..., the final barrier solution will vary from well to well. A key principle for any barrier is that it extends cross-sectionally through the borehole, i.e. a "formation-to-formation" barrier. If cement is used as the sealing material in the barrier, the two usual options are a) a cross-sectional cement plug...

... For the 13⅜-in. casing, a minimum of 50 m of hydraulically sealing cement above the sand was needed. This condition would be confirmed with the job performance. For the 9⅝-in. liner, 30-m MD of bonded cement above the sand formation was needed, and this was to be confirmed by logging...

... wells via through tubing cementing methods for decades which has resulted in significant progress in the understanding of the applicability of the methodology and commensurate development of suitable technologies to deliver reliable long-term isolation. This paper will present the latest on selection...

... for conventional cementing operations. The log data provide information of annulus material with a detailed map of the axial and azimuthal variations of the annulus contents. Crossplotting state-of-the-art measurements also helps to identify the material accumulating in the annulus as published in many other...

... Abstract A major challenge that is being occasionally faced during the well construction phase is to cement the formations holding narrow pressure margins between the pore and fracture gradients without inducing losses. Losses can commonly occur in these cases, compromising the integrity...

... Abstract The cement barrier represents the first line of defense to maintain well integrity on a multimillion-dollar asset, and an integral barrier for stage isolation for completion expenditures. The actual cement slurry design parameters are often based on historical precedent, trial...

... Regulations in the areas relevant to this case history call for cement to the surface on the first two or three strings of casings. Conventional circulation of cement becomes increasingly difficult as measured depth (MD) and true vertical depth (TVD) increase. As openhole exposure increases...

...-in. outside diameter (OD) window. Despite never having performed an installation in this size of expandable liner, the provider had a run history for exits with similar modifications and extra trips to enlarge and elongate windows. Job challenges included thin-wall, channeled cement; limited flow rates...

... for the project to achieve top performance results and become one of the fastest exploration wells drilled in the Norwegian basin. This solution reduced uncertainties related to the conductor cementing, load and fatigue capacities, and deep surface casing cement. Improvement in the drilling performance...

... Abstract Ultrasonic and sonic logs are increasingly used to evaluate the quality of cement placement in the annulus behind the pipe and its potential to perform as a barrier. Wireline logs are carried out in widely varying conditions and attempt to evaluate a variety of cement formulations...

... Abstract North Sea lithologies are often complex creating a difficult environment to deliver effective zonal isolation with standard cementing practices. With ever-present weak, fractured, and unconsolidated formations, the practice of fully lifting heavier cement up the annular gap between...

... As wells are being drilled with more harsh enviroments and increased stresses such as drastic temperature and pressure changes throughout the life of a well, a more durable and self repairing cement was needed to be developed to lengthen the life of the well without the need of any remedial...

... Abstract Wells in the Montney Formation area, British Columbia, Canada, were designed as monobores and include surface and long lateral production casings. The decision to modify the openhole (OH) completion to a cemented sleeve system presented some concerns. A comprehensive data set from all...

...DrillWell Barrier Verification Project In 2013 and 2014, full-scale experiments were performed to investigate the sealing ability of annulus cement for a well plug and abandonment design where the tubing is left in hole (TLIH). The experimental configurations used 9 5/8-in. casing with a 7...

... As a part of the well permanent plug and abandonment, a surface barrier was planned installed at 222 m. This required the 9 5/8-in. and 13 3/8-in. casing to be removed to a sufficient depth. This operation has traditionally proven to be challenging and time consuming because the cemented 9 5/8...

... Cement characteristics necessary to decrease the likelihood of fluid migrating are clearly understood. However, in the DJ Basin, the cause of fluid migration is speculative. API Standard 65-2 provides only generalized, qualitative recommendations for related, testable parameters and solutions...

... Abstract Quality of cement is an integral part of well integrity. To ensure and improve cement quality, innovative polymers, based upon a family of polymers known as polyamides, are synthesized to improve the mechanical properties of Portland cement. This results in cement systems that have...

... The purpose of this experiment is to investigate the SNL tool response to acoustic signals generated by leakage through cemented tubing-casing annuli. The measurement resolution will be assessed at low flowrates of liquid and gas for different annular cement leakage scenarios. As the level...

... Abstract The annular casing cement is an important part of the well barrier throughout the life cycle of a well. With the increasing number of subsea plug and abandonment (P&A) operations, increased attention is now given to annular cement evaluation and the ability to prove adequate zonal...

... in Culberson County, Texas recently experienced total losses drilling four surface holes in a pair of neighboring pads located in bordering leases. Drilling into caves negatively affected operations by reducing the drilled footage per day, increasing fluid and cementing costs, and increasing the difficulty...