SPE/IADC 92568 M anaging pressures during underbalanced cementing by chok ing the return flow; innovative design and operational modeling as well as operational lessons and Rolv Rommetveit, SPE, SINTEF Petroleum Research fax 01 -97 2-952-9435.
AbstractThis paper describes operational lessons and the uniq ue simulation model developed for an underbalanced primary cementing of a 7 inch liner at the Gullfaks field in the N orth Sea.D ue to very small margins it was desirable to avoid pressure changes in the open hole section while circulating the cement. This was obtained by circulating fluids out through a choke that was accurately regulated to maintain constant bottom hole pressure throughout the circulation phase. The fluids in front and after the cement had relatively low density to compensate for the high density of the cement, and choke regulation was crucial before the cement was in place.The paper describes the operation in detail with special focus on any unexpected events. Measured and predicted pressure curves will be shown, and be analyz ed to come up with recommendations on how to carry out similar operations and how to best carry the technology further.A new transient computer model for cement displacement with dynamic choke regulation has been developed to make it possible to design choke operations accurately.The results of this paper have applications in any cementing operation where managing bottomhole pressure with a choke is req uired. The model can be applied in any such operation.The paper illustrates how to use managed pressure drilling ideas when cementing a well with very narrow pressure margins. The work is considered to be the first step towards managing cementing in combination with managed pressure drilling.
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