you ensure good cement around the shoe when reversing.

Why not use a stinger to cement the shoe and then bullhead cement down the annulus to the loss zone. Run some petal baskets on the casing above the loss zone to support the cement that gets pumped in from above.
Posted by

Hari ekn

engineer

Transocean

Total Posts: 17
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