Rig Site Tips: Inner String Cementing Procedures and Instructions


Protecting the surface formations is very important to avoid facing any problems when drilling ahead to reservoir. The surface casing is cemented following a special procedure. It is cemented using the stinger which is made up on drill pipe and run to the surface casing shoe. The success of the operation is related to many points which have to be guaranteed before, during and after performing the cementing job.

Before the cementing job, the casing has to be checked, cleaned, measured and drifted. The casing tally has to be prepared (Click Here for General Running Procedure). The setting depth has to be discussed with well site geologist to give the window where the casing shoe should be set. The casing running equipment should be on site, also the cementing crew, unit and products should be on site. The jet cellar or electrical pump should deliver a pumping rate equals or more than the expected cementing flow rate. It has to be checked and tested before starting drilling the surface section. 

Once the setting depth is reached, the well should be prepared to run surface casing. The drilling mud should be conditioned. The driller has to get instructions to work on any tight spot faced when pulling out of the hole (Click Here for Tripping Instructions). When the drill bit is on surface, it should be cleaned and dull graded, then the rig floor should be prepared to rig up casing running equipment. 

Prior to run the first joint of casing, the bell nipple should be removed and the top of the conductor pipe should be cut to cellar ground level (this is an option, you can keep it as it is and cut it after finishing the cementing job). Once these preparations are established, the crew proceed to run the surface casing to the shoe setting depth. The landing joint should not screwed with the full required make up torque to make it easy to remove it.

Fig 01 - Surface Casing Before and After Removing the Landing Joint
When getting the shoe at the setting depth (at least the last two joints should be run with circulation to avoid plugging the casing shoe) the IPN beams should be prepared with a second side door elevator. The coupling of the last join should be landed on the IPN beams and side door elevator and centralized into the conductor pipe using chains, then the welder proceed to weld three bars of steel around the surface casing and anchor it at the conductor pipe in triangle form. After anchoring the surface casing string, the landing joint can be removed smoothly in order to avoid decentralize the surface casing, then rig down the casing running equipment.

Fig 02- IPN 
 In order to make sure that the stinger do the job properly, the sealing adapter and thread should be checked, also the stinger has to be tested into the stab-in shoe. Make up and run in the hole with centralized stinger, pup joints should be prepared to use them when spacing out. Establish circulation above stab-in shoe, then Stab into the shoe and slack-off. Establish circulation for 120 % of the drill pipe string volume. Check and make sure that there is no flow between the drill pipe string and the surface casing. The mud should flow between the conductor pipe and the surface casing. If no losses are recorded and the mud is flowing normally between the surface casing and the conductor pipe, the crew line up and switch to the cementing unit and pump volumes as cementing programs. While pumping lead cement and get it at the surface, the cement crew proceed to pump the tail cement without waiting to finish the total lead volume because it can be overestimated due to the level of excess factor used in calculations.
Fig 03- Stinger 
When getting cement at the surface, it is better to use a hose of water in the cellar to dilute the cement and make it easy to the jet cellar and the electric pump to work effectively. 

When the total volume of cement is pumped, pick up and un-stab the stinger and watch for any back flow. If any back flow is noticed stab-in and hold for fifteen minutes or more according to the cement surface sampling, then un-stab again, no back flow should be noticed due the cement gelling process (Click Here for Cement Properties). Pull out one joint drill pipe and circulate with fresh water to clean the inner drill pipe string from cement, then start to pull out the stinger to surface. 

Once stinger is at surface, proceed to remove the IPN beams and side door elevator then cut and bevel the surface casing in order to install the casing head housing and nipple up the blow out preventer (BOP). 
Fig 04- Casing Head Housing


Subscribe to receive free email updates:

Delivered by FeedBurner

27 Responses to "Rig Site Tips: Inner String Cementing Procedures and Instructions "

  1. Hello! I'm at work browsing your blog from my new iphone 4!
    Just wanted to say I love reading your blog and look forward to all your posts!
    Keep up the fantastic work!

    ReplyDelete
    Replies
    1. Really happy to receive your feedback, thank you.

      Delete
  2. Greetings! Very useful advice in this particular post!
    It's the little changes that will make the most important changes.
    Many thanks for sharing!

    ReplyDelete
  3. I wanted to visit and allow you to know how
    really I loved discovering your web blog today.
    I might consider it a honor to work at my office and be able
    to make real use of the tips discussed on your web-site and also engage
    in visitors' reviews like this. Should a position associated with
    guest article writer become on offer at your end,
    remember to let me know.

    ReplyDelete
  4. Thanks for finally writing about >"Rig Site Tips: Inner String Cementing Procedures and Instructions" <Liked it!

    ReplyDelete
  5. Great post, I think people should acquire a lot from this blog its very user friendly.
    So much superb info on here :D.

    ReplyDelete
  6. each time i used to read smaller content that also clear their motive, and that is also happening with this post which
    I am reading at this time.

    ReplyDelete
  7. Ahaa, its nice discussion about this article at this place at this website,
    I have read all that, so now me also commenting at this place.

    ReplyDelete
  8. Right here is the right blog for anybody who hopes to understand this topic.
    You realize so much its almost tough to argue with you (not that
    I personally would want to?HaHa). You definitely put a new spin on a subject that has been discussed
    for many years. Excellent stuff, just excellent!

    ReplyDelete
  9. Awsome blog! I am loving it!! Will come back
    again. I am bookmarking your feeds also

    ReplyDelete
  10. I really like it when people get together and share views.
    Great website, keep it up!

    ReplyDelete
  11. Thank you all of you for supporting us. All these comments help us to know that we are at the right path. Thank you again

    ReplyDelete
  12. Hello my friend! I wish to say that this article
    is awesome, great written and come with approximately all important infos.
    I would like to see more posts like this .

    ReplyDelete
  13. Very good article! We will be linking to
    this great post on our website. Keep up the great writing.

    ReplyDelete
  14. Utterly composed content material, thanks for selective information.

    ReplyDelete
  15. Informative article, just what I needed.

    ReplyDelete
  16. This is a brilliant post I seen on account of offer it. It is truly what I needed to see seek in future you will proceed after sharing such a fantastic post.
    Big Cut Sawing & Drilling

    ReplyDelete
  17. Appreciate this post. Let me try it out.

    ReplyDelete
  18. Spot on with this write-up, I seriously believe this site needs
    a lot more attention. I'll probably be returning to read more, thanks for the advice!

    ReplyDelete
  19. I do accept as true with all the ideas you've introduced for your post.
    They're really convincing and can definitely work.
    Nonetheless, the posts are too short for beginners.
    Could you please prolong them a little from next time? Thank you for the post.

    ReplyDelete
  20. What a stuff of un-ambiguity and preserveness of precious knowledge regarding unpredicted feelings.

    ReplyDelete
  21. I like this post, enjoyed this one thank you for putting up.

    ReplyDelete
  22. It's difficult to find knowledgeable people on this subject, however, you seem
    like you know what you're talking about! Thanks

    ReplyDelete
  23. This site was... how do I say it? Relevant!! Finally I've found something which helped me.
    Thanks!

    ReplyDelete
  24. Thanks very nice blog!

    ReplyDelete
  25. Hi, of course this post is in fact fastidious and I
    have learned lot of things from it regarding blogging.

    thanks.

    ReplyDelete