Holistic Bit-Rock-BHA Analysis Leading To Drilling Slant Section In Reservoir As Planned

By: Florent COULIOU

Context
“It is against our company policy to run full gauge near-bit-stabilizer (FG NBS).” Does that sound familiar to you?
Such was the reply by the directional drilling service provider concerning their new BHA proposal. It was for the slant section in the reservoir for the next producer in the deepwater asset of our client in West Africa.

A new BHA proposal was called for because the original proposal, —which was composed of a primary rotary BHA and a backup RSS (rotary steerable system) BHA, —did not work out on the last wells. Neither BHA was able to deliver a straight hole at 65 deg inclination. It had cost the Operator several millions of dollars for the additional tripping, without even considering the negative impact on the completion run and production.

DrillScan used its unique Rock+Bit+BHA Interaction model in the following workflow :

  1. Step 1: Challenge BHA proposal from Directional Drilling Company
  2. Step 2: Propose an optimised BHA & Bit design
  3. Step 3: Drill the section and validate the optimised BHA design with field data

Results
Results not only showed that the BHA was able to maintain the required inclination for the whole run but that the borehole was perfectly in-gauge, highlighting smooth drilling conditions, free of shocks & vibrations.
This has the extra benefits of:
– reducing bore-hole tortuosity;
– mitigating bit wear;
– preventing MWD/LWD failures;
-facilitating the next RIH operation of the production liner.

The reservoir section turned-out to have been drilled in the best quality and most cost-effective manner on this asset.

To find out what happened and how we helped our client to improve their BHA design, read our white paper by leaving your contact below. We will share our success and failure stories on a monthly basis, so that you can get valuable insights for your well project.

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